tag:blogger.com,1999:blog-35933688868635965052024-03-28T01:22:38.704-04:00beoloverBeolover provides professional Bang&Olufsen maintenance and restoration services. We give one year warranty on parts and labor. All parts featured on the blog are also available to other enthusiasts for their restoration projects. Please, send an email to beolover@gmail.com or use the contact form on the side bar. Enjoy the blog!beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.comBlogger1393125tag:blogger.com,1999:blog-3593368886863596505.post-45189585485734969802024-03-20T14:01:00.003-04:002024-03-20T14:01:48.922-04:00Beolover SyncDrive: DC Platter Motor Replacement for Beogram 4002 and 4004 (Type 551x and 552x)<p style="text-align: justify;">Late Beogram 4002 and the 4004 (Types 551x and 552x), which have DC platter motors instead of the earlier synchronous AC motors usually suffer from dry motor bearings and/or bad spark snubbers. This often causes very noticeable RPM variations that ruin the listening experience. These motors can be restored by oil-infusing under vacuum, but even when restored, they do not measure up to the original AC platter motors or the later linear drives in the Beogram 8000 and 8002. Often there is significant RPM drift due to temperature variations and other environmental influences, and the analog feedback-based RPM control circuit causes fairly strong wow and flutter compared to the AC-motor Types and the 8000 series.</p><div style="text-align: justify;">Once I realized the relative inferiority of the DC drive a few years ago (and also being slightly annoyed by restoring one DC platter motor after another..;-), I started working on an adequate replacement for these motors. I desired an upgrade for DC Type Beograms that would make them as good as the other models. This took me on a long and pretty interesting journey exploring different motor types and control approaches.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">I finally settled on a brushless three-phase motor. The motor in the final design is custom manufactured for best performance and it is synchronously driven. The control system is able to measure the actual RPM of the platter, which enabled an auto-calibration feature that allows precise RPM adjustment.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">I made a (rather long...sorry!...;-) video that explains the in and outs of the SyncDrive, demonstrates installation, use and gives a discussion of its performance relative to the other Beograms of the day. Enjoy:
</div><div class="separator" style="clear: both; text-align: justify;"><br /></div><div style="text-align: justify;"><iframe allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/bKZv_xZN1o0?list=PLESEm7IGo1cByvOVx5XbHXXOm-DrLlCvV&rel=0" width="560"></iframe>
</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">The SyncDrive is available via the <a href="https://beolover.com/products/beolover-syncdrive-dc-motor-replacement-for-beogram-4002-and-4004" target="_blank">Beolover Store</a>. Send an email to beolover@gmail.com if you are interested/have questions.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">If you rather read than watch: Here is a short summary of the most important aspects:</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">The SyncDrive is an easy plug-and-play installation without the need for soldering (see video below). This is how the SyncDrive looks installed in lieu of the original motor:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7GJLIJei1rWwApnz9YPJhEQzAVA-4hsZfe473gAayi0GH0WSimku5ORGyaCMu6YrgeffSwutGPIx_lqdVmLSb0JfTYrBf-2XHOtgrkD1JwitD_Y0jiBdaa9fttMeMQ3lIKr2xxbv25IfRCjjeY9wekzPTzwUm4aK_ezV4BQWBMr-SocvWEd4eb5lxy0A/s1200/1%20SyncDrive.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="673" data-original-width="1200" height="358" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7GJLIJei1rWwApnz9YPJhEQzAVA-4hsZfe473gAayi0GH0WSimku5ORGyaCMu6YrgeffSwutGPIx_lqdVmLSb0JfTYrBf-2XHOtgrkD1JwitD_Y0jiBdaa9fttMeMQ3lIKr2xxbv25IfRCjjeY9wekzPTzwUm4aK_ezV4BQWBMr-SocvWEd4eb5lxy0A/w640-h358/1%20SyncDrive.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">The board bolts directly to the mounting posts of the original DC motor, and the electrical connections are made by a single wire harness that connects to the main board:</div><div style="text-align: justify;"><br /></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhSfyGSw9txGgLnAQEzbJdVTzF-RfbjO-MnyL2vX-tE-2DmELYz8VvcgfAJNKidKn_bJxkQJW4UprxVyKloNylKWo00kjy-qeQk6zV8z3Pjkwp5LVdi4D9Pe4vFlUvx7UN_avOOAz4fC-x0BxBqkR-7oIHG1egSzS958PokGqIz7PHFH690YIOTBbghP-c/s1200/2%20Beolover%20SyncDrive%20DC%20motor%20replacement%20for%20Beogram%204002%20and%204004.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1200" data-original-width="1200" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhSfyGSw9txGgLnAQEzbJdVTzF-RfbjO-MnyL2vX-tE-2DmELYz8VvcgfAJNKidKn_bJxkQJW4UprxVyKloNylKWo00kjy-qeQk6zV8z3Pjkwp5LVdi4D9Pe4vFlUvx7UN_avOOAz4fC-x0BxBqkR-7oIHG1egSzS958PokGqIz7PHFH690YIOTBbghP-c/w640-h640/2%20Beolover%20SyncDrive%20DC%20motor%20replacement%20for%20Beogram%204002%20and%204004.jpg" width="640" /></a></div><div style="text-align: justify;">This picture indicates the essential features of the SyncDrive:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBlyGfAVZiCe_wRgDp7kmQ1mSJ3hBSzI10yUkdPO45tmgtCYXWOvc80EgR0zt5sCv2z2y9IW_dAb0NDNn8nH91pCxep2RLAO5ZsjgqutnNbS8FpBogINWryiE0WiTeiNXdaK5KXSJR2p6kMBIXNYjX-7-wV1Q-Ety2eGvJ8xACXaI1uvzrSQV19_AzAXU/s1200/3%20Beolover%20SyncDrive%20DC%20motor%20replacement%20for%20Beogram%204002%20and%204004.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1200" data-original-width="1200" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBlyGfAVZiCe_wRgDp7kmQ1mSJ3hBSzI10yUkdPO45tmgtCYXWOvc80EgR0zt5sCv2z2y9IW_dAb0NDNn8nH91pCxep2RLAO5ZsjgqutnNbS8FpBogINWryiE0WiTeiNXdaK5KXSJR2p6kMBIXNYjX-7-wV1Q-Ety2eGvJ8xACXaI1uvzrSQV19_AzAXU/w640-h640/3%20Beolover%20SyncDrive%20DC%20motor%20replacement%20for%20Beogram%204002%20and%204004.jpg" width="640" /></a></div><div style="text-align: justify;">The speed sensor measures the platter speed from below, using the platter ribs in the same way the BeoloverRPM device uses them from above.</div><div style="text-align: justify;">The user interface is activated by pressing any of the four buttons while the platter rotates. Once pressed, the indicator LEDs come alive and the interface is ready to interact. The buttons allow automatic calibration of the RPM and manual adjustment (33 and 45 are independently adjusted/calibrated depending on the actually selected RPM of the Beogram). Furthermore, the influence of the RPM panel above the keypad can be deactivated if desired. This can be useful if there are issues with the potentiometers in this panel, or if accidental RPM change is to be prevented.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">I characterized the performance of the SyncDrive using the <a href="https://beolover.blogspot.com/p/beoloverrpm-precise-rpm-measurements.html" target="_blank">BeoloverRPM device</a>, which allows precise RPM measurements and log them over time. </div><div style="text-align: justify;">This shows a direct wow and flutter comparison between a restored DC-motor and the SyncDrive:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgVHPiiAfKwgedsp-w2LZ6MifEKOhGJBaCXvme0SuQK4TW-6vXab_3N61YYUizL-qj0qVb1kuQxKEmPimRyklypW6GKDcBWVa3RYMcG0CMHpefTMGBO-qBp87K58LuOQ8Sgzsty6dmoh4BZkW6ePpLbjA6LzfaYgBpmDArOKLEwLEQDpEdrpljQg2ox3sg/s1329/For%20Video%20sync%20vs%20original%20fast%20mode.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="776" data-original-width="1329" height="374" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgVHPiiAfKwgedsp-w2LZ6MifEKOhGJBaCXvme0SuQK4TW-6vXab_3N61YYUizL-qj0qVb1kuQxKEmPimRyklypW6GKDcBWVa3RYMcG0CMHpefTMGBO-qBp87K58LuOQ8Sgzsty6dmoh4BZkW6ePpLbjA6LzfaYgBpmDArOKLEwLEQDpEdrpljQg2ox3sg/w640-h374/For%20Video%20sync%20vs%20original%20fast%20mode.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">The measurement covers about 60 turns of the platter. The 'noise' in these spectra is caused by small variations of the spacing between the platter ribs. Since the BeoloverRPM device measures the time between the passing of ribs under its sensor, slight variations of the spacing introduce a measurement artifact. The two shown measurements were performed in the same Beogram with the same platter, i.e. have the exact same platter pattern. This allows a direct comparison. The red curve was measured with the SyncDrive installed, while the blue curve was measured with a restored original DC motor. The 'beating' pattern of the blue curve is an indication of the analog control system acting to keep the RPM constant. In essence, the RPM of the original motor 'meanders' around the 33.33 set point in an attempt to stay close. All feedback based control systems operate that way: The actual RPM is compared with the setpoint, and when the RPM is too low, the motor speeds up until it is measured too high, then the process reverses. This causes a wavy trajectory of the actual RPM around the set RPM. The art of feedback systems is basically to keep such variations at a minimum. The analog control system of the 4002 does a pretty decent job, but it is no match for the precision of synchronous motors, which do not rely on feedback, but rather on a very stable oscillator that determines the RPM top-down, and the motor simply 'obeys'. Precise oscillations can be generated with high accuracy, which makes such motors superior as platter motors.</div><div class="separator" style="clear: both; text-align: justify;"><br /></div><div class="separator" style="clear: both; text-align: justify;">This can be clearly seen when comparing the performance of the earlier AC platter motors found in Beogram 4002 550x Types and the original 4000. This graph shows the above two curves in comparison with a curve measured on a restored Beogram 4000, as well as the later 8000 and 8002 types:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjvjweE_fm7LxrL_A94B67a0weAdXqXwgsTGS_pcG7bSGA5imMrsdExf2AuYeXciXLJvbRx4mWvDQa1LXyLm1FyDE-KrengHm-QYVer4PyrhdHigzIj8h7XXZivK7S5EsEOY5_5XUeaPdd6IPUYLl2nBAAOLE4qgVI6lvvpaF5iWGl-RBHYColU3m5JAiI/s1434/For%20Video.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="840" data-original-width="1434" height="374" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjvjweE_fm7LxrL_A94B67a0weAdXqXwgsTGS_pcG7bSGA5imMrsdExf2AuYeXciXLJvbRx4mWvDQa1LXyLm1FyDE-KrengHm-QYVer4PyrhdHigzIj8h7XXZivK7S5EsEOY5_5XUeaPdd6IPUYLl2nBAAOLE4qgVI6lvvpaF5iWGl-RBHYColU3m5JAiI/w640-h374/For%20Video.jpg" width="640" /></a></div><div style="text-align: justify;"><br /></div><div class="separator" style="clear: both; text-align: justify;"><br /></div><div style="text-align: justify;">The pink curve was measured on the 4000. It is clear that the performance is much better than the DC motor, which is a direct result of the synchronous operation of the can stack AC motor of the 4000, which is driven by an analog Wien precision oscillator. The slight waviness of the curve is most likely the result of the elastic coupling between the motor pulley and the platter causing a weak 'jo-jo effect'.</div><div style="text-align: justify;">It is interesting to compare the performance of the belt drives with the later linear motors of the Beogram 8000 and 8002. Sonavor kindly contributed the green curves when I sent him the redesigned BeoloverRPM for testing. The overall RPM stability seems very similar to the 4000 and the SyncDrive. This is interesting since the linear drive in the 800x is a feedback based system. Here we see that feedback does not need to be bad if it is well designed. The linear drive benefits from the absence of a belt, which takes the elastic coupling out of the equation. A digital control system coupled with high-resolution feedback from an ~80 slots tacho disk seems to be sufficient for a fairly precise control that is much better than what was achieved with the analog control of DC motors. It is interesting to compare the two green curves: The much smoother 'platter pattern' of the 8002 is a result of its different platter design: The earlier 8000 still used a 4002 style platter, and consequently its platter pattern is similar to the measurements on the 400x. The (likely) etched platter of the 8002 seems to have more smoothly varying spacings between the platter ribs. I do not know how they really made these platters, but the smooth variations suggest a projection aberration during pattern generation for the etching process.</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">It is satisfying to see that the SyncDrive is matching up fairly well with the early 4000 and the later 800x.</div><div style="text-align: justify;">When it comes to long-term stability the SyncDrive is actually better than the early 4000:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0M6xgTMnCUmd0JWvt0_s3t4Ld4sxW1K8pB4bLF_yOfvaezloNadIMATSbevvs-Sp9CelGXOwpudD5S1z0Za95xkxdh5XMeEmGon5hBcDyYzoqr0lT2AhdQnTFsgmwHsZT8l5QpgP4oDos-7dNGZMereM0hOcwJNkOqD9w3JFtnepU3ri18wjjyomD2kE/s1433/Longterm24hrsRPMcomparison.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="835" data-original-width="1433" height="372" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0M6xgTMnCUmd0JWvt0_s3t4Ld4sxW1K8pB4bLF_yOfvaezloNadIMATSbevvs-Sp9CelGXOwpudD5S1z0Za95xkxdh5XMeEmGon5hBcDyYzoqr0lT2AhdQnTFsgmwHsZT8l5QpgP4oDos-7dNGZMereM0hOcwJNkOqD9w3JFtnepU3ri18wjjyomD2kE/w640-h372/Longterm24hrsRPMcomparison.jpg" width="640" /></a></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">While the 4000 has a much better wow and flutter than the DC motor 4002, it has similarly strong longterm RPM drift. This is not a surprise, since its Wien oscillator is analog, and therefore also more easily affected by temperature variations. The SyncDrive compares favorably with a much smaller drift, courtesy of its digital control system. Unfortunately, we were not able to perform such measurements on Beogram 8000 and 8002s (yet!...;-). They shut down after 30 min if they recognize that no record is being played. I suspect that their RPM stability is also pretty good due to their digital control system.</div><div style="text-align: justify;"><br /></div><div><div style="text-align: justify;">In summary, I think the SyncDrive turned out to be a nice upgrade for any DC-motor Beogram, bringing them to AC-motor Beogram level (and likely even 8000 and 8002 level in terms of RPM stability).</div><div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div></div></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-90012071282365051212024-03-12T11:51:00.003-04:002024-03-12T11:51:43.235-04:00Beogram 5500 Type 5943: Operational Again<p>This Beogram 5500 turntable is playing records again. I connected it to its Beomaster 5500 unit and fitted it with an MMC-2 phono cartridge.</p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj-Xmty2Jc43TMki5rwDLVlapohY0BTfi9nGvJ0UxJE177vvOjXny7FADyrDBilHjQ01mI6RCMLRQPLLVSrbXxuuMkV3rlc2d0lEIn8Ac7uakduSkn__lXr4xtvcAaW8GUMTLkmPR-Noug-6xm-BmXJJbQ88F1AX3s4L8m9Xpst5MvL0Eetm9k2mPoZN5NH/s2200/bg5500_5943_kt_listening_test_02.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj-Xmty2Jc43TMki5rwDLVlapohY0BTfi9nGvJ0UxJE177vvOjXny7FADyrDBilHjQ01mI6RCMLRQPLLVSrbXxuuMkV3rlc2d0lEIn8Ac7uakduSkn__lXr4xtvcAaW8GUMTLkmPR-Noug-6xm-BmXJJbQ88F1AX3s4L8m9Xpst5MvL0Eetm9k2mPoZN5NH/w640-h480/bg5500_5943_kt_listening_test_02.jpg" width="640" /></a></div><br /><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /></p><div>The Beogram sounds great and the remote control functionality with the Beomaster works perfect.<br />These Beosystem 5500 components are ready to return home to their owner.<br /><br />To get to this point from the <a href="https://beolover.blogspot.com/2024/03/beogram-5500-type-5943-replacing.html" target="_blank">previous post</a> I had to go through the Beogram 5500 service manual adjustments.<br /><br />The set down point and the platter speeds were the only adjustments that were out of range on this turntable. However, there was a problem with the platter motor making an audible racket as it turned.<br />The sound is similar to Beogram 4002/4004 platter motors as they age and their oilite bearings dry out.</div><div>I am not setup to re-infuse the bearings right now the way Beolover restores the Beogram 4002/4004 motors. I will save this motor for restoration later and in the meantime use a spare Beogram 5500 platter motor.</div><div><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZ4JA08ooyprsyBvETgpL3hqkJGWeQhr2b_-EK9zixfQS-T2eGeJ4DKBGDx3KrplRWh5Wu2uM5JlR8skis7TGdxVp071C3_y_Wg2c6dVJ8UfLXY3h9gxUAi_MI06FnPiDTvkuWQ_DA36AnhYuTHKq_X3DEm4k3S1PZ55tf-pN427KvVVzj8909w7pm_aDF/s2200/bg5500_5943_kt_platter_motor_01.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1397" data-original-width="2200" height="406" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZ4JA08ooyprsyBvETgpL3hqkJGWeQhr2b_-EK9zixfQS-T2eGeJ4DKBGDx3KrplRWh5Wu2uM5JlR8skis7TGdxVp071C3_y_Wg2c6dVJ8UfLXY3h9gxUAi_MI06FnPiDTvkuWQ_DA36AnhYuTHKq_X3DEm4k3S1PZ55tf-pN427KvVVzj8909w7pm_aDF/w640-h406/bg5500_5943_kt_platter_motor_01.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><div class="separator" style="clear: both; text-align: center;"><br /></div></div><div>Bang & Olufsen used this same 12VDC MMX-4H2RPB motor as the platter motor for a number of their turntables. Both tangential arm and radial arm turntables from around 1984 and on. <br /><br />The replacement motor is nice and quiet so the platter rotates silently now.<br /><br />For the speed adjustments there are two trimmer resistors on the Beogram 5500 controller board.</div><div><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0zw2SIqz-FURjdU39Hg8Kw9ygg0r9TQDPRTuMkAlYd7en18Rq3iTrcjHgJT5tMEb2urgCGApPsvwjjVPAeQnJuyL3TckDSyJYHMqYpzAp7CaGJX0gKUy3BMx-GxLUNjiFQW1zttyAxH1ul_OFEYU31vHDo6QldSUQRzX0r6RTLrV8Fu8BsilNHs7leXDs/s2200/bg5500_5943_kt_33RPM_45RPM_platter_speed_01.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0zw2SIqz-FURjdU39Hg8Kw9ygg0r9TQDPRTuMkAlYd7en18Rq3iTrcjHgJT5tMEb2urgCGApPsvwjjVPAeQnJuyL3TckDSyJYHMqYpzAp7CaGJX0gKUy3BMx-GxLUNjiFQW1zttyAxH1ul_OFEYU31vHDo6QldSUQRzX0r6RTLrV8Fu8BsilNHs7leXDs/w640-h480/bg5500_5943_kt_33RPM_45RPM_platter_speed_01.jpg" width="640" /></a></div><br /><div><br /></div><div><br /><br /></div><div class="separator" style="clear: both; text-align: center;"><br /></div><div>To check the speed setting I used the new <a href="https://beolover.blogspot.com/p/beoloverrpm-precise-rpm-measurements.html" target="_blank">Beolover RPM tool</a>.<br />In order to put the Beogram 5500 into record play mode so I could measure the platter speeds I placed a 45 RPM record on the platter then paused record play. The 45 RPM record leaves the edges of the platter with the markings exposed for the Beolover RPM tool to measure with.</div><div><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhacdlsZVUMDcllfy2bRZzYC9P4SRAIqRzMWZv2hmYr_6I9Fw6-SXVdHj9CEXxBWnuCfgfdHwRedoR0C_pb5tNFdVY_wW7AGW32xpHRGkpt1U57NKjxJDdNcDGFZ0oQ1gu8YHBkfFsUh_s0Nmo7jWAj7ksxLZgY82_SJk7r1MPnUTqJ0E9WMatstTpdXRTK/s2200/bg5500_5943_kt_33RPM_platter_speed_02.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhacdlsZVUMDcllfy2bRZzYC9P4SRAIqRzMWZv2hmYr_6I9Fw6-SXVdHj9CEXxBWnuCfgfdHwRedoR0C_pb5tNFdVY_wW7AGW32xpHRGkpt1U57NKjxJDdNcDGFZ0oQ1gu8YHBkfFsUh_s0Nmo7jWAj7ksxLZgY82_SJk7r1MPnUTqJ0E9WMatstTpdXRTK/w640-h480/bg5500_5943_kt_33RPM_platter_speed_02.jpg" width="640" /></a></div><br /><div><br /></div><div><br /><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgG5npkl53mmIyrwCt22AOzL9ONqTt0vundl9JpmENpO1fPQjc-WFa-6FkzRTybqJG3bup5Lf-qFSmAwlPR4TsO1E-ekGPL5bDeyuw_NGHMfYJRiISn4vwKZHzc1_k9C-20wt8Xejhi0BZ1gw4WVh8oYMvlR15HHsdJLbeOlzE7Ctwmwogpgq_9bWzfZyZo/s2200/bg5500_5943_kt_45RPM_platter_speed_03.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgG5npkl53mmIyrwCt22AOzL9ONqTt0vundl9JpmENpO1fPQjc-WFa-6FkzRTybqJG3bup5Lf-qFSmAwlPR4TsO1E-ekGPL5bDeyuw_NGHMfYJRiISn4vwKZHzc1_k9C-20wt8Xejhi0BZ1gw4WVh8oYMvlR15HHsdJLbeOlzE7Ctwmwogpgq_9bWzfZyZo/w640-h480/bg5500_5943_kt_45RPM_platter_speed_03.jpg" width="640" /></a></div><br /><div class="separator" style="clear: both; text-align: center;"><br /></div><div>The tonearm set down point for record sizes 17 cm (~7 inch) and 30 cm (~12 inch) were initially off the mark on this Beogram. </div><div><br /></div><div>The service manual specifies that the 17 cm set down point should be adjusted first, then the 30 cm set down point.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5ZLLNM-wlj3Cfcz4FZvDWV1hplsmhh-SGypa2t_ueh2aVMQCM2-9u0NfYLrvcVg5c-yeEAm_Rit08KgEQBMbruq0EMZHMFcdYCEXsaJowUSMYbg59pkcEIP5rX6mQoTu3juZaGRxPml4pK8_l5m9hIOP8g1Uq3bpKiOk_M_eXdrQ7IAtsFMnThOoMWXC8/s2200/bg5500_5943_kt_17cm_and_30cm_setdown_points_04.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5ZLLNM-wlj3Cfcz4FZvDWV1hplsmhh-SGypa2t_ueh2aVMQCM2-9u0NfYLrvcVg5c-yeEAm_Rit08KgEQBMbruq0EMZHMFcdYCEXsaJowUSMYbg59pkcEIP5rX6mQoTu3juZaGRxPml4pK8_l5m9hIOP8g1Uq3bpKiOk_M_eXdrQ7IAtsFMnThOoMWXC8/w640-h480/bg5500_5943_kt_17cm_and_30cm_setdown_points_04.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />For the 17 cm set down point adjustment there is a black, plastic eccentric disc that moves the set down position in or out as shown in the following picture. The disc can be rotated with a flat head screwdriver.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgC1UrNdl6BOKwc4Kgr7c7CIEQvCvMATjpE7w9jc_xebjSlmrFnue5BZsn-5G6TIWz_WG3JHvC20sdtFGSHVmjmorOoYONyWExoDAIzi_4ezW6quGKwHdP714KppVYlPCOrsuAYgNRj9tkm5Q8hW7XsIZa1IllEZwb7Hr9fsm52KdXWPq5rJPNpyqcwS2tF/s2200/bg5500_5943_kt_17cm_setdown_point_02.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgC1UrNdl6BOKwc4Kgr7c7CIEQvCvMATjpE7w9jc_xebjSlmrFnue5BZsn-5G6TIWz_WG3JHvC20sdtFGSHVmjmorOoYONyWExoDAIzi_4ezW6quGKwHdP714KppVYlPCOrsuAYgNRj9tkm5Q8hW7XsIZa1IllEZwb7Hr9fsm52KdXWPq5rJPNpyqcwS2tF/w640-h480/bg5500_5943_kt_17cm_setdown_point_02.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br /><br /><br /><br />For the 30 cm set down point adjustment there is a metal lever whose position is moved with a white, plastic (nylon) adjustment screw. After the position is moved, a locking screw is tightened to ensure the lever position doesn't change.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtJFbMJNUGfuqxZd6cMdhIESXC9PncbESy3VSsXpUDPygWdqvbWtJ-aPHpmTBHgBKmmmIwe-zTLIwIHY10dZB64IdFE8U5VJTgcIULlRGbGY2rHoZAkW36CwQp1nzAWvHhZyX6NCanAOFOhh-75Yie-VtdO_WMVV7rKchAl9CPlcGfZfTn_DkMnPU_S9a9/s2200/bg5500_5943_kt_30cm_setdown_point_03.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtJFbMJNUGfuqxZd6cMdhIESXC9PncbESy3VSsXpUDPygWdqvbWtJ-aPHpmTBHgBKmmmIwe-zTLIwIHY10dZB64IdFE8U5VJTgcIULlRGbGY2rHoZAkW36CwQp1nzAWvHhZyX6NCanAOFOhh-75Yie-VtdO_WMVV7rKchAl9CPlcGfZfTn_DkMnPU_S9a9/w640-h480/bg5500_5943_kt_30cm_setdown_point_03.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br />Here is the 30 cm set down point after the adjustment.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjliAmVz1iJHtWzCpEtQ91GpbnHAFav10MerB8L_3luscaiFT56t8rn1tmr16fOhFUf8qHwWFnF0yilQQKjEfqPGJ_jHzCmWgn50jwjhj2cgST544WWA6LJkllkc4hpV9itXewZp-wxopmvR_-ZM0PkYJo1TfTghkeBUHrHGhKMrZ9qZCUt47aiKBBqIjWT/s2200/bg5500_5903_kt_30cm_setdown_point_05.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjliAmVz1iJHtWzCpEtQ91GpbnHAFav10MerB8L_3luscaiFT56t8rn1tmr16fOhFUf8qHwWFnF0yilQQKjEfqPGJ_jHzCmWgn50jwjhj2cgST544WWA6LJkllkc4hpV9itXewZp-wxopmvR_-ZM0PkYJo1TfTghkeBUHrHGhKMrZ9qZCUt47aiKBBqIjWT/w640-h480/bg5500_5903_kt_30cm_setdown_point_05.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Although I didn't have to adjust the Beogram 5500 record tracking sensitivity it is worth noting that I checked it.<br />That adjustment appears more difficult on this type of Beogram than the Beogram 400x and 800x turntables. On those turntables it is easy to disable the platter motor function and move the arm to a test track where the arm is lowered. Once lowered, the platter is manually rotated to check the record tracking.<br /><br />On the Beogram 5500 while the platter drive can easily be disabled by removing the platter belt, manually getting the arm to a test track to test the sensing of the arm position seemed difficult.<br />Manual operating the platter to control the arm movement and set down are rather unclear.<br /><br />For this Beogram 5500 I put on a test record with the platter functional and observed the record tracking by viewing the servo motor advancement from the rear of the Beogram.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3sXOZUyCCmfOYkibCbHJz3TtJnooeqHLnIjRcXHMCmlRvcUq922TXuyf4ST2k9-4VX1qGtquNSt7DIEl3tTXARJN-8v8B8A6RayQIPRYDNzG6o9z7ILjYkCtk2kJ1icaRT2vrIQGRv8xU3RLbM1U_9c_wSalhG_Ri8KtvjrGLWC51mJBwETQ7S_SZFk5m/s2200/bg5500_5943_kt_record_tracking_01.jpg" imageanchor="1" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3sXOZUyCCmfOYkibCbHJz3TtJnooeqHLnIjRcXHMCmlRvcUq922TXuyf4ST2k9-4VX1qGtquNSt7DIEl3tTXARJN-8v8B8A6RayQIPRYDNzG6o9z7ILjYkCtk2kJ1icaRT2vrIQGRv8xU3RLbM1U_9c_wSalhG_Ri8KtvjrGLWC51mJBwETQ7S_SZFk5m/w640-h480/bg5500_5943_kt_record_tracking_01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />From this vantage point I was able to check platter revolutions with regard to the Servo Motor advancing the drive pulley.<br /><br />I could see that this Beogram Servo Motor started advancing the arm within 2 turns of the platter after the initial set down. That is setting down on a music track...not setting down on the lead in groove.<br />Once set down, the Servo Motor advanced the arm every revolution of the platter.<br /><br />The rest of the adjustments like the audio signal muting, arm alignments and suspension were all good so I was comfortable to install a good MMC-2 phono cartridge for the listening test.<br />sonavoraudiohttp://www.blogger.com/profile/04144547857529140916noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-41457147253294278712024-03-05T12:25:00.002-05:002024-03-05T12:25:13.385-05:00Beogram 4002 (5513): Full Restoration and a Test Spin with George Duke<p style="text-align: justify;">This post describes the restoration of a Beogram 4002 that I recently received from a customer in Texas. My initial assessment of the unit is posted <a href="https://beolover.blogspot.com/2024/02/beogram-4002-first-assessment.html" target="_blank">here</a>.</p><p style="text-align: justify;">This shows the unit with the aluminum panels removed. It was in original condition, a perfect starting point for a functional restoration:</p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhERua2fu1SLe9ekGcb5G7hW6Y0iHrgqSFDqFtnYIuC2sZt-Fgs02PbOEzHvP9B2btGpQryZyFHjY0-LBvQ-eYiBQv4W-GeTSC_X9wBHtlQRd8Rmcizr_Ek7yrivKTTX37md0t8kKxFVUeAhtIMWytp1tdddJDD6nqXCiNdMwTi1u4iLfff11hRWIqhYm0/s1200/1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhERua2fu1SLe9ekGcb5G7hW6Y0iHrgqSFDqFtnYIuC2sZt-Fgs02PbOEzHvP9B2btGpQryZyFHjY0-LBvQ-eYiBQv4W-GeTSC_X9wBHtlQRd8Rmcizr_Ek7yrivKTTX37md0t8kKxFVUeAhtIMWytp1tdddJDD6nqXCiNdMwTi1u4iLfff11hRWIqhYm0/w640-h480/1.jpg" width="640" /></a></div><div style="text-align: justify;">As usual, I started with the DC platter motor, they all need their Oilite bearings re-infused with oil. This shows the extracted motor:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_pC_86tH76Ccev9g3r9Gh-1xYokd6KTyVkUT-fLdoA7hvXfDflTHkVfcQD6kiFDUtxmN2_rHwNp44b3HycwGhQAcimXgZBmvvr2NpQY_tMsU1Nm4jYpm9zi8qf58pfZcMxGVxYvVwmNO1OTxOP_OcPUZ5lZfqPWywY7khwvofWUL32pg97WcdLvSpRPU/s1200/2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_pC_86tH76Ccev9g3r9Gh-1xYokd6KTyVkUT-fLdoA7hvXfDflTHkVfcQD6kiFDUtxmN2_rHwNp44b3HycwGhQAcimXgZBmvvr2NpQY_tMsU1Nm4jYpm9zi8qf58pfZcMxGVxYvVwmNO1OTxOP_OcPUZ5lZfqPWywY7khwvofWUL32pg97WcdLvSpRPU/w640-h480/2.jpg" width="640" /></a></div><div style="text-align: justify;">I disassembled it to get to the bearings. They are the two small donuts on the black pad upfront:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqi5_Go4nWUSwKbXLkc0Hx1yBKZEWvOSPmUov-G8vjS49Pog-xyu44NMboxElfYYNF0wFSVHNGO4oQzz3EXIvlqL18qytB121LlC9ncMCRLiqgK8aHZWRITdxy3xm9fjyw-9r3zZAS6BqE7ra87YcUHSWeuIUDGvx1uVMQs5rbEyoN9Ucmq-KcxN9wN1Q/s1200/3.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjqi5_Go4nWUSwKbXLkc0Hx1yBKZEWvOSPmUov-G8vjS49Pog-xyu44NMboxElfYYNF0wFSVHNGO4oQzz3EXIvlqL18qytB121LlC9ncMCRLiqgK8aHZWRITdxy3xm9fjyw-9r3zZAS6BqE7ra87YcUHSWeuIUDGvx1uVMQs5rbEyoN9Ucmq-KcxN9wN1Q/w640-h480/3.jpg" width="640" /></a></div><div style="text-align: justify;">I immersed them in oil and pulled a vacuum. Immediately strong bubbling started:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4Y5JqHK5lo0dp474R8C6amMQmbmk_qBEGwtzXIEiKuIZX8ZAKMRh_daFbk5oYnV6U0UzdDdKLRrssgjB4OH-P0CIHE2XA2rNVakgWwh3sLdBXm9UnYqTe00-WQIVzOcNdwgordOQSy_DFgNYSMxTL39AZNk8kjuiVI1Y-S7TxMqNU3O8Cu-8LUaUD490/s1200/4.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4Y5JqHK5lo0dp474R8C6amMQmbmk_qBEGwtzXIEiKuIZX8ZAKMRh_daFbk5oYnV6U0UzdDdKLRrssgjB4OH-P0CIHE2XA2rNVakgWwh3sLdBXm9UnYqTe00-WQIVzOcNdwgordOQSy_DFgNYSMxTL39AZNk8kjuiVI1Y-S7TxMqNU3O8Cu-8LUaUD490/w640-h480/4.jpg" width="640" /></a></div><div style="text-align: justify;">This bubbling is a sign that the vacuum draws the air from the empty porous bearing material. This makes room for fresh oil to diffuse into the material. Oilite bearings work by releasing minute amounts of oil from their pores onto the shaft while the motor is running. Unfortunately, this means that they have a finite life/runtime.</div><div style="text-align: justify;">The infusion process usually takes 2-3 days. In the meantime, I focused on the rest of the Beogram. </div><div><div style="text-align: justify;">The next step was the restoration of the mechanical carriage systems, the arm lowering mechanism and the components that allow moving the carriage itself. This shows all the parts still in place:</div><div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFsg0Wh_bmzShZAaWzHmiWwH8aJ7FGNr3jHHkLKi-_OcX4PtKGOVyi649X3MlMslM_ayy4f1Wt4ehIDL8qZ3VV8Ti89Ak3gJ7uDtNo45CeZ7I3Gjkz1PXjIc0fXefk_KeGvQkqpnL0oth_8ssfX3Y4JJN5YbbyXm23_4Jz8dYoXGrWh6_QB1rb9iLb_gs/s1200/5.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFsg0Wh_bmzShZAaWzHmiWwH8aJ7FGNr3jHHkLKi-_OcX4PtKGOVyi649X3MlMslM_ayy4f1Wt4ehIDL8qZ3VV8Ti89Ak3gJ7uDtNo45CeZ7I3Gjkz1PXjIc0fXefk_KeGvQkqpnL0oth_8ssfX3Y4JJN5YbbyXm23_4Jz8dYoXGrWh6_QB1rb9iLb_gs/w640-h480/5.jpg" width="640" /></a></div><div style="text-align: justify;">I took everything apart. It is a good idea to rest the carriage on a soft support pad while the rods and spindle are removed to protect the fragile wiring on the bottom of the assembly:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJHMyFRlHQwoQmAARKAiWEkggsx6vRFgIBG32Lwjan6_Cn74w8nfGpA6RJ6jatklFnwJl8Rrg7_rGdxD1xnGAhEq-RpCi8fNT-iQ4A3Z7TGpia_L2414Zo-WtcqfgLq9GjZs3O3ZsTDdN5oQmU1gRTud9rRo1z86053iuP3Xd6PXl6njfDx7IDXcyVVBI/s1200/6.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJHMyFRlHQwoQmAARKAiWEkggsx6vRFgIBG32Lwjan6_Cn74w8nfGpA6RJ6jatklFnwJl8Rrg7_rGdxD1xnGAhEq-RpCi8fNT-iQ4A3Z7TGpia_L2414Zo-WtcqfgLq9GjZs3O3ZsTDdN5oQmU1gRTud9rRo1z86053iuP3Xd6PXl6njfDx7IDXcyVVBI/w640-h480/6.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the old lubricant encrusted parts ready for the ultrasonic cleaner:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgh50LYAyRfBmL5xr8om_2O-aJyBSB6oLY9ZTtUOn6RceUzpLC_FKozXhrA0rQWDRAEZirSBO1asgNjkQv7bde_pmDDzm6zWChrBoLBF3cF55MT4T8Fg-6jkSm8nR29M1uSCSH3bxPsUQaX8vc1rEuqc0kB2um6eLH6wgza6biwzzwYiOlcp6YGnYBAonQ/s1200/7.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgh50LYAyRfBmL5xr8om_2O-aJyBSB6oLY9ZTtUOn6RceUzpLC_FKozXhrA0rQWDRAEZirSBO1asgNjkQv7bde_pmDDzm6zWChrBoLBF3cF55MT4T8Fg-6jkSm8nR29M1uSCSH3bxPsUQaX8vc1rEuqc0kB2um6eLH6wgza6biwzzwYiOlcp6YGnYBAonQ/w640-h480/7.jpg" width="640" /></a></div><div style="text-align: justify;">Nice and shiny after an hour in the cleaner:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9HJ1OwmjJ9bWo_-d5VTAt6EubzFlEM8K0-wNzHsewNQiKkEc1hD32ddwJOoCbgOfK5pvL9U_pnubffDa3lph92wxiSK8mini750C9fW0BW7scvuxCAjbvhywu-Quxpr-lCmAYPO5q8pOSBNDx0MLCubJVmIhgWB-ve-_0eJoiFF2tTEuMtvvVsOXzjRI/s1200/8.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9HJ1OwmjJ9bWo_-d5VTAt6EubzFlEM8K0-wNzHsewNQiKkEc1hD32ddwJOoCbgOfK5pvL9U_pnubffDa3lph92wxiSK8mini750C9fW0BW7scvuxCAjbvhywu-Quxpr-lCmAYPO5q8pOSBNDx0MLCubJVmIhgWB-ve-_0eJoiFF2tTEuMtvvVsOXzjRI/w640-h480/8.jpg" width="640" /></a></div><div style="text-align: justify;">Then I began to reassemble everything. It is important to put a <a href="https://beolover.com/products/damper-gasket-for-beogram-4000-4002-and-4004" target="_blank">new gasket</a> into the damper plunger:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJ1nNG6TQDNddBdHPI9BCMIJx2ISkkd24qI-4ML6loBVfY5PNmGs8ddefmu8qxJp7GZGbL0SbsVUYfXPHx3UcC8I0m7dydm4sR_4i9hg5eymf1jfWpUrmpB1GXeGWZ7PMJGUu1Zq25-S9gZxtwOT0o9UXP6AlFi-mz76mgEsBCQOY1aYyenwXUAAju0ps/s1200/9.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJ1nNG6TQDNddBdHPI9BCMIJx2ISkkd24qI-4ML6loBVfY5PNmGs8ddefmu8qxJp7GZGbL0SbsVUYfXPHx3UcC8I0m7dydm4sR_4i9hg5eymf1jfWpUrmpB1GXeGWZ7PMJGUu1Zq25-S9gZxtwOT0o9UXP6AlFi-mz76mgEsBCQOY1aYyenwXUAAju0ps/w640-h480/9.jpg" width="640" /></a></div><div style="text-align: justify;">This ensures that the arm lowering speed is consistent. The original gaskets have a tendency to occasionally cause the arm to drop un-dampened, which can be a harrowing moment (especially when a new $600 cartridge is mounted...;-).</div></div><div><div style="text-align: justify;">Unfortunately, the spindle nut holder broke apart in the ultrasonic cleaner. They are frequently cracked due to overtightened screws. Luckily, the Beolover has a <a href="https://beolover.com/products/spindle-nut-holder-for-beogram-4000-4002-and-4004" target="_blank">replacement part</a>, which is shown here next to the broken original:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKbe9FdVAXmsHuEvfqSzFkGKgvRNfHdfh5549ltI031QqHVZdPYLMyPcfKzoPzbYnmlAFELgDhiokdsZoYftP0qsE-9ZAvarB5JLii5Ybau26vlFpdprVjTVJaU6J3yrgkyZl1b1BCa88kaY4Qfv4FGlEJuvf0733X6YsT2rTtTnFQ1iy7iCTPKQHixvg/s1200/10.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKbe9FdVAXmsHuEvfqSzFkGKgvRNfHdfh5549ltI031QqHVZdPYLMyPcfKzoPzbYnmlAFELgDhiokdsZoYftP0qsE-9ZAvarB5JLii5Ybau26vlFpdprVjTVJaU6J3yrgkyZl1b1BCa88kaY4Qfv4FGlEJuvf0733X6YsT2rTtTnFQ1iy7iCTPKQHixvg/w640-h480/10.jpg" width="640" /></a></div><div style="text-align: justify;">Here it is shown installed. It uses the original screw:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhK8xk2UqJPqy8hd_9qzH-H2jlNzbvDyqWPmq_IuE9e4_NxBtdnYjALb40rItX1hG1h8eKUMyysHVCQp9CSQkBcVsK0pZwTIo9xrbNsbQXTJdwim-MnogDpU77q0dWMe1PYe6KAu0UXdNqnq1lMq5Bki7AvMzQv7DSrr9xPwc2zrthMZyAtn8iGyukQVLc/s1200/11.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhK8xk2UqJPqy8hd_9qzH-H2jlNzbvDyqWPmq_IuE9e4_NxBtdnYjALb40rItX1hG1h8eKUMyysHVCQp9CSQkBcVsK0pZwTIo9xrbNsbQXTJdwim-MnogDpU77q0dWMe1PYe6KAu0UXdNqnq1lMq5Bki7AvMzQv7DSrr9xPwc2zrthMZyAtn8iGyukQVLc/w640-h480/11.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the re-assembled arm lowering mechanism:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKRTbcke84oSNAKIdMYWJDVeVWynoe2kR62VzhqhA8fbo8XgzqaV8SfbPXhIuoKfS42_y4WX8B8rdUvsfFKnJFupBaHLegrOz-FhHEIYupWBq8glqUYfbk9JJH4KTmGN5Ul_BUSvlkNp3GhATRVb01QLs02UI6t312k5YTM5iSoM-akBRJg8ZiNCI_9JA/s1200/12.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKRTbcke84oSNAKIdMYWJDVeVWynoe2kR62VzhqhA8fbo8XgzqaV8SfbPXhIuoKfS42_y4WX8B8rdUvsfFKnJFupBaHLegrOz-FhHEIYupWBq8glqUYfbk9JJH4KTmGN5Ul_BUSvlkNp3GhATRVb01QLs02UI6t312k5YTM5iSoM-akBRJg8ZiNCI_9JA/w640-h480/12.jpg" width="640" /></a></div><div style="text-align: justify;">I also installed a new precision-machined aluminum carriage pulley to replace the original cracked plastic unit:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgTvYX2R2Gu38bSxYQGh3p0qu2R7j_gjDykNVz59SW7XkbrLxrIvRGO6EY6tKH3HIV4nOgLBqZeMMUYK_OtzdtNF7w4OnIVihuUrYGnFCIG0Bdwk3-TXEP3oSfr_i1bmtFdRxUxWgIXWTWpgvSdmAzDtitrD__LjwsZIylH9b0Th0nTD1lAOJMoZtPrk9U/s1200/13.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgTvYX2R2Gu38bSxYQGh3p0qu2R7j_gjDykNVz59SW7XkbrLxrIvRGO6EY6tKH3HIV4nOgLBqZeMMUYK_OtzdtNF7w4OnIVihuUrYGnFCIG0Bdwk3-TXEP3oSfr_i1bmtFdRxUxWgIXWTWpgvSdmAzDtitrD__LjwsZIylH9b0Th0nTD1lAOJMoZtPrk9U/w640-h480/13.jpg" width="640" /></a></div><div style="text-align: justify;">Now it was time to look into the damper-to-arm linkage, which is often also stuck due to hardened lubricants. It is located between the tone- and sensor arm assemblies, and mounted on the sensor arm side. You can see it here sticking out in the V-groove that is on the link mounted on the back of the counterweight assembly:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCPCSJCwzGtbkWzHeimXwRnYyDE4oFxAaJQm8Top9c1hfLUQlZj1x4hSqXgg9yO48fg6xShwEJP0mnAuo9pOJD4zkkNsqybr0qWOaf81NHrU_LTrb9vsaIeURY752F2hjkg_mZPtf1yjCyo6KK1pRePgoj70fmmKHmk_BoreI5MQv0nlzRpHSPQj7pajU/s1200/14.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCPCSJCwzGtbkWzHeimXwRnYyDE4oFxAaJQm8Top9c1hfLUQlZj1x4hSqXgg9yO48fg6xShwEJP0mnAuo9pOJD4zkkNsqybr0qWOaf81NHrU_LTrb9vsaIeURY752F2hjkg_mZPtf1yjCyo6KK1pRePgoj70fmmKHmk_BoreI5MQv0nlzRpHSPQj7pajU/w640-h480/14.jpg" width="640" /></a></div><div style="text-align: justify;">To get to the pivot point for cleaning and re-lubrication, the sensor arm needs to be removed. This shows the assembly out and the linkage removed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7lI9t7rJfF7VaKuB3XBRkxoSnTgq8eEThKLrdUbJSd7F-HmuE6PA6ccjkrbh0bI2MmOHHij6zebenTtxw33aHvo9e73hLY0F78xhQ-K5QbfJTLweb2IElIDp1W9Qb2rkCPNaOW4WLzDo6dVo30Xt-V_MiqjUdFfQMlRRA3t5HwHz-lm0co2FN0AOFF24/s1200/15.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7lI9t7rJfF7VaKuB3XBRkxoSnTgq8eEThKLrdUbJSd7F-HmuE6PA6ccjkrbh0bI2MmOHHij6zebenTtxw33aHvo9e73hLY0F78xhQ-K5QbfJTLweb2IElIDp1W9Qb2rkCPNaOW4WLzDo6dVo30Xt-V_MiqjUdFfQMlRRA3t5HwHz-lm0co2FN0AOFF24/w640-h480/15.jpg" width="640" /></a></div><div style="text-align: justify;">Make sure you do not loose the small spring that is under the locking washer if you try this at home.</div></div><div><div style="text-align: justify;">While I worked on this I also checked the small copper plate that eases the lateral arm movement when the arm is up. It is only attached with double sided tape and came off easily:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfKLE8se4rF0cBkRXcnHmoqVkpWXrIWe5nfse6e1SJ1PwAR9HuB1P6wGlGsVoJcD-iTRg1S-uh57xcAwWJg_hnio0kHFQqOzrX3eC17HSvz4pPUx6OznBmpyz457Cy7xPcbEYwEmldRgqlZfcfwqm3VcBETXeqeCrtqeBbunEl042qU-AjBuztdUfjVZU/s1200/16.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfKLE8se4rF0cBkRXcnHmoqVkpWXrIWe5nfse6e1SJ1PwAR9HuB1P6wGlGsVoJcD-iTRg1S-uh57xcAwWJg_hnio0kHFQqOzrX3eC17HSvz4pPUx6OznBmpyz457Cy7xPcbEYwEmldRgqlZfcfwqm3VcBETXeqeCrtqeBbunEl042qU-AjBuztdUfjVZU/w640-h480/16.jpg" width="640" /></a></div><div style="text-align: justify;">I cleaned the tape off and glued it back into place with epoxy:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFA0fR9McNy_vQ97kvpkJ2-10iaaGZjf0jzmnTeEFGylJWkMO7RjNP3p4dRfSIXgWakfDnzO1tAsQcQHpY81HeHnHR9tpCOZJj3sJ9bfZ6Z13kTRQsGK50yqBcHmu0kyO00xJxWv5qw16QX1ZiRvU3aEOlBbBilleuMfzuI7YDfuRsuwc9pFe99Ddn53k/s1200/17.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFA0fR9McNy_vQ97kvpkJ2-10iaaGZjf0jzmnTeEFGylJWkMO7RjNP3p4dRfSIXgWakfDnzO1tAsQcQHpY81HeHnHR9tpCOZJj3sJ9bfZ6Z13kTRQsGK50yqBcHmu0kyO00xJxWv5qw16QX1ZiRvU3aEOlBbBilleuMfzuI7YDfuRsuwc9pFe99Ddn53k/w640-h480/17.jpg" width="640" /></a></div><div style="text-align: justify;">The final step on the carriage was the replacement of the original incandescent bulb in the tracking sensor with a <a href="https://beolover.com/products/tracking-sensor-led-light-source-beogram-4002-4" target="_blank">Beolover LED assembly</a>. This shows the original black bulb housing still in place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzbhXUwlZ39o-G3SIy9_jbUpMaRAD5o9ZFiGUDbBzonA7e7Iks_VbyLZ4UdCx0jqeIH5xmfvTEs69U-0g2XQtPMPOZ4MDwN6XR-zVVkdb_BZ9UjUFpEFm2V0W_hB_jZ5xG-CVscEW09UvUztrVmZ3xwSfAa0iAv7o8Jn0Sy4PQR8O5c4uG7mzabj8TJUQ/s1200/18.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzbhXUwlZ39o-G3SIy9_jbUpMaRAD5o9ZFiGUDbBzonA7e7Iks_VbyLZ4UdCx0jqeIH5xmfvTEs69U-0g2XQtPMPOZ4MDwN6XR-zVVkdb_BZ9UjUFpEFm2V0W_hB_jZ5xG-CVscEW09UvUztrVmZ3xwSfAa0iAv7o8Jn0Sy4PQR8O5c4uG7mzabj8TJUQ/w640-h480/18.jpg" width="640" /></a></div><div style="text-align: justify;">I removed the bulb housing, which revealed the aperture that regulates the light on the photo sensor depending on the arm alignment:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgkegv62gTDpD6oGrM1sBfmFp5xRB8PGXiDT5O34JTCkY2Az6FHgl09ZoD9Pvs4jBaO7RF9E1FYASoOEYYO5qUiwwQuymUw2zR3iupzX-e3DmZq-yIXIdGBQT2ggC6xQpnv-C0EWpWikspSDPKfDX823335oGbEUUP8JYl1T4qBhWe9tBHeX3cXLtr3WTQ/s1200/19.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgkegv62gTDpD6oGrM1sBfmFp5xRB8PGXiDT5O34JTCkY2Az6FHgl09ZoD9Pvs4jBaO7RF9E1FYASoOEYYO5qUiwwQuymUw2zR3iupzX-e3DmZq-yIXIdGBQT2ggC6xQpnv-C0EWpWikspSDPKfDX823335oGbEUUP8JYl1T4qBhWe9tBHeX3cXLtr3WTQ/w640-h480/19.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the original bulb together with the Beolover LED assembly:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYXIlvmN5g8HE8_71Ipq_dAEXQU770mDAep8rcVZLAygSrqwyvpyphjYv5rT2gk7ngj96IP9DC7KlPiUc1Z96zcmhB2pHFfh1cT4N28C3d07yOneaz39L66b3z_oGu5VhJe_hNt6JMMn9XMK0GFR3QevIEZnVixuUTPHuV19zbV2l6Z7XOJvb8wNAWKOw/s1200/20.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYXIlvmN5g8HE8_71Ipq_dAEXQU770mDAep8rcVZLAygSrqwyvpyphjYv5rT2gk7ngj96IP9DC7KlPiUc1Z96zcmhB2pHFfh1cT4N28C3d07yOneaz39L66b3z_oGu5VhJe_hNt6JMMn9XMK0GFR3QevIEZnVixuUTPHuV19zbV2l6Z7XOJvb8wNAWKOw/w640-h480/20.jpg" width="640" /></a></div><div style="text-align: justify;">This shows it installed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiiAuGnAQls814j0ZeQ8NYOrX9PxEiZWu8KKaVldb1oVGbUNQcHR9KXp3m-tNWw232z2GBud9PIZx6yw4QIixNTCtYHeJ2hzCtlr2fPoIepdhcKgccNEn2zSH5OEbpn5QGMWbxDSPyw0-0x6W5oSv_pkPNwSiJvozDbXacgWpEjzMq4Ui_9PBVPmoSiuYI/s1200/21.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiiAuGnAQls814j0ZeQ8NYOrX9PxEiZWu8KKaVldb1oVGbUNQcHR9KXp3m-tNWw232z2GBud9PIZx6yw4QIixNTCtYHeJ2hzCtlr2fPoIepdhcKgccNEn2zSH5OEbpn5QGMWbxDSPyw0-0x6W5oSv_pkPNwSiJvozDbXacgWpEjzMq4Ui_9PBVPmoSiuYI/w640-h480/21.jpg" width="640" /></a></div><div style="text-align: justify;">Next I removed the RPM panel above the keypad. This shows it extracted and flipped over, revealing the bulb housings:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjNhCV9CrM5a1_FDUTuCaqs59E51_3sV3Ae03RMQeXCWqOc25KF8stoGTJOdmqoW3qItglIXwM1iyOP4AtT_WTpoGIzgB1lA7rqVud_nQs-6r80WcPTIPqlHAJN5FTAtFaApgQV3jzrokQ68I39VCRs-RrCExZMvkql1GHvbSeUc3AJkCy69Dyr-gExGk4/s1200/22.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjNhCV9CrM5a1_FDUTuCaqs59E51_3sV3Ae03RMQeXCWqOc25KF8stoGTJOdmqoW3qItglIXwM1iyOP4AtT_WTpoGIzgB1lA7rqVud_nQs-6r80WcPTIPqlHAJN5FTAtFaApgQV3jzrokQ68I39VCRs-RrCExZMvkql1GHvbSeUc3AJkCy69Dyr-gExGk4/w640-h480/22.jpg" width="640" /></a></div><div style="text-align: justify;">I removed the covers. The bulbs are located in the small aluminum parts that hold them in place::</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjt9tT3PxjTIdMets96TWHpnpQ10Fher7hMSiSZP84RS_MByyLC7_iaPAdNTGzoosw8DnB5zpg0TOLHFqifU-UqpDUwfpCuJJSwYk9_gzD8VA5GjuOoBr1dnp7DbvtEDleEjQRYM5-2uX51xoa7ZB2UxtfXNCi6RgWR-GsDxVa18t7h5aqg4Hz9sWQBsSI/s1200/23.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjt9tT3PxjTIdMets96TWHpnpQ10Fher7hMSiSZP84RS_MByyLC7_iaPAdNTGzoosw8DnB5zpg0TOLHFqifU-UqpDUwfpCuJJSwYk9_gzD8VA5GjuOoBr1dnp7DbvtEDleEjQRYM5-2uX51xoa7ZB2UxtfXNCi6RgWR-GsDxVa18t7h5aqg4Hz9sWQBsSI/w640-h480/23.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the removed bulbs together with the <a href="https://beolover.com/products/rpm-panel-led-backlight-beogram-4002-4" target="_blank">Beolover LED assemblies</a> that solder directly to the bulb solder points:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9uoGly09OQbXw8gp8CIxKc9s_THvoSEOGfv4-RFEgKjQt5XzTNvKVyPf8k0482IMhwJ_t4BHEuGxDhcmYtKNPZhfAnGGn_Pgvn5zE5pbP4yU8jCSGf89DboHU5B2AJYD6GXE7wbAE8Dq42zLOTz59aSbb8X1UJk1J7ak76MmE5cQAa_WV27Mtji_cWFo/s1200/24.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9uoGly09OQbXw8gp8CIxKc9s_THvoSEOGfv4-RFEgKjQt5XzTNvKVyPf8k0482IMhwJ_t4BHEuGxDhcmYtKNPZhfAnGGn_Pgvn5zE5pbP4yU8jCSGf89DboHU5B2AJYD6GXE7wbAE8Dq42zLOTz59aSbb8X1UJk1J7ak76MmE5cQAa_WV27Mtji_cWFo/w640-h480/24.jpg" width="640" /></a></div><div style="text-align: justify;">I soldered them into place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhhEohS4msJWGVBjgBkL81ipraWuE49gT-tW9Qm0vTvmBYb3NVeN6SrZFJZrNgXuKPkn2DUdyH8p5L5ORiJRkt-aM8EW1ha0B0PzPv6R2cOajoqWFO_5DG7cEzH4nIrCBJ1EWwnNNLJEa4yQEk4MfKlfXsmQ1a7Av3bRHzJsCtdoIyMOY46YNRZCYdCQjA/s1200/25.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhhEohS4msJWGVBjgBkL81ipraWuE49gT-tW9Qm0vTvmBYb3NVeN6SrZFJZrNgXuKPkn2DUdyH8p5L5ORiJRkt-aM8EW1ha0B0PzPv6R2cOajoqWFO_5DG7cEzH4nIrCBJ1EWwnNNLJEa4yQEk4MfKlfXsmQ1a7Av3bRHzJsCtdoIyMOY46YNRZCYdCQjA/w640-h480/25.jpg" width="640" /></a></div><div style="text-align: justify;">They are basically extensions of the PCB:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhu-us7DOsgPNewbS0cjFPjeUh8sklO2c2E9X47rmFbvPE-78tnGpSv4RVKRYSjULV9HGUEuZtRbJ60dd2TkUVUbSu937KzMC6KyGbBpem9Rc2gYO9Pqo6PCCMXrUbJ6I-8ABLffzfd_k8l5C8M2tofOg2D4IXgPrxE69Opnlgy0lRTnLya90ZNUUMK4dw/s1200/26.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhu-us7DOsgPNewbS0cjFPjeUh8sklO2c2E9X47rmFbvPE-78tnGpSv4RVKRYSjULV9HGUEuZtRbJ60dd2TkUVUbSu937KzMC6KyGbBpem9Rc2gYO9Pqo6PCCMXrUbJ6I-8ABLffzfd_k8l5C8M2tofOg2D4IXgPrxE69Opnlgy0lRTnLya90ZNUUMK4dw/w640-h480/26.jpg" width="640" /></a></div><div style="text-align: justify;">The bulb covers can be re-installed, the LED boards do not obstruct them:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_ERtogdcCCO2ib83uZ6j2GjQzQsKW9c2IyHBArMbnLn9Km6n-FBAeJOUUp8pUSj4iu-R-Kns0-Q1SEQ1IA6GfDz02Vx_goX_OJIZOhWq1ZcRG461N5WXPRa4JpWpYKH1Tjxpec-NroBqkBLwiN6FvtH6DBF2YsHA8awnVAHdp894HiLL4nbzem2rFYW8/s1200/27.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_ERtogdcCCO2ib83uZ6j2GjQzQsKW9c2IyHBArMbnLn9Km6n-FBAeJOUUp8pUSj4iu-R-Kns0-Q1SEQ1IA6GfDz02Vx_goX_OJIZOhWq1ZcRG461N5WXPRa4JpWpYKH1Tjxpec-NroBqkBLwiN6FvtH6DBF2YsHA8awnVAHdp894HiLL4nbzem2rFYW8/w640-h480/27.jpg" width="640" /></a></div><div style="text-align: justify;">Next in line were the PCBs. I started with the main board. This board has two power transistors mounted on the solder-side. It is best to replace them with the board still in place since their heatsinks need to be aligned with the mounting holes of the board. This shows IC1, which is usually a TIP120: </div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivUTTo9H_IFmJ7vdV5W6EAICuzDCLIOO-HhKOmVT4FZ03abOMHqIrGrqvo79O2cD7miy0zQ_x5d6QG-5tm9NnWWJ_h_FElisgctEmng7HsmQ21N1LlTmxKXnI-WiH1AQgX16WNb8ZSFZ5NgXszlEwNP5gdIn2FPulj09nB1CvIZFzQu8E-Fb07PvgDh4E/s1200/28.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivUTTo9H_IFmJ7vdV5W6EAICuzDCLIOO-HhKOmVT4FZ03abOMHqIrGrqvo79O2cD7miy0zQ_x5d6QG-5tm9NnWWJ_h_FElisgctEmng7HsmQ21N1LlTmxKXnI-WiH1AQgX16WNb8ZSFZ5NgXszlEwNP5gdIn2FPulj09nB1CvIZFzQu8E-Fb07PvgDh4E/w640-h480/28.jpg" width="640" /></a></div><div style="text-align: justify;">I usually replace it with a TIP102 with is a stronger version. The modern replacements need a 100nF capacitor between the emitter and ground to quench some strange high-frequency oscillations that can cause the record detection circuitry to malfunction. The cap is the small yellow component above the transistor:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEie7P5VyWoUy2iyxwh1Y5KFCE1pZ9B9zd9oOCXm2HIOYV7eh0IHmf-A20qFu8jGLokU1DZsCaszTbJrhhFRq1dGGJSnaaa38pKif-JsRMhHtJYYGL62MHjLvkvAIxkRbDIrbfzRxscPPkRa1myJ9egwsJZt3PzrTOo9qbLdfa2ZTvXilLUbPWANXIH7vqk/s1200/29.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEie7P5VyWoUy2iyxwh1Y5KFCE1pZ9B9zd9oOCXm2HIOYV7eh0IHmf-A20qFu8jGLokU1DZsCaszTbJrhhFRq1dGGJSnaaa38pKif-JsRMhHtJYYGL62MHjLvkvAIxkRbDIrbfzRxscPPkRa1myJ9egwsJZt3PzrTOo9qbLdfa2ZTvXilLUbPWANXIH7vqk/w640-h480/29.jpg" width="640" /></a></div><div style="text-align: justify;">I also replaced IC4 with a TIP107 and moved on to the component side of the board. Unfortunately, I forgot to take a picture of the original state of the board. I only took one of the 'RPM section', which consists of the RPM relay and the master RPM trimmers to the left:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKoG7YiHXBxq7r8IJELc8_od59DNdg-vov3TRQGW9-6V-Y_i0n_SYfVpNVswPZOu_ZGN8Iy5z3F1vnN2gjtoBTMU6Ogou_3c4S9Izwo6rRljVmnlG9Rwsq5wQtJrj0JxrThtjk-_YkrvKaZUWA3SrFCjh1dY1jPvxJRgNgzxxaEsnkczh36kLLrv0HJyY/s1200/30.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKoG7YiHXBxq7r8IJELc8_od59DNdg-vov3TRQGW9-6V-Y_i0n_SYfVpNVswPZOu_ZGN8Iy5z3F1vnN2gjtoBTMU6Ogou_3c4S9Izwo6rRljVmnlG9Rwsq5wQtJrj0JxrThtjk-_YkrvKaZUWA3SrFCjh1dY1jPvxJRgNgzxxaEsnkczh36kLLrv0HJyY/w640-h480/30.jpg" width="640" /></a></div><div style="text-align: justify;">As usual I replaced all electrolytic capacitors, power transistors, the relay and the RPM trimmers, and the high-gain transistor in the record detection circuit (they often have reduced gain, which can imperil the record detection function). This shows the board with the new components installed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDNWXWOtDkdGW8EDPgpiu6hT32DEQyDVZ7jfmiafdpSffpT_BA4SNiXla1zUubOlS8mqlgOFt2VLBXhdAcotNHV57mzsY0ELURdNSx7Mf_J1IkskOcAZL7TgQRCQWMDCKBUlKeM2FhKaVn1Gmedye0gVRKbSRyePfmOSpp43qre9Bb-3_YFTXMl5MvdOA/s1200/32.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDNWXWOtDkdGW8EDPgpiu6hT32DEQyDVZ7jfmiafdpSffpT_BA4SNiXla1zUubOlS8mqlgOFt2VLBXhdAcotNHV57mzsY0ELURdNSx7Mf_J1IkskOcAZL7TgQRCQWMDCKBUlKeM2FhKaVn1Gmedye0gVRKbSRyePfmOSpp43qre9Bb-3_YFTXMl5MvdOA/w640-h480/32.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">Here a detail shot of the rebuilt RPM section with a <a href="https://beolover.com/products/siemens-relay-replacement-for-beogram-4000-4002-and-4004" target="_blank">Beolover replacement relay</a> and modern 25-turn trimmers for precise RPM adjustment:</div><div style="margin-left: 1em; margin-right: 1em; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzwK9BVPW-Lj1_79eneNHJU2UwxalVfaTYn-GzvAQ03x4b9vTptH67aJbqJdpjIh9Zr8UJ2h9GC-Ti1FNa98g7l6kAk3k09xGXNyAkf3xb7gzI6uxTwm4Sye_yhVsmuET5ApjIN1WBIP2PNv3mLbc3GkTDFzaUBouFndwh1vEMfI9bNl0fw37sPkuIAw0/s1200/31.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em; text-align: center;"></a><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzwK9BVPW-Lj1_79eneNHJU2UwxalVfaTYn-GzvAQ03x4b9vTptH67aJbqJdpjIh9Zr8UJ2h9GC-Ti1FNa98g7l6kAk3k09xGXNyAkf3xb7gzI6uxTwm4Sye_yhVsmuET5ApjIN1WBIP2PNv3mLbc3GkTDFzaUBouFndwh1vEMfI9bNl0fw37sPkuIAw0/s1200/31.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzwK9BVPW-Lj1_79eneNHJU2UwxalVfaTYn-GzvAQ03x4b9vTptH67aJbqJdpjIh9Zr8UJ2h9GC-Ti1FNa98g7l6kAk3k09xGXNyAkf3xb7gzI6uxTwm4Sye_yhVsmuET5ApjIN1WBIP2PNv3mLbc3GkTDFzaUBouFndwh1vEMfI9bNl0fw37sPkuIAw0/w640-h480/31.jpg" width="640" /></a></div></div><div><div style="text-align: justify;">Then I moved on to the output board. This shows the original relay and capacitor still in place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBd3DMUeZNOogOgZsG6ikg7tm5w5rJVRNXfmH9M5aF372rVU_TJVo25rN35iKSbHqjQ-CIQOeCVt3k91ISEPXOwKMjNrlWYQ9y2bSXMC-TJjC9b7yBvKn2LtaUmaESmnzrpFPvZhlAIxekKE8511ws1THTqbZm4xwXGD6A2T5cBSfInT3BniPkKtmP38Y/s1200/32a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBd3DMUeZNOogOgZsG6ikg7tm5w5rJVRNXfmH9M5aF372rVU_TJVo25rN35iKSbHqjQ-CIQOeCVt3k91ISEPXOwKMjNrlWYQ9y2bSXMC-TJjC9b7yBvKn2LtaUmaESmnzrpFPvZhlAIxekKE8511ws1THTqbZm4xwXGD6A2T5cBSfInT3BniPkKtmP38Y/w640-h480/32a.jpg" width="640" /></a></div><div style="text-align: justify;">I replaced the relay with a <a href="https://beolover.com/products/siemens-relay-replacement-for-beogram-4000-4002-and-4004">Beolover replacement</a> and put in a new capacitor. I also installed a (red) switch that allows connecting system and signal grounds in case there is a hum issue:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEherzHvR-yMoBR5PD0NOx0tI0yFWpc4nIpg5BjodwfgHtEFgGqCCLlHS7BiIlpdYwY6rUbfXFNmZgrJOG0Yssg6CABkH5BFNGQeFSYv1c_Hc1FE_VM4f1w1DlSMTNosy8ATQFCUQ2IY2IDICdRxfcTyIckKv9eYug29sSzBG9cYhkI3PkuHLJSwu8wQ0vc/s1200/32b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEherzHvR-yMoBR5PD0NOx0tI0yFWpc4nIpg5BjodwfgHtEFgGqCCLlHS7BiIlpdYwY6rUbfXFNmZgrJOG0Yssg6CABkH5BFNGQeFSYv1c_Hc1FE_VM4f1w1DlSMTNosy8ATQFCUQ2IY2IDICdRxfcTyIckKv9eYug29sSzBG9cYhkI3PkuHLJSwu8wQ0vc/w640-h480/32b.jpg" width="640" /></a></div><div style="text-align: justify;">At this point it was time to clear out the enclosure since this unit had completely deteriorated transport lock bushings. First I removed the original deal-capacitance main capacitor:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiA8VxFYVyDSa6v6aRpNRQPlQNlHbUvL_VO_ajwfql7WBDf5_d3OWVaeAL4PSS6_wFtQh-iyf6f-AGMoz4ojdnwYcNTzJPxt2TkwXfznhnGZFzIWIKQDVF0RCsoex8us4jjd7VTfCxHNAzCPXtk1yHYCKv-mu0kQuhduPiwnmjuACXkJCEP-fKz4zk8dk0/s1200/33.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiA8VxFYVyDSa6v6aRpNRQPlQNlHbUvL_VO_ajwfql7WBDf5_d3OWVaeAL4PSS6_wFtQh-iyf6f-AGMoz4ojdnwYcNTzJPxt2TkwXfznhnGZFzIWIKQDVF0RCsoex8us4jjd7VTfCxHNAzCPXtk1yHYCKv-mu0kQuhduPiwnmjuACXkJCEP-fKz4zk8dk0/w640-h480/33.jpg" width="640" /></a></div><div style="text-align: justify;">Then it was time to take the entire floating chassis assembly out. This is done by removing the transport locks:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjSXlzkVOjNjuo5OoYH_cdwjmS78pzkWH8HDUNinjh1UoDavKenlh-gjY5IkdnmJ6oIb3NpTf3m3fa8mzuz_FDwM-hbg2gOMOyz3japxc0lVWqG6yOqeQ5BYFH7rB8P3qAFq0Sw9OJrP4HCxkiA_OBRTQ-d96b6BOAN5t2FBvbUUHSGlhYvz8AYJeOVrmI/s1200/34.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjSXlzkVOjNjuo5OoYH_cdwjmS78pzkWH8HDUNinjh1UoDavKenlh-gjY5IkdnmJ6oIb3NpTf3m3fa8mzuz_FDwM-hbg2gOMOyz3japxc0lVWqG6yOqeQ5BYFH7rB8P3qAFq0Sw9OJrP4HCxkiA_OBRTQ-d96b6BOAN5t2FBvbUUHSGlhYvz8AYJeOVrmI/w640-h480/34.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the naked enclosure:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjsCWP-Urs5iGSu5nvYVx7b9FkJrC1mjdRkNqKmS784cxrOVdM2TS1nCdY5rF6vE9iqM_SMxmsogX8WOAiQBSw12NM7o0RS2YGH8SrLonPSU5fzvEA-dalCxDuysXiPbp3NyT7RLVs1F8c6IWGLjE49vrK3b3R0284qUIVNJwCH_s7SoI2tP7Gg9_Hsjpo/s1200/35.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjsCWP-Urs5iGSu5nvYVx7b9FkJrC1mjdRkNqKmS784cxrOVdM2TS1nCdY5rF6vE9iqM_SMxmsogX8WOAiQBSw12NM7o0RS2YGH8SrLonPSU5fzvEA-dalCxDuysXiPbp3NyT7RLVs1F8c6IWGLjE49vrK3b3R0284qUIVNJwCH_s7SoI2tP7Gg9_Hsjpo/w640-h480/35.jpg" width="640" /></a></div><div style="text-align: justify;">An impression of the remains of the original transport lock bushings:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeX3hLNaSnrgbW6Ca25A_eHivf_zBXIHMdxBLk-X_YCdNvVkfahPxgTqyiKR5yPmT3O3GbC5sbYlWJc4Gx0jWxIMbRAdROckO9miGmz-0WW9vSr_4ooZ69AbGLy-_K1Kvqti0pjuC2JuJ_X29qV71Z9by8bNmOhYloCU3HCgYlxYSFtyEyo9fu0iwgdAs/s1200/36.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeX3hLNaSnrgbW6Ca25A_eHivf_zBXIHMdxBLk-X_YCdNvVkfahPxgTqyiKR5yPmT3O3GbC5sbYlWJc4Gx0jWxIMbRAdROckO9miGmz-0WW9vSr_4ooZ69AbGLy-_K1Kvqti0pjuC2JuJ_X29qV71Z9by8bNmOhYloCU3HCgYlxYSFtyEyo9fu0iwgdAs/w640-h480/36.jpg" width="640" /></a></div><div style="text-align: justify;">Luckily, there is a Beolover replacement part for these. This shows the <a href="https://beolover.com/products/transport-lock-bushings-for-beogram-4000-4002-and-4004" target="_blank">three replacement bushings</a>:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3jHIUKpbiN2KTYNGBYADBnCpQZY-_JUP4PQQ_UzeBKwD05z59n0DA9ccpUQIjzzILyg4Th8nHWqoIQ8B414S5NMQwQgtPpMPWaxtV3TF3usmdrxtC5Ycp5vycmShCfbnxnqqI5amesxDpDE135M-4L_qY2aE5KsR2j2y5udgvkQGYnf4l34F5o4M1GEU/s1200/37%20Beogram%204000%204002%204004%20transport%20lock%20rubber%20bushing.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3jHIUKpbiN2KTYNGBYADBnCpQZY-_JUP4PQQ_UzeBKwD05z59n0DA9ccpUQIjzzILyg4Th8nHWqoIQ8B414S5NMQwQgtPpMPWaxtV3TF3usmdrxtC5Ycp5vycmShCfbnxnqqI5amesxDpDE135M-4L_qY2aE5KsR2j2y5udgvkQGYnf4l34F5o4M1GEU/w640-h480/37%20Beogram%204000%204002%204004%20transport%20lock%20rubber%20bushing.jpg" width="640" /></a></div><div style="text-align: justify;">They install very easily due to their two-component design. This shows one of the 'empty' bushings receptacles:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1wqr-DsP3hkq2DP2c8kK1S9rv4M2QYKWBjDQxdyJH5YcsN1XYtoI1BoGA4bQfTVeddK0DR9p-_OdvZRsIoK1Hsb6iehA5PTmUiv-6-6spjoSCMJe5ViPDWMslqvHI1m0vmt5UlfS250pQ_vJVs0Dlgv5wioAuGhfuySHAE6F6ndBOaM3eN4ASiR7l8rA/s1200/38%20Beogram%204000%204002%204004%20transport%20lock%20rubber%20bushing.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1wqr-DsP3hkq2DP2c8kK1S9rv4M2QYKWBjDQxdyJH5YcsN1XYtoI1BoGA4bQfTVeddK0DR9p-_OdvZRsIoK1Hsb6iehA5PTmUiv-6-6spjoSCMJe5ViPDWMslqvHI1m0vmt5UlfS250pQ_vJVs0Dlgv5wioAuGhfuySHAE6F6ndBOaM3eN4ASiR7l8rA/w640-h480/38%20Beogram%204000%204002%204004%20transport%20lock%20rubber%20bushing.jpg" width="640" /></a></div><div style="text-align: justify;">With one half of a new bushing installed</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrCzqNlilw4bUAy3oifQXGS0O9WIHQwg3w3IYtYr2YMuYPW0Sl7CvHLIE7HD4HA05lZTZv63x_6aKKLFAQWKgNT7AArSzRdqQOs-tNorx0JBtdcb51HibKiuSP0jCKPs10BfYNsLFhQb1M4hxj5ChWdU_o2qYfZxhoTuCXC9Hm8bPZviWriuqaQZgsDjk/s1200/39%20Beogram%204000%204002%204004%20transport%20lock%20rubber%20bushing.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrCzqNlilw4bUAy3oifQXGS0O9WIHQwg3w3IYtYr2YMuYPW0Sl7CvHLIE7HD4HA05lZTZv63x_6aKKLFAQWKgNT7AArSzRdqQOs-tNorx0JBtdcb51HibKiuSP0jCKPs10BfYNsLFhQb1M4hxj5ChWdU_o2qYfZxhoTuCXC9Hm8bPZviWriuqaQZgsDjk/w640-h480/39%20Beogram%204000%204002%204004%20transport%20lock%20rubber%20bushing.jpg" width="640" /></a></div><div style="text-align: justify;">and completed with the other:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhH9lvQDuN_9L_2dPjRKrGzHl8P-34QhVk-pgCXbdctrDKi4oFKrpkP7_6nE0I4KZg7MNIGQyRAJCqBYzVJZrSTXcwiyWtKFKWrBLW-yfUD9WX0XXof_jWhiYe-9o0QekkFo7yQ6u9tYcOhmF2EdQKLOTM4CNBBHgs3OXgQ7zAtO6LFHxMRdEXlBPQbtu0/s1200/40%20Beogram%204000%204002%204004%20transport%20lock%20rubber%20bushing.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhH9lvQDuN_9L_2dPjRKrGzHl8P-34QhVk-pgCXbdctrDKi4oFKrpkP7_6nE0I4KZg7MNIGQyRAJCqBYzVJZrSTXcwiyWtKFKWrBLW-yfUD9WX0XXof_jWhiYe-9o0QekkFo7yQ6u9tYcOhmF2EdQKLOTM4CNBBHgs3OXgQ7zAtO6LFHxMRdEXlBPQbtu0/w640-h480/40%20Beogram%204000%204002%204004%20transport%20lock%20rubber%20bushing.jpg" width="640" /></a></div><div style="text-align: justify;">Here an impression how it looks with the locking bolt in place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-7JrcgI4l9d8M1hyFo9YFtTw4FFA8YOi19XSpeSR9egmQPNTvpGqbxlKy2dS7SC_PucH6BFPNegVxadLWqSKhqaaPaNcopCRMO2b_0A55nyl6zzSwM3Wz0-CYw1OYEXNwg2KP3RACRHyExCxCFbxCwYRjyew4ffjFC_3qX2lJ2QjOkqn2BQ5-QpjDq2k/s1200/41%20Beogram%204000%204002%204004%20transport%20lock%20rubber%20bushing.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-7JrcgI4l9d8M1hyFo9YFtTw4FFA8YOi19XSpeSR9egmQPNTvpGqbxlKy2dS7SC_PucH6BFPNegVxadLWqSKhqaaPaNcopCRMO2b_0A55nyl6zzSwM3Wz0-CYw1OYEXNwg2KP3RACRHyExCxCFbxCwYRjyew4ffjFC_3qX2lJ2QjOkqn2BQ5-QpjDq2k/w640-h480/41%20Beogram%204000%204002%204004%20transport%20lock%20rubber%20bushing.jpg" width="640" /></a></div><div style="text-align: justify;">And on the way to the reassembly of the lock:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEimxksMjQJMR0lmfoT5YRZW6kQ3JS9XyRwEUF_dFNswqHXZMbwbeytzC3GtsIkLnp8o_9o1PnQQMFJ593zclhSjp8mYqfq5BTjR03HpKxuxDJNiOPVsBU_JT4ERJE1yCOTBNE4BNMhkistsptV9CByoeeFBss-FH_gmsbQRhl4Ssp57x13RPyJz-KQJHEE/s1200/42%20Beogram%204000%204002%204004%20transport%20lock%20rubber%20bushing.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEimxksMjQJMR0lmfoT5YRZW6kQ3JS9XyRwEUF_dFNswqHXZMbwbeytzC3GtsIkLnp8o_9o1PnQQMFJ593zclhSjp8mYqfq5BTjR03HpKxuxDJNiOPVsBU_JT4ERJE1yCOTBNE4BNMhkistsptV9CByoeeFBss-FH_gmsbQRhl4Ssp57x13RPyJz-KQJHEE/w640-h480/42%20Beogram%204000%204002%204004%20transport%20lock%20rubber%20bushing.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the completed lock:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0hp5gE7M3IG5sWONGUFqQNHv0haKofR3Kjn6-n4SNbNSAN73Tkm05BvMpk7KwGcBeyjOV1LQRhJ6uCkLyCXKvgxeHm7BOVlVDd-P8xtMvdUcaD0cM2z4qAg0cOFvvl0j4abAR0EXaRzn-oQafYyg0YRR63FsHyDPQ8S0x3jYHCC-AlYp6aQB_DcIIpKI/s1200/43%20IMG_3895.HEIC.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh0hp5gE7M3IG5sWONGUFqQNHv0haKofR3Kjn6-n4SNbNSAN73Tkm05BvMpk7KwGcBeyjOV1LQRhJ6uCkLyCXKvgxeHm7BOVlVDd-P8xtMvdUcaD0cM2z4qAg0cOFvvl0j4abAR0EXaRzn-oQafYyg0YRR63FsHyDPQ8S0x3jYHCC-AlYp6aQB_DcIIpKI/w640-h480/43%20IMG_3895.HEIC.jpg" width="640" /></a></div><div style="text-align: justify;">This Beogram also had lost its original plinth guiding washers. Someone replaced them with regular shoulder washers, which is an emergency solution at best:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEih2BsTAcyxsVvuWseZ9cA2n20v-Wy2fsV8p70pm5q3J3hqcnTk8pTMrngZOccnCZgpXTrFNyUfFPpXjRcql45lSg8gvrZfOJgRuseFY1Xhs0n7N1rbCiwizc78Q1MJIpyzeQe-vNB7JJCLrCEuep30aEjEORAFzQrbt3tEXALVTs8Si-GPchsasIIs6Hc/s1200/44.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEih2BsTAcyxsVvuWseZ9cA2n20v-Wy2fsV8p70pm5q3J3hqcnTk8pTMrngZOccnCZgpXTrFNyUfFPpXjRcql45lSg8gvrZfOJgRuseFY1Xhs0n7N1rbCiwizc78Q1MJIpyzeQe-vNB7JJCLrCEuep30aEjEORAFzQrbt3tEXALVTs8Si-GPchsasIIs6Hc/w640-h480/44.jpg" width="640" /></a></div><div style="text-align: justify;">The original washers are eccentric, which allows adjusting the lateral position of the plinth a bit. This shows the <a href="https://beolover.com/products/plinth-guide-washer-set-for-beogram-4000-4002-and-4004" target="_blank">Beolover replacements</a>:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZTQWCTPtxNo6rUcplhLHY0CckLloRN923Prbn-Chrpbmpd-TP8Hsd5bi2jkxaH8LR2lolsqeixbMNiY75qr-0lNZEbgcrrN7mSXg8xLq-YUQ2rymP76SeMbl_m6DjSua81NUMEGqt_jcxDmy9IfVgJYTdGjkTQyPO7aL0xk5m3qXOzqQT3OAf74Y_leU/s1200/45.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZTQWCTPtxNo6rUcplhLHY0CckLloRN923Prbn-Chrpbmpd-TP8Hsd5bi2jkxaH8LR2lolsqeixbMNiY75qr-0lNZEbgcrrN7mSXg8xLq-YUQ2rymP76SeMbl_m6DjSua81NUMEGqt_jcxDmy9IfVgJYTdGjkTQyPO7aL0xk5m3qXOzqQT3OAf74Y_leU/w640-h480/45.jpg" width="640" /></a></div><div style="text-align: justify;">They are made from resilient Nylon for smooth movement of the plinth:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiuelidd_1y3gIY3dYKUIw4XzQ-KABJyuhH0a-eGTzvVDkgaU3DL70xH8UklZIzGvJQwP2iC_t931J_3eNYg1Irih794b6hytQgVBFz03e9EG6u0p_yc6Qn-OpN7CRhl2n-FwoLi1QJHnlo7u5Yq_GtDIWRiGOxTvwMSPLwshm5JWlZdBQ8urduvbGtXSE/s1200/46.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiuelidd_1y3gIY3dYKUIw4XzQ-KABJyuhH0a-eGTzvVDkgaU3DL70xH8UklZIzGvJQwP2iC_t931J_3eNYg1Irih794b6hytQgVBFz03e9EG6u0p_yc6Qn-OpN7CRhl2n-FwoLi1QJHnlo7u5Yq_GtDIWRiGOxTvwMSPLwshm5JWlZdBQ8urduvbGtXSE/w640-h480/46.jpg" width="640" /></a></div><div style="text-align: justify;">There was still one light bulb left that needed to be replaced, the one in the sensor arm. This shows the small compartment at the end of the arm pulled out. You can see the bulb in place. Next to it is the <a href="https://beolover.com/products/copy-of-tracking-sensor-led-light-source-beogram-4002-4" target="_blank">Beolover LED assembly that replaces the bulb</a> together with its alignment aid:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgSxlDnjaC2mlGCUDK6v8O33VR1MVgsPftGVZEF9VQhK2To0L6KDvvEbovmm9FRnPtovHg-Q9-b1MKbKSfRX2q_WqxSl3KQ1dbiZkF7Uy0oCnrDoraqIbVZws9G3WL0M-tLP4YfWamcluFZZOq130natx0kvUxIScCLsUR1AXuWxhBtFG6kyhMTnd4ZlDY/s1200/47.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgSxlDnjaC2mlGCUDK6v8O33VR1MVgsPftGVZEF9VQhK2To0L6KDvvEbovmm9FRnPtovHg-Q9-b1MKbKSfRX2q_WqxSl3KQ1dbiZkF7Uy0oCnrDoraqIbVZws9G3WL0M-tLP4YfWamcluFZZOq130natx0kvUxIScCLsUR1AXuWxhBtFG6kyhMTnd4ZlDY/w640-h480/47.jpg" width="640" /></a></div><div style="text-align: justify;">I removed the bulb and installed the LED board:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBPTjqVYgo4bJJko5huVYJx5OQ8Uca37Wah63jSCb2U2mPp_HxuOh5QR_HEzI_SCuf5L5wnwGsQQj-RDGXd1lOfdObYdPbwF75mJ_SvLKRv5LP9239xWHclQ00qisUQjnjThkRXryD0j4z1a_AJ8W0VQUy77sATePx4e2ekK8EobDx_AhsK99oWX9cklI/s1200/48.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBPTjqVYgo4bJJko5huVYJx5OQ8Uca37Wah63jSCb2U2mPp_HxuOh5QR_HEzI_SCuf5L5wnwGsQQj-RDGXd1lOfdObYdPbwF75mJ_SvLKRv5LP9239xWHclQ00qisUQjnjThkRXryD0j4z1a_AJ8W0VQUy77sATePx4e2ekK8EobDx_AhsK99oWX9cklI/w640-h480/48.jpg" width="640" /></a></div><div style="text-align: justify;">Then I put in a new reservoir capacitor. Since double-capacitance units like the original unit are not made anymore, I used a replacement assembly composed of a 3D printed adapter in which two standard capacitors are mounted:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhg6qawy0nULhhyphenhyphenjhtFF7NY5uB8FxmXZow4fZvM_zNFcQcrhyXs0pS_GNVGBiOT8DJ5v9bTF8bHknJmXXiqG6RYvcj9SUSOPI9A5DmSqoo5Yg7inIuLBbaohNtJ7Byy5CRSKKrOMTPVDuuFVlbV7bfp35MRizk45CbtMP8hJzRRUinWcYtmuAyflj4pBkQ/s1200/49.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhg6qawy0nULhhyphenhyphenjhtFF7NY5uB8FxmXZow4fZvM_zNFcQcrhyXs0pS_GNVGBiOT8DJ5v9bTF8bHknJmXXiqG6RYvcj9SUSOPI9A5DmSqoo5Yg7inIuLBbaohNtJ7Byy5CRSKKrOMTPVDuuFVlbV7bfp35MRizk45CbtMP8hJzRRUinWcYtmuAyflj4pBkQ/w640-h480/49.jpg" width="640" /></a></div><div style="text-align: justify;">Next I focused on repairing the off-switch on the carriage position detector board. It had lost its plastic extension. This prevented this Beogram from turning off properly when the carriage was in home position:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7s30rhanE_WbqAWWtz9pI-9l5LEfAvVY2dfhSEo0BWaPBgW5d-tXNUtcApkW-CZm_n-QRelgyp9nTpejSBmPfEddDNt_QSzkVrAHlQOphNhT5s6UfF0EdQdEMZ3-PwkIN6NShnGvKlU5uuCC6xqKz0UdHquZsk2zpq9vxYA89p8jFQ9J5QLZp61_U62Q/s1200/50.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7s30rhanE_WbqAWWtz9pI-9l5LEfAvVY2dfhSEo0BWaPBgW5d-tXNUtcApkW-CZm_n-QRelgyp9nTpejSBmPfEddDNt_QSzkVrAHlQOphNhT5s6UfF0EdQdEMZ3-PwkIN6NShnGvKlU5uuCC6xqKz0UdHquZsk2zpq9vxYA89p8jFQ9J5QLZp61_U62Q/w640-h480/50.jpg" width="640" /></a></div><div style="text-align: justify;">To repair this issue, it is best to remove the PCB:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvzVlMxOyCIgnd43LKUn7Xn3cfZlnETpmCKdh5yKijcZjTCR0RvNGFxMSm8mRX9NsuE0VHmLLSkIbbkQ_h241ci0XEB7VrLbpwjiADTD3INgV4tXqfXEV51K7n3oShu08UyJDa-1BViTH2U7ITLRkqqDa_EEPz_PdOxRlU-_kfZ_yToqNoJRY0IsWiFkw/s1200/51.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvzVlMxOyCIgnd43LKUn7Xn3cfZlnETpmCKdh5yKijcZjTCR0RvNGFxMSm8mRX9NsuE0VHmLLSkIbbkQ_h241ci0XEB7VrLbpwjiADTD3INgV4tXqfXEV51K7n3oShu08UyJDa-1BViTH2U7ITLRkqqDa_EEPz_PdOxRlU-_kfZ_yToqNoJRY0IsWiFkw/w640-h480/51.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the other switch on this board which still sported the plastic part:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4lW9o-ykftUPyy81aWZca8fEiz3GswDiiQ7k1bp3caUj2-zKJdXuqKWAyDnSsJ-22sW7Yi4Bxe9fIkyZkGk_JH0K_w72639NO1DuhhON-UbDsKfMyEeiXKNKydWaSaL8zjMuIJ3JLdz3DLgAb4n7rhZwf0vMbFWERe9PiIpXxCGO5dq8uhoR3a3FwATg/s1200/52.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4lW9o-ykftUPyy81aWZca8fEiz3GswDiiQ7k1bp3caUj2-zKJdXuqKWAyDnSsJ-22sW7Yi4Bxe9fIkyZkGk_JH0K_w72639NO1DuhhON-UbDsKfMyEeiXKNKydWaSaL8zjMuIJ3JLdz3DLgAb4n7rhZwf0vMbFWERe9PiIpXxCGO5dq8uhoR3a3FwATg/w640-h480/52.jpg" width="640" /></a></div><div style="text-align: justify;">A while ago I designed small <a href="https://beolover.com/products/microswitch-plastic-extension-for-beogram-4002-and-4004" target="_blank">Beolover 3D printed replacements</a>:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9UcENdUicFrgidDAdNedgRKnu6coD14UJYF1wsEsLHcuRCqjggaDYOppO3YSZ1V-R51XLlpDG6I5xv3EgVUupNgGB0EQ3Ner9Yz7WagfDRULaX6hov2dH_XLBz-2_rWMMA7thTc7kLpgYV1BK73y0-gHmKLAhyna6VhCpZg6j-40PPuKAEbajXSg1wj8/s1200/53.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9UcENdUicFrgidDAdNedgRKnu6coD14UJYF1wsEsLHcuRCqjggaDYOppO3YSZ1V-R51XLlpDG6I5xv3EgVUupNgGB0EQ3Ner9Yz7WagfDRULaX6hov2dH_XLBz-2_rWMMA7thTc7kLpgYV1BK73y0-gHmKLAhyna6VhCpZg6j-40PPuKAEbajXSg1wj8/w640-h480/53.jpg" width="640" /></a></div><div style="text-align: justify;">They are glued on with epoxy and restore the original functionality:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcj3v45iz8Cvpu9xDRugKlKIGW2ELTShpvcf9GY-UMEgyAy8aH5YsceaQmqiSKApAHKPhc62xIzVbRevmMq9V-Mdt205yat6zlO8nkvNXGWz6KKjQEhSUN-JQ30apqeAN5sBSqytUgMvbxuyEnLgA5dYuGEzuofaI0M2jzfYgV1FG7rlowqqxG85zDEME/s1200/54.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgcj3v45iz8Cvpu9xDRugKlKIGW2ELTShpvcf9GY-UMEgyAy8aH5YsceaQmqiSKApAHKPhc62xIzVbRevmMq9V-Mdt205yat6zlO8nkvNXGWz6KKjQEhSUN-JQ30apqeAN5sBSqytUgMvbxuyEnLgA5dYuGEzuofaI0M2jzfYgV1FG7rlowqqxG85zDEME/w640-h480/54.jpg" width="640" /></a></div><div style="text-align: justify;">This deck still had another issue which needed to be addressed: One of the mounting pieces that hold the RPM panel in place had cracked. This happens when the RPM panel is pried out at an angle:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjCmoMb6FNXOL-3v_2HRw0Yphg-w_OPypvBWFhD02MeXXoYFUW3wQ14edJc2RIH5ajgLXhRjiWmoDjYKfIWnuYb4fVOll-IdD8A6SRN2WsxnRjri7jHgKZ9ZdaKE1KPxY061BSIqty_-11nB8X_bBjLkEHMPnhMrki4g9ZuDwbKnH_kV5bkttm69VF8YxE/s1200/55.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjCmoMb6FNXOL-3v_2HRw0Yphg-w_OPypvBWFhD02MeXXoYFUW3wQ14edJc2RIH5ajgLXhRjiWmoDjYKfIWnuYb4fVOll-IdD8A6SRN2WsxnRjri7jHgKZ9ZdaKE1KPxY061BSIqty_-11nB8X_bBjLkEHMPnhMrki4g9ZuDwbKnH_kV5bkttm69VF8YxE/w640-h480/55.jpg" width="640" /></a></div><div style="text-align: justify;">Luckily there are reproductions available at the Beoparts-shop in Denmark. All you need to do is remove the springs from the original cracked part</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0Z18YOr6aWNb-6nrgjGePKMqdcznAUNGoQMI_DaWWHPgz76FxkXQOZjm7sMeQlqGV5vPbvm6nK44hlfZse3uZcT95M_eHCEDtik9i5mRPD_HXpAF5ykvqK6OHjkpEr1i5BJCrZ5Vryk-JXoDoS4xrAhV-4LTg9SkvNWrWfjGV5zKNK0u5RFk5Mx1tpvo/s1200/56.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0Z18YOr6aWNb-6nrgjGePKMqdcznAUNGoQMI_DaWWHPgz76FxkXQOZjm7sMeQlqGV5vPbvm6nK44hlfZse3uZcT95M_eHCEDtik9i5mRPD_HXpAF5ykvqK6OHjkpEr1i5BJCrZ5Vryk-JXoDoS4xrAhV-4LTg9SkvNWrWfjGV5zKNK0u5RFk5Mx1tpvo/w640-h480/56.jpg" width="640" /></a></div><div style="text-align: justify;">and transfer them to the new one:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjt7hpasGTGIm4czRDoEYY0BV_RIUD2Ou7UZlvbA_aWSg2xHKhqRiQvy5-jmmC0QklSf6iMa_Z43I3CkEwPq4r1DWWXkAgsDUlNAFItMCAR4b0FtFv6I19F9Gv25SguDd768IwRcti4vHRGFvP9VOvX9Fr-kioMxUJwchsTl7ZQ3sGN2L6cc2RJlkPWUrM/s1200/57.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjt7hpasGTGIm4czRDoEYY0BV_RIUD2Ou7UZlvbA_aWSg2xHKhqRiQvy5-jmmC0QklSf6iMa_Z43I3CkEwPq4r1DWWXkAgsDUlNAFItMCAR4b0FtFv6I19F9Gv25SguDd768IwRcti4vHRGFvP9VOvX9Fr-kioMxUJwchsTl7ZQ3sGN2L6cc2RJlkPWUrM/w640-h480/57.jpg" width="640" /></a></div><div style="text-align: justify;">After this was settled it was time to do the mechanical adjustments. First I adjusted the platter to be at the proper distance to the arms and parallel to their motion path. The next step was adjusting the floating chassis to yield a platter flush with the aluminum panels. This can take a few iterations since there is only little leeway for these adjustments due to the elegant flat design of the Beograms.</div></div><div><div style="text-align: justify;">Once these basic adjustments are achieved, the arm lowering limit can be adjusted:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4lhxOTTdHU_iFdrKNP-WcwNKh_l5qn4kSZ5pcqpSWF90Ca3_ZihzlEG09Iio2eSv0M9QPegAxlds0aj_9I9R6IXpa0CirIHUas0MWp_16OMz2OMKIuzrEnrYq6MKcty9Mi2-nxpJ4DXdqtXvwO42YZ_a7Zu0igvWOAwzNgZwyaPN-DACbtUAmf72SaDY/s1200/57a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4lhxOTTdHU_iFdrKNP-WcwNKh_l5qn4kSZ5pcqpSWF90Ca3_ZihzlEG09Iio2eSv0M9QPegAxlds0aj_9I9R6IXpa0CirIHUas0MWp_16OMz2OMKIuzrEnrYq6MKcty9Mi2-nxpJ4DXdqtXvwO42YZ_a7Zu0igvWOAwzNgZwyaPN-DACbtUAmf72SaDY/w640-h480/57a.jpg" width="640" /></a></div><div style="text-align: justify;">The needle should be about 1 mm above the lower segments of the platter ribs when the arm is lowered. An important safeguard to protect the needle should the arm ever be lowered due to a sensor malfunction.</div></div><div><div style="text-align: justify;">Next came the adjustment of the tracking feedback:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0WBTmQ4mgFPymGYEjUUtJTP3-QyEVR8jM8pDiOuj58QyBixVnG9K3VlqTBba_0VSLgzcNtZAfP2uwiONN0D70uSoUMvs5aMadocY018QIVF62t7BxFKRQFbAqj12eAzrEQno_hkXAgdtbGBhhqjhMPP1wzOeNOK7sZchOW6MNX3SYPmOyO4QraxdSM54/s1200/57b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0WBTmQ4mgFPymGYEjUUtJTP3-QyEVR8jM8pDiOuj58QyBixVnG9K3VlqTBba_0VSLgzcNtZAfP2uwiONN0D70uSoUMvs5aMadocY018QIVF62t7BxFKRQFbAqj12eAzrEQno_hkXAgdtbGBhhqjhMPP1wzOeNOK7sZchOW6MNX3SYPmOyO4QraxdSM54/w640-h480/57b.jpg" width="640" /></a></div><div style="text-align: justify;">Then I adjusted the bias of the sensor transistor to the specified 4V:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgl87AKVs_DI3CUhs4uHo3iXyCpqpqiuelK8ng6tv7p8L0GZ0eXtxGePz4zMsqSXsHMsvIiC_tMoqsoOviOZA2_ImsJxXtOhBdOBIt1bUuCXFYDBh2y67hRTFDgOuGPG78m92-45pXqhHFKeeID6OgPtAwXkwFbTnJmFMZx_x2ynE-ZP-dmfrTCmqKo1_k/s1200/58.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgl87AKVs_DI3CUhs4uHo3iXyCpqpqiuelK8ng6tv7p8L0GZ0eXtxGePz4zMsqSXsHMsvIiC_tMoqsoOviOZA2_ImsJxXtOhBdOBIt1bUuCXFYDBh2y67hRTFDgOuGPG78m92-45pXqhHFKeeID6OgPtAwXkwFbTnJmFMZx_x2ynE-ZP-dmfrTCmqKo1_k/w640-h480/58.jpg" width="640" /></a></div><div style="text-align: justify;">After moving the adjusted trimmer to the component side, I checked the sensor response with the oscilloscope. This is the signal obtained at the collector of the sensor transistor:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKVXUj2L-YTY1nPNVKHSqgCQsbhpburNUc6t3swig0tY6AOTvkYhYCg6PYkKChutgZq-lIVBGQ3xj8iUk0btEQVLIHTv1awkVho0JqC_OLEXbJgDEDCQP8GIIZNoB2scTkDhQk1jaSIeh8aw54SecNsyo5KqNAZowHZKPdVK-JZGrqlQ-68rfimYClcik/s1200/59.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjKVXUj2L-YTY1nPNVKHSqgCQsbhpburNUc6t3swig0tY6AOTvkYhYCg6PYkKChutgZq-lIVBGQ3xj8iUk0btEQVLIHTv1awkVho0JqC_OLEXbJgDEDCQP8GIIZNoB2scTkDhQk1jaSIeh8aw54SecNsyo5KqNAZowHZKPdVK-JZGrqlQ-68rfimYClcik/w640-h480/59.jpg" width="640" /></a></div><div style="text-align: justify;">The amplitude should be close to 5V. This sensor performed very well.</div></div><div style="text-align: justify;"><br /></div><div><div style="text-align: justify;">At this point the bubbling of the oil infusing bearings had finally stopped, so I extracted them from the oil</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjW9WF4XVaXq9oZlyHBrrEYPLu29BwqmOgcWMU3GIMv1XbgDtmMowRHVpW4vfOsRakcp5AFxpHZ2JCkgkys1y7VKoMOCpsE209fU-xz-8YoEzE1fGf3f60BqYDsSa_oL0Q0R-TYHry4BDO4G5K4nhFoJ6bhDrJpIUKnpAAyP27XWNJz9FNqtsbxtL-Y6D0/s1200/60.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjW9WF4XVaXq9oZlyHBrrEYPLu29BwqmOgcWMU3GIMv1XbgDtmMowRHVpW4vfOsRakcp5AFxpHZ2JCkgkys1y7VKoMOCpsE209fU-xz-8YoEzE1fGf3f60BqYDsSa_oL0Q0R-TYHry4BDO4G5K4nhFoJ6bhDrJpIUKnpAAyP27XWNJz9FNqtsbxtL-Y6D0/w640-h480/60.jpg" width="640" /></a></div><div style="text-align: justify;">and put them back into the motor. After installing the restored motor into the Beogram it was time to do a 24 hrs RPM stability test with the <a href="https://beolover.com/products/beoloverrpm-precise-rpm-calibration-for-your-beogram" target="_blank">new BeoloverRPM device</a>:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWLA-EKYjk_iWn-4PVQzi-ZJdQHzcQZ_A3i44YOq6fcMPGXVo-_9noqVtXRxqzSALpl9QU6XkNdzeGhQTHOCuhAViHiXKX4USTStZvQXh6EJV016-EGEiErEjZphoO4RO13u64Mm4gwNqLf3dXkYX-hHF6eUCuruMT8JrpI1WZkkajwY-hx3VTlIDjcNk/s1200/61.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="675" data-original-width="1200" height="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWLA-EKYjk_iWn-4PVQzi-ZJdQHzcQZ_A3i44YOq6fcMPGXVo-_9noqVtXRxqzSALpl9QU6XkNdzeGhQTHOCuhAViHiXKX4USTStZvQXh6EJV016-EGEiErEjZphoO4RO13u64Mm4gwNqLf3dXkYX-hHF6eUCuruMT8JrpI1WZkkajwY-hx3VTlIDjcNk/w640-h360/61.jpg" width="640" /></a></div><div style="text-align: justify;">In its 'slow' mode, the BeoloverRPM allows logging the RPM in 10s installments for long periods of time, which is perfect for detecting intermittent RPM inconsistencies.</div></div><div style="text-align: justify;">This is a graph of the 24 hrs measurement:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-ysvOTom_qiNCkMoh_Ix4gCDk_RuDRw4pOJd1Pqq7whXX8mkPYs_OqrSXaLxHKdLhyzpArgswDKUrO2jrL6XRmbHv1cLzqGczu-S5QiI-CPjJ6-zJFKonbKtaL36mTYePywXoyyNdngTdAz1YG3sxeKSVb57l3ezAbJ20-ET7_Hc__iRaJNNdKcZsSDY/s1024/Beogram%204002%20RPM%20Stability.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="593" data-original-width="1024" height="370" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-ysvOTom_qiNCkMoh_Ix4gCDk_RuDRw4pOJd1Pqq7whXX8mkPYs_OqrSXaLxHKdLhyzpArgswDKUrO2jrL6XRmbHv1cLzqGczu-S5QiI-CPjJ6-zJFKonbKtaL36mTYePywXoyyNdngTdAz1YG3sxeKSVb57l3ezAbJ20-ET7_Hc__iRaJNNdKcZsSDY/w640-h370/Beogram%204002%20RPM%20Stability.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">This result is pretty much as good as it gets with DC motor 4002s. The slow longterm drift is a result of temperature changes that affect the feedback circuitry.</div><div style="text-align: justify;"><br /></div><div><div style="text-align: justify;">In 'fast' mode the BeoloverRPM device shows the raw data and one can see the typical repeating 'platter pattern' that is a result of the small distance variations between the platter ribs, i.e. the pattern repeats every 24 data points:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjDO0izLrZqDTHjlgkbcsaAFLD4vXFzmqLYfewbJkCkR7KRV5xTTUfGgK315wcu0Us9aCA5m6Yy5JSDAodKGV_8MfDWyRzkS8iOC8eRpx24d5ifwFLe-dhMFgGsaZoHRrzZSsdg2gNWzq2S94DMB4mEHYwCI6P3A4ol-ZFD5sYYbV5rPM0lfL0dzz6tKDA/s1200/62.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="675" data-original-width="1200" height="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjDO0izLrZqDTHjlgkbcsaAFLD4vXFzmqLYfewbJkCkR7KRV5xTTUfGgK315wcu0Us9aCA5m6Yy5JSDAodKGV_8MfDWyRzkS8iOC8eRpx24d5ifwFLe-dhMFgGsaZoHRrzZSsdg2gNWzq2S94DMB4mEHYwCI6P3A4ol-ZFD5sYYbV5rPM0lfL0dzz6tKDA/w640-h360/62.jpg" width="640" /></a></div><div style="text-align: justify;">This measurement artifact is the main reason for the noise observed in the longterm spectra.</div></div><div style="text-align: justify;">A fast-mode measurement covering about 47 platter rotations also reveals the action of the feedback mechanism that keeps the RPM constant:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgAm_hGmb20644owe-_KoUBStDF-QLYF2NgNvYR22F5ntK4WYJSFyLM676AEoRylkqSp83PUyU8TScyAjNFPyuzySzJ_uANQpoV16fY5DHlAbaECB3X2L1lD3rzTRGnPS3vZrECnd86jDm2q-pDMH7uq5DCK_hHfvYOuIBEnY8zpfv3865gQ5g9cfb-2hg/s858/Beogram%204002%20RPM%20detail.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="597" data-original-width="858" height="446" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgAm_hGmb20644owe-_KoUBStDF-QLYF2NgNvYR22F5ntK4WYJSFyLM676AEoRylkqSp83PUyU8TScyAjNFPyuzySzJ_uANQpoV16fY5DHlAbaECB3X2L1lD3rzTRGnPS3vZrECnd86jDm2q-pDMH7uq5DCK_hHfvYOuIBEnY8zpfv3865gQ5g9cfb-2hg/w640-h446/Beogram%204002%20RPM%20detail.jpg" width="640" /></a></div><div style="text-align: justify;">The beating pattern is a result of the superposition between the repeating 'platter pattern' and sinusoidal RPM changes caused by the feedback system. Beating phenomena occur when two waves of slightly different frequencies interfere with each other, creating a periodic variation known as a 'beat'. In this case it means that the feedback system varies the RPM a bit slower than the platter rotation. All feedback controlled brushed DC motors operate in this way, i.e. control electronics correct the speed based on an RPM measurement. When the motor is too slow, the voltage is increased a bit, causing it to accelerate, and when it is too fast the voltage is reduced causing a slowdown. This results in a periodic variation of the RPM. Optimization of the feedback circuit tries to minimize the ups and downs, but they can not be completely eliminated.</div></div><div><div style="text-align: justify;">After this excursions into physics it was time to replace the somewhat messy original DIN5 plug:</div><div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfWhPB8Dm4nfws5yExoGLOuJuH3_l5lvHzHf2OjaovDvcOAWcdmhdVX7ziWdHk47Dcvmg23CgZbSx5Nq8m9aA9T8nINZr2PvEYSqZIhF4dBDpf54QPogc0c5A3Jp3VpxRYYBeVLEg7lXDl2d9bGf1Ic4ZGP0gjCk98hqyc7bqMZ4voo6WbD2_BJS4q8DE/s1200/63.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjfWhPB8Dm4nfws5yExoGLOuJuH3_l5lvHzHf2OjaovDvcOAWcdmhdVX7ziWdHk47Dcvmg23CgZbSx5Nq8m9aA9T8nINZr2PvEYSqZIhF4dBDpf54QPogc0c5A3Jp3VpxRYYBeVLEg7lXDl2d9bGf1Ic4ZGP0gjCk98hqyc7bqMZ4voo6WbD2_BJS4q8DE/w640-h480/63.jpg" width="640" /></a></div><div style="text-align: justify;">I installed a nice new all-metal plug with gold plated contact pins:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivDNMJxxEzPoqvHwwVEZCUda-MEzQqdglwdcKkPiIDyClZCrJkLWjEwL7PO4LWdOsPGbkEk3sxg0fOgaDnN_9Hpb-5fZ1Z6QDI74HXesTgmFKJRs_hzdBrBqcVbxUxdAeyC6yu-jxGpI-UbM-Dy73SEj5hmfvpPIlCU0vIP3k2KvSYWjpqUyjpQ-DxeJs/s1200/64.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivDNMJxxEzPoqvHwwVEZCUda-MEzQqdglwdcKkPiIDyClZCrJkLWjEwL7PO4LWdOsPGbkEk3sxg0fOgaDnN_9Hpb-5fZ1Z6QDI74HXesTgmFKJRs_hzdBrBqcVbxUxdAeyC6yu-jxGpI-UbM-Dy73SEj5hmfvpPIlCU0vIP3k2KvSYWjpqUyjpQ-DxeJs/w640-h480/64.jpg" width="640" /></a></div><div style="text-align: justify;">Beolovely! And finally it was time for a test spin of this restored Beogram 4002! I selected one of my favorite records, <a href="https://www.discogs.com/master/122795-George-Duke-The-Aura-Will-Prevail" target="_blank">"The Aura Will Prevail" by George Duke</a>. He recorded this for the German MPS label in 1975. Of course this lovely vintage album was cleaned ultrasonically on a <a href="https://www.cleanervinyl.com/proxl.html" target="_blank">CleanerVinyl ProXL setup</a>, which removed most crackling and restored its sound to its original glory. </div></div><div><div style="text-align: justify;">A perfect combination! As expected this Beogram played the record perfectly!</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFnpED1y3J80eQpmVIaNI7N30f-LNCQoqh2I4vcGLaeLJb4w3aXHYNsW-xXUiSnChhDKe8Tpre4IaAbJJNJdICCXZ1hHfh7-lc_5LsbJ91sMG8pe4U5szWcXX2DCt4LYyRtYFoBGB8TdOhG_hbV0f-xhwNrKX61SzjnVo8JjhYiClFPqHx2AmQjentYtE/s1200/65.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="948" data-original-width="1200" height="506" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFnpED1y3J80eQpmVIaNI7N30f-LNCQoqh2I4vcGLaeLJb4w3aXHYNsW-xXUiSnChhDKe8Tpre4IaAbJJNJdICCXZ1hHfh7-lc_5LsbJ91sMG8pe4U5szWcXX2DCt4LYyRtYFoBGB8TdOhG_hbV0f-xhwNrKX61SzjnVo8JjhYiClFPqHx2AmQjentYtE/w640-h506/65.jpg" width="640" /></a></div><div style="text-align: justify;">Next came the restoration of the hood, which needed an in-depth polishing:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyqnOcJtvJs0qqM1D6Vi1ZBF-RZBDZ0YcPzAF5MCjKLvXC15FwcwTeIW9XLXhLUhyphenhyphenN5iprcTUUNA2mFCyq2wthF0dZLLhS2gZEjHwBxu8HKC1SD0gDyYWT1M7ovhRyuWi7VwkU8P9a94FuKYw9YNE1ZYYocwPrn7KtjQlmdTM6_fR5mVM-llbPvfUGMoY/s1200/66.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyqnOcJtvJs0qqM1D6Vi1ZBF-RZBDZ0YcPzAF5MCjKLvXC15FwcwTeIW9XLXhLUhyphenhyphenN5iprcTUUNA2mFCyq2wthF0dZLLhS2gZEjHwBxu8HKC1SD0gDyYWT1M7ovhRyuWi7VwkU8P9a94FuKYw9YNE1ZYYocwPrn7KtjQlmdTM6_fR5mVM-llbPvfUGMoY/w640-h480/66.jpg" width="640" /></a></div><div style="text-align: justify;">I sanded it down with 400 grit paper until all the scratches were evened out:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgERVDNGL8bmNUOAM-JGsHPU5Sy0xBZJbMooClpnLqpETPAvF81P7s6W43FudJ0Ml_jkEy-Te75lCvIluhYL5_mXjdYFG62ktT7SnRQES2jN4KMrk8m5uAvfW9u3pygRIcGCrT6G0mXjt6p0NyawuvQ466bFz8-xun7JOv9WiT1KBiWoynuze6AaAOAlIk/s1200/67.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="801" data-original-width="1200" height="428" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgERVDNGL8bmNUOAM-JGsHPU5Sy0xBZJbMooClpnLqpETPAvF81P7s6W43FudJ0Ml_jkEy-Te75lCvIluhYL5_mXjdYFG62ktT7SnRQES2jN4KMrk8m5uAvfW9u3pygRIcGCrT6G0mXjt6p0NyawuvQ466bFz8-xun7JOv9WiT1KBiWoynuze6AaAOAlIk/w640-h428/67.jpg" width="640" /></a></div><div style="text-align: justify;">Then I polished it back with ever finer girt until it was nice and shiny again:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjknbi8df-SBSJrpXK2LavkMLCxlcCEw25FL_fmPwip28uqgM3YxtJ-HsGEGu-jvF4TJfzVMXwuL5_e5JMpYSFi9V-n5HzevQJkrSbgYdW2wtPxFDCoRXAaYnvLMX9l7SqjLQgVr6C6ZyqTruqfWBjMUST2GpvolQsEukCZMrTkshuf-ir5JyGriQgQXj8/s1200/68.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjknbi8df-SBSJrpXK2LavkMLCxlcCEw25FL_fmPwip28uqgM3YxtJ-HsGEGu-jvF4TJfzVMXwuL5_e5JMpYSFi9V-n5HzevQJkrSbgYdW2wtPxFDCoRXAaYnvLMX9l7SqjLQgVr6C6ZyqTruqfWBjMUST2GpvolQsEukCZMrTkshuf-ir5JyGriQgQXj8/w640-h480/68.jpg" width="640" /></a></div><div style="text-align: justify;">The final step was installing new rubber bumpers ensuring a solid 'plop' when the hood is dropped onto the plinth. First I drilled out the remnants of the original bumpers:</div></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjQm74krul3ERfkSzGttCmCir1O9FlEewg46Pu8xdW5XYPNSUZJiZ7-pw8Gr6hVufDkoM5OwWozp_s5Nvan0HpYCZ6hP2PreOIvrWi_K07-IpLpKqMI6QwW5SQlQPrlIJLs9KAgtZ8OfHC1HhvkpW3Zs7ApkqV5JKWLfcp51gAeiR-iMRVJG7b9Xm2MKog/s1200/69%20Beogram%204002%20hood%20drilling%20out%20bumper.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjQm74krul3ERfkSzGttCmCir1O9FlEewg46Pu8xdW5XYPNSUZJiZ7-pw8Gr6hVufDkoM5OwWozp_s5Nvan0HpYCZ6hP2PreOIvrWi_K07-IpLpKqMI6QwW5SQlQPrlIJLs9KAgtZ8OfHC1HhvkpW3Zs7ApkqV5JKWLfcp51gAeiR-iMRVJG7b9Xm2MKog/w640-h480/69%20Beogram%204002%20hood%20drilling%20out%20bumper.jpg" width="640" /></a></div><div style="text-align: justify;">Then I glued snippets of a 2 mm O-ring into the holes</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicIP1HNA5ipniFThEwwz5jVJ4pMGsZBTfEBGHOnlm-1Rno43WqDIpKNfKYyM9_UX_jgs5oeFYqxD_r_7fu4BKOfYi0YhWYROCik6eoqxwy2iStYq8LqZK356yBnzEoDKDba45M0xoJRVH1UA5lOsUFuB_52ArFcuMsXV2PLCI_4z_uSE0_Rq-FIxJolDg/s1200/70%20Beogram%204002%20hood%20installing%20o-ring%20snippet.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicIP1HNA5ipniFThEwwz5jVJ4pMGsZBTfEBGHOnlm-1Rno43WqDIpKNfKYyM9_UX_jgs5oeFYqxD_r_7fu4BKOfYi0YhWYROCik6eoqxwy2iStYq8LqZK356yBnzEoDKDba45M0xoJRVH1UA5lOsUFuB_52ArFcuMsXV2PLCI_4z_uSE0_Rq-FIxJolDg/w640-h480/70%20Beogram%204002%20hood%20installing%20o-ring%20snippet.jpg" width="640" /></a></div><div style="text-align: justify;">and trimmed them to 1 mm length after the glue was dried:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtHbD_YQWdd1BRDCUtOxt2TjoHg2bnTI6cBTRSS3rxm7fjCexCRr_VCpMLY3LDyOH92AeCShRsQeNa9nRu4zqnT9qFfX-vTn-1_O8zkooKuCPoSGzQrcXm4jrk61Wh6ISD62Q_HxJc6-ZNnP3EmBTYJ4hrdY3J2oHg60TBZkjjAD7h1TdvTdAcjA_7I6I/s1200/71%20Beogram%204002%20hood%20bumpers%20restored.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtHbD_YQWdd1BRDCUtOxt2TjoHg2bnTI6cBTRSS3rxm7fjCexCRr_VCpMLY3LDyOH92AeCShRsQeNa9nRu4zqnT9qFfX-vTn-1_O8zkooKuCPoSGzQrcXm4jrk61Wh6ISD62Q_HxJc6-ZNnP3EmBTYJ4hrdY3J2oHg60TBZkjjAD7h1TdvTdAcjA_7I6I/w640-h480/71%20Beogram%204002%20hood%20bumpers%20restored.jpg" width="640" /></a></div><div style="text-align: justify;"><br /></div><div><div style="text-align: justify;">And this concluded the restoration of this lovely Beogram 4002! I will now play it for 1-2 weeks to make sure it has no intermittent issues. Then it will be time to send it back to its owner in Texas!</div><p><br /></p></div></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-25115533382919767992024-03-05T11:13:00.003-05:002024-03-05T11:30:56.683-05:00Beogram 5500 Type 5943: Replacing the Transport Chassis 1106 Base<p> In order to get this Beogram 5500 functional again the bottom part of the tangential arm assembly chassis (1106) must be replaced.<br /><br />At the end of the <a href="https://beolover.blogspot.com/2024/03/beogram-5500-type-5943-as-received.html" target="_blank">previous post</a> I showed photos of this Beogram 5500 chassis and the photos revealed a broken tab necessary for the arm control string to connect to. Without that tab the Beogram 5500 tangential arm assembly cannot operate.</p><p>The first step in replacing the bottom section of chassis 1106 is to remove the arm assembly from the guide rails.<br /><br />There are two rails that I lifted up on one end and slid out to remove.</p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0kfPsMVugy_pU657EvEP0EZy0ZKB37xMb06xvQYqvkQydQVZ5kp7vr4S5xSQqJWtwtZ9mnHfXZwQFhE2O4AtTniwMYfCCd-O0PtNxV5cjvoSShEsU9fICmRHs1zCUlIUVllNUna3wH4V0-wYuY3yXx36l3fhozbACOZRUEHIRU0WiFimwrVlaZ60ESaua/s2200/bg3000_5903_kt_tangential_arm_removal_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="914" data-original-width="2200" height="266" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0kfPsMVugy_pU657EvEP0EZy0ZKB37xMb06xvQYqvkQydQVZ5kp7vr4S5xSQqJWtwtZ9mnHfXZwQFhE2O4AtTniwMYfCCd-O0PtNxV5cjvoSShEsU9fICmRHs1zCUlIUVllNUna3wH4V0-wYuY3yXx36l3fhozbACOZRUEHIRU0WiFimwrVlaZ60ESaua/w640-h266/bg3000_5903_kt_tangential_arm_removal_01.jpg" width="640" /></a></div><br /><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p><br /><br /><br />A view of the back of the arm assembly shows a spring (for arm lowering and raising) that will have to be removed.<br /></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjdOY6jLzVSFK93puQkvgisOX09LBWcM9SBhcqbS0bk-hv5m9O5rzZ8h9vUtxIhlNntWExVRJ7g0pav-kcqZOenKEgHzEsEmUmX38I9IO9FzZumjmfoFuFaLJZhaVz83x_Z_kWuOYanQ_wBH5i4wpzjpRuWKBjJfcr1AO6oNDngyJaz5CQ15ie55HPnuWvb/s2200/bg3000_5903_kt_tangential_arm_removal_02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1557" data-original-width="2200" height="452" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjdOY6jLzVSFK93puQkvgisOX09LBWcM9SBhcqbS0bk-hv5m9O5rzZ8h9vUtxIhlNntWExVRJ7g0pav-kcqZOenKEgHzEsEmUmX38I9IO9FzZumjmfoFuFaLJZhaVz83x_Z_kWuOYanQ_wBH5i4wpzjpRuWKBjJfcr1AO6oNDngyJaz5CQ15ie55HPnuWvb/w640-h452/bg3000_5903_kt_tangential_arm_removal_02.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br /><br /><br /><br /><br /><br /><br /><br />Having removed the guide rails, the tangential arm assembly can be lifted and turned to access other parts that will have to be disassembled.<br /><br />A nice part about this design is that the phono audio cables can be detached from the base of the arm assembly without having to de-solder or disturb the phono cable connections.</div><div><br /></div><div>As this photo shows, the phono cables are fitted around the chassis 1106 base so they just need to be maneuvered out of their slots.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-5od1avPluexHKEh61H16_DxGPSBUrRRy1IZPCGOCAOF1L5gh8fbAqREEmJCxEU5Vvmryq2r-bmdoLpF8dYbeXTAbUODF3CmA4Q50ndsqU_fICPi6U94b98YFTeLod39tN1KzzhYg4B1_7iJm23GnlmJpzkvKcgA1-9AMbji_Ozkp7ELi9NlRrR7daNut/s2200/bg3000_5903_kt_tangential_arm_removal_03.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi-5od1avPluexHKEh61H16_DxGPSBUrRRy1IZPCGOCAOF1L5gh8fbAqREEmJCxEU5Vvmryq2r-bmdoLpF8dYbeXTAbUODF3CmA4Q50ndsqU_fICPi6U94b98YFTeLod39tN1KzzhYg4B1_7iJm23GnlmJpzkvKcgA1-9AMbji_Ozkp7ELi9NlRrR7daNut/w640-h480/bg3000_5903_kt_tangential_arm_removal_03.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />There are also two screws at the base of the chassis that must be removed so the bottom piece of 1106 can be removed.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiziBFO27nJYPzRkm-MP2j_Si14sKK_v2zw5Wwde4kdzi-Fle8IDOcxJkEGSt7ChPrCgVEPRzLGuPckdQ7QvF2c0yPPShh2wTdF0fWum_C3Ogud-lt0lePAuwZocFKKRvOeKcV-1q52FOVHbdSDxMesyFs6IFqvzA6y9q_hH83O7yPOXb4x9dNYDhWj6hyphenhyphenn/s2200/bg3000_5903_kt_tangential_arm_removal_04.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiziBFO27nJYPzRkm-MP2j_Si14sKK_v2zw5Wwde4kdzi-Fle8IDOcxJkEGSt7ChPrCgVEPRzLGuPckdQ7QvF2c0yPPShh2wTdF0fWum_C3Ogud-lt0lePAuwZocFKKRvOeKcV-1q52FOVHbdSDxMesyFs6IFqvzA6y9q_hH83O7yPOXb4x9dNYDhWj6hyphenhyphenn/w640-h480/bg3000_5903_kt_tangential_arm_removal_04.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br /><br /><br /><br /><br /><br />...and here is the tangential arm assembly ready for the bottom (white piece) to be pulled off.<br /><br />You can see that the phono cables are out of the way.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEho64LFwMIKNBLZVP2a3C615yR5LSwl38fW9AzBkez3kfVc1Tfpd453uDkNgwqmhjivNL9iYcLkQWBq0R3V5NRx_x6HHulBkFxeBShJf1jFODM3G-pPDDOxHGIgYdj9eeR12LnqPmw44u3c_awd8tORnRxecv-lOQH1Oul_dAGxCiFb2cRUUjaK14qqM6au/s2200/bg3000_5903_kt_tangential_arm_removal_05.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEho64LFwMIKNBLZVP2a3C615yR5LSwl38fW9AzBkez3kfVc1Tfpd453uDkNgwqmhjivNL9iYcLkQWBq0R3V5NRx_x6HHulBkFxeBShJf1jFODM3G-pPDDOxHGIgYdj9eeR12LnqPmw44u3c_awd8tORnRxecv-lOQH1Oul_dAGxCiFb2cRUUjaK14qqM6au/w640-h480/bg3000_5903_kt_tangential_arm_removal_05.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Here is the bottom piece of chassis 1106 removed.<br /><div class="separator" style="clear: both; text-align: center;"><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirTECk3gOjCYeZraQwWoHG6JDQ3fbrYsj61e8Vx03ga1h-AgwlgZliXHNc3RrlQ68rBH04TC6QmhMYKO9vGwDcN9SperDdZLiBuLf0zBCCv_YR_aXhYNnF6dDcKg161TqSdDVg4-RTWQoD_h-YwHUbwcwxwyGmeWbYi98UjCrBz_2EwZm_d9lnDG4DKwjT/s2200/bg3000_5903_kt_tangential_arm_removal_06.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1615" data-original-width="2200" height="470" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirTECk3gOjCYeZraQwWoHG6JDQ3fbrYsj61e8Vx03ga1h-AgwlgZliXHNc3RrlQ68rBH04TC6QmhMYKO9vGwDcN9SperDdZLiBuLf0zBCCv_YR_aXhYNnF6dDcKg161TqSdDVg4-RTWQoD_h-YwHUbwcwxwyGmeWbYi98UjCrBz_2EwZm_d9lnDG4DKwjT/w640-h470/bg3000_5903_kt_tangential_arm_removal_06.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Again, here are the old and the replacement chassis 1106 bottom pieces to show the mounting tab for the tangential arm guide string.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhfF2mtm1Uj_fLHGldxkZ1kBYiGoBl1A6PPQCxevnlVqqxCiYlov1ozxRlp5-N-FQ4_lfVIZ7F6OQYnPd7nz7LB_bhfAnTv9EieZ9OF63WBTgYQFg4ZO8tReN45CHP7gOD294u1qlf83DWxZHysXSSArCq5otSoxFb_ECYtc2iustRygLdYRuAzS03-CRsU/s2200/bg3000_5903_kt_tangential_arm_removal_07.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhfF2mtm1Uj_fLHGldxkZ1kBYiGoBl1A6PPQCxevnlVqqxCiYlov1ozxRlp5-N-FQ4_lfVIZ7F6OQYnPd7nz7LB_bhfAnTv9EieZ9OF63WBTgYQFg4ZO8tReN45CHP7gOD294u1qlf83DWxZHysXSSArCq5otSoxFb_ECYtc2iustRygLdYRuAzS03-CRsU/w640-h480/bg3000_5903_kt_tangential_arm_removal_07.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Reassembly with the new arm assembly base was just the reverse steps of the assembly.<br /><br />With the proper chassis 1106 base installed it was easy to attach the tangential arm guide string.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBrDZWKugH83cVs3rsNqFuXUhtZjkNcJonPR5_giwEpUR6tS72xsx_dOfRyV2cFLy_9tRU9DzARjxEUzWiP29GHItZKA0CplsQ-rH7jKQuDDH6NnsQFa7_k9zob8vfKxdeM-Lzj0SObcSBTigeTPBKn8iio0u0kN_OkvXvtFIcZsTNhbpDfg57XvHOlcoP/s2200/bg5500_5943_kt_as_received_08.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="949" data-original-width="2200" height="276" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBrDZWKugH83cVs3rsNqFuXUhtZjkNcJonPR5_giwEpUR6tS72xsx_dOfRyV2cFLy_9tRU9DzARjxEUzWiP29GHItZKA0CplsQ-rH7jKQuDDH6NnsQFa7_k9zob8vfKxdeM-Lzj0SObcSBTigeTPBKn8iio0u0kN_OkvXvtFIcZsTNhbpDfg57XvHOlcoP/w640-h276/bg5500_5943_kt_as_received_08.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4A43IXvfC2SN-s0ax2jDy810g7V4TEPiJ3g6dxKCAfS8sG4VNWvHNmUviyv1OECI-CwnsA2Z6iRwpF9Z8LYT_czfnhdXrkKdTHeGuc8L1efdwpvD0pPEEohraMbTu48ni3AB2dCMezYXL6ASEmkjtZ0pbmWoApYcPhs7FeAdyFvFqg-ZLVOXXNsTTtZTs/s2200/bg3000_5903_kt_tangential_arm_removal_08.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="888" data-original-width="2200" height="258" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4A43IXvfC2SN-s0ax2jDy810g7V4TEPiJ3g6dxKCAfS8sG4VNWvHNmUviyv1OECI-CwnsA2Z6iRwpF9Z8LYT_czfnhdXrkKdTHeGuc8L1efdwpvD0pPEEohraMbTu48ni3AB2dCMezYXL6ASEmkjtZ0pbmWoApYcPhs7FeAdyFvFqg-ZLVOXXNsTTtZTs/w640-h258/bg3000_5903_kt_tangential_arm_removal_08.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />I installed a new servo belt and tested that the tangential arm assembly is operational.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvvvj3NPlwuFwkcbiie4jl3eHYiJ6bzdDb-2M1jkJWWRf6GfANaglrU_VK1Tq12wHtKwkorB6deKlsWPO-L7rQgV7vwONZCvwpT7OKGmadPuvH3qrjrfasN4CTQMnigrA_yW09AeDoRwr62FoefVVS5d_KpwKd1jGsLkwnRgH_Rui7w08Hy-GGC1F0zLjl/s2200/bg3000_5903_kt_tangential_arm_removal_09.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvvvj3NPlwuFwkcbiie4jl3eHYiJ6bzdDb-2M1jkJWWRf6GfANaglrU_VK1Tq12wHtKwkorB6deKlsWPO-L7rQgV7vwONZCvwpT7OKGmadPuvH3qrjrfasN4CTQMnigrA_yW09AeDoRwr62FoefVVS5d_KpwKd1jGsLkwnRgH_Rui7w08Hy-GGC1F0zLjl/w640-h480/bg3000_5903_kt_tangential_arm_removal_09.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />The set down points of the tonearm for 17 cm and 30 cm records are a little off.<br />I will be going through the service manual adjustments for this Beogram 5500 next.sonavoraudiohttp://www.blogger.com/profile/04144547857529140916noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-28453094054094824442024-03-03T20:06:00.004-05:002024-03-03T20:13:07.326-05:00Beogram 5500 Type 5943: As Received<p> I recently opened up and examined a Beogram 5500 turntable audio component that goes with <a href="https://beolover.blogspot.com/2023/10/beomaster-5500-type-2333-reassembly-and.html" target="_blank">this Beomaster 5500 restoration</a> I did earlier.<br /><br />This Beogram 5500 does not function and appears to be dead.<br /></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVQfwnkVrfcUwxtrkyRKWOFsqwc73VpeDyKgUTmAupW2xIs6o7vafXqZr0J6NHP4MPpX-GeqdmaXEfnpbQTE3D09MPUf-QG1oxlu4Qmu7us7YpRkSs2B_60-PBMlhC3ERBSUFsJ3P4CbFxGQKdNqQfPKtFDQ2vVtVDHigYj2RlojY1iuuE7vMwxINGq3xS/s2200/bg5500_5943_kt_as_received_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVQfwnkVrfcUwxtrkyRKWOFsqwc73VpeDyKgUTmAupW2xIs6o7vafXqZr0J6NHP4MPpX-GeqdmaXEfnpbQTE3D09MPUf-QG1oxlu4Qmu7us7YpRkSs2B_60-PBMlhC3ERBSUFsJ3P4CbFxGQKdNqQfPKtFDQ2vVtVDHigYj2RlojY1iuuE7vMwxINGq3xS/w640-h480/bg5500_5943_kt_as_received_01.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br />Opening it into the service position I immediately saw a problem with the tangential arm assembly drive...the drive string was not connected.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiNATCr68g7mI3Alya3_BrPk5l51r_iSklgqU73UGUskzDKsEj8NuJRdAN4nvRk5HGvcWnGXB6JDnH2ZXYVHXyrVKCC8Wq2hdnS4_-pKa8LYXM9eK7j8WQthNwFJHIDA0tAPVGv9LT-xefGDvrRW3d79JY7FjYBCUeuTDl_5omFqFWdREolZLz7cWly3NzI/s2200/bg5500_5943_kt_as_received_02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiNATCr68g7mI3Alya3_BrPk5l51r_iSklgqU73UGUskzDKsEj8NuJRdAN4nvRk5HGvcWnGXB6JDnH2ZXYVHXyrVKCC8Wq2hdnS4_-pKa8LYXM9eK7j8WQthNwFJHIDA0tAPVGv9LT-xefGDvrRW3d79JY7FjYBCUeuTDl_5omFqFWdREolZLz7cWly3NzI/w640-h480/bg5500_5943_kt_as_received_02.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br /><br /><br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPOAm-KXfwiCeQc2RgNEvYhzcgOCy1q4gFlkNn0JpkslvNkSV8aHw9YTGxPEd2quptilA6XZhL2vrrf_VMoV-ub8Zc_LJ48AHSmxM3jxc9FiJ76xeVy9X6BC91qwEPqn6oFBlS3bioBjM1igtP55eoia_0OGJ6BIhS0Xzi35hH79WLC2Z_amfw4N6pfch6/s2200/bg5500_5943_kt_as_received_04.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPOAm-KXfwiCeQc2RgNEvYhzcgOCy1q4gFlkNn0JpkslvNkSV8aHw9YTGxPEd2quptilA6XZhL2vrrf_VMoV-ub8Zc_LJ48AHSmxM3jxc9FiJ76xeVy9X6BC91qwEPqn6oFBlS3bioBjM1igtP55eoia_0OGJ6BIhS0Xzi35hH79WLC2Z_amfw4N6pfch6/w640-h480/bg5500_5943_kt_as_received_04.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Both ends of the drive string are disconnected and a bit tangled.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixrAMMPUkPisXF369x5OMriV07H1aJoktvH6uMCA73YhGs3wyUlUsQLUeCY8973uLYA6HPtcto-lXeBxCj9lbxYSce7MbCfxacTWh6HLEMIaL7A25J905hZyerQX1VOlMXAtdhuWmR9NFO88hnIsNWcmIiFFNT0OFSbhZuVyNtpEjcDE_2QHWepeDa5MCy/s2200/bg5500_5943_kt_as_received_05.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixrAMMPUkPisXF369x5OMriV07H1aJoktvH6uMCA73YhGs3wyUlUsQLUeCY8973uLYA6HPtcto-lXeBxCj9lbxYSce7MbCfxacTWh6HLEMIaL7A25J905hZyerQX1VOlMXAtdhuWmR9NFO88hnIsNWcmIiFFNT0OFSbhZuVyNtpEjcDE_2QHWepeDa5MCy/w640-h480/bg5500_5943_kt_as_received_05.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br /><br /></div><div><br /></div><div><br /></div><div><br /><br /><br /><br />After sorting the drive string out and began to re-install it, I discovered a problem with the common mounting post for the two ends (Point H in the service manual diagram).<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEimc3c_iCp1LLVUnHZsBqV1sbws9_CQ5J942TR5OQ2eHRnMGKCUbxOr9XYSUlZTczc9BFRvsPVv-Juh7y0pdVms2s0ohqBBiyB9ojD1Qw-dYQk3YxPkxxWrneZ6_T2DAf-T8GnVhk8QN53OnJPFTpNPMQyrHmerG0mMkhoXU1TkdEVCTaVOVFufTiViKFU_/s2200/bg5500_5943_kt_as_received_06.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEimc3c_iCp1LLVUnHZsBqV1sbws9_CQ5J942TR5OQ2eHRnMGKCUbxOr9XYSUlZTczc9BFRvsPVv-Juh7y0pdVms2s0ohqBBiyB9ojD1Qw-dYQk3YxPkxxWrneZ6_T2DAf-T8GnVhk8QN53OnJPFTpNPMQyrHmerG0mMkhoXU1TkdEVCTaVOVFufTiViKFU_/w640-h480/bg5500_5943_kt_as_received_06.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3Xj4YsNHk6aHwRwZJH6iFN2QDLTIUdfwDiqoagqmC46XAlaAk-WmUbktRDDx-rsytLXJWLxyoNqeDzvHvDYaUNeeI4jhprwd0NHht-uYW2xbODhMXWFdE_MTmn_zYhbnrNIxCS1XlaHx5jApsbIJ9c8_lx83eiaDKxqLY1myIKqIFDlkcTgP8i271FAYT/s2200/bg5500_5943_kt_as_received_08.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="949" data-original-width="2200" height="276" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg3Xj4YsNHk6aHwRwZJH6iFN2QDLTIUdfwDiqoagqmC46XAlaAk-WmUbktRDDx-rsytLXJWLxyoNqeDzvHvDYaUNeeI4jhprwd0NHht-uYW2xbODhMXWFdE_MTmn_zYhbnrNIxCS1XlaHx5jApsbIJ9c8_lx83eiaDKxqLY1myIKqIFDlkcTgP8i271FAYT/w640-h276/bg5500_5943_kt_as_received_08.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Mounting post "H" is missing.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhv6HDBCj5Ow68ZRD2sv0w_H2f3fDwGqDoNIULkvRcJ9SdJCsXTIVb3u1NXyxOdJGkcnA6UsOF1tjxUaRYFqo3fLK7fPYYZ2a86Ux0MJbglXJOR9ZjVDmfnGBmcuWub9I6eTZLipUDUTolY2WcL-_v8-8J2tvJLWX24hBllOMW3WByybrT1egl_q7ocH6yE/s2200/bg5500_5943_kt_as_received_07.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhv6HDBCj5Ow68ZRD2sv0w_H2f3fDwGqDoNIULkvRcJ9SdJCsXTIVb3u1NXyxOdJGkcnA6UsOF1tjxUaRYFqo3fLK7fPYYZ2a86Ux0MJbglXJOR9ZjVDmfnGBmcuWub9I6eTZLipUDUTolY2WcL-_v8-8J2tvJLWX24hBllOMW3WByybrT1egl_q7ocH6yE/w640-h480/bg5500_5943_kt_as_received_07.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />It might be possible to make some sort of replacement but I do happen to have a parts unit Beogram 3000 Type 5903. It is in really bad shape and beyond restoration consideration. However, its internal parts are in good shape.<br /><br />Bang & Olufsen used this same internal Beogram assembly on quite a number of their tangential turntables (including the Beogram 3000 and 5500). I should be able take the white, plastic tangential arm assembly chassis (1106) from the Beogram 3000 and use it in the Beogram 5500.<br /><br />Here is a photo of the Beogram 3000 arm drive mount on its 1106 chassis.<br />It clearly shows the missing mounting post "H".<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXNygoLfehH00YfQeXWVPs5IGOzi2dDy3JawfgD-rQH2SoZ-H64zr7pVu1ZEcvuZvIyxCkFa2xCcPlb2LNPGW_pDlwxCvrl8W7UvINWstvv0SSi81C0E9fuZjkmHGaydCue0tNRh9Q1jQdh56z0nAs3yFMW0QAFp5VpUP86HIvJSgs-M1X4XUHF3_a2npW/s2200/bg3000_5903_kt_tangential_drive_string_mount_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXNygoLfehH00YfQeXWVPs5IGOzi2dDy3JawfgD-rQH2SoZ-H64zr7pVu1ZEcvuZvIyxCkFa2xCcPlb2LNPGW_pDlwxCvrl8W7UvINWstvv0SSi81C0E9fuZjkmHGaydCue0tNRh9Q1jQdh56z0nAs3yFMW0QAFp5VpUP86HIvJSgs-M1X4XUHF3_a2npW/w640-h480/bg3000_5903_kt_tangential_drive_string_mount_01.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br />On a positive note, I discovered this Beogram 5500 has a blown main fuse.<br />Replacing it got the turntable to turn on again and its motors run.</div>sonavoraudiohttp://www.blogger.com/profile/04144547857529140916noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-14397606157677516742024-02-18T10:08:00.002-05:002024-02-18T10:08:36.116-05:00Beogram 4002 (5513): A New Arrival from Texas<p style="text-align: justify;">I recently received a Beogram 4002 (Type 5513) from a customer in Texas. It arrived safely in a Beolover shipping container. This post gives a first assessment of the unit. A follow up will discuss the work done once this Beogram is back to like-new performance.</p><p style="text-align: justify;">I extracted the unit from the packaging and put it on the bench:</p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgr9JeuBhfXnv2GaPyT1BFz_9kDG8k3_4ydXvsgBBfCaUiSZOiUMBqZPy3HZzmBHLofW1fJBDH8EqXci99CErl9DACBIVi3lhEDBGyE4OreE7tCglgWT2J7AEgK2btRi_sK9GvHNjuXtEnPAvOw0mam-rGz6g5GmCSFSULevEmmoc_6A5Xpe1jSh8bOxo8/s1200/1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgr9JeuBhfXnv2GaPyT1BFz_9kDG8k3_4ydXvsgBBfCaUiSZOiUMBqZPy3HZzmBHLofW1fJBDH8EqXci99CErl9DACBIVi3lhEDBGyE4OreE7tCglgWT2J7AEgK2btRi_sK9GvHNjuXtEnPAvOw0mam-rGz6g5GmCSFSULevEmmoc_6A5Xpe1jSh8bOxo8/w640-h480/1.jpg" width="640" /></a></div><div style="text-align: justify;">The hood has the usual scratches:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiA0z2bCfM0BCC7S5u-FeOD0gZTNjE3ntmxzVxvx1tjHH_GuJx6L6dYE7UnIaqhLIAws3jWskc8otkL0onZMAnzWWwXQ1Fz4mpKgCk8sZFcEBjGAhTFggtaSL9dJKwGKGT4El1x7v-CBvhlfz2YIzZ7TpzTr-689eINB-vScZbjcEiKsaA5A-JIjCkh7zQ/s1200/2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiA0z2bCfM0BCC7S5u-FeOD0gZTNjE3ntmxzVxvx1tjHH_GuJx6L6dYE7UnIaqhLIAws3jWskc8otkL0onZMAnzWWwXQ1Fz4mpKgCk8sZFcEBjGAhTFggtaSL9dJKwGKGT4El1x7v-CBvhlfz2YIzZ7TpzTr-689eINB-vScZbjcEiKsaA5A-JIjCkh7zQ/w640-h480/2.jpg" width="640" /></a></div><div style="text-align: justify;">The hinges seem un-cracked, i.e. this hood could still be polished for some more useful life, or it could be replaced with a new reproduction hood from the Beoparts-store in Denmark.</div><div><div style="text-align: justify;">The keypad shows moderate deterioration from use:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijGrhClCW0hcFUC64DDCfZZwaSqILy1eVLgcfBAhkTP-a2mDbhngKs-l4Lt9qOGneIrIJHicoUfdGmoKLaEZcLXZm7OY5zJNv0PD5c-h7dmkRZ2gdByAF5uDv9ltl9V6QdN6MdwFIWK3yqnt-3PFabeGlZxvZ0sQB5ZegTgo4bD4NnIUfvXD0184HR710/s1200/3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijGrhClCW0hcFUC64DDCfZZwaSqILy1eVLgcfBAhkTP-a2mDbhngKs-l4Lt9qOGneIrIJHicoUfdGmoKLaEZcLXZm7OY5zJNv0PD5c-h7dmkRZ2gdByAF5uDv9ltl9V6QdN6MdwFIWK3yqnt-3PFabeGlZxvZ0sQB5ZegTgo4bD4NnIUfvXD0184HR710/w640-h480/3.jpg" width="640" /></a></div><div style="text-align: justify;">Further deterioration could be stopped by installing a <a href="https://beolover.com/products/commander-remote-control-for-beogram-4002-4" target="_blank">Beolover Commander remote control system</a>. It allows full control of the turntable via an Apple remote (or a Beo4 if the Beogram is to be used integrated with a more modern B&O system).</div></div><div><div style="text-align: justify;">The plinth is in decent condition. The right corner needs re-glueing and it has a small chip at the bottom</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYxQ9OepPNLZ9cqhIw31t6g-so6X-EkCurzvcxUVNC6NnIEkW1o-mQw5dmKmYyWepfV-YTluyvX6yxUraGpR9tdzB8QIFbgHeb9wzKcR0RRVzu2jDpNW64y22iMyGDrwECUrUWUB60ZcB5gr6SW3UUbb5exLDpCYN-JwT7g0mLlC-Usmjr35ESGznrNA8/s1200/4.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYxQ9OepPNLZ9cqhIw31t6g-so6X-EkCurzvcxUVNC6NnIEkW1o-mQw5dmKmYyWepfV-YTluyvX6yxUraGpR9tdzB8QIFbgHeb9wzKcR0RRVzu2jDpNW64y22iMyGDrwECUrUWUB60ZcB5gr6SW3UUbb5exLDpCYN-JwT7g0mLlC-Usmjr35ESGznrNA8/w640-h480/4.jpg" width="640" /></a></div><div style="text-align: justify;">but the left corner is still nice:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqapqNK8MfFMsgAbT8tr8tALW7hxrjHHvqYEjYusppfkOJnciuP3gDlkYkvu8d5BHLqCuVO9qChWBrcSKWK-ypBPjjSPLwpkvDYNX1a0pqGSb2497KodC7-rL1Bi_Y-9Vnzm-qSX5yHDMKWsrcNpGnwQ1Bq8YupNTKYSTBQ082U1K9YMhKX2b1Zg3oRVk/s1200/5.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiqapqNK8MfFMsgAbT8tr8tALW7hxrjHHvqYEjYusppfkOJnciuP3gDlkYkvu8d5BHLqCuVO9qChWBrcSKWK-ypBPjjSPLwpkvDYNX1a0pqGSb2497KodC7-rL1Bi_Y-9Vnzm-qSX5yHDMKWsrcNpGnwQ1Bq8YupNTKYSTBQ082U1K9YMhKX2b1Zg3oRVk/w640-h480/5.jpg" width="640" /></a></div><div style="text-align: justify;">There are a few small dings and scratches</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1ttmZ8_zlpMfVtriSF4qPQSflHcO55nuOVPK0I2mk1l32o0GRskQUHqZIuCSXzWbPalubRlQUahRJESf2sM9HeEHtu78RABmdsjWwRNpNY02AqrzLBJiqlgf7G9nyU7Mc6aL4xnHnBlDrsNo-P-fFtuRW3GccNX2dIjJTq7gbGrLGyOvmOALUDZEL6qQ/s1200/6.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1ttmZ8_zlpMfVtriSF4qPQSflHcO55nuOVPK0I2mk1l32o0GRskQUHqZIuCSXzWbPalubRlQUahRJESf2sM9HeEHtu78RABmdsjWwRNpNY02AqrzLBJiqlgf7G9nyU7Mc6aL4xnHnBlDrsNo-P-fFtuRW3GccNX2dIjJTq7gbGrLGyOvmOALUDZEL6qQ/w640-h480/6.jpg" width="640" /></a></div><div style="text-align: justify;">Nothing unusual for a 'middle aged guy'!...;-).</div></div><div style="text-align: justify;"><br /></div><div><div style="text-align: justify;">I removed the aluminum panels and the platter and had a look 'below deck':</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipSg9EllcVDKUdrF2sbblyuAEOhudGTV7wlDOxYQFhvUC1cL-uQ8SH6JasdZ_jguaUSodY2qQdByTIiwknwjhJY6u5XombOrY7tK-ZiYytcKNJAYVENDl095GKspMTYPYVlV4qOsngCPvuRL98Uff8IyQDNazDxW_-cDrZmXsFnmbjQconPIoFzDaKu9Q/s1200/7.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipSg9EllcVDKUdrF2sbblyuAEOhudGTV7wlDOxYQFhvUC1cL-uQ8SH6JasdZ_jguaUSodY2qQdByTIiwknwjhJY6u5XombOrY7tK-ZiYytcKNJAYVENDl095GKspMTYPYVlV4qOsngCPvuRL98Uff8IyQDNazDxW_-cDrZmXsFnmbjQconPIoFzDaKu9Q/w640-h480/7.jpg" width="640" /></a></div><div style="text-align: justify;">It seems pretty original without having seen any obvious results of 'human creativity'. Original condition is usually the best starting point for any restoration. Previous repair attempts often lead to interesting evenings, trying to figure out unusual issues...;-).</div></div><div style="text-align: justify;"><br /></div><div><div style="text-align: justify;">This 4002 has the usual degraded transport lock bushings as is evident from the many orange plastic fragments strewn around the enclosure:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1ZX03y8jtZqL-EqCiK14tedPPB7go1R4a6J_aRbwyiauOq8Ua5nrnRO7dYA2RxZXV8QhF-nhcP_hIN45C1Bs87Yelmg9V7G8LwTzW7vmxXqTBnusLDNhDf8Imnikt-ZQiFK2gEqgoxGTKYY_OHUtwrCsRowfHCdoU3wyzlErV1OntA5tdDvGjCJNUZVM/s1200/8.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1ZX03y8jtZqL-EqCiK14tedPPB7go1R4a6J_aRbwyiauOq8Ua5nrnRO7dYA2RxZXV8QhF-nhcP_hIN45C1Bs87Yelmg9V7G8LwTzW7vmxXqTBnusLDNhDf8Imnikt-ZQiFK2gEqgoxGTKYY_OHUtwrCsRowfHCdoU3wyzlErV1OntA5tdDvGjCJNUZVM/w640-h480/8.jpg" width="640" /></a></div><div style="text-align: justify;">Luckily, this will be easily fixed by installing new <a href="https://beolover.com/products/transport-lock-bushings-for-beogram-4000-4002-and-4004" target="_blank">Beolover transport lock bushings</a>.</div></div><div style="text-align: justify;"><br /></div><div><div style="text-align: justify;">After this visual inspection I plugged the unit in. The platter motor immediately came on, indicative of a not working off-switch. I had a look at the small circuit board beneath the carriage and it was immediately clear that the off-switch indeed had a problem:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWal9XeJKNb1Jt0r6wvK0RoO5uI4KUMVe10VwS16pTy9j_OrfQtbFKmvKJVEZDux1G7d9pMqSQqdvz9bgIAyUA7EGuYiI_W_6yM-_TQ7G7tEW8x1Lk4RFRvx0Fpr9IP5IigMHUFIJjwG1htg1o9j2GcHc4DJOQlkJ9yHzvpf19VxC2hEBMq69hRS9MWr4/s1200/9.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWal9XeJKNb1Jt0r6wvK0RoO5uI4KUMVe10VwS16pTy9j_OrfQtbFKmvKJVEZDux1G7d9pMqSQqdvz9bgIAyUA7EGuYiI_W_6yM-_TQ7G7tEW8x1Lk4RFRvx0Fpr9IP5IigMHUFIJjwG1htg1o9j2GcHc4DJOQlkJ9yHzvpf19VxC2hEBMq69hRS9MWr4/w640-h480/9.jpg" width="640" /></a></div><div style="text-align: justify;">It was lacking its plastic extension that is needed for being actuated by the carriage assembly when approaching the home position. I tried to find this plastic part within the enclosure, but no luck so far. Often they are stuck somewhere under the floating chassis or the boards. I will see when I take the unit apart during the restoration work. If I cannot find it, I will fix this with a 3D printed <a href="https://beolover.com/products/microswitch-plastic-extension-for-beogram-4002-and-4004" target="_blank">Beolover replacement part</a>.</div></div><div style="text-align: justify;"><br /></div><div><div style="text-align: justify;">In summary, this Beogram 4002 is a pretty good starting point for a complete functional restoration. Stay tuned!</div><p style="text-align: justify;"><br /></p></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-80147404701193114402024-02-15T23:01:00.000-05:002024-02-15T23:01:14.569-05:00Beogram 4000: Full Functional Restoration and a Test Spin with the Bill Evans Trio<p style="text-align: left;">This post describes the restoration work done on a Beogram 4000 that I recently received from a customer in Massachusetts. The initial assessment of this unit is posted <a href="https://beolover.blogspot.com/2024/01/beogram-4000-first-assessment.html" target="_blank">here</a>.</p><p style="text-align: left;">This shows the unit with the aluminum panels and platter removed:</p><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiw4cxNMAophSAmhZ2-t-RpCqRdgLj_fvbS3hVhDimCSd00w3Mufi9auzAMO83f3_F3vVv8E1bRayZAKV0U9ICnMm3VEkkRdWoHOUMLRmGI_F-h15fv9zDYFnBMFv6zi889qGxNNYvhsc9WIKulYVvvq9phPVyd6QojCHTFPHdkqOhzKtFTESdNCL34aDQ/s1200/1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiw4cxNMAophSAmhZ2-t-RpCqRdgLj_fvbS3hVhDimCSd00w3Mufi9auzAMO83f3_F3vVv8E1bRayZAKV0U9ICnMm3VEkkRdWoHOUMLRmGI_F-h15fv9zDYFnBMFv6zi889qGxNNYvhsc9WIKulYVvvq9phPVyd6QojCHTFPHdkqOhzKtFTESdNCL34aDQ/w640-h480/1.jpg" width="640" /></a></div><div style="text-align: left;">As usual, I started my process with rebuilding the systems on the carriage. This shows the arm lowering mechanism and the solenoid-activated switches:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZUg387y3pWkExumpfkrD8wrLgOzp0VwEgjKhVQdY1cgeUW2UOWJY8XybfaZv9blcZwh5u8vJm2BGCF8GvnLkKAaC6Sh-hycysCfxigw8Zm1AIUS_XvZiEgfcQNIoIFPmcv-vp8JtVfWECnRdwnolWJdLsEshDBEeGP7p9-dLBmBZZfPQ0a_PZSirltzg/s1200/2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZUg387y3pWkExumpfkrD8wrLgOzp0VwEgjKhVQdY1cgeUW2UOWJY8XybfaZv9blcZwh5u8vJm2BGCF8GvnLkKAaC6Sh-hycysCfxigw8Zm1AIUS_XvZiEgfcQNIoIFPmcv-vp8JtVfWECnRdwnolWJdLsEshDBEeGP7p9-dLBmBZZfPQ0a_PZSirltzg/w640-h480/2.jpg" width="640" /></a></div><div style="text-align: left;">I removed the rods on which the carriage travels, the spindle and the linkages of the arm lowering mechanism, as well as the damper. These parts often have hardened lubricants, which need to be removed and replaced with modern synthetic lubricants:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAA8zFnJouPvM1NB2Tt_EaNsKqm8kwPcoYeFO6l-M3Mlzhcg4YxeNaVUKagIx_C-6lYFjosdYdmYgwY7dQQAkZ72FKpgFZD0sKgA8T8TU82QlHnhxhtTiFW0wXqSA6eIfjOzrlQTgXHfaPRtvuri22C2iU4nGvvha3uOoe0wMVe6IBBqumFyuwgiVIegg/s1200/3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAA8zFnJouPvM1NB2Tt_EaNsKqm8kwPcoYeFO6l-M3Mlzhcg4YxeNaVUKagIx_C-6lYFjosdYdmYgwY7dQQAkZ72FKpgFZD0sKgA8T8TU82QlHnhxhtTiFW0wXqSA6eIfjOzrlQTgXHfaPRtvuri22C2iU4nGvvha3uOoe0wMVe6IBBqumFyuwgiVIegg/w640-h480/3.jpg" width="640" /></a></div><div style="text-align: left;">This shows the removed parts ready for the ultrasonic cleaner:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1FVWzZbTZUZ0PJVEYGV3V0d1ALhC1vo7bLRXLc_WUuhKgD6IdxkZUNr1PEuCOtVbMiO4xSmDYg_cZB7u8rZOjYL9SbHTc2m1OTNUUsTr4Sx9wQFZiqj6paTq_vbpTdU77UCxh-u0JAXcx50qE1tJV0lcSdsP445VtYCW2DSM6fo_jFeUsLVOgwbasMdQ/s1200/4.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="899" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1FVWzZbTZUZ0PJVEYGV3V0d1ALhC1vo7bLRXLc_WUuhKgD6IdxkZUNr1PEuCOtVbMiO4xSmDYg_cZB7u8rZOjYL9SbHTc2m1OTNUUsTr4Sx9wQFZiqj6paTq_vbpTdU77UCxh-u0JAXcx50qE1tJV0lcSdsP445VtYCW2DSM6fo_jFeUsLVOgwbasMdQ/w640-h480/4.jpg" width="640" /></a></div><div style="text-align: left;">A special feature of the setup in the Beogram 4000 are the solenoid activated switches. Their contact terminals are usually oxidized and this can create operational issues. This shows the original state of the switches indicating previous issues that someone tried to correct by bending the terminal tabs:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh10am1VX3ljkahkyMGmnYkUvoUqJAVZwbS-Djq7haAp9HE3S6lyYySl0mKJpv6617evg_ZM1qlwGaRUBNGsB6v91pssQxhp1YHgcl8zoACctcno11WCua6WB9XFHxS_gx9nf0ruONgBNWDdyD31VRNE8-OSzZnG-Bw6zcf_x3TOex5l_5OExE1pqXu810/s1200/5.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="899" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh10am1VX3ljkahkyMGmnYkUvoUqJAVZwbS-Djq7haAp9HE3S6lyYySl0mKJpv6617evg_ZM1qlwGaRUBNGsB6v91pssQxhp1YHgcl8zoACctcno11WCua6WB9XFHxS_gx9nf0ruONgBNWDdyD31VRNE8-OSzZnG-Bw6zcf_x3TOex5l_5OExE1pqXu810/w640-h480/5.jpg" width="640" /></a></div><div style="text-align: left;">The removal of the contact terminals requires extraction of the small vertical boards from the base PCBs. This shows the carriage upside down, which reveals the solder points of the vertical boards:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwB42PyUxm93FjuQjRETaVL9VVLi5hpUyR50dtN_9Cg9pxjaSC4AFF6n-ZAI_-G13M1U3_tW5Pk6TJU0ENoWCrAXhke5szB7b0dnStG5VPntUZ8DSdx6rOK3BvxCwDF1TfxD63tQ_ubHoAtHYl5sj0QF932KMCmulGA9YmCebPhs4AqTm1IwpGfFJ9h7U/s1200/6.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwB42PyUxm93FjuQjRETaVL9VVLi5hpUyR50dtN_9Cg9pxjaSC4AFF6n-ZAI_-G13M1U3_tW5Pk6TJU0ENoWCrAXhke5szB7b0dnStG5VPntUZ8DSdx6rOK3BvxCwDF1TfxD63tQ_ubHoAtHYl5sj0QF932KMCmulGA9YmCebPhs4AqTm1IwpGfFJ9h7U/w640-h480/6.jpg" width="640" /></a></div><div style="text-align: left;">Here in magnification:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZbawSk7TGOPcJYYrjsepnmnyMppOnE_zlC6_AeFs2Dpn1zmyKvAEet_QsuxrfRsktXZFXIHhXLcHYYAlL7MeK2JvtnrZNQrxbdeqf2ndLj2PBGyXlQzXgXZpUA5RhCodMFIgxXdcSYszXWEmtEYSh5IuUkVl5zk1eBKXl0GEnQFMWUaBBJtZjH_3YRfY/s1200/7.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZbawSk7TGOPcJYYrjsepnmnyMppOnE_zlC6_AeFs2Dpn1zmyKvAEet_QsuxrfRsktXZFXIHhXLcHYYAlL7MeK2JvtnrZNQrxbdeqf2ndLj2PBGyXlQzXgXZpUA5RhCodMFIgxXdcSYszXWEmtEYSh5IuUkVl5zk1eBKXl0GEnQFMWUaBBJtZjH_3YRfY/w640-h480/7.jpg" width="640" /></a></div><div style="text-align: left;">Sadly, the board that holds the switch that limits the solenoid current after the arm is down was cracked:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgU9eFfbI_jcFfLNt-CV21qW6tVJ6ALFKiy7PXWkRBCKGInx-xRB2hkLr7rE27jJpyt1kJ1Gc7Z835L86HKlY8tDOlLk6XtuxLnKC9y59Bx-R-wvYTLcRlytZ2OqBhzXvb4qikchBDmdG0W94CMTP61Um8WeEtlMqr8w_n3XFCpfNoLrRvkNDoj0L-HsCQ/s1200/8.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgU9eFfbI_jcFfLNt-CV21qW6tVJ6ALFKiy7PXWkRBCKGInx-xRB2hkLr7rE27jJpyt1kJ1Gc7Z835L86HKlY8tDOlLk6XtuxLnKC9y59Bx-R-wvYTLcRlytZ2OqBhzXvb4qikchBDmdG0W94CMTP61Um8WeEtlMqr8w_n3XFCpfNoLrRvkNDoj0L-HsCQ/w640-h480/8.jpg" width="640" /></a></div><div style="text-align: left;">This shows the vertical boards after removal, as well as the cracked piece:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZ-knxI7duu9MWTEvsY47BkXrkBHEMVDFnqrLo68DpeCc0x7KRYJ6-Ln53TvQhig4ioce6CRefxbvM8uI3W7oCsjNNJNOV6xs0kJIOzMHd-lDObRHB6V0Od1eJvidm3TO3t_7CK9uRbSYY4C6kpAaEn-Y73agpX9uHmAdmTVknOcfb2cxSseFdtEbBHR4/s1200/9.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgZ-knxI7duu9MWTEvsY47BkXrkBHEMVDFnqrLo68DpeCc0x7KRYJ6-Ln53TvQhig4ioce6CRefxbvM8uI3W7oCsjNNJNOV6xs0kJIOzMHd-lDObRHB6V0Od1eJvidm3TO3t_7CK9uRbSYY4C6kpAaEn-Y73agpX9uHmAdmTVknOcfb2cxSseFdtEbBHR4/w640-h480/9.jpg" width="640" /></a></div><div style="text-align: left;">With the carriage up, it is the perfect moment for also extracting the terminals of the carriage position switches. This shows the carriage position PCB still in place:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfdCmeD9utoQm5LAhCV2NNiC3e8eTypjawND3EYa3RNhkwad_u-MwPOAzJ4JUgGDLJ-Mb95NhIyCXlIGURC27sjxo9vX7CTXFVwue6iWWmQS5vBqd0KDYO3vdG_MJS2vOuAq842AnOS7Ym911zAIXNyLqCplvVUYthD2VyKj_YWiWxPhooh9z64IcbwA8/s1200/10.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfdCmeD9utoQm5LAhCV2NNiC3e8eTypjawND3EYa3RNhkwad_u-MwPOAzJ4JUgGDLJ-Mb95NhIyCXlIGURC27sjxo9vX7CTXFVwue6iWWmQS5vBqd0KDYO3vdG_MJS2vOuAq842AnOS7Ym911zAIXNyLqCplvVUYthD2VyKj_YWiWxPhooh9z64IcbwA8/w640-h480/10.jpg" width="640" /></a></div><div style="text-align: left;">Removal of its two screws and disconnecting the carriage motor leads allows a peek at the switch terminals:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEip5tQtZVeEVnBps5nPfgLfqpTntkrQ-ACiqcYeXTXGWAsck9lr1ObJhP_8Utr0NFoT0jq0WDDmeIv3ns4LSSY-E5lUHtKiPsRXbuKo3MlMSMocGmFCXD4on2lOsGy4DFJoKUX42o20wsZBNLE78TyJgZENVF2TmC0qhce1GCrK8VyGKuRZIU5_yauqvsQ/s1200/11.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEip5tQtZVeEVnBps5nPfgLfqpTntkrQ-ACiqcYeXTXGWAsck9lr1ObJhP_8Utr0NFoT0jq0WDDmeIv3ns4LSSY-E5lUHtKiPsRXbuKo3MlMSMocGmFCXD4on2lOsGy4DFJoKUX42o20wsZBNLE78TyJgZENVF2TmC0qhce1GCrK8VyGKuRZIU5_yauqvsQ/w640-h480/11.jpg" width="640" /></a></div><div style="text-align: left;">I removed all the terminals of the solenoid and carriage switches to get them ready for nickel/gold plating:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4oTul30cy7qasuq6NPaZzrinER_9SrhZsjZWBYw9uWlh_WqS2kyJI-t5a0Kys-pso_GxUVkKDwN6JWdThrhSIQaOJts3Lssaxf1gsKXKxkUNHGN5h0O8CTVXPRVMvgfscitHQRdwuCBQIYZ-GBZBRQNYoZEhwlQe81IVEFPZx7BRjcSQKZilAtpNwPw0/s1200/12.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4oTul30cy7qasuq6NPaZzrinER_9SrhZsjZWBYw9uWlh_WqS2kyJI-t5a0Kys-pso_GxUVkKDwN6JWdThrhSIQaOJts3Lssaxf1gsKXKxkUNHGN5h0O8CTVXPRVMvgfscitHQRdwuCBQIYZ-GBZBRQNYoZEhwlQe81IVEFPZx7BRjcSQKZilAtpNwPw0/w640-h480/12.jpg" width="640" /></a></div><div style="text-align: left;">I also removed the plastic actuators of the carriage switches for cleaning:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIhpJPiqHfSB-bN4J4cXAbFJnLZQzrOvjG5bRBWJtIfXnbE1wxqh1p-xSREC5BvKR1MFOnaVAEyunuVhmyPGAResWVswErt4sGH_x2b5TbaHjPJyrlOTAv68Z53JlX0R09u3joAtCO7_p2kAJWI7XsNbVC88QrIPcNHU74BOrDMEMV6VZLQjQe34Sh4Lg/s1200/13.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgIhpJPiqHfSB-bN4J4cXAbFJnLZQzrOvjG5bRBWJtIfXnbE1wxqh1p-xSREC5BvKR1MFOnaVAEyunuVhmyPGAResWVswErt4sGH_x2b5TbaHjPJyrlOTAv68Z53JlX0R09u3joAtCO7_p2kAJWI7XsNbVC88QrIPcNHU74BOrDMEMV6VZLQjQe34Sh4Lg/w640-h480/13.jpg" width="640" /></a></div><div style="text-align: left;">They are usually full of old lubricants since many owners think the actuators are the issue when operational issues develop, and their easy accessibility encourages the application of generous amounts of lubrication. Luckily, there are ultrasonic cleaners!...;-). It is also a great idea to replace the solenoid current limiting resistor that also resides on this board. It is usually semi-fried due to the fact that it is a bit under-dimensioned for the application:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi54kzg3VJDWwEqxCZzNVsIweYC0qqmrkdxhhVNMMp9my173r7TXtGi4Ol6ft2nxp42fxPJCGtpo21oGDdi3J7Vt1O4l_HeUvexIT-Ac6mWIr-H0J6Zze4Ypv7ehltkC0yC6xN770pOgXAGgSTCy4M0JGEKdzSgOVyB87UcObgn2f1-RKPIEODn2UbRTDM/s1200/14.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi54kzg3VJDWwEqxCZzNVsIweYC0qqmrkdxhhVNMMp9my173r7TXtGi4Ol6ft2nxp42fxPJCGtpo21oGDdi3J7Vt1O4l_HeUvexIT-Ac6mWIr-H0J6Zze4Ypv7ehltkC0yC6xN770pOgXAGgSTCy4M0JGEKdzSgOVyB87UcObgn2f1-RKPIEODn2UbRTDM/w640-h480/14.jpg" width="640" /></a></div><div style="text-align: left;">After a thorough cleaning I coated the contact terminals first with nickel to ensure good adhesion, followed by a layer of gold-cobalt alloy (which is the industry standard for contact plating). The cobalt alloy is much harder than pure gold, while still having an excellent corrosion resistance. This shows the freshly plated terminals:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9rqIKYe7CjRuhnQM0hx4dLSfCqISKpk833BTIFFNiGf2m6i7wVk29FIEqUdbiUy-S1LvGWVN1yH9mJJJ57ZmwI74IiIZRo41J9MT1iGgxIomR4jpJzH-MxqQ-5FgZXY91HJdNeJRUHV_CtZdnDuVq-3PFQQOpG8p4f-6lwO0qKyxXhrS-IkQ_VCX9kHM/s1200/15.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9rqIKYe7CjRuhnQM0hx4dLSfCqISKpk833BTIFFNiGf2m6i7wVk29FIEqUdbiUy-S1LvGWVN1yH9mJJJ57ZmwI74IiIZRo41J9MT1iGgxIomR4jpJzH-MxqQ-5FgZXY91HJdNeJRUHV_CtZdnDuVq-3PFQQOpG8p4f-6lwO0qKyxXhrS-IkQ_VCX9kHM/w640-h480/15.jpg" width="640" /></a></div><div style="text-align: left;">Beogolden! I re-installed the terminals in their respective boards:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjh5kINxewyhC_luvXaJkKcx0SrFxAbTaRopXfVjLfTUaxOAuCSYKxpeB0NoTbqCUfL2O-7FJc2cQ6b4M7wE-6t1rKmjt2uVnzrVP_Y84BbOfcRYe48kT4SHbGNhmeGuOcrA7FlH_VG1zTCfDALwC8eOAWMhp9dnqs4g0Z2indw839KZPOl9uTO5HNvGdA/s1200/16.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjh5kINxewyhC_luvXaJkKcx0SrFxAbTaRopXfVjLfTUaxOAuCSYKxpeB0NoTbqCUfL2O-7FJc2cQ6b4M7wE-6t1rKmjt2uVnzrVP_Y84BbOfcRYe48kT4SHbGNhmeGuOcrA7FlH_VG1zTCfDALwC8eOAWMhp9dnqs4g0Z2indw839KZPOl9uTO5HNvGdA/w640-h480/16.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: left;">and also put in a new 3W solenoid resistor:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzog4aAl6ljyjcO-QZwENrrcZJZ_u6sUdqSSygBG1Nnjfq-Rk1ozvQPiCGecfQ3Pdo12bMnTlVmxMBrjmg2y3RWNGUwRqwgKkt7AmvRB5PeswD_A5ggZLBbsPw1vMnIEMjyUns2BfVZOO9IQA8bKlryKsdJDpcVmdaribE9gopaVbNUvcFyF4C-4ODBLM/s1200/17.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzog4aAl6ljyjcO-QZwENrrcZJZ_u6sUdqSSygBG1Nnjfq-Rk1ozvQPiCGecfQ3Pdo12bMnTlVmxMBrjmg2y3RWNGUwRqwgKkt7AmvRB5PeswD_A5ggZLBbsPw1vMnIEMjyUns2BfVZOO9IQA8bKlryKsdJDpcVmdaribE9gopaVbNUvcFyF4C-4ODBLM/w640-h480/17.jpg" width="640" /></a></div><div style="text-align: left;">With the carriage board removed it is usually the perfect moment to replace the solenoid transistor, which is originally a TIP41 power transistor. In this Beogram 4000 I found that it was already replaced with a modern BD809, which is an excellent replacement choice. Higher power and higher voltage capability. I left it in place:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEip9QE1qy0CrY-EacoThOZF3AHAcPF7In1Oav_DGxIWiT1NDuIY5nbkkVCORONkhFWg6eE5TElUMWr29RZ5-aLJ8lL6LvnSBnj34qLilc5vDvpdpiKiEz57sAzuagNiM6-Rj8pNaX6IDJSkYGAmpui2JI6ShSTThyphenhyphenlLmiWZnQ4emF7yhZ5RvXqpHU1UBA4/s1200/18.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEip9QE1qy0CrY-EacoThOZF3AHAcPF7In1Oav_DGxIWiT1NDuIY5nbkkVCORONkhFWg6eE5TElUMWr29RZ5-aLJ8lL6LvnSBnj34qLilc5vDvpdpiKiEz57sAzuagNiM6-Rj8pNaX6IDJSkYGAmpui2JI6ShSTThyphenhyphenlLmiWZnQ4emF7yhZ5RvXqpHU1UBA4/w640-h480/18.jpg" width="640" /></a></div><div style="text-align: left;">Before I put the solenoid switches back together I glued the current limiter base PCB back together with a generous application of epoxy:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhKdZYguvQCSG8v1lUnF2Frdv0vNn9rLXMA4iJhaePnBnOKfKonrSI5nhLhlWKvtYBMTFP_LpsIimnhsW9bxtMp7HRjMjx9naUhumTkOc6oi9_as4dY_X3tK-nBO8uY2Sx-xnrfwjotDJ7BnS0EYSnRQf2iNtSc434Hp5EUuEfLq1iT8eP_myAeXI80jT8/s1200/20.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhKdZYguvQCSG8v1lUnF2Frdv0vNn9rLXMA4iJhaePnBnOKfKonrSI5nhLhlWKvtYBMTFP_LpsIimnhsW9bxtMp7HRjMjx9naUhumTkOc6oi9_as4dY_X3tK-nBO8uY2Sx-xnrfwjotDJ7BnS0EYSnRQf2iNtSc434Hp5EUuEfLq1iT8eP_myAeXI80jT8/w640-h480/20.jpg" width="640" /></a></div><div style="text-align: left;">This shows the switches back in their place:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfBO98wOfz-atDuLTCLqnvh-f6o2dnCiRuPu2Tar6SeX8spJ2i__S409HgH7vTLkiXIScUm20sDmbDCUeMi6bmG2PD4m9EBUpZL_U8OPoHQ1XCvyAiBhZvW7IKx1MXcYlKD35fwB0jwgyw9yRH2JsyfhiJ0uDSmYYzJ6MoOP1OEPpDkl5khm6tlB6Jf48/s1200/21.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfBO98wOfz-atDuLTCLqnvh-f6o2dnCiRuPu2Tar6SeX8spJ2i__S409HgH7vTLkiXIScUm20sDmbDCUeMi6bmG2PD4m9EBUpZL_U8OPoHQ1XCvyAiBhZvW7IKx1MXcYlKD35fwB0jwgyw9yRH2JsyfhiJ0uDSmYYzJ6MoOP1OEPpDkl5khm6tlB6Jf48/w640-h480/21.jpg" width="640" /></a></div><div style="text-align: left;">With the carriage up it is also a great moment to replace the cracking-prone MMC cartridge mount. For this the tonearm needs to be removed and the MMC mount assembly extracted. This is done best by 'simmering' the arm in hot water for 30-60 min. Then the assembly can usually be pushed out with a suitable rod that fits into the aluminum tube:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjdLfuv890h_jaFptpyp4T5yVt5N6YpxEpqkmF-MUuVTeQMjKI1_v_my7kv4gtFRmaCeha-ecgssID9Akaaa31E8N18I6gmCh32_dDxs-AoxFe5aJBAZLdSIIkaBLvzga6ZDM_xiy_LIbSAj7nIM26dAis2fVluYgKJSmoJUKfurZG8eLMFT3IETzELIHU/s1200/22.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjdLfuv890h_jaFptpyp4T5yVt5N6YpxEpqkmF-MUuVTeQMjKI1_v_my7kv4gtFRmaCeha-ecgssID9Akaaa31E8N18I6gmCh32_dDxs-AoxFe5aJBAZLdSIIkaBLvzga6ZDM_xiy_LIbSAj7nIM26dAis2fVluYgKJSmoJUKfurZG8eLMFT3IETzELIHU/w640-h480/22.jpg" width="640" /></a></div><div style="text-align: left;">This shows the Beolover MMC mount replacement soldered to the original wiring:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiw9VwcXNmb-vThxrXcmkWkXOKwmELCCTbQkH1ohs3b1O8bL8JVyjNak0D-HRb2ESAZ3BG27nVRWZj3N8wKjLIckoD9UJG1Kg0LRCOTlGrmOX019sOUmWlCLwDUitQP_D1d8vy3OfqfXQNAadFwgamkApBY5giIiXEMfyGbikg9-cJMWHt5znYEV2wtdLI/s1200/23.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="803" data-original-width="1200" height="428" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiw9VwcXNmb-vThxrXcmkWkXOKwmELCCTbQkH1ohs3b1O8bL8JVyjNak0D-HRb2ESAZ3BG27nVRWZj3N8wKjLIckoD9UJG1Kg0LRCOTlGrmOX019sOUmWlCLwDUitQP_D1d8vy3OfqfXQNAadFwgamkApBY5giIiXEMfyGbikg9-cJMWHt5znYEV2wtdLI/w640-h428/23.jpg" width="640" /></a></div><div style="text-align: left;">The Beolover MMC mount is a 3D printed nylon part laminated with a flex-PCB that has gold plated traces that match the cartridge terminals. I installed the part making sure that cartridges will snugly fit without a significant gap to the aluminum tube. This was achieved by using a special tool that I developed for holding everything in the proper place while the glue hardened:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvuOXm53zG7Wu-bbWDTaSSAVpT7Mpacp8NknmjfOPCVglzlw29GZl2R_5TaEQvr0-lkaRPbTwfgtnH1dleiCPgLnmlyRCm9aUpCUe3wlDlcOnnHeeZxOfY0kQtl_DwQWAMfpaleAPPtODulSg3gawX7Esgp_myME4B-9e5_dmFUUNqCKwOemoVDvIxj5c/s1200/24.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="572" data-original-width="1200" height="306" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvuOXm53zG7Wu-bbWDTaSSAVpT7Mpacp8NknmjfOPCVglzlw29GZl2R_5TaEQvr0-lkaRPbTwfgtnH1dleiCPgLnmlyRCm9aUpCUe3wlDlcOnnHeeZxOfY0kQtl_DwQWAMfpaleAPPtODulSg3gawX7Esgp_myME4B-9e5_dmFUUNqCKwOemoVDvIxj5c/w640-h306/24.jpg" width="640" /></a></div><div style="text-align: left;">After this process it was time to re-install the arm. This was a later model 4000, so the MMC mount connected via soldered wires. It is a good idea to fixate the arm for the soldering work:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhABpeXfbiKtQ536sy48OAtqQFf8H-nVV2WmtFtwKpgq9Pd689k6ANdsnDbY-QWE1AhMGxxVpZZPKHJB40oeio2ZYgAhIFTlsl43ciS-ccWugJJYVe5pHcHU_QbJaF3h3otlAelnCXl33U1H03pN9gn0InuTOV9GDYwukyKkGYws5rmgY1uU1AtSqWejBI/s1200/25.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhABpeXfbiKtQ536sy48OAtqQFf8H-nVV2WmtFtwKpgq9Pd689k6ANdsnDbY-QWE1AhMGxxVpZZPKHJB40oeio2ZYgAhIFTlsl43ciS-ccWugJJYVe5pHcHU_QbJaF3h3otlAelnCXl33U1H03pN9gn0InuTOV9GDYwukyKkGYws5rmgY1uU1AtSqWejBI/w640-h480/25.jpg" width="640" /></a></div><div style="text-align: left;">After the arm was back in place it was time to install the cleaned mechanical parts:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHom6M5zgWO2fOAzWA92G6Ag1TfxwRar8p0Z8KGVQBOcwrC1ssKMRLZx87c6ZAEpBN0lBEeWRFtEGIWL5U_dAlo_117NzOEQAAVPYGprBNDm_d_FH9DE7VyR2FpSc7ZOCE2WRYHob-8AtifAHIw8sB8HkTsIkGFGBREZZV4jrKIJPqC5J7TjAJyl9oe6A/s1200/26.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHom6M5zgWO2fOAzWA92G6Ag1TfxwRar8p0Z8KGVQBOcwrC1ssKMRLZx87c6ZAEpBN0lBEeWRFtEGIWL5U_dAlo_117NzOEQAAVPYGprBNDm_d_FH9DE7VyR2FpSc7ZOCE2WRYHob-8AtifAHIw8sB8HkTsIkGFGBREZZV4jrKIJPqC5J7TjAJyl9oe6A/w640-h480/26.jpg" width="640" /></a></div><div style="text-align: left;">As usual, I replaced the <a href="https://beolover.com/products/damper-gasket-for-beogram-4000-4002-and-4004" target="_blank">damper gasket</a>:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjSxHnMmzdzuTb4o8wRcAOu1uDfZI94vOf9BtYFbbLneYKNhK6IhtQ8VyeBA_mkuJDHcBWDLSEdhUXV-m8YQk8wQxfy4jZQQcUiwoceEUf2z2N1pXx7YO3Cg9KzNQou18AcGDAAYPcjsQoUcPkBV-KI64btghHy-vK2hW2lNmMR-dUfTHOgAj-misEoXHI/s1200/27.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjSxHnMmzdzuTb4o8wRcAOu1uDfZI94vOf9BtYFbbLneYKNhK6IhtQ8VyeBA_mkuJDHcBWDLSEdhUXV-m8YQk8wQxfy4jZQQcUiwoceEUf2z2N1pXx7YO3Cg9KzNQou18AcGDAAYPcjsQoUcPkBV-KI64btghHy-vK2hW2lNmMR-dUfTHOgAj-misEoXHI/w640-h480/27.jpg" width="640" /></a></div><div style="text-align: left;">The original gaskets are often hardened and that causes issues with the arm lowering speed. Sudden drops or not lowering arms can be the result of retaining the original gasket. A new gasket ensures a consistent arm lowering speed.</div><div><div style="text-align: left;">This late model Beogram 4000 was already outfitted with a solenoid arm with a plastic end piece. Unfortunately, these tend to crack around the rivet that holds them to the main metal part: </div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEippinf779J4xTYBzCFW8kHnoiej-WpvQvhajLtQVHf04Z0qfVc0m05Y_8hMw152iT7oAswKvA_FTrxZDc9QSeH3O4_s3STRHFLVRC_T277hUs8h3tr3vijRQ0YcSmFjCaHGDsXhtIF4HwwF5chNdnuTYgHgubRfbRSXl2tfE9tcpOtU3-vdkJ0ainVGIA/s1200/28.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="899" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEippinf779J4xTYBzCFW8kHnoiej-WpvQvhajLtQVHf04Z0qfVc0m05Y_8hMw152iT7oAswKvA_FTrxZDc9QSeH3O4_s3STRHFLVRC_T277hUs8h3tr3vijRQ0YcSmFjCaHGDsXhtIF4HwwF5chNdnuTYgHgubRfbRSXl2tfE9tcpOtU3-vdkJ0ainVGIA/w640-h480/28.jpg" width="640" /></a></div><div style="text-align: left;">I removed the cracked part and installed a <a href="https://beolover.com/products/solenoid-arm-for-beogram-4000" target="_blank">Beolover solenoid arm extension</a>:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZLAa0zaZQ3EwDR58bmVaUvnNjlStllts8-4pK3UJe4ff3Gd9OJZpXsItVwMvi6aBZvisTz4ffLYMM7CjRAu375nfb6Z5tAQa8bxELTRTyykiXDndiVUDuy9KzSMe3LmCsSo-TsiDnUqCYTCl-RnDaFEBM6gvBn-O71fccUrtH_Ym8yC-ns8yE4-DBOhc/s1200/29.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZLAa0zaZQ3EwDR58bmVaUvnNjlStllts8-4pK3UJe4ff3Gd9OJZpXsItVwMvi6aBZvisTz4ffLYMM7CjRAu375nfb6Z5tAQa8bxELTRTyykiXDndiVUDuy9KzSMe3LmCsSo-TsiDnUqCYTCl-RnDaFEBM6gvBn-O71fccUrtH_Ym8yC-ns8yE4-DBOhc/w640-h480/29.jpg" width="640" /></a></div><div style="text-align: left;">This shows everything put back together:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFQ_q0zTsA9boKNDuSeXcFTUrhyZ3VyJksgDL8MbfpXnwrTZT7L8RcdWi3_bLqvUPaIBcHm9syJaG9BKnl8PU6ceSlZJ-2U2MTZMwjD8cTmvcxZuHgnJwT50Tu8rJ5foY2ltEQNuAxEDx1Rs_Qjdms0jmhJ8e69BITNiDyzHzFAPctxOkHu_sbvmpMBJQ/s1200/30.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFQ_q0zTsA9boKNDuSeXcFTUrhyZ3VyJksgDL8MbfpXnwrTZT7L8RcdWi3_bLqvUPaIBcHm9syJaG9BKnl8PU6ceSlZJ-2U2MTZMwjD8cTmvcxZuHgnJwT50Tu8rJ5foY2ltEQNuAxEDx1Rs_Qjdms0jmhJ8e69BITNiDyzHzFAPctxOkHu_sbvmpMBJQ/w640-h480/30.jpg" width="640" /></a></div><div style="text-align: left;">The final linkage that needed re-lubrication is the one that connects the damper to the actual arm assembly. You can see it stick out in the V-groove in the lateral arm in this picture:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDTWnNQ_x60RGEg-IjZ6VZ7KiwZQ6LfRtfwlVKMoR7V9tP_T1Z6r1GIC4VZ2d9-CRcqbHvThOyPHI1X2U0ewSxjEWgyvzdkROtV2zliJnOCQCexbhS0PZxTXvfOCAGDS1ZHBlR2k7quxXAdYmVC8bMIDUPDiifdGdFLzPcAWlVS62eXUN51BLooi4seKk/s1200/31.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDTWnNQ_x60RGEg-IjZ6VZ7KiwZQ6LfRtfwlVKMoR7V9tP_T1Z6r1GIC4VZ2d9-CRcqbHvThOyPHI1X2U0ewSxjEWgyvzdkROtV2zliJnOCQCexbhS0PZxTXvfOCAGDS1ZHBlR2k7quxXAdYmVC8bMIDUPDiifdGdFLzPcAWlVS62eXUN51BLooi4seKk/w640-h480/31.jpg" width="640" /></a></div><div style="text-align: left;">To get to the pivot point of this linkage, the sensor arm assembly needs to be removed. This shows the linkage already removed from the assembly (make sure you do not loose the little spring that is under the retaining washer on the pivot point if you try to do this at home):</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQeLM8NVjszcL6VZDbm6oAFL7ZIMnvvt45TQfswdbPLdImTJ31Wk6ciFwFBr7XG1gHZ16hpONoUxeTNhuXTwrKvEsyjYZtXJp1XemkOsD4lux5e2v9NNeCCA9SWxAvQdctl4u2LLGTo3DrZ7bK44sw5gfvSoCaMKHWBCRXdNbnROf4hfmsIFYtSY-7XZU/s1200/32.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQeLM8NVjszcL6VZDbm6oAFL7ZIMnvvt45TQfswdbPLdImTJ31Wk6ciFwFBr7XG1gHZ16hpONoUxeTNhuXTwrKvEsyjYZtXJp1XemkOsD4lux5e2v9NNeCCA9SWxAvQdctl4u2LLGTo3DrZ7bK44sw5gfvSoCaMKHWBCRXdNbnROf4hfmsIFYtSY-7XZU/w640-h480/32.jpg" width="640" /></a></div><div style="text-align: left;">As usual, the small copper plate that aids the lateral arm movement in up position came loose after a light tug with my tweezers:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmG0pF71qw6Dic7-stQdwh5_A89zNb_fqeZGLhvvTrqVYp65TA3kN96drAGKl1of9wC3r0e3EyYC99h2yR4Hi464-_RCEHwXWhRs7mQ3Wbu897MTyjN38iPWqD5-qzSZ5JpXfw6sIgXFaz7U0tPki0liT8LCctVHE_W1es77p5xuNF9EplveGTKg_z5sQ/s1200/33.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmG0pF71qw6Dic7-stQdwh5_A89zNb_fqeZGLhvvTrqVYp65TA3kN96drAGKl1of9wC3r0e3EyYC99h2yR4Hi464-_RCEHwXWhRs7mQ3Wbu897MTyjN38iPWqD5-qzSZ5JpXfw6sIgXFaz7U0tPki0liT8LCctVHE_W1es77p5xuNF9EplveGTKg_z5sQ/w640-h480/33.jpg" width="640" /></a></div><div style="text-align: left;">I glued it back in place with epoxy and re-installed the sensor arm with the re-lubricated linkage.</div></div><div><div style="text-align: left;">The next step of the carriage restoration was the installation of a LED based tracking sensor light source. This shows the original setup with the black bulb housing in place:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiK53Tf_VuotTClwAkTqng9U9Qww8qz66iTZUKiQA-0ufJCCTFFlWnl4VdbEgp13UVaouNJJn1JCcEspiPFB73Re_7ZCQAGTYVFeyK6B0O1Pd4Pva_uV3j6YzbDxVgGokFdHDbM9tZxWkEjejwivhvYywMSRj8GfjrZviUoZyIySlHE4ccJCmBdiBRnECA/s1200/34.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiK53Tf_VuotTClwAkTqng9U9Qww8qz66iTZUKiQA-0ufJCCTFFlWnl4VdbEgp13UVaouNJJn1JCcEspiPFB73Re_7ZCQAGTYVFeyK6B0O1Pd4Pva_uV3j6YzbDxVgGokFdHDbM9tZxWkEjejwivhvYywMSRj8GfjrZviUoZyIySlHE4ccJCmBdiBRnECA/w640-h480/34.jpg" width="640" /></a></div><div style="text-align: left;">I removed the bulb housing, which revealed the aperture that governs the tracking feedback process:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXqvB_f4Kn7i7cUiCZGUya_BdkLuLIrBSXDgqudM7luoCb1JwThrzqJycZ8JKGmC3j77xO5O2EX5a6tR9lV1G2OaEI7gUV4QGuSv0iQti_DFHeLiLJmNTJAH9A4bbR8w6Waon1eN-X4jHDPgkLpDZPyqFE-76C4frEsEU4jKLc_vU9f6ScWm_AN8ATQ_s/s1200/35.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXqvB_f4Kn7i7cUiCZGUya_BdkLuLIrBSXDgqudM7luoCb1JwThrzqJycZ8JKGmC3j77xO5O2EX5a6tR9lV1G2OaEI7gUV4QGuSv0iQti_DFHeLiLJmNTJAH9A4bbR8w6Waon1eN-X4jHDPgkLpDZPyqFE-76C4frEsEU4jKLc_vU9f6ScWm_AN8ATQ_s/w640-h480/35.jpg" width="640" /></a></div><div style="text-align: left;">Then I installed a <a href="https://beolover.com/products/copy-of-tracking-sensor-led-light-source-for-beogram-4000" target="_blank">Beolover tracking sensor LED assembly for the Beogram 4000</a>. It is a drop in ready part that directly replaces the original bulb housing:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEji7niHEr_EtL90yWGQWoN3UJH_7HMBzHSkLP__sUKExax3PE5Ji27e5U524Xvv-MHl-Sd-3VP0Jzj7Zbp-cnLgKTNq4nszozexlSXdhz7JAzqPk3qYSkvWQOIid-J99aP-fxfsqle7hrCwR9fENbakuGp7hmHyuuBGxzB1o-pCf4iGuc4zABXeFkZ9mo4/s1200/36.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEji7niHEr_EtL90yWGQWoN3UJH_7HMBzHSkLP__sUKExax3PE5Ji27e5U524Xvv-MHl-Sd-3VP0Jzj7Zbp-cnLgKTNq4nszozexlSXdhz7JAzqPk3qYSkvWQOIid-J99aP-fxfsqle7hrCwR9fENbakuGp7hmHyuuBGxzB1o-pCf4iGuc4zABXeFkZ9mo4/w640-h480/36.jpg" width="640" /></a></div><div style="text-align: left;">The final step was the replacement of the cracked carriage pulley. They always crack at the square nut that counters the set screw:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3RduPpBlbH8Sv5ao26j2Kg7_ouNPZc1Al0FHnZmoDZbt5hdMz9RIZjdP0iiID8TrnYwrZKcc_qTm9FgEVg6uaCrYKZmJ9x7jzQGbUNwL2FzGBnA8sYWsyeagBro1IZs9-5p1MFtdMGnFy-l99P_OuAvkglnL1nJk2PzsSHsF6VUKvbPzu_OOVHbggv6Y/s1200/37.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3RduPpBlbH8Sv5ao26j2Kg7_ouNPZc1Al0FHnZmoDZbt5hdMz9RIZjdP0iiID8TrnYwrZKcc_qTm9FgEVg6uaCrYKZmJ9x7jzQGbUNwL2FzGBnA8sYWsyeagBro1IZs9-5p1MFtdMGnFy-l99P_OuAvkglnL1nJk2PzsSHsF6VUKvbPzu_OOVHbggv6Y/w640-h480/37.jpg" width="640" /></a></div><div style="text-align: left;">I replaced it with a precision machined aluminum pulley:</div><div style="text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjlclu5i9nq1PePBAy2_IyK_ljinHi7hIV1V2wb7VhlqAts_VZ6AnnvVMig1hQlfoiCb4kf8VefPxG9Oor9_0yOM_jOSzLJ_Tgp3etEBdXSC7DwoSx4mMpRAyWXOVLFKHA592OWjeDt91supywVKILTYvKaWezyNzim-_eNa7qQ9d-TWyFIcUahdPGcd_8/s1200/81.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjlclu5i9nq1PePBAy2_IyK_ljinHi7hIV1V2wb7VhlqAts_VZ6AnnvVMig1hQlfoiCb4kf8VefPxG9Oor9_0yOM_jOSzLJ_Tgp3etEBdXSC7DwoSx4mMpRAyWXOVLFKHA592OWjeDt91supywVKILTYvKaWezyNzim-_eNa7qQ9d-TWyFIcUahdPGcd_8/w640-h480/81.jpg" width="640" /></a></div><div style="text-align: left;">This concluded my work on the carriage and I began working on restoring the electronic circuitry and the platter motor. This shows the original main and motor capacitors, as well as the AC platter motor:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6czagkJ-TL8wS43zHJhd2aDTc59R4HB9qDEumLIo6yDnCUlTWjiPrwCytcHBFLR2suHgfxyUwvCV4LhjLs3Dp0SHGJ2L3OT5IuKlgopnklV2nWs4KbJCbkzH8yvn0lR9lf7pdGF3UInW5UNanrB65PaeZjduI6LNlfZfVBDGID2eL8MvCy6K7F9i7YVg/s1200/38.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6czagkJ-TL8wS43zHJhd2aDTc59R4HB9qDEumLIo6yDnCUlTWjiPrwCytcHBFLR2suHgfxyUwvCV4LhjLs3Dp0SHGJ2L3OT5IuKlgopnklV2nWs4KbJCbkzH8yvn0lR9lf7pdGF3UInW5UNanrB65PaeZjduI6LNlfZfVBDGID2eL8MvCy6K7F9i7YVg/w640-h480/38.jpg" width="640" /></a></div><div style="text-align: left;">I removed everything:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEidM8Mqij94Za7cR3ieLDzVGFtqGK9EqTGMCBgDbBt8MDkEKUGDL3GTipPxXxP31AzPAiMq__r5pdvHp6yJOh7WlZ7H63KOONnGTow83_aYHhdG2rMdjjhshRapLLN5OMvC9KM0B_abDsMy6h1XPGQMGrvzDE5EJbWv3hy9W5cx9zY3u19a0-JOsfret8o/s1200/39.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEidM8Mqij94Za7cR3ieLDzVGFtqGK9EqTGMCBgDbBt8MDkEKUGDL3GTipPxXxP31AzPAiMq__r5pdvHp6yJOh7WlZ7H63KOONnGTow83_aYHhdG2rMdjjhshRapLLN5OMvC9KM0B_abDsMy6h1XPGQMGrvzDE5EJbWv3hy9W5cx9zY3u19a0-JOsfret8o/w640-h480/39.jpg" width="640" /></a></div><div style="text-align: left;">This shows the original motor and reservoir capacitors</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0EzQANNHnMzmalC7RhnC1RiVnQGseggC4qMyyQYJTu6G9iLCAb7FKtQ6w_-Bnny8idvtLcNdDRPxLRDhV_uTwKYlVZsFo5ybVmLf5kPHYagO_vQZM3VkHPb11HHV1IFUPHwsI_XXXbY3-XKfDXTAPthkJ6u65i1GiauoNSCdSgUjmuA_ePKaAUiDlYwQ/s1200/40.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0EzQANNHnMzmalC7RhnC1RiVnQGseggC4qMyyQYJTu6G9iLCAb7FKtQ6w_-Bnny8idvtLcNdDRPxLRDhV_uTwKYlVZsFo5ybVmLf5kPHYagO_vQZM3VkHPb11HHV1IFUPHwsI_XXXbY3-XKfDXTAPthkJ6u65i1GiauoNSCdSgUjmuA_ePKaAUiDlYwQ/w640-h480/40.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: left;">and the extracted motor:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjTQ9-HSMwclJ2Zwuv_XzUPDDUZgdHApyLQINhhM6HUsQunlpZxxfXVs-WireNWayRnV2eNn4Lr_NAjF-VJoK5PClryR1jqRwaJ4FpHr9Y0vY30LPAjFtvqRFTesR2u3T-uJweC_HdGW1WczBHHWA96CxLH6sGEl4P7wR5R5NhokfqLPlK82l4t3xxGJ8A/s1200/41.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjTQ9-HSMwclJ2Zwuv_XzUPDDUZgdHApyLQINhhM6HUsQunlpZxxfXVs-WireNWayRnV2eNn4Lr_NAjF-VJoK5PClryR1jqRwaJ4FpHr9Y0vY30LPAjFtvqRFTesR2u3T-uJweC_HdGW1WczBHHWA96CxLH6sGEl4P7wR5R5NhokfqLPlK82l4t3xxGJ8A/w640-h480/41.jpg" width="640" /></a></div><div style="text-align: left;">Since oil infusion of the bearings can take up to three days, I disassembled the motor first:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhgc9owMx2Qgei9UByut039XqBvhe91uatvR14i2oPRnsA4AwNpQkZDHJe4chcTKXQbRXxXtwiP34XlraDPxOz2QiEh9Xlkvu6IPfzr5rlgFK8SRcz_unPpYXDmFjGkr9yRNF-haJA_FqD1wXqWwO4dVmr4sRQ3Uibzyv-_-6u5GINfztUPWzkTgDk2lQw/s1200/42.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="513" data-original-width="1200" height="274" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhgc9owMx2Qgei9UByut039XqBvhe91uatvR14i2oPRnsA4AwNpQkZDHJe4chcTKXQbRXxXtwiP34XlraDPxOz2QiEh9Xlkvu6IPfzr5rlgFK8SRcz_unPpYXDmFjGkr9yRNF-haJA_FqD1wXqWwO4dVmr4sRQ3Uibzyv-_-6u5GINfztUPWzkTgDk2lQw/w640-h274/42.jpg" width="640" /></a></div><div style="text-align: left;">I immersed the motor enclosure halves in motor oil to re-infuse the integrated bearings with motor oil. After I pulled a vacuum strong bubbling occurred indicative of the oil infusion process:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjvwe3I1qJ8uXIiRVlNF423gX6vjy0amt1_2Z4jJPKRZJXnauYVJ_VhwIsctc2Ni6BKMToC-D3YvYPtu03AuSmQOanQhpcu-qzb7suIpw9o3uj9lbItPF66MO7Vne7b55vENglOVMHg1aFPac-6Ny4xGFAHTHMzmNr3TD6A_ooKysvdp-g5fqj_dcUMAus/s1200/43.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjvwe3I1qJ8uXIiRVlNF423gX6vjy0amt1_2Z4jJPKRZJXnauYVJ_VhwIsctc2Ni6BKMToC-D3YvYPtu03AuSmQOanQhpcu-qzb7suIpw9o3uj9lbItPF66MO7Vne7b55vENglOVMHg1aFPac-6Ny4xGFAHTHMzmNr3TD6A_ooKysvdp-g5fqj_dcUMAus/w640-h480/43.jpg" width="640" /></a></div><div style="text-align: left;">While this process was under way, I focused on the remaining restoration tasks. This shows the main PCB in original condition:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi_NAHlHCHPrJVXBdBBLJ95CNcG0sVKp0IeDBYbzaCvhixnez0hxDn4MtKCwxpB_uEYJc4uFG9wgOWgeFh7F0SDEOR7F8EcSAWU6lpHILAENIeiVAsCUE42Nwz2pDYZY9A7PyLho_5JxrJt-w4eH7Etzs18_2I6sFrD6B9zoj8VbLuUCX-Hh9EL_O67zsw/s1200/44.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi_NAHlHCHPrJVXBdBBLJ95CNcG0sVKp0IeDBYbzaCvhixnez0hxDn4MtKCwxpB_uEYJc4uFG9wgOWgeFh7F0SDEOR7F8EcSAWU6lpHILAENIeiVAsCUE42Nwz2pDYZY9A7PyLho_5JxrJt-w4eH7Etzs18_2I6sFrD6B9zoj8VbLuUCX-Hh9EL_O67zsw/w640-h480/44.jpg" width="640" /></a></div><div style="text-align: left;">I replaced all electrolytic capacitors, power transistors, <a href="https://beolover.com/products/siemens-relay-replacement-for-beogram-4000-4002-and-4004" target="_blank">the RPM relay</a> and the RPM trimmers with modern parts. I also replaced the <a href="https://beolover.com/products/sensor-transistor-and-biasing-trimmer-beogram-4002-4-and-4000" target="_blank">record sensor transistor and its biasing resistor.</a> This is a frequent trouble point since the original transistors often loose part of their gain, which can disable the record detection circuit. This shows the rebuilt board together with the extracted original parts:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6ockOEbxAE4Zfpp1CcocvhcCQDZrA5xoNtEV1NMt7SMB4T4e_4g-RVeh5-mNHDRJula36fPz5rENDVddQe8HOIrcoqbCj7behrKcLLxkNIOPh2u74XB9nKOzFovUE6PNHaidjWSxcyd7cAQkyCahJRpUoI8VZohmzgCoy75b-UiMvW9P4BZWSE3wKZzk/s1200/45.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6ockOEbxAE4Zfpp1CcocvhcCQDZrA5xoNtEV1NMt7SMB4T4e_4g-RVeh5-mNHDRJula36fPz5rENDVddQe8HOIrcoqbCj7behrKcLLxkNIOPh2u74XB9nKOzFovUE6PNHaidjWSxcyd7cAQkyCahJRpUoI8VZohmzgCoy75b-UiMvW9P4BZWSE3wKZzk/w640-h480/45.jpg" width="640" /></a></div><div style="text-align: left;">I moved on to the power supply PCB next to the transformer. As found in many Beogram 4000 the 6V supply fuse had disintegrated.</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjsp0gjs9HUsT0TnJxERsPSxH4hW8SEExr7F2y8WmS0AO1gu95ekgInxtLoZ3vxrI4CsS2-uYN1qyRzlyXAWwOQSJWsnqljlsOUbLfVDgAzGstt_8E446s0WQX-Yg0YHimz_L_mt3O9Pg5f9kZr1kbbDVs_u3qkvHVmVII-53R9etePDN__tlldOjgZNKw/s1200/46.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjsp0gjs9HUsT0TnJxERsPSxH4hW8SEExr7F2y8WmS0AO1gu95ekgInxtLoZ3vxrI4CsS2-uYN1qyRzlyXAWwOQSJWsnqljlsOUbLfVDgAzGstt_8E446s0WQX-Yg0YHimz_L_mt3O9Pg5f9kZr1kbbDVs_u3qkvHVmVII-53R9etePDN__tlldOjgZNKw/w640-h480/46.jpg" width="640" /></a></div><div style="text-align: left;">I installed new fuses on the PCB</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWuD9pOmMCd86V0O8DJIZXVVue-LnTcUK15DXVSleqXyJqwN5e0gZXnedQWAeOn83EqHkQiTi9XBYl5OlVUIPR8nczrg0CZ0jwOvij4ExaxbRGd0rJtbwVn8E8tcbJQZq6QxksDLKOiNHJ3NZe2sA6d8t_hMaw9O14eFcmu5zx2jXaTbaNHXFTBmfwDuA/s1200/47.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWuD9pOmMCd86V0O8DJIZXVVue-LnTcUK15DXVSleqXyJqwN5e0gZXnedQWAeOn83EqHkQiTi9XBYl5OlVUIPR8nczrg0CZ0jwOvij4ExaxbRGd0rJtbwVn8E8tcbJQZq6QxksDLKOiNHJ3NZe2sA6d8t_hMaw9O14eFcmu5zx2jXaTbaNHXFTBmfwDuA/w640-h480/47.jpg" width="640" /></a></div><div style="text-align: left;">and also in the main fuse cabinet, where the fuses had the same issue </div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgmlGAcLYYXxAeHbsiqE7dPqP271JEq73bhEUxcdoBBtTAnX1QcAn3Jd2yqZlq8zoMoTXKRkjctMUkNXMB9DusS7XvVyZRc6dJ1k5x_qY0SvDVP0ZXkXWYQdcQ6ZgaVWY5558pOApeukt-LkLpyvXGsyEEsbUBKZctAIYjh_hjHswHUAfJV53EbRtlIMvA/s1200/48.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgmlGAcLYYXxAeHbsiqE7dPqP271JEq73bhEUxcdoBBtTAnX1QcAn3Jd2yqZlq8zoMoTXKRkjctMUkNXMB9DusS7XvVyZRc6dJ1k5x_qY0SvDVP0ZXkXWYQdcQ6ZgaVWY5558pOApeukt-LkLpyvXGsyEEsbUBKZctAIYjh_hjHswHUAfJV53EbRtlIMvA/w640-h480/48.jpg" width="640" /></a></div><div style="text-align: left;"><br /></div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1JJswWVFSoJaHGTTbZUNxZmDOXLcQq4eWkd2MK3bfgQnA71NsxzZEnmeP4tkeT9f9FepnEa22LCQCPjvmzWRok4wcEfMlTjVdwIUhwHHNBuKc-Xt9J67A5yOmwgc4XLMI_4d5F6pfScyNGLRZ5jVudL7a7oY2nHJEGJXrT56al12r-xpkLtjxku2cW6A/s1200/49.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg1JJswWVFSoJaHGTTbZUNxZmDOXLcQq4eWkd2MK3bfgQnA71NsxzZEnmeP4tkeT9f9FepnEa22LCQCPjvmzWRok4wcEfMlTjVdwIUhwHHNBuKc-Xt9J67A5yOmwgc4XLMI_4d5F6pfScyNGLRZ5jVudL7a7oY2nHJEGJXrT56al12r-xpkLtjxku2cW6A/w640-h480/49.jpg" width="640" /></a></div><div style="text-align: left;">Then I replaced the two 1uF electrolytic capacitors and the BC142 power transistor on the PCB:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXRJ94CXaUo_LOXn0nytFk3Tsnwmw2TWjdkMe86NBzaxOOiTgJf3RnIF2HwpZwtOHrX-Nt_2LfBYyc9Zok6fQBryFJvgaUM55eyv_hUXHi1N1uXIBpoMDmylC_ufE6QsEPWf_c6VJIuLwQVfSfoQLLOS0JmufhIDTCcZH7lsUPfW1XE08rhSZX5KKAAy4/s1200/50.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXRJ94CXaUo_LOXn0nytFk3Tsnwmw2TWjdkMe86NBzaxOOiTgJf3RnIF2HwpZwtOHrX-Nt_2LfBYyc9Zok6fQBryFJvgaUM55eyv_hUXHi1N1uXIBpoMDmylC_ufE6QsEPWf_c6VJIuLwQVfSfoQLLOS0JmufhIDTCcZH7lsUPfW1XE08rhSZX5KKAAy4/w640-h480/50.jpg" width="640" /></a></div><div style="text-align: left;">In the meantime the oil infusion process had completed and it was time to put the main capacitor array and the platter motor back together. But first I installed a <a href="https://beolover.com/products/24v-zener-diode-for-beogram-4000-power-supply" target="_blank">new 3W 24V Zener diode</a>:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRTlByCdiurmyqCxnQRXRWhCb2hcxsUAS721bmdo74oUtwarrjUKvVc5kXkNnc9bQT-RWObfhYsA-XdZtmN8nxL_UTRA7HJLM2gvM56Jx9V5A8S7pJTHhKhxXWbD2Ydord0yxourcelbNtkM20nAMcpzT7PuZoQBWI3TdbxCaL6Myyv2JniC9HCBADwF0/s1200/51.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRTlByCdiurmyqCxnQRXRWhCb2hcxsUAS721bmdo74oUtwarrjUKvVc5kXkNnc9bQT-RWObfhYsA-XdZtmN8nxL_UTRA7HJLM2gvM56Jx9V5A8S7pJTHhKhxXWbD2Ydord0yxourcelbNtkM20nAMcpzT7PuZoQBWI3TdbxCaL6Myyv2JniC9HCBADwF0/w640-h480/51.jpg" width="640" /></a></div><div style="text-align: left;">The original Zeners are under-dimensioned at 1W and tend to get pretty hot, which drives their voltage out of spec causing the 24V rail to actually have 25-27V. Not great. The installation of a stronger Zener solves this issue and the voltage is reliably set to 24V.</div></div><div><div style="text-align: left;">This shows the <a href="https://beolover.com/products/main-capacitors-kit-for-beogram-4000" target="_blank">new capacitors </a>and the re-assembled motor installed:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5ZRSqmQmFEPP5HULPs62ZWOy-GenNJpTBWz9xgZDTql7N3cIwgJsrW9JvPDZA-kBm7KuP0hIoXiFJyDGhO_-qJiZCr3w0g2rRoJWKA9u3lk_TJdIpkREZTdllDLK5hnD2Mb8PjF6q1Lu6PBp_sIIL0COorbx29t53JkH794Ye72A-YfRybZd-B-u3sk4/s1200/52.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi5ZRSqmQmFEPP5HULPs62ZWOy-GenNJpTBWz9xgZDTql7N3cIwgJsrW9JvPDZA-kBm7KuP0hIoXiFJyDGhO_-qJiZCr3w0g2rRoJWKA9u3lk_TJdIpkREZTdllDLK5hnD2Mb8PjF6q1Lu6PBp_sIIL0COorbx29t53JkH794Ye72A-YfRybZd-B-u3sk4/w640-h480/52.jpg" width="640" /></a></div><div style="text-align: left;">While the main PCB is up, it is a good moment to replace the power transistors of the push-pull stage of the AC motor driver. These transistors are usually TIP31/32 pairs. They are bolted to the enclosure for enhanced cooling:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgRrxQ2hauL4vNpFK2izRi-tKurljfex_UGcujNKT-PxgyKMhM7N0h_ssgtmyKolpQHMEb0TLfIGNwb6rGVI5XZQIh0klT4H-lLm2hDoBkKZmJEl9hZvQ8ozbhKPcFyxc-65ivLeGozxg6WNzZTXzFcR7YR9TbAw6cPebmXvoOQBgQt6QmhTwJdo0c0dlw/s1200/53.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgRrxQ2hauL4vNpFK2izRi-tKurljfex_UGcujNKT-PxgyKMhM7N0h_ssgtmyKolpQHMEb0TLfIGNwb6rGVI5XZQIh0klT4H-lLm2hDoBkKZmJEl9hZvQ8ozbhKPcFyxc-65ivLeGozxg6WNzZTXzFcR7YR9TbAw6cPebmXvoOQBgQt6QmhTwJdo0c0dlw/w640-h480/53.jpg" width="640" /></a></div><div style="text-align: left;">I replaced them with stronger TIP41/42s:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgTjT1oz-YXp4DVnO_yKfhEjPFFra0iATbKI_IME1-lXvyUxLaY7eQBj10eoGv76lonx-_mJJcigrOio288AOq-XRf1QS3-Z5roHGg_PwQmfocB7GgOQf-d54UKtoO_v7vW5RoxBPpLNzaPimKOj3oxNXDLV731j94PjEdooZ_uCTEELN6QuTEBVVJMPsM/s1200/54.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgTjT1oz-YXp4DVnO_yKfhEjPFFra0iATbKI_IME1-lXvyUxLaY7eQBj10eoGv76lonx-_mJJcigrOio288AOq-XRf1QS3-Z5roHGg_PwQmfocB7GgOQf-d54UKtoO_v7vW5RoxBPpLNzaPimKOj3oxNXDLV731j94PjEdooZ_uCTEELN6QuTEBVVJMPsM/w640-h480/54.jpg" width="640" /></a></div><div style="text-align: left;">Before I completed my work on the main PCB, I adjusted the sensor transistor bias with the newly installed <a href="https://beolover.com/products/sensor-transistor-and-biasing-trimmer-beogram-4002-4-and-4000" target="_blank">5MOhm 25 turn trimmer </a>to the specified 1.8V DC at the collector:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVtRTPjrSqqKpLsrhf3C_pNbi2D_UWfqASWw6GOuBtPp0wIEFnyGLVu7CjuBJr8iA6WyGcFifgVSywJ_mdrPk9PIE8zDHC9SG6rxvVYj3RwB8sTtHVRO9Xv4Y2fMkEwn-E3wY9b2jsrmj9SiXa2c_qa0EN7Zwcr94VvRs-Z0kRBTtaLIeH2EhVSRzBtPc/s1200/55.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVtRTPjrSqqKpLsrhf3C_pNbi2D_UWfqASWw6GOuBtPp0wIEFnyGLVu7CjuBJr8iA6WyGcFifgVSywJ_mdrPk9PIE8zDHC9SG6rxvVYj3RwB8sTtHVRO9Xv4Y2fMkEwn-E3wY9b2jsrmj9SiXa2c_qa0EN7Zwcr94VvRs-Z0kRBTtaLIeH2EhVSRzBtPc/w640-h480/55.jpg" width="640" /></a></div><div style="text-align: left;">Then I moved the adjusted trimmer to the component side:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgHViBTFmOzSU7ohyphenhyphen0oN5waEy5fK9Swdt4S9yTWi5Ca6VF8eCQ4qglWIK6Cp3TXI1lRg22sHl3n7dTph7HpNBxUBvqwFyMJG0bDewMVueAALxWHPcJcMAVblUkmKwf9HpG0KAhygZoD04ruZunONp0i5Hf39nJklkSNWq5u4Qo0Cmsxw_PakNqa6Tsmzr8/s1200/56.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgHViBTFmOzSU7ohyphenhyphen0oN5waEy5fK9Swdt4S9yTWi5Ca6VF8eCQ4qglWIK6Cp3TXI1lRg22sHl3n7dTph7HpNBxUBvqwFyMJG0bDewMVueAALxWHPcJcMAVblUkmKwf9HpG0KAhygZoD04ruZunONp0i5Hf39nJklkSNWq5u4Qo0Cmsxw_PakNqa6Tsmzr8/w640-h480/56.jpg" width="640" /></a></div><div style="text-align: left;">After completing the main PCB I moved on to the keypad cluster. I removed it and put it into service position:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirXTmiTrD3LsqrhyG6qwVQmKrCB1Qp5LqYI4ZBqaXsf9uvEKBEf-hmDVKsQryXk1jBub3G-aFOsOQNDeMXz-EqTH3R2QeOCT3hPzC2MqEz2RHWPMiIzHKGQsA6-KEasp_EF0tpgORc3coTsIhg8GXe0F9qmVJOhHDCM-iTbnFUIRNaUeVUvzvJN0KaBlw/s1200/57.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirXTmiTrD3LsqrhyG6qwVQmKrCB1Qp5LqYI4ZBqaXsf9uvEKBEf-hmDVKsQryXk1jBub3G-aFOsOQNDeMXz-EqTH3R2QeOCT3hPzC2MqEz2RHWPMiIzHKGQsA6-KEasp_EF0tpgORc3coTsIhg8GXe0F9qmVJOhHDCM-iTbnFUIRNaUeVUvzvJN0KaBlw/w640-h480/57.jpg" width="640" /></a></div><div style="text-align: left;">This revealed the four incandescent bulbs that back-illuminate the user-accessible RPM trimmers as well as the carriage position scale</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkAMO0-68yZEMcDOv4Ckf5FVyl-gEW_E4es544k4PiP374tKnop9Zu8OYeMdmKt85loqrSy_p2BsIuQE0wO0LXOh6x_T9oIIgYYnwnZaiRxqGIkneg6OIB-X2ZoKEF2UWqhXtWldxKx_SJIElhe1VJsaOnuhqUMXEH3KnyGlubm9e8o9zoTiPukREd71o/s1200/58.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkAMO0-68yZEMcDOv4Ckf5FVyl-gEW_E4es544k4PiP374tKnop9Zu8OYeMdmKt85loqrSy_p2BsIuQE0wO0LXOh6x_T9oIIgYYnwnZaiRxqGIkneg6OIB-X2ZoKEF2UWqhXtWldxKx_SJIElhe1VJsaOnuhqUMXEH3KnyGlubm9e8o9zoTiPukREd71o/w640-h480/58.jpg" width="640" /></a></div><div style="text-align: left;">and the switch terminals that are controlled via the keypad:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmY-yNbm9MHyiRlY1PkYpJ6m01MvuQaxM5aVIdxp7pSRDw0uBKAU0hbvTMPwT3G7S7uGwdHN5X9_zszKgSJM7pxl1AZHUfmQPRkKcjmf7ggNWkkTVwRzElqTypmUyRR89yR_ZJGg9hUYL1VgyJHnrD6wVjYpriPqKAo6N_GL0Hf0-hItDM-hYgA9t05T0/s1200/59.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmY-yNbm9MHyiRlY1PkYpJ6m01MvuQaxM5aVIdxp7pSRDw0uBKAU0hbvTMPwT3G7S7uGwdHN5X9_zszKgSJM7pxl1AZHUfmQPRkKcjmf7ggNWkkTVwRzElqTypmUyRR89yR_ZJGg9hUYL1VgyJHnrD6wVjYpriPqKAo6N_GL0Hf0-hItDM-hYgA9t05T0/w640-h480/59.jpg" width="640" /></a></div><div style="text-align: left;">I removed all of the terminals for nickel/gold plating. This shows them in their original oxidized condition:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjEbaspuuv8xBWK8sPsJALoj64xASO6TZryeAvpYSS0nEQSn73Aoz2hDuipHjseNxgNwlQ5g9eW0ofHlq_QeDDtg9XmJKQBjucW_jJnaraJyOsgrRRt7wrkGFbVcdF-7RcKoj34GEgSOaX-Quo_LBbiXnXLnzplsmn_CkxkF6JoTyfcD7bSg4-PEdlxpz0/s1200/60.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjEbaspuuv8xBWK8sPsJALoj64xASO6TZryeAvpYSS0nEQSn73Aoz2hDuipHjseNxgNwlQ5g9eW0ofHlq_QeDDtg9XmJKQBjucW_jJnaraJyOsgrRRt7wrkGFbVcdF-7RcKoj34GEgSOaX-Quo_LBbiXnXLnzplsmn_CkxkF6JoTyfcD7bSg4-PEdlxpz0/w640-h480/60.jpg" width="640" /></a></div><div style="text-align: left;">And after the plating process:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhxgB8utzAQ4Qoa_7Iqwa3iBYGvq_48RtOWEvkvhUZDtjpZzhJnznLd2SSV8qPd8iVKFCf44BA18YNMzrsUIRWiyf5IoJ6OO5SQuFR9fhoHHU-FxQw5WN81fYFGH6tHJ6tFe6-yEBxn8wj9tSlMjvm74aP7eTqI2cAQdDJVL0n8kim8KVE4CoNFx4a4GLw/s1200/61.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhxgB8utzAQ4Qoa_7Iqwa3iBYGvq_48RtOWEvkvhUZDtjpZzhJnznLd2SSV8qPd8iVKFCf44BA18YNMzrsUIRWiyf5IoJ6OO5SQuFR9fhoHHU-FxQw5WN81fYFGH6tHJ6tFe6-yEBxn8wj9tSlMjvm74aP7eTqI2cAQdDJVL0n8kim8KVE4CoNFx4a4GLw/w640-h480/61.jpg" width="640" /></a></div><div style="text-align: left;">I re-assembled the switches:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLKoqonF0msfyjK2YS_reOECnfaFgB7kyHh7Jg8_BVT5o5K2Bn7v3sGBv7_sLx7y-r-nk5PfblCBIOog1FEsPvk2pfMZbJEjxtOf408R4avTW8RcTt4PUB4XpRvdKu45Ezh7axtQNmI_SLKXuxcS8_ujcJuLyjIp6xp5wnkVr-J8vi0FPuuElopZ0u6yI/s1200/62.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLKoqonF0msfyjK2YS_reOECnfaFgB7kyHh7Jg8_BVT5o5K2Bn7v3sGBv7_sLx7y-r-nk5PfblCBIOog1FEsPvk2pfMZbJEjxtOf408R4avTW8RcTt4PUB4XpRvdKu45Ezh7axtQNmI_SLKXuxcS8_ujcJuLyjIp6xp5wnkVr-J8vi0FPuuElopZ0u6yI/w640-h480/62.jpg" width="640" /></a></div><div style="text-align: left;">Beogolden!...;-). Then I installed BeoloverLED boards to replace the <a href="https://beolover.com/products/scale-illumination-leds-for-beogram-4000" target="_blank">carriage position back-lighting bulbs</a> and <a href="https://beolover.com/products/rpm-trimmer-illumination-leds-for-beogram-4000" target="_blank">regular 5mm LEDs with suitable resistors</a> to replace the bulbs of the trimmers. You can see the 33 RPM LED lit up in this picture:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPjooYPTn3WMpMxjApaV7bvAu-8K-y5L7mXbhJ3Y3ufOdN0qC-Q0Lrg_kT0_xV2C05nKww2yUiP6agYQtvUvEVentS1FOSbOb9Q8dSV-fDeC0ZMWQjlDXgTH7ZpT3CVHhzmCZlbR37Y0JA1xnHOBBqaBx1oNhyphenhyphenG9UYWTlqz03nlL2qJ2S0mBsvTAqkdHY/s1200/63.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPjooYPTn3WMpMxjApaV7bvAu-8K-y5L7mXbhJ3Y3ufOdN0qC-Q0Lrg_kT0_xV2C05nKww2yUiP6agYQtvUvEVentS1FOSbOb9Q8dSV-fDeC0ZMWQjlDXgTH7ZpT3CVHhzmCZlbR37Y0JA1xnHOBBqaBx1oNhyphenhyphenG9UYWTlqz03nlL2qJ2S0mBsvTAqkdHY/w640-h480/63.jpg" width="640" /></a></div><div style="text-align: left;">The final incandescent bulb that needed replacement was the one in the sensor arm. This shows the small sensor compartment pulled out from the end of the sensor arm together with <a href="https://beolover.com/products/copy-of-tracking-sensor-led-light-source-beogram-4002-4" target="_blank">the LED board and positioning aid</a>:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhpFxjxTNhdcEIx3iyNL53WBGjWO9TW1wcKyLsxOvDi5BbGLDH_Wu6ZLpexWczbELYZnv5XFzKjVuROMfDW3_iH5wDxihizTtgZDw1WfGGe0MMEa1KrPR9pIhjfwPHkjWjiJLUB-68qCb-4hcX2g9aFOdvo5LZUHI_YHB3Qh-UBATIdl-Mmay9JlnqltXI/s1200/64.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhpFxjxTNhdcEIx3iyNL53WBGjWO9TW1wcKyLsxOvDi5BbGLDH_Wu6ZLpexWczbELYZnv5XFzKjVuROMfDW3_iH5wDxihizTtgZDw1WfGGe0MMEa1KrPR9pIhjfwPHkjWjiJLUB-68qCb-4hcX2g9aFOdvo5LZUHI_YHB3Qh-UBATIdl-Mmay9JlnqltXI/w640-h480/64.jpg" width="640" /></a></div><div style="text-align: left;">I removed the original bulb and placed the LED assembly:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXAQcMUCNvLyHK70BmuhPSoD0WdULLQSaHcE-ZqjIYbtj9MglcyZXEvKq6HdxyBdFf8tP7D3-Vq7U8AWr2F-sCQ7tZVoETySOloJ3xBFTx3X1kFpOeZDa6AI35nxjJMaV0kz6iOePHCKej6ntiLSSpW_H4IyFAGDIdsXVFCPa0dBD37c4bB3LBvoUXXco/s1200/65.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXAQcMUCNvLyHK70BmuhPSoD0WdULLQSaHcE-ZqjIYbtj9MglcyZXEvKq6HdxyBdFf8tP7D3-Vq7U8AWr2F-sCQ7tZVoETySOloJ3xBFTx3X1kFpOeZDa6AI35nxjJMaV0kz6iOePHCKej6ntiLSSpW_H4IyFAGDIdsXVFCPa0dBD37c4bB3LBvoUXXco/w640-h480/65.jpg" width="640" /></a></div><div style="text-align: left;">This restoration was coming to a close and so it was time to focus on the signal path. First I installed a switch that allows connecting signal and system grounds:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjL2zshCWSvJAGPZ_XVZEywSkevEJScfh9eHKJbbKedaJBM_OxqV3Ufu-RKzsqC78wZ62Vw9Rs3J-nqQcH1apJTys792OU0Qv53oCFewS5faLvGRsbmXcPm_df8IkWVZF5lsu81cVCHSdehx5fJ9LZVi3spQYGWIS7R1ysNBL1jx0kZ_vi0p-be2nPlaPY/s1200/66.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjL2zshCWSvJAGPZ_XVZEywSkevEJScfh9eHKJbbKedaJBM_OxqV3Ufu-RKzsqC78wZ62Vw9Rs3J-nqQcH1apJTys792OU0Qv53oCFewS5faLvGRsbmXcPm_df8IkWVZF5lsu81cVCHSdehx5fJ9LZVi3spQYGWIS7R1ysNBL1jx0kZ_vi0p-be2nPlaPY/w640-h480/66.jpg" width="640" /></a></div><div style="text-align: left;">Connecting system and signal grounds is usually a good way to quench any hum issues that may arise, especially when connecting a Beogram to a RCA input amplifier. </div></div><div><div style="text-align: left;">The next step was replacing the original as usual corroded DIN5 plug:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAfWzvRQ-xqOhD7HLjto03OHyu_jIJvjArw36EDjP02vLiGJpOocBNEUOBQ8dSYZa4chVNg458Q4uVDY5Yn2S0fx_zxCd85tGQciW-a4XPpic3oUYvB0ptwjbXjnKfBwZmjHA8ubgv7KCU52EdVK-yKVjM4EcQvtL5UWX8I_k44S7RuHyVMbMzFMXIzwE/s1200/67.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAfWzvRQ-xqOhD7HLjto03OHyu_jIJvjArw36EDjP02vLiGJpOocBNEUOBQ8dSYZa4chVNg458Q4uVDY5Yn2S0fx_zxCd85tGQciW-a4XPpic3oUYvB0ptwjbXjnKfBwZmjHA8ubgv7KCU52EdVK-yKVjM4EcQvtL5UWX8I_k44S7RuHyVMbMzFMXIzwE/w640-h480/67.jpg" width="640" /></a></div><div style="text-align: left;">I installed a nice all-metal modern plug with gold plated terminals:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZF0hOtolIuxYOZ4E5cnhtqGW6sdhcp7fAgBEZSWET7Zwxo5723MzohQUHtVpO5JCT-xsfOUagaTi91CJaw1m4OErffeAYBBJHpSHoPI76wKW5i1kiGM6Ez1OVmX3a_XhCl1WkrGw53z4tv_Spb9r9N05II_rN12-UN5ea5Y0gZTbShRzr-MwAD8ul9GY/s1200/68.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZF0hOtolIuxYOZ4E5cnhtqGW6sdhcp7fAgBEZSWET7Zwxo5723MzohQUHtVpO5JCT-xsfOUagaTi91CJaw1m4OErffeAYBBJHpSHoPI76wKW5i1kiGM6Ez1OVmX3a_XhCl1WkrGw53z4tv_Spb9r9N05II_rN12-UN5ea5Y0gZTbShRzr-MwAD8ul9GY/w640-h480/68.jpg" width="640" /></a></div><div style="text-align: left;">Before I started on the adjustments, I replaced the cracked plinth guidance washers. This shows one of the cracked original ones:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgTeGmvf2loLDJVmzGjHGv5T7Npp4_KvNrLqJ2fyIfrUM7p7tTzyK3YW39mp-sfOFcyJeMTf08wjv-_pxyAp5PigC_JeuRfRMZJ1KpRek9RNdzBmDyxxQ5bI8BvptW3Fg7SR8uxtnZfzrtagmec1Gg8luufsw18rRm3VWdhcSzrRFPToB-OERX8Dqdpn-s/s1200/69.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgTeGmvf2loLDJVmzGjHGv5T7Npp4_KvNrLqJ2fyIfrUM7p7tTzyK3YW39mp-sfOFcyJeMTf08wjv-_pxyAp5PigC_JeuRfRMZJ1KpRek9RNdzBmDyxxQ5bI8BvptW3Fg7SR8uxtnZfzrtagmec1Gg8luufsw18rRm3VWdhcSzrRFPToB-OERX8Dqdpn-s/w640-h480/69.jpg" width="640" /></a></div><div style="text-align: left;">I replaced all five with <a href="https://beolover.com/products/plinth-guide-washer-set-for-beogram-4000-4002-and-4004" target="_blank">Beolover nylon guide washers</a>:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiihdECFxNbumLQFy8e_nJOmEEA6B312OLtXkzFe5jtyBnghrF1KKX1fF59EAqPy5w1HO5k8-yr9vFAJOy351EKqP5oZpb2ldPnhOStJ7l9l9tN-Nd5nFLSZVQ3tXqBGJg0TdokbFHQ-YZPaovVF1S9l8yOCqBEQFN3wYlaQWhpn57yIzd-nL8KkEGt1KA/s1200/70.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiihdECFxNbumLQFy8e_nJOmEEA6B312OLtXkzFe5jtyBnghrF1KKX1fF59EAqPy5w1HO5k8-yr9vFAJOy351EKqP5oZpb2ldPnhOStJ7l9l9tN-Nd5nFLSZVQ3tXqBGJg0TdokbFHQ-YZPaovVF1S9l8yOCqBEQFN3wYlaQWhpn57yIzd-nL8KkEGt1KA/w640-h480/70.jpg" width="640" /></a></div><div style="text-align: left;">Then it was time to do the adjustments of the floating chassis, platter to arm distance, arm parallelism and platter height. This process can be a bit iterative until the sweet spot has been found. Don't give up if you try this at home. Beopatience!...;-)</div><div style="text-align: left;">Then I installed a nut on the counterweight adjustment screw. In its original setup it is just held in place with a retaining washer that sometimes is glued in place:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhniw6T2bpeV-yOWQXyy46jWJPiMjDA6kCJaXCmwAOjkBzEqiovwHMyjOTaFjSg4OPxfR6MTPkMDKhmhG7LxJbnIW9ttBFq0TJnrStl-LejDIYK9phHGfQMXDKTKy7Zs_U4VvzwOXQYI2iUCK9u3y4UOvJyfGcRj-WPotozIRSyJ4bK3o_FdevAd-uTm-M/s1200/71.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhniw6T2bpeV-yOWQXyy46jWJPiMjDA6kCJaXCmwAOjkBzEqiovwHMyjOTaFjSg4OPxfR6MTPkMDKhmhG7LxJbnIW9ttBFq0TJnrStl-LejDIYK9phHGfQMXDKTKy7Zs_U4VvzwOXQYI2iUCK9u3y4UOvJyfGcRj-WPotozIRSyJ4bK3o_FdevAd-uTm-M/w640-h480/71.jpg" width="640" /></a></div><div style="text-align: left;">I removed the washer and put in a square M3 nut which allows tightening the adjustment screw in place. This ensures that my weight calibration survives the rigors of transport:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtgkMThq9G73q5xSqf9N8zWaPm9v66tkcoTlAWKJ2Bw8XCchmC0ZrNGBkEPesU9aEFXucPPFscxBjnalcAtDE6X2C4O5wP8AriIC0Qdf6v7hWvtDjja29nx0uSS9Xjt4z7wIgOgP_y0PQ8Npm1wGe4cS90N2OnPBYiBI-qR0WWljhe1sMrDvTsm9rVn1s/s1200/72.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtgkMThq9G73q5xSqf9N8zWaPm9v66tkcoTlAWKJ2Bw8XCchmC0ZrNGBkEPesU9aEFXucPPFscxBjnalcAtDE6X2C4O5wP8AriIC0Qdf6v7hWvtDjja29nx0uSS9Xjt4z7wIgOgP_y0PQ8Npm1wGe4cS90N2OnPBYiBI-qR0WWljhe1sMrDvTsm9rVn1s/w640-h480/72.jpg" width="640" /></a></div><div style="text-align: left;">Next I adjusted the arm lowering limit to stop the needle from going beyond about 1 mm above the lower parts of the platter ribs:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipapEk1h21dLNRSvX2vcdH1VDOLu8-wGVZe4hmxvXnM2PIjlNueEwWxdx8Nzy6d1FpF_kJH0RRniQYGojzA-yV01OX8PRFOs6Qk4_euUwXTt-6XWwh7fng1cWHoTnMW7UCzTwz2bkqbX7wyalAofBPUhGwBdQ5cmA__IMBV9jzuNTB-4BS0KRGDV1dDg0/s1200/73.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipapEk1h21dLNRSvX2vcdH1VDOLu8-wGVZe4hmxvXnM2PIjlNueEwWxdx8Nzy6d1FpF_kJH0RRniQYGojzA-yV01OX8PRFOs6Qk4_euUwXTt-6XWwh7fng1cWHoTnMW7UCzTwz2bkqbX7wyalAofBPUhGwBdQ5cmA__IMBV9jzuNTB-4BS0KRGDV1dDg0/w640-h480/73.jpg" width="640" /></a></div><div style="text-align: left;">This important adjustment ensures survival of the tip should the arm ever get lowered on an empty rotating platter in case of a record detection circuit malfunction.</div></div><div><div style="text-align: left;">After this I calibrated the tracking weight with a digital scale to yield 1.2g at the 1.2g scale setting:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUg2HJc40z9RpJBYndJ_McTtmBjkmFOUSjUX2SFqL_4neH-fElfSXqVk6QYOdvkU4cNXtE9zuxAYzJvNMviir1VUShDhMjq6xJzGhFGx9aPUS6sgs8V8cJ7oeBfobBz666-I9Vz6TJQnDIMI1k_wOFo1GMO0UNY-NbQ0UiSeKzSTQAMosmKJ0u82SycG8/s1200/74.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgUg2HJc40z9RpJBYndJ_McTtmBjkmFOUSjUX2SFqL_4neH-fElfSXqVk6QYOdvkU4cNXtE9zuxAYzJvNMviir1VUShDhMjq6xJzGhFGx9aPUS6sgs8V8cJ7oeBfobBz666-I9Vz6TJQnDIMI1k_wOFo1GMO0UNY-NbQ0UiSeKzSTQAMosmKJ0u82SycG8/w640-h480/74.jpg" width="640" /></a></div><div style="text-align: left;">The weight adjustment dials in Beogram 400x are notoriously inaccurate over their entire scale. Therefore, it is best to calibrate them to be accurate around the 1.2g setting, which is the tracking weight of most B&O cartridges.</div></div><div><div style="text-align: left;">Now it was time to adjust the tracking feedback to ensure a proper arm alignment during play:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4djIHltIKaYsXSIKuH6NfONU3JQVRtRwTfRhDzA5yD2jXrbMYGDFXJDmxNZ2zFIBF7vmswHE0-ODgFLMINx0bpFmSj_FE4mXqYlgq48PZIvN2EJHeKq_rU3vok3wIsgNnJ7zM7ql9DmVnDvgIfu8iN-va8naoDSfHoNlGce_qqoOXJtQCO6aFMBpwrYg/s1200/75.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4djIHltIKaYsXSIKuH6NfONU3JQVRtRwTfRhDzA5yD2jXrbMYGDFXJDmxNZ2zFIBF7vmswHE0-ODgFLMINx0bpFmSj_FE4mXqYlgq48PZIvN2EJHeKq_rU3vok3wIsgNnJ7zM7ql9DmVnDvgIfu8iN-va8naoDSfHoNlGce_qqoOXJtQCO6aFMBpwrYg/w640-h480/75.jpg" width="640" /></a></div><div style="text-align: left;">Before playing a first record I measured the RPM stability of the platter drive with the <a href="https://beolover.com/products/beoloverrpm-precise-rpm-calibration-for-your-beogram" target="_blank">newly re-designed BeoloverRPM device</a>:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXzb6leDmSlj0333RsMEOmctZQ2x4BHMX01rxnPO4FSu19D6NAtb0Pl2oK98sRn7TwYDW7XOsDq1WC7VfSibNtK4AndX0NEaGUO3Bvou0IgSgvW9SEIUOz82btc3x2XvhpSXzIv-hll7lBCePwwtnaFgi_SlhMv6VBY_kfxy4UWFVNSjipNWe_9o9anYs/s1200/76.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="675" data-original-width="1200" height="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXzb6leDmSlj0333RsMEOmctZQ2x4BHMX01rxnPO4FSu19D6NAtb0Pl2oK98sRn7TwYDW7XOsDq1WC7VfSibNtK4AndX0NEaGUO3Bvou0IgSgvW9SEIUOz82btc3x2XvhpSXzIv-hll7lBCePwwtnaFgi_SlhMv6VBY_kfxy4UWFVNSjipNWe_9o9anYs/w640-h360/76.jpg" width="640" /></a></div><div style="text-align: left;">It allows a precise adjustment of the RPM as well as logging the RPM in 10s intervals. Perfect for detecting intermittent RPM inconstancies.</div><div class="separator" style="clear: both; text-align: left;"><br /></div><div style="text-align: left;">The serial port connection simultaneously transmits all data points to the connected PC, which allows detailed monitoring of the RPM over extended periods of time.</div></div><div style="text-align: left;">This graph shows a 24 hrs measurement:</div><div style="text-align: left;"><br /></div><div class="separator" style="clear: both; text-align: left;"><br /></div><div style="margin-left: 1em; margin-right: 1em; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjT1sW9tD0MicbkOltl9g38OdiyI5XeV3mUTkxjr65PZRgndshpkT5hyphenhyphencrPbnrm2BQhqASEGVRph7bbpvhbnu0UbL_Z0TCCJ7cprXju5athfj9uq2m0vKddFcGVql0hKeW_OhlNC_dddasJyBqA8Vq9oyLkIj0dZoBDK2KhKXHvSZEfksDoQc9WcUmvGHY/s1024/Beogram%204000%20RPM%20stability.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="593" data-original-width="1024" height="370" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjT1sW9tD0MicbkOltl9g38OdiyI5XeV3mUTkxjr65PZRgndshpkT5hyphenhyphencrPbnrm2BQhqASEGVRph7bbpvhbnu0UbL_Z0TCCJ7cprXju5athfj9uq2m0vKddFcGVql0hKeW_OhlNC_dddasJyBqA8Vq9oyLkIj0dZoBDK2KhKXHvSZEfksDoQc9WcUmvGHY/w640-h370/Beogram%204000%20RPM%20stability.jpg" width="640" /></a></div><div style="text-align: left;"><br /></div><div style="text-align: left;">This is pretty much as good as it gets. The slow drift of the RPM is a result of the profound temperature change in my work shop between winter days and nights in Albuquerque, NM.</div><div style="text-align: left;"><br /></div><div><div style="text-align: left;">I also measured the motor voltage with the oscilloscope. A nice sine curve together with high motor torque indicated that the motor department was working well:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgTVzK7RZDEUYnyaw4T5gz69fGeIm8trv1VLQsvHaQgdU9DfZ8SNxvWuAma8tU7YVbmPiTo3X4Pdg9VneX0nQFlGBX4jfFA4UbRmtVjkTAbvmoee11-uQjy5zBirXndNBZ4764PSABtg66smRAEGtJ8fsVOuSC1k4ps5vu6kW6-lRlRwTImB2LALWaoBhw/s1200/78.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="913" data-original-width="1200" height="486" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgTVzK7RZDEUYnyaw4T5gz69fGeIm8trv1VLQsvHaQgdU9DfZ8SNxvWuAma8tU7YVbmPiTo3X4Pdg9VneX0nQFlGBX4jfFA4UbRmtVjkTAbvmoee11-uQjy5zBirXndNBZ4764PSABtg66smRAEGtJ8fsVOuSC1k4ps5vu6kW6-lRlRwTImB2LALWaoBhw/w640-h486/78.jpg" width="640" /></a></div><div style="text-align: left;">The final measurement was the record detection sensor response. In the 4000 the amplitude should exceed ~2.2V, which was easily achieved:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiu_LJEkaZ0RLtlrSk4wktPP2hKoBd5PVXXIglRAl4f6D9q1jNhjrLssZF8OydGLZuaF5i7AbtFMjFDK2GVdHGfTaYtPiVCH5dts7mlNvbiCjj9hLzXTLwLNj-cXgKiDQEFKV_KEyka08BVMi_va9LwMNZo8c_DNpMApL_365tr1ynVxfuf5JAohQphn-8/s1200/79%20measured%20with%20bulb.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="904" data-original-width="1200" height="482" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiu_LJEkaZ0RLtlrSk4wktPP2hKoBd5PVXXIglRAl4f6D9q1jNhjrLssZF8OydGLZuaF5i7AbtFMjFDK2GVdHGfTaYtPiVCH5dts7mlNvbiCjj9hLzXTLwLNj-cXgKiDQEFKV_KEyka08BVMi_va9LwMNZo8c_DNpMApL_365tr1ynVxfuf5JAohQphn-8/w640-h482/79%20measured%20with%20bulb.jpg" width="640" /></a></div><div style="text-align: left;">And now it was finally time to enjoy this fully restored Beogram 4000 by playing a nice record. My customer sent me a present along with this deck, an audiophile pressing of the seminal Bill Evans Trio recording "Waltz for Debbie", which was recorded live on June 25, 1961 at the Village Vanguard. What a perfect combination with this great looking deck! Like all newly pressed records I cleaned this vinyl ultrasonically to remove any release agent residues before I played it. This was done on a <a href="https://www.cleanervinyl.com/shop-proxl-system.html" target="_blank">CleanerVinyl ProXL</a> setup combined with a UC-8360 high frequency 132 kHz ultrasonic.</div></div><div><div style="text-align: left;">My favorite track on this album is Milestones, a famous Miles Davis composition.</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnn39FCx5ey8oQHD-qbK1bmlkq6DL74jGXb6jbtsSpRhwuoyqVk9D_4UFNgrM3YzBdBmcXbHsZ5VI-LkyS7j5jq9_GAUWi9v-7GuCTsFM74dRS96mCjlHpl0YA8qkC7W983vMatn9P15nxot1eV3Ape7TbU8r2QZXO9Y5Teg7ni-xTxEB9KRugoz0UxlU/s1200/80.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnn39FCx5ey8oQHD-qbK1bmlkq6DL74jGXb6jbtsSpRhwuoyqVk9D_4UFNgrM3YzBdBmcXbHsZ5VI-LkyS7j5jq9_GAUWi9v-7GuCTsFM74dRS96mCjlHpl0YA8qkC7W983vMatn9P15nxot1eV3Ape7TbU8r2QZXO9Y5Teg7ni-xTxEB9KRugoz0UxlU/w640-h480/80.jpg" width="640" /></a></div><div style="text-align: left;">While I was enjoying this restored deck, I worked on replacing the original scratched up hood with a new one from the beoparts-store in Denmark.</div><div style="text-align: left;">But first I needed to fix the hood hinge that had started to corrode:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhg8gmdwZxKcS2N81gOyUmuyN1iuyHySBt9Wfsail7TQRBP8GzjRvwuCHXWHzWzpsZVnrgvfFH5zf9C3RTA_yABFmD0yWeExe003MrW9QOGO6sGbryOWSHWtImTzY_QrYqchtFtsR8mUmbgae98nyUhSCe7RsMWdx2Nbdi-X0IUTLjwDGz4rZtJdGvtf6g/s1200/IMG_3777.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhg8gmdwZxKcS2N81gOyUmuyN1iuyHySBt9Wfsail7TQRBP8GzjRvwuCHXWHzWzpsZVnrgvfFH5zf9C3RTA_yABFmD0yWeExe003MrW9QOGO6sGbryOWSHWtImTzY_QrYqchtFtsR8mUmbgae98nyUhSCe7RsMWdx2Nbdi-X0IUTLjwDGz4rZtJdGvtf6g/w640-h480/IMG_3777.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiePgQMf_Dktwt8DRCLDKXGo8R2x_WDzBDkg4YW_ZDyJLfU0KVQgQoWOnpDHCJGAOgi_-6yCRzdsrSWDZmJQa5cuuQCCfWuMzBs9d21m0miOMyq3Hp9q8Z4j_-U9F7jsahal0rEz8pw32pdVyWU2iONFn-z1EVh8H-ehCfB135X34e4MLwtzsNg61X3t4Y/s1200/IMG_3778.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiePgQMf_Dktwt8DRCLDKXGo8R2x_WDzBDkg4YW_ZDyJLfU0KVQgQoWOnpDHCJGAOgi_-6yCRzdsrSWDZmJQa5cuuQCCfWuMzBs9d21m0miOMyq3Hp9q8Z4j_-U9F7jsahal0rEz8pw32pdVyWU2iONFn-z1EVh8H-ehCfB135X34e4MLwtzsNg61X3t4Y/w640-h480/IMG_3778.jpg" width="640" /></a></div>I sanded the corroded areas and then spray-painted them with satin black. The next step was to align the new aluminum trim with the hood to be centered. I usually place a strip of blue tape and then align the strip with two 3D printed alignment tools before I mark the position with pencil:<br /><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVGZxihUM58vTT4UQfZQ6FRl9dXdmFZPbUETbSSGhFd_wRVPqoGCERsr8coQmkS3yAqJE-kT42GLoLO03HF5sGSfS6YhZUXtL3kuifkV5B2gR26bKhwnDRvWRRaiF0OOW6qePe4-HQO-FXw1yN-sSIx9Q00rUC8s7hUEzC3oSWRgt_Xs_-5LkkANSfoJw/s1200/IMG_3980.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVGZxihUM58vTT4UQfZQ6FRl9dXdmFZPbUETbSSGhFd_wRVPqoGCERsr8coQmkS3yAqJE-kT42GLoLO03HF5sGSfS6YhZUXtL3kuifkV5B2gR26bKhwnDRvWRRaiF0OOW6qePe4-HQO-FXw1yN-sSIx9Q00rUC8s7hUEzC3oSWRgt_Xs_-5LkkANSfoJw/w640-h480/IMG_3980.jpg" width="640" /></a></div>Then it was time to bolt in the re-painted hinge part:<br /><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgR00-O0osm9SjyoNp6f5cfC7XEApsLzi6YkyAN4TNaReWEBVGtPeMeZ8mwexKjhK6YZO_tlskkwNH2RWR2JpJmBwtQwMV9W4R9Sx_NduBNoqcXKjb25jXQ5aKrdEDJHq82nm-LVIzIJUq0fhFd5STlmYfaeoPtDI70aZknttbCG12ZJY6fwXdDklKyins/s1200/IMG_3984.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgR00-O0osm9SjyoNp6f5cfC7XEApsLzi6YkyAN4TNaReWEBVGtPeMeZ8mwexKjhK6YZO_tlskkwNH2RWR2JpJmBwtQwMV9W4R9Sx_NduBNoqcXKjb25jXQ5aKrdEDJHq82nm-LVIzIJUq0fhFd5STlmYfaeoPtDI70aZknttbCG12ZJY6fwXdDklKyins/w640-h480/IMG_3984.jpg" width="640" /></a></div><div>This shows the new hood after glueing the aluminum trim into place:</div><div class="separator" style="clear: both; text-align: left;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFzkMjLpNnztdsDfl8QkHekXkAC16hZRFrgHv_fxE57nHkDBCsqfFZhLxYinALH974a-b3sQr-76nWMX-GscwH2M4mW_G8FlzGiFwZ3yure9RGvWblxLm3SnNxmutjxkB_3UVqe7w-Yxma6ZT-vCw7BI2kk0ocxh0BfOIsjr_SGDWxXYB5D3mWKR11Lo4/s1200/IMG_4015.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhFzkMjLpNnztdsDfl8QkHekXkAC16hZRFrgHv_fxE57nHkDBCsqfFZhLxYinALH974a-b3sQr-76nWMX-GscwH2M4mW_G8FlzGiFwZ3yure9RGvWblxLm3SnNxmutjxkB_3UVqe7w-Yxma6ZT-vCw7BI2kk0ocxh0BfOIsjr_SGDWxXYB5D3mWKR11Lo4/w640-h480/IMG_4015.jpg" width="640" /></a></div>I will now play this Beogram 4000 for bit longer to make sure there are no intermittent issues, and then it will be time to send it back to its owner!</div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-73660038805565827812024-01-16T22:57:00.001-05:002024-02-15T23:02:31.916-05:00Beogram 4000: A New Arrival from Massachusetts<p style="text-align: justify;">It is always a happy moment when a customer comes back for more! In this case I <a href="https://beolover.blogspot.com/2022/12/beogram-4000-complete-restoration.html" target="_blank">restored a Beogram 4000</a> for a client in Massachusetts in early 2023, and now I received a second 4000 from him. I guess one cannot have too many Beograms!...;-).</p><p style="text-align: justify;">This Beogram 4000 arrived safely packaged in a Beolover box. It also came with an exciting present for the Beolover!! (Thank you very much!):</p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiESJPUuuiyxFOIxinu1PIVaYL9QFnCFnVTTi4pk9BRPmtZU0Uu3fm7gM9V6rNcXtEf3WDqHJ-t-0mSuHgcgA8hpXJZkbCBViUeoSLz0J38HUKow-wXVpPBFR85-ZgUcvG-tz-1-aWp6i1_g2hIab48XAnV2xJ_jMSKG_2SpC90J189_D2Dlvs4VFuVkl4/s1200/1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiESJPUuuiyxFOIxinu1PIVaYL9QFnCFnVTTi4pk9BRPmtZU0Uu3fm7gM9V6rNcXtEf3WDqHJ-t-0mSuHgcgA8hpXJZkbCBViUeoSLz0J38HUKow-wXVpPBFR85-ZgUcvG-tz-1-aWp6i1_g2hIab48XAnV2xJ_jMSKG_2SpC90J189_D2Dlvs4VFuVkl4/w640-h480/1.jpg" width="640" /></a></div><div style="text-align: justify;">This lovely <a href="https://www.discogs.com/release/27345327-Bill-Evans-Trio-Waltz-For-Debby-" target="_blank">180g re-issue</a> of one of the greatest Jazz records of all time, Bill Evans Trio: "Waltz for Debby", which was recorded live in 1961 at the Village Vanguard, will be perfect for celebrating the completed restoration of this Beogram 4000!</div><div style="text-align: justify;"><br /></div><div><div style="text-align: justify;">I inspected the cosmetic condition. The aluminum surfaces are in pretty good shape!:</div></div><div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgVhAj60THnXAu03uyQ5fbUu7FSQRbD6tGQagUgwgZJh45KrL10LsFRGdRgfZHESPNhJsfXWfiL-mMJ_9kwEEHBxu9FzcZvdSPQpIW-ihMLnZAOTUpyu-S2DMDMPFoyk9EzL20L4at3JINdkKFNWoa1AZkXDMim4M4u_zoR6VmnG8ah1WGQz3gK_DrN1us/s1200/3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgVhAj60THnXAu03uyQ5fbUu7FSQRbD6tGQagUgwgZJh45KrL10LsFRGdRgfZHESPNhJsfXWfiL-mMJ_9kwEEHBxu9FzcZvdSPQpIW-ihMLnZAOTUpyu-S2DMDMPFoyk9EzL20L4at3JINdkKFNWoa1AZkXDMim4M4u_zoR6VmnG8ah1WGQz3gK_DrN1us/w640-h480/3.jpg" width="640" /></a></div><div style="text-align: justify;">The plinth corners are also still pretty sharp and have only minor flaws:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYTcrizxGdw-38cw6DpMrXozpKt4AVYsSNXUtLgZQJwnSr5eLgrAocjkCRGchxVoCfcz7R1dZgS0X_EA-vA2xvJ5ILjpiSspH5rj-zv2gblDwUWB1dHlfpvzxYXdZeRHCE33A1swjw3m-3R3c6l7Xv42EAJLoo7xMeP0eDF9MsmfEqRJWeXahmVLEzsXM/s1200/4.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYTcrizxGdw-38cw6DpMrXozpKt4AVYsSNXUtLgZQJwnSr5eLgrAocjkCRGchxVoCfcz7R1dZgS0X_EA-vA2xvJ5ILjpiSspH5rj-zv2gblDwUWB1dHlfpvzxYXdZeRHCE33A1swjw3m-3R3c6l7Xv42EAJLoo7xMeP0eDF9MsmfEqRJWeXahmVLEzsXM/w640-h480/4.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwOyoMLQGLMqGBQs0MWn58nmzzEx4XVZlCflaRu-NS4_YrgP0YP0dRcKjo7S2I5OhVOZcuxXsOoeIiG65EkblPA9Xrhv0ZgZ-53cGkOcOFHbos39uw-9p5Q9DfiGtVW_Wv8MfdmQXc9iUG0sMnTn92tNwnkEs2VCbH-08HZg2tsy2x72tDFtI08v-l83U/s1200/5.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjwOyoMLQGLMqGBQs0MWn58nmzzEx4XVZlCflaRu-NS4_YrgP0YP0dRcKjo7S2I5OhVOZcuxXsOoeIiG65EkblPA9Xrhv0ZgZ-53cGkOcOFHbos39uw-9p5Q9DfiGtVW_Wv8MfdmQXc9iUG0sMnTn92tNwnkEs2VCbH-08HZg2tsy2x72tDFtI08v-l83U/w640-h480/5.jpg" width="640" /></a></div><div style="text-align: justify;">I removed the platter and the panels for a look 'below deck':</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjeAkhRZf55IngkdbbwvKhbmiaU-_Uiy__O-uQ8sLGSZadl3vQt9q-v5MCjUnzYjvURMGgVmiwf7pxeRt9Xxhhjh6pDj_uw0v0NICRTDeSnyG8WVV5oAcC7r8afxdGn1qRg6sXl-b5b8sDxP1u4vS5vhFRNHtEQri8VwNYwhX4LjEc6ZbSYtrCohEVRLM/s1200/6.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjeAkhRZf55IngkdbbwvKhbmiaU-_Uiy__O-uQ8sLGSZadl3vQt9q-v5MCjUnzYjvURMGgVmiwf7pxeRt9Xxhhjh6pDj_uw0v0NICRTDeSnyG8WVV5oAcC7r8afxdGn1qRg6sXl-b5b8sDxP1u4vS5vhFRNHtEQri8VwNYwhX4LjEc6ZbSYtrCohEVRLM/w640-h480/6.jpg" width="640" /></a></div><div style="text-align: justify;">The unit seems in pretty much original condition. The usual stress-fracture is developing in the carriage pulley:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZouQbIYeA58ppldZg6ccKXSMcy9JQ1vhN0iyf_RXRu1eL39iT25Iy-T82m5UyJvlqR_2yLUXkwEC6CpYGCZo7dpAT08-Ma4YpSBLvrNsokq2JIEaAfr1zVWTQpF9ag3vmI__8G3i_aUr9xYAuhubXZpmYKs4uZylaoSRNSxS-CmWswnlDPvl2mKdsJFc/s1200/7.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZouQbIYeA58ppldZg6ccKXSMcy9JQ1vhN0iyf_RXRu1eL39iT25Iy-T82m5UyJvlqR_2yLUXkwEC6CpYGCZo7dpAT08-Ma4YpSBLvrNsokq2JIEaAfr1zVWTQpF9ag3vmI__8G3i_aUr9xYAuhubXZpmYKs4uZylaoSRNSxS-CmWswnlDPvl2mKdsJFc/w640-h480/7.jpg" width="640" /></a></div><div style="text-align: justify;">Happily, the red position indicator is still intact:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXIkCr0vOmNvIo-3qQgjND7N4VaX3IeZKZ4abfSO4ItYYkrvcY9PMlc0i6RmA4NaLQU-UMS-TY8gU5oE4GhRczKie6Klj8cIb2i719NoTJeYhvUFjeDTNqLzr9pEmgvuEX7tMc5MWAbNA3NiDnmp2Ej7P49h2sOL8d-Av0irX5o9bE38nmtoHADDPFCq4/s1200/8.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXIkCr0vOmNvIo-3qQgjND7N4VaX3IeZKZ4abfSO4ItYYkrvcY9PMlc0i6RmA4NaLQU-UMS-TY8gU5oE4GhRczKie6Klj8cIb2i719NoTJeYhvUFjeDTNqLzr9pEmgvuEX7tMc5MWAbNA3NiDnmp2Ej7P49h2sOL8d-Av0irX5o9bE38nmtoHADDPFCq4/w640-h480/8.jpg" width="640" /></a></div><div style="text-align: justify;">I plugged it in and pressed start: The strobe light for the RPM adjustment came alive with a health orange glow:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEissXgoGEqSVktT1jCTHkKbrl9ymlo2XQ-yUnYidvsoF0t8D7hNd66xxmrbCO3ybEn2k5WRqO-8BfNwmNr_6viwR2x-qWY8ex-KeTwcxN-p4sWO-8yi_WbuAw1gIAJRbvrV67ayZgAo1XJDyN1N82VONgo-JtQP0AR_6am01Tq4Eu_OwfcY8tfFDBFuF98/s1200/9.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEissXgoGEqSVktT1jCTHkKbrl9ymlo2XQ-yUnYidvsoF0t8D7hNd66xxmrbCO3ybEn2k5WRqO-8BfNwmNr_6viwR2x-qWY8ex-KeTwcxN-p4sWO-8yi_WbuAw1gIAJRbvrV67ayZgAo1XJDyN1N82VONgo-JtQP0AR_6am01Tq4Eu_OwfcY8tfFDBFuF98/w640-h480/9.jpg" width="640" /></a></div><div style="text-align: justify;">Beautiful! The deck also found the LP setdown point and the solenoid activated. All good signs!</div></div><div><div style="text-align: justify;">This should be a straight forward restoration. Stay tuned!</div><p style="text-align: justify;"><br /></p><p style="text-align: justify;"><br /></p><p><br /></p></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-32003653059721238802024-01-11T02:25:00.004-05:002024-01-11T02:39:27.226-05:00Redesign of the BeoloverRPM Device: Precisely Measure and Log the Platter RPM<p style="text-align: justify;">I recently decided to redesign my BeoloverRPM device, which I <a href="https://beolover.blogspot.com/2015/12/beoloverrpm-shop-version.html" target="_blank">started developing in 2015</a> for the detection of intermittent RPM variations mainly of DC platter motors. I thought after ~8 years it could use a little update in terms of ergonomics and performance. The original device was based on an Atmega 328P processor (aka 'Arduino') and this limited the performance a bit. I recently got into using the much more advanced ESP32 platform. This enabled a few new tricks due to the much higher speed.</p><p style="text-align: justify;">The new BeoloverRPM can be placed on the aluminum panels for a quick and convenient RPM check</p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAuAPcYaDS9MqhMl4OrOHA5_i3bzO8k_1f1DM9MlZOlFdn9QA9inFksYS5VdG0EfgD797jXUPo2WPIALD6wmfIEdWCUbrkVYpuJfpzIEreOugdEM9zqZUvJDeJik_LwxJco6EifScUKdvkN8sciXCmTefDZ9nE4PQQUIsP9YuZO1StRwmj7DwhD8enIus/s1200/IMG_2234.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="673" data-original-width="1200" height="358" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAuAPcYaDS9MqhMl4OrOHA5_i3bzO8k_1f1DM9MlZOlFdn9QA9inFksYS5VdG0EfgD797jXUPo2WPIALD6wmfIEdWCUbrkVYpuJfpzIEreOugdEM9zqZUvJDeJik_LwxJco6EifScUKdvkN8sciXCmTefDZ9nE4PQQUIsP9YuZO1StRwmj7DwhD8enIus/w640-h358/IMG_2234.jpg" width="640" /></a></div><div style="text-align: justify;">but it can also be configured for frame mounting when working on a Beogram:</div><div style="text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghzxJZQ5L4IVg7FzFN7je94d5UYoCqaVwOQYostqyNMNvtf2iXGPJhmSCD8NpUW7Oa4WVwEAmxyNzRQlUAWaI79QEYQtn7M2OkQkC-rrBhvc_ZbY_IlFPq-P9CHXXRMYQOO3sU5ARtmp13hi3xLbKc5zUCAoWyqsESuNrcx6b3xpO_c4_Ys0HoW-gT1Ag/s1200/Screenshot%202024-01-10%20at%2011.24.57%20PM.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="671" data-original-width="1200" height="358" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghzxJZQ5L4IVg7FzFN7je94d5UYoCqaVwOQYostqyNMNvtf2iXGPJhmSCD8NpUW7Oa4WVwEAmxyNzRQlUAWaI79QEYQtn7M2OkQkC-rrBhvc_ZbY_IlFPq-P9CHXXRMYQOO3sU5ARtmp13hi3xLbKc5zUCAoWyqsESuNrcx6b3xpO_c4_Ys0HoW-gT1Ag/w640-h358/Screenshot%202024-01-10%20at%2011.24.57%20PM.jpg" width="640" /></a></div><div style="text-align: justify;">This was achieved by a design where the frame adapters can be removed from the main device:</div><div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCe-HY0uLvJyabnu9HceK_ohTyvz0dxBTrOJ7yYIQxOejix29LUoRy8zUZwnHy9nChKZAYqBcbOy_NIOAUXRdJ8v8vNuEALvOSwcyHtddmuRK7frh7Kn22LzB3E9wgyV_-gKhdysFvMu8KnQGGhSPmfE_dhW7oxwE1Z8i8g99RrIhhveGvZ25oeVtDETE/s1200/Screenshot%202024-01-10%20at%2011.31.22%20PM.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="674" data-original-width="1200" height="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCe-HY0uLvJyabnu9HceK_ohTyvz0dxBTrOJ7yYIQxOejix29LUoRy8zUZwnHy9nChKZAYqBcbOy_NIOAUXRdJ8v8vNuEALvOSwcyHtddmuRK7frh7Kn22LzB3E9wgyV_-gKhdysFvMu8KnQGGhSPmfE_dhW7oxwE1Z8i8g99RrIhhveGvZ25oeVtDETE/w640-h360/Screenshot%202024-01-10%20at%2011.31.22%20PM.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">The BeoloverRPM comes with two frame adapters that have different spacing between the 'legs' that straddle the enclosure wall. B&O used slightly different enclosure designs with varying wall thickness.</div><div class="separator" style="clear: both; text-align: justify;"><br /></div><div class="separator" style="clear: both; text-align: justify;">Another significant update is that the BeoloverRPM now has two data acquisition modes:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh6JENIW4ukTm16l17v8WTrjx1c4ddhAF2ByRi1xd3muQpFbyudNkj_TTLCf5pd8Ark9l1LQzIxwVwZGtTTICOVKKt_lAVj5u7jA1NHbWTIXVmJNrRZjEDYWeD0kxmNvLlhi5w5GW3ZIKzof8WkUnkVcuntOEzkNT79QJTSw104MEG17nlNFkZ2mwHsu0s/s1444/Screenshot%202024-01-10%20at%2011.31.08%20PM.png" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="813" data-original-width="1444" height="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh6JENIW4ukTm16l17v8WTrjx1c4ddhAF2ByRi1xd3muQpFbyudNkj_TTLCf5pd8Ark9l1LQzIxwVwZGtTTICOVKKt_lAVj5u7jA1NHbWTIXVmJNrRZjEDYWeD0kxmNvLlhi5w5GW3ZIKzof8WkUnkVcuntOEzkNT79QJTSw104MEG17nlNFkZ2mwHsu0s/w640-h360/Screenshot%202024-01-10%20at%2011.31.08%20PM.png" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">The modes can be selected via buttons on the device. The 'slow' mode performs similar to the previous designs. It shows the RPM and min/max values on the display, and sends a RPM snapshot to the serial port every 10s (faster if the RPM changes quickly).</div><div class="separator" style="clear: both; text-align: justify;">The 'fast' mode is new: It graphs all datapoints as they come in whenever a rib passes under the sensor. The display shows a rolling snapshot of the last 64 datapoints. The data is also sent out via the serial port. Here is an example measured on a Beogram 4004:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh00E3LVG-zMxAdfKNUmbb2QrSUR2a8wcKmzppuK2DjIGAGtjpyi4cgRFLkLBIlqh56crQjbBJGoybUAkmG4wKrTdN1QXolroJS_mjkMRGqD2nhruS1oEdbPt6xpsFvLJ0UBcm8xnWQnkFE_X8W_T59ffnDGX-zTHK1zgfgDABMlC9TAdnwDAhiBP51lRA/s874/Screenshot%202024-01-10%20at%2011.30.02%20PM.png" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="656" data-original-width="874" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh00E3LVG-zMxAdfKNUmbb2QrSUR2a8wcKmzppuK2DjIGAGtjpyi4cgRFLkLBIlqh56crQjbBJGoybUAkmG4wKrTdN1QXolroJS_mjkMRGqD2nhruS1oEdbPt6xpsFvLJ0UBcm8xnWQnkFE_X8W_T59ffnDGX-zTHK1zgfgDABMlC9TAdnwDAhiBP51lRA/w640-h480/Screenshot%202024-01-10%20at%2011.30.02%20PM.png" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">The main graph shows the data output from about 60 platter rotations. The graph shows a repeating pattern modulated by a sinusoidal envelope. Closer inspection yielded that the pattern repeats every 24 points, i.e. everytime the platter makes a full turn (there are 24 ribs on the platter). This can be explained by minute changes of the rib spacing (it varies by about 0.1%).</div><div class="separator" style="clear: both; text-align: justify;">The sinusoidal modulation is a result of the feedback based RPM control of the DC platter motors of the later Beogram 4002 and 4004. Feedback control always results in an oscillation of the actual value around the set point. And that is what we see here. The analog feedback mechanism used by the later Beograms is based on time constants defined by capacitors and resistors, and this results in sinusoidal RPM variations.</div><div class="separator" style="clear: both; text-align: justify;">Fascinating stuff!...;-).</div><div class="separator" style="clear: both; text-align: justify;"><br /></div><div class="separator" style="clear: both; text-align: justify;">I made a short video about the new BeoloverRPM. Enjoy!</div><div class="separator" style="clear: both; text-align: justify;"><br /></div></div><div style="text-align: justify;"><iframe allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/57MptKzEfho?list=PLESEm7IGo1cByvOVx5XbHXXOm-DrLlCvV&rel=0" width="560"></iframe>
</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-72330567745073370872024-01-04T17:44:00.001-05:002024-01-04T17:45:03.345-05:00Beogram 4004 (5526): Installation of a New Hood and Aluminum Trim<p style="text-align: justify;">This post is a follow up to the main restoration summary of a Beogram 4004 that I recently posted <a href="https://beolover.blogspot.com/2023/12/beogram-4004-functional-restoration.html" target="_blank">here</a>. Due to a shipping mishap I had to wait for another hood to arrive from the Beoparts-store in Denmark. The first one came chipped:</p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgxpwKMQb6INvyhmnsT7sM3qQ_VRvEYD5mNfZdNK0fmncK-mxP4Pnm_C6HD22an_QeD70c0fX1W6F_KT6EtOegE_XmrTO8PiTBwAS6E9q1CwI3riD2xl31gI1Ln-X5AmTtnC6Mjp3SufU76XB7D_WrypvG6leAW62rh3YS_YUuSUecED2bEyWgGeh7UZYM/s1200/69.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgxpwKMQb6INvyhmnsT7sM3qQ_VRvEYD5mNfZdNK0fmncK-mxP4Pnm_C6HD22an_QeD70c0fX1W6F_KT6EtOegE_XmrTO8PiTBwAS6E9q1CwI3riD2xl31gI1Ln-X5AmTtnC6Mjp3SufU76XB7D_WrypvG6leAW62rh3YS_YUuSUecED2bEyWgGeh7UZYM/w640-h480/69.jpg" width="640" /></a></div><div style="text-align: justify;">Unfortunately, the Beoparts-store seems to enjoy saving on packaging, and so a minor whacking of the package on its way through automatic sorting machines or while being bounced around in speeding delivery vans can cause significant damage. This shows the damage to the carton at the location of the above chip:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhe-OOnlUX4FfLLBHm3Mh3lg7frfb0qAFZxMy02U7l_7IS2NOrN1nxg_HSzC6GsLJfdguQdJPMuuTGUQnrXvs6XYf2jlFsyqTvEyycwrgr_iRVHky2JFVs1ACeEcxovrNLWH-eEoP8MdGAFCUc6Yj0kH73W2MFPEdMoj6u03yQuq1TT5ipFJJP0H8Ak7SY/s1200/71.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhe-OOnlUX4FfLLBHm3Mh3lg7frfb0qAFZxMy02U7l_7IS2NOrN1nxg_HSzC6GsLJfdguQdJPMuuTGUQnrXvs6XYf2jlFsyqTvEyycwrgr_iRVHky2JFVs1ACeEcxovrNLWH-eEoP8MdGAFCUc6Yj0kH73W2MFPEdMoj6u03yQuq1TT5ipFJJP0H8Ak7SY/w640-h480/71.jpg" width="640" /></a></div><div style="text-align: justify;">These fairly delicate hoods come in a single cardboard wrapper </div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgj-xLjdQkBl-uzG6Gm5D0x8Sd21pMaTPd-Fn4FH60btOyeHNOQFAqrlld46jnjWSnaRhjs48sI0EEXi8wGMm81g78kWrtTylV1FKlVCs3YBTnc10coLbvylBwvf5OGPVCe-aGBu6EwtYxyjjsmTM3EB2XbmCe9HWEJkybgNORP3PObeDJ-osOx_-egrho/s1200/70.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgj-xLjdQkBl-uzG6Gm5D0x8Sd21pMaTPd-Fn4FH60btOyeHNOQFAqrlld46jnjWSnaRhjs48sI0EEXi8wGMm81g78kWrtTylV1FKlVCs3YBTnc10coLbvylBwvf5OGPVCe-aGBu6EwtYxyjjsmTM3EB2XbmCe9HWEJkybgNORP3PObeDJ-osOx_-egrho/w640-h480/70.jpg" width="640" /></a></div><div style="text-align: justify;">with barely enough space on the inside for a double bubblewrap layer around the hood.</div><div style="text-align: justify;">Definitely not enough cushioning. Luckily, the Beoparts-store does not make a fuss about such damages and they replace for free. Though I really wonder if this is very efficient compared to double boxing them outright. Charge a few $$ more for the additional packaging and save everybody some time?</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Anyway, the replacement recently made it in good shape, and so I set out to repaint the corroded hinge. This happens fairly often with Beogram hood hinges. Two pictures of the damage:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVaIWmyudhQqDrCgUUbPFDRmSj_3DmQ8YfaWPjbC9ag4uF6HMBO6YrGFNe1RKNSxiNAcd7OVSLsfkR5muxpcramCrwBCKNovExVcIoQeC_5Ht2QBhQeGtBO4KhCt16Qk62pJZfdVYTjpEgxGXX41v3iT41s1xY800h4GbhR_lR5-PmKNZQBOIzQfPjewg/s1200/65.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVaIWmyudhQqDrCgUUbPFDRmSj_3DmQ8YfaWPjbC9ag4uF6HMBO6YrGFNe1RKNSxiNAcd7OVSLsfkR5muxpcramCrwBCKNovExVcIoQeC_5Ht2QBhQeGtBO4KhCt16Qk62pJZfdVYTjpEgxGXX41v3iT41s1xY800h4GbhR_lR5-PmKNZQBOIzQfPjewg/w640-h480/65.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6IwtoixxzmFUnQcAVWNYEdL7LSMRB80putdnWkzqfWBb40Nge8MwJLxhBKq2IL_qHmh4RiPs3LmZs21IsVKE1U1ACX4JGizFQS0LxQkj84c9n5lO8cPuCEBsJ-c-TaOEV8X2iFf-qRGUHlOQJ2MNTJy-w2fBIBwrEdsBlnTGkiOZVeYsy8IW-hI6Y2Xk/s1200/66.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6IwtoixxzmFUnQcAVWNYEdL7LSMRB80putdnWkzqfWBb40Nge8MwJLxhBKq2IL_qHmh4RiPs3LmZs21IsVKE1U1ACX4JGizFQS0LxQkj84c9n5lO8cPuCEBsJ-c-TaOEV8X2iFf-qRGUHlOQJ2MNTJy-w2fBIBwrEdsBlnTGkiOZVeYsy8IW-hI6Y2Xk/w640-h480/66.jpg" width="640" /></a></div><div style="text-align: justify;">I took the hinge assembly apart to get the main part ready for spray painting:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgoudJdbLFqW27Md-JxTPC8RZD4reBF5LGDUSCJ1GnxBGHcUcDetquGvipCfhJxYW1KCHOtjdF0OZ9Zt5uImFWtdKrF3e7V4rfQnXZgj4fnWuOJaKNEM8WLl9NPSDm5OAnmFuDuOyRJ-AcWQp-7NeIDwvSjWgDPm45p4589qIBb7iYvzUIl3xQ3ujgxBbw/s1200/67.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgoudJdbLFqW27Md-JxTPC8RZD4reBF5LGDUSCJ1GnxBGHcUcDetquGvipCfhJxYW1KCHOtjdF0OZ9Zt5uImFWtdKrF3e7V4rfQnXZgj4fnWuOJaKNEM8WLl9NPSDm5OAnmFuDuOyRJ-AcWQp-7NeIDwvSjWgDPm45p4589qIBb7iYvzUIl3xQ3ujgxBbw/w640-h480/67.jpg" width="640" /></a></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">Normally, pretty decent results can be achieved by sanding the corroded areas with an orbital sander followed by spray painting with a satin enamel. This is the result of my efforts:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWEhirYNbqeQtSOcML2q77pQLJH2yMTaZEZQJOmcIt-xysUKpEDsm3y73TT6WppP4yaV04aFqoDLVVRXBRe3HJtP1mKrGv-ypFMfm-RzCdiakPIZIdni5d1S4gs2aD9_T_nit5PoKT0-BzyryZVYV1seBsuZ2SWTz16awHwaMRyoaJOE67C8DJjyhH-dg/s1200/68.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="675" data-original-width="1200" height="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWEhirYNbqeQtSOcML2q77pQLJH2yMTaZEZQJOmcIt-xysUKpEDsm3y73TT6WppP4yaV04aFqoDLVVRXBRe3HJtP1mKrGv-ypFMfm-RzCdiakPIZIdni5d1S4gs2aD9_T_nit5PoKT0-BzyryZVYV1seBsuZ2SWTz16awHwaMRyoaJOE67C8DJjyhH-dg/w640-h360/68.jpg" width="640" /></a></div><div style="text-align: justify;">Not perfect, but definitely much nicer than the corrosion!</div><div><div style="text-align: justify;">This shows the hood replacement and the reproduction aluminum strip:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCjja07EpPlAKc3YuxBU414HbUuW663_bggn47dW8IQcuupTCBYjl9W1QeFyFCk6X9igo3eMwqQmpy51dqjjx8gJh74wfJwTHV4ZJNzHb70edCWrDNHhllxE79vAALMge8rL7Hx_EtwEsVRJf8rwDWABgmkR5fIMXY0ic1ertLMwgF1u4UbkxgAd0YqsM/s1200/72.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCjja07EpPlAKc3YuxBU414HbUuW663_bggn47dW8IQcuupTCBYjl9W1QeFyFCk6X9igo3eMwqQmpy51dqjjx8gJh74wfJwTHV4ZJNzHb70edCWrDNHhllxE79vAALMge8rL7Hx_EtwEsVRJf8rwDWABgmkR5fIMXY0ic1ertLMwgF1u4UbkxgAd0YqsM/w640-h480/72.jpg" width="640" /></a></div><div style="text-align: justify;">And here after everything was put together:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhOzTnLLTlgvxh13raq03H3cDx5LPuI1TWw32YYJ3dU0B1BgYFSPMsNWXhljImpUi48dkTJa6C_ytWk84KFLTfThAPfqAcrlCxXvAK2TxS66vl4D0Db2bSDNFG1_kUvEqBijr9_IuFGNlAnYiKV9iG2x0ZElAwNp2Asb118Xd7OKZ3MHIkJET5fieKAPqs/s1200/73.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhOzTnLLTlgvxh13raq03H3cDx5LPuI1TWw32YYJ3dU0B1BgYFSPMsNWXhljImpUi48dkTJa6C_ytWk84KFLTfThAPfqAcrlCxXvAK2TxS66vl4D0Db2bSDNFG1_kUvEqBijr9_IuFGNlAnYiKV9iG2x0ZElAwNp2Asb118Xd7OKZ3MHIkJET5fieKAPqs/w640-h480/73.jpg" width="640" /></a></div><div style="text-align: justify;">This concludes the restoration of this Beogram 4004, and it will soon be time to send it on to its owner.</div><div><div style="text-align: justify;"><br /></div><p><br /></p></div></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-5398973404357621292023-12-31T13:16:00.004-05:002023-12-31T13:17:15.718-05:00Beogram 4002 (5513): Complete Functional Restoration and Installation of a Beolover Commander Remote Control<p style="text-align: justify;">This post describes the complete functional restoration of a Beogram 4002 (5513) that I recently received from a customer in Tennessee. The post about my initial evaluation of this unit can be found <a href="https://beolover.blogspot.com/2023/12/beogram-4002-assessment-of-conditon.html" target="_blank">here</a>.</p><p style="text-align: justify;">This shows the unit in 'service position' with the platter and aluminum panels removed:</p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5L3ddWrY6zAmz80l6fHeKz58Fws1FgUezjncpgitCevOcsQ8NQl6TX9RnHXWzHNrLATy_XXT197AoQ7-gSRSLx0LF_i1g-v4rkPAdRoa8bU7Z_0z00qYdEtDucJeNF5w4RRgUX2TH8-OG8dQ5xTpiYlVYNPGthyphenhyphen2uuSZXXQM4VI0F-BM0mXptoollOCg/s1200/0.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5L3ddWrY6zAmz80l6fHeKz58Fws1FgUezjncpgitCevOcsQ8NQl6TX9RnHXWzHNrLATy_XXT197AoQ7-gSRSLx0LF_i1g-v4rkPAdRoa8bU7Z_0z00qYdEtDucJeNF5w4RRgUX2TH8-OG8dQ5xTpiYlVYNPGthyphenhyphen2uuSZXXQM4VI0F-BM0mXptoollOCg/w640-h480/0.jpg" width="640" /></a></div><div style="text-align: justify;">Pretty much all DC-motor Beogram 4002s need the bearings in their platter motors re-infused with oil. Over time the oil stored in the bearings gets depleted while playing records. This causes dry bearings and many Beograms end up with RPM stability issues. The oil infusion usually takes a few days and so I usually start with extracting the bearings from the DC platter motor. This shows the extracted motor: </div><div style="text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhW_xR6msz8Lft2L_MMGiYV3lhyiL9Zic7YFh0xyfY_5_nvz3yhNV65S2aaqvi4OaPgexVC7MLB39cRr9FUWiwX5ED1hDUPfA5YEdmkgoAGBtvkXYB2Iy47t1RAEWJGm0Jo5gpz3NkNRXLiWbVZjBiI-3ROrkpF_Z0AFtv-SZUFfmhdRE1ohF9F3dMoW9E/s1200/1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhW_xR6msz8Lft2L_MMGiYV3lhyiL9Zic7YFh0xyfY_5_nvz3yhNV65S2aaqvi4OaPgexVC7MLB39cRr9FUWiwX5ED1hDUPfA5YEdmkgoAGBtvkXYB2Iy47t1RAEWJGm0Jo5gpz3NkNRXLiWbVZjBiI-3ROrkpF_Z0AFtv-SZUFfmhdRE1ohF9F3dMoW9E/w640-h480/1.jpg" width="640" /></a></div><div style="text-align: justify;">I disassembled it to get the bearings out. They are the two small donuts on the black pad up front:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWnpPEP1LRW7Csf3B0Hja1wU-BOoyb6RnApstd6GF0ZI0ewlQVuSbNZLX-R5gYgugjm1XromvCqBfklCO2jSVFdtY3lvuIEtmnIUR331ihVY_w111m4Qsf62bMHu6uusJQ2SxeZWE9uQOBgILRwcwVvhjIdJBynIOUMuSYgjqIt1vF907VhJ0RCDeXBhc/s1200/2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWnpPEP1LRW7Csf3B0Hja1wU-BOoyb6RnApstd6GF0ZI0ewlQVuSbNZLX-R5gYgugjm1XromvCqBfklCO2jSVFdtY3lvuIEtmnIUR331ihVY_w111m4Qsf62bMHu6uusJQ2SxeZWE9uQOBgILRwcwVvhjIdJBynIOUMuSYgjqIt1vF907VhJ0RCDeXBhc/w640-h480/2.jpg" width="640" /></a></div><div style="text-align: justify;">I immersed them in motor oil and pulled a vacuum. Immediately, vigorous bubbling started:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7RY1jF2avuJzZr3kI20EXfIgTD356WTNeZE9IPMduSUPfkk_KTzJzM09JEB80AN9n1-vnzl5UBpPMPCSB5WZESGQhRTDh4uxveIVwu0TTPaXsubMD5hHqfkakClqz0kSut1VObVp7vFmcGK25YXHO0U3PtSqpF2BazyBiNYLIGAN1gE-O4OwGkGgQDFw/s1200/3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7RY1jF2avuJzZr3kI20EXfIgTD356WTNeZE9IPMduSUPfkk_KTzJzM09JEB80AN9n1-vnzl5UBpPMPCSB5WZESGQhRTDh4uxveIVwu0TTPaXsubMD5hHqfkakClqz0kSut1VObVp7vFmcGK25YXHO0U3PtSqpF2BazyBiNYLIGAN1gE-O4OwGkGgQDFw/w640-h480/3.jpg" width="640" /></a></div><div style="text-align: justify;">The bubbling represents air drawn from the empty pores of the Oilite bearing material. This makes room for oil to diffuse into the bearing. The process is complete when the bubbling stops. This usually happens after 2-3 days.</div><div><div style="text-align: justify;">While this process went on, I focused on the remaining restoration tasks. As usual, I restored the carriage first. The carriage harbors the arm lowering mechanism, which is often motion-impaired due to hardened lubricants. This shows the relevant sections comprised of solenoid and damper plus connecting linkages and springs:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWvAmgWH2Njj7K5y9gu0Eyjl79-X99rUgDBfsg4vmKyMraXOjnoTng75q0b06w1CvzMO6XW0THoET2WWsUSc7Ye76jh6_jYdyd5fs1MifIp2I2q5VhhlsQv88R4qcbNlfbk0vqfjbFxK49Nkn6fiEQGzdNFns0abAyo0dcMu35H1nn1meUW7IvWnLPyqg/s1200/4.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWvAmgWH2Njj7K5y9gu0Eyjl79-X99rUgDBfsg4vmKyMraXOjnoTng75q0b06w1CvzMO6XW0THoET2WWsUSc7Ye76jh6_jYdyd5fs1MifIp2I2q5VhhlsQv88R4qcbNlfbk0vqfjbFxK49Nkn6fiEQGzdNFns0abAyo0dcMu35H1nn1meUW7IvWnLPyqg/w640-h480/4.jpg" width="640" /></a></div><div style="text-align: justify;">I removed all the essential parts, </div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg_uvOg3HbmGo9WbNLX7w5UGOxaXAeRJRmzKmcg5SQJEbsWpH_i8MRE7OD1WJ3m7xxiFIhv9RjepNmCt1KcigYcahEHLX4q3Z981uT1PahSbp9SrX7qO8yZcI4Dle5fKmjDYmiO4vnOUipSIE153J9soR0an1lNH2VnL6nR39LvDRrGpP8WPn7A55jPR1g/s1200/5.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg_uvOg3HbmGo9WbNLX7w5UGOxaXAeRJRmzKmcg5SQJEbsWpH_i8MRE7OD1WJ3m7xxiFIhv9RjepNmCt1KcigYcahEHLX4q3Z981uT1PahSbp9SrX7qO8yZcI4Dle5fKmjDYmiO4vnOUipSIE153J9soR0an1lNH2VnL6nR39LvDRrGpP8WPn7A55jPR1g/w640-h480/5.jpg" width="640" /></a></div><div style="text-align: justify;">as well as the spindle that moves the carriage and the rods it travels on. This shows the removed parts ready for ultrasonic cleaning:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhD2sLDt5AjEghjwGUPcFHuN1b00fD-lLan35vp4I0TsFyxamhS-A8nZji6J1-5_EkF3DJvW08OqkBF_JC59_zKwEBRTv9f8hK3-yHuKkf7gi7Ez6AG00lmToGkD_R4tPQ9xDtmhi33vYDVnqpYetv5GS4HbiooyDPrataWkv47YTEBPJDoCrVGK_0Czno/s1200/6.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhD2sLDt5AjEghjwGUPcFHuN1b00fD-lLan35vp4I0TsFyxamhS-A8nZji6J1-5_EkF3DJvW08OqkBF_JC59_zKwEBRTv9f8hK3-yHuKkf7gi7Ez6AG00lmToGkD_R4tPQ9xDtmhi33vYDVnqpYetv5GS4HbiooyDPrataWkv47YTEBPJDoCrVGK_0Czno/w640-h480/6.jpg" width="640" /></a></div><div style="text-align: justify;">I usually run the cleaner for 1-2 hours to get everything nice and lubricant-free:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjMsdTjjs_d-wBlGsJGX7TPKrJfE50RSYYfTjASEvlQj2KtPoxCDl60X7AFO46YXzDDq7DPPjer-pV4EHg2FHqj9vtGN_NJHjPL4dx0jid8Oz1cd6OlQ8JtEumhmjC3GPSqlq1qBTEYnva-wt40bJpqCLIaLk_TAi0ImeghMnSaSu5o4CUCxLlcKCn7HMg/s1200/7.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjMsdTjjs_d-wBlGsJGX7TPKrJfE50RSYYfTjASEvlQj2KtPoxCDl60X7AFO46YXzDDq7DPPjer-pV4EHg2FHqj9vtGN_NJHjPL4dx0jid8Oz1cd6OlQ8JtEumhmjC3GPSqlq1qBTEYnva-wt40bJpqCLIaLk_TAi0ImeghMnSaSu5o4CUCxLlcKCn7HMg/w640-h480/7.jpg" width="640" /></a></div><div style="text-align: justify;">Then it was time to reassemble everything. First, I put a new gasket into the damper:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQGRhciMwSBcpeomveyaj_kog-XvNAj0OBDQXCVa9BNnyXlMMkE7kV7qnp5p2MOflqCZ9J2qYX4LZH52E0KzrZ6tSQcswp89BgCvovzo-z5gdBHpbAfM7fgwfyyjNo1DVUHW2-6zFBHg1-OycJbdpjUSzmidmVeyIo4NhFEzROf7Np47hP6Bl53_cxdKM/s1200/8.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQGRhciMwSBcpeomveyaj_kog-XvNAj0OBDQXCVa9BNnyXlMMkE7kV7qnp5p2MOflqCZ9J2qYX4LZH52E0KzrZ6tSQcswp89BgCvovzo-z5gdBHpbAfM7fgwfyyjNo1DVUHW2-6zFBHg1-OycJbdpjUSzmidmVeyIo4NhFEzROf7Np47hP6Bl53_cxdKM/w640-h480/8.jpg" width="640" /></a></div><div style="text-align: justify;">This is an essential step in the restoration since it ensures a reliable and consistent arm lowering experience. The original rubber rings are often hardened and this cause problems when they seat against the plunger. This can cause sudden arm drops instead of a controlled smooth lowering.</div></div><div><div style="text-align: justify;">This shows the reassembled mechanism:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEis05Vlr2FkahHEjVz8Sfu7GLDW9R4UOe-rdp8U6-8toAl7UXyvxohkOvkjqhfCcSODmp8Vz0VEcUmc5hBJhYt9rhAs62ZGIBS70CPfvat4OAGmvcLKh-N6qUl0GG-5MehS3biFsTBJ6_d9i_wXyz67OmvDwoi3UYBZ8koDltrlI171mQVZ4eDhOHwVk0Y/s1200/9.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEis05Vlr2FkahHEjVz8Sfu7GLDW9R4UOe-rdp8U6-8toAl7UXyvxohkOvkjqhfCcSODmp8Vz0VEcUmc5hBJhYt9rhAs62ZGIBS70CPfvat4OAGmvcLKh-N6qUl0GG-5MehS3biFsTBJ6_d9i_wXyz67OmvDwoi3UYBZ8koDltrlI171mQVZ4eDhOHwVk0Y/w640-h480/9.jpg" width="640" /></a></div><div style="text-align: justify;">I also replaced the already cracking carriage pulley</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEje21Unz6PiiEHwhfSwa3hIg-DfL3Hjh4ctd98yEUIyKIqKjiZVt098OBBsY3xI8_NR_Xs3BQFjhY-aJMN7JQd1F8vtOXGI1IDhotPCtnXZms2vot6x0jfWNirFc3NqoBOQ_mDzD8sZ8XaBXf9tbvMmVULDcW8H0DPzuF6wjOqGdZJGzetHI4kK-fLUZPM/s1200/10.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEje21Unz6PiiEHwhfSwa3hIg-DfL3Hjh4ctd98yEUIyKIqKjiZVt098OBBsY3xI8_NR_Xs3BQFjhY-aJMN7JQd1F8vtOXGI1IDhotPCtnXZms2vot6x0jfWNirFc3NqoBOQ_mDzD8sZ8XaBXf9tbvMmVULDcW8H0DPzuF6wjOqGdZJGzetHI4kK-fLUZPM/w640-h480/10.jpg" width="640" /></a></div><div style="text-align: justify;">with a precision machined aluminum replacement:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDbOQLn4jv5m4ysBXF6UbKR7Rsmfq7RtzYwEhI99pTQWoMAqaUrWjD-SdymKmSYoylFPh0Eue1zq7C4vdvmjf6zr8fRNs9ctyu1JqEpyCWVVqCW0_eP99jjVDzcJD8qnh99JPDqGa3r7v0sDC-RSchVDX-PxkJ9eEnLoybFzDNX1He_3ASY7tNdo-wRoU/s1200/11.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDbOQLn4jv5m4ysBXF6UbKR7Rsmfq7RtzYwEhI99pTQWoMAqaUrWjD-SdymKmSYoylFPh0Eue1zq7C4vdvmjf6zr8fRNs9ctyu1JqEpyCWVVqCW0_eP99jjVDzcJD8qnh99JPDqGa3r7v0sDC-RSchVDX-PxkJ9eEnLoybFzDNX1He_3ASY7tNdo-wRoU/w640-h480/11.jpg" width="640" /></a></div><div style="text-align: justify;">There is one more linkage in the arm lowering mechanism that needs attention: It connects the end of the damper with the actual arm assembly. This linkage pivots on a small shaft that is mounted on the sensor arm assembly.</div></div><div><div style="text-align: justify;">The linkage is located between the two arms and can be seen poking out from the back of the arms assemblies. It sticks out from the V cut on the part that is bolted to the back of the counter weight:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjFARzdiSUwyl-CnQZGiytMFvb413NqcVpIh1s2Hd7epwGzGEOAKegWPg5-Y_TyeK2sumQA3MasiiXoLvpkf8ulEc8kQfhuLEs7D_CU7KtsvTaP7O6RvQFEnspPit4rGR6mXGbanjmf_szoH9rSBZyvlSJDCojCtj5mOLPZBbErgxfqLoFUkCO5rF1DwuU/s1200/12.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjFARzdiSUwyl-CnQZGiytMFvb413NqcVpIh1s2Hd7epwGzGEOAKegWPg5-Y_TyeK2sumQA3MasiiXoLvpkf8ulEc8kQfhuLEs7D_CU7KtsvTaP7O6RvQFEnspPit4rGR6mXGbanjmf_szoH9rSBZyvlSJDCojCtj5mOLPZBbErgxfqLoFUkCO5rF1DwuU/w640-h480/12.jpg" width="640" /></a></div><div style="text-align: justify;">For the re-lubrication of this pivot point the sensor arm needs to be removed. This shows it with the linkage already removed (watch out for the small spring that is under the retaining clip if you try this at home):</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgctiRfVVJ85dmQmW8IJCfCAmWBeaLrBFe9a_2netqx6rxPgAyWxcya9wmw84Gj2d9Xxzqwl2ulkJ83XIbhQbX_vjMI9nE4adEdC2qqI8pa3abPDU5lfbyqDRjHl6IykzcuWYng_hCPKnJJSPTXzP4COt_P6_ZnxC1BhoJbWlwI5vofajj1nGwYUXDRBtM/s1200/13.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgctiRfVVJ85dmQmW8IJCfCAmWBeaLrBFe9a_2netqx6rxPgAyWxcya9wmw84Gj2d9Xxzqwl2ulkJ83XIbhQbX_vjMI9nE4adEdC2qqI8pa3abPDU5lfbyqDRjHl6IykzcuWYng_hCPKnJJSPTXzP4COt_P6_ZnxC1BhoJbWlwI5vofajj1nGwYUXDRBtM/w640-h480/13.jpg" width="640" /></a></div><div style="text-align: justify;">Of course the small copper sheet under the arm lowering limit adjustment screw also came off:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilSsLnUxkzsvHtS3DyRoo3HNcNXzH0lNxuOZWyfOOSXbta4-ugDEQN1VaJ5yBbZpMZS9CL1Zf8fvuX00H2tW4Oa53PQaD63yDReP5h6ZXTWOLt2fqY53Wrx-JJGw1bwyehVDEhP_R25QmDUfDbW_jB3ex0za5U1TeY9mHjOEjKMiPbf2WpOdxh8gy-7DM/s1200/14.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilSsLnUxkzsvHtS3DyRoo3HNcNXzH0lNxuOZWyfOOSXbta4-ugDEQN1VaJ5yBbZpMZS9CL1Zf8fvuX00H2tW4Oa53PQaD63yDReP5h6ZXTWOLt2fqY53Wrx-JJGw1bwyehVDEhP_R25QmDUfDbW_jB3ex0za5U1TeY9mHjOEjKMiPbf2WpOdxh8gy-7DM/w640-h480/14.jpg" width="640" /></a></div><div style="text-align: justify;">It is originally attached with double sided tape. I usually clean the tape residue off and then epoxy it back into place. </div></div><div style="text-align: justify;">After re-installing the sensor arm it was time to focus on rebuilding the electronics. I started out with the main PCB. It has two power transistors mounted on the solder side, i.e. they are accessible from the top while the board is still bolted in place. It is good practice to start with replacing them first since they need to be bolted to the PCB in the correct location to match up with the PCB mounting holes (essentially, the design uses the mounting posts on the enclosure as heat sinks for the transistors).</div><div><div style="text-align: justify;">This shows IC1 as an example. It is originally a TIP120 npn Darlington:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgxpPUSv0hZiBkKgG48VioYIx4c13xKnH03shSgZvKwe3MlUp0WTiBQnW-AFByZ3lCQw1yJEfFN9FYt1m_oCsyQMmYf7z-XRV4yP_kW8yLduqRsAo_bL7cPnSToYWQOa43eC9EAKZqhkPKLYhco5Fgilshnj4LZ2tzCNRw13F0KzjS6GdJOGoU23gR2TKM/s1200/15.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgxpPUSv0hZiBkKgG48VioYIx4c13xKnH03shSgZvKwe3MlUp0WTiBQnW-AFByZ3lCQw1yJEfFN9FYt1m_oCsyQMmYf7z-XRV4yP_kW8yLduqRsAo_bL7cPnSToYWQOa43eC9EAKZqhkPKLYhco5Fgilshnj4LZ2tzCNRw13F0KzjS6GdJOGoU23gR2TKM/w640-h480/15.jpg" width="640" /></a></div><div style="text-align: justify;">I usually replace it with a stronger TIP102 for longevity:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjd9vFBdUht1cdC4-gWRRf4_Wqz7fHkT2EY-3BVYfPl0-tQK_vTlZ2otuzOsPqP62gKCyxPNNkyjbsag0W8Y6qa-i739mwNrWRbY3CihjCFvSWkp6JxDFfyF_UBu4bOxTEkUMmXRqvM930w5MSB7LcqxIv0P_ct-S-EExyXA5uuAH7XBXdlX2sQ68hHxsE/s1200/16.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjd9vFBdUht1cdC4-gWRRf4_Wqz7fHkT2EY-3BVYfPl0-tQK_vTlZ2otuzOsPqP62gKCyxPNNkyjbsag0W8Y6qa-i739mwNrWRbY3CihjCFvSWkp6JxDFfyF_UBu4bOxTEkUMmXRqvM930w5MSB7LcqxIv0P_ct-S-EExyXA5uuAH7XBXdlX2sQ68hHxsE/w640-h480/16.jpg" width="640" /></a></div><div style="text-align: justify;">For some reason the installation of modern TIP devices causes unwanted oscillations on the 21V power rail, which can throw off the record detection circuit. This issue can be squashed by installing a 100nF capacitor on the output of the TIP (yellow device in the picture above).</div></div><div><div style="text-align: justify;">After replacing the other power transistor I removed the board to get to the components on the other side:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEidk9yM20MtrKUjEf76GOyJ-ecB5urhYX77Y62Dek6UlbC2trgRdZdHyl-PLRwVFAkuqmknh_Gfv8_6nzYJqNMXRSWoB3GIzKTzaqsfkM1icaZqFU7DtUYxG7ymQgTAQCDN4i9HI5c70dCxYbiFlFU9w4h6_dmulOCPFIKRyC_E97JNnNVqP4Of8XnHlQ8/s1200/17.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEidk9yM20MtrKUjEf76GOyJ-ecB5urhYX77Y62Dek6UlbC2trgRdZdHyl-PLRwVFAkuqmknh_Gfv8_6nzYJqNMXRSWoB3GIzKTzaqsfkM1icaZqFU7DtUYxG7ymQgTAQCDN4i9HI5c70dCxYbiFlFU9w4h6_dmulOCPFIKRyC_E97JNnNVqP4Of8XnHlQ8/w640-h480/17.jpg" width="640" /></a></div><div style="text-align: justify;">This shows a close-up of the RPM control section of the circuit, composed of RPM relay and RPM trimmers:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6JY6v-aHzigHpNAQQqEv-HyBEF3mSDERSqe-a9KuHiBGih971c0wd29Jtc3hZ_YQdkT9AeKbkUAW7hvJCTxldUR1jb4ngyCNrBvR8GIXcKZ5yh-L4QPxMDmcWCVy0S8PVe1qIjiIS1OtMnpBHDy3w4kROb7Pvl8IVs4zs8l4GnhNBuQYex6MBTMxhCjQ/s1200/18.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6JY6v-aHzigHpNAQQqEv-HyBEF3mSDERSqe-a9KuHiBGih971c0wd29Jtc3hZ_YQdkT9AeKbkUAW7hvJCTxldUR1jb4ngyCNrBvR8GIXcKZ5yh-L4QPxMDmcWCVy0S8PVe1qIjiIS1OtMnpBHDy3w4kROb7Pvl8IVs4zs8l4GnhNBuQYex6MBTMxhCjQ/w640-h480/18.jpg" width="640" /></a></div><div style="text-align: justify;">I replaced all electrolytic capacitors, all power transistors, the high-gain transistor of the record sensor circuit and the RPM components:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhwjAHQMGqW-eb7hvnRmRdoMZtkH72n_RhyLJZumKUDHG2zuW-9FPPu_9_sTz96LNEFeC9XLnRQRhug9Ku019KYJ4artMN2D3gyVqBWQ74SQ-IKrA54Uk3eWtA81j0SQdS6ji5xOiEouiowIyIoUaY_kZnAh1lO8uHZCRbnleVg_X6hHm7BzntWSG4qvZo/s1200/19.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhwjAHQMGqW-eb7hvnRmRdoMZtkH72n_RhyLJZumKUDHG2zuW-9FPPu_9_sTz96LNEFeC9XLnRQRhug9Ku019KYJ4artMN2D3gyVqBWQ74SQ-IKrA54Uk3eWtA81j0SQdS6ji5xOiEouiowIyIoUaY_kZnAh1lO8uHZCRbnleVg_X6hHm7BzntWSG4qvZo/w640-h480/19.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the rebuilt RPM section with the new relay and modern 25-turn trimmers enabling a more accurate RPM adjustment:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaUic5Y42EzqOQ6HdILII_CU0ata5LNP2x_YK8CbwN4ZSb4PD9W-dQor8BEuZCxLLAzJdQX8GxQt-yQhCIYyEw1qntAURdRyobYKbSg0TF09Lj-W1M5Hbn0P7f7NBkboEtNw4f30NfSIaq6jpTWaZEsE74qqwILeZxZiEYlgZPlJgstTLGWf54fMiapW8/s1200/20.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaUic5Y42EzqOQ6HdILII_CU0ata5LNP2x_YK8CbwN4ZSb4PD9W-dQor8BEuZCxLLAzJdQX8GxQt-yQhCIYyEw1qntAURdRyobYKbSg0TF09Lj-W1M5Hbn0P7f7NBkboEtNw4f30NfSIaq6jpTWaZEsE74qqwILeZxZiEYlgZPlJgstTLGWf54fMiapW8/w640-h480/20.jpg" width="640" /></a></div><div style="text-align: justify;">The next step was replacing the four incandescent light bulbs that are used for various functions of the Beogram with LED assemblies. LEDs promise to live much longer than incandescent bulbs.</div></div><div><div style="text-align: justify;">First I replaced the bulb in the tracking sensor. This shows the original setup:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgE4kvlvIniWquw8ETZtnP9WTUStI-f5mWDSLelj-1y9M4KOEK3vzjOaFU9zVuR4LlVjg8LgZvN8YdCbFTbirnK78dgv1EZrXFwFqCRQ96XWme1MUjLnZAUCzPPZVyn1tFB7q-VYW_DpH5KcsBO_xV6V7PLGY1kxfGKq8JLpYdiIe7e9CpRpXunda5VjnQ/s1200/21.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgE4kvlvIniWquw8ETZtnP9WTUStI-f5mWDSLelj-1y9M4KOEK3vzjOaFU9zVuR4LlVjg8LgZvN8YdCbFTbirnK78dgv1EZrXFwFqCRQ96XWme1MUjLnZAUCzPPZVyn1tFB7q-VYW_DpH5KcsBO_xV6V7PLGY1kxfGKq8JLpYdiIe7e9CpRpXunda5VjnQ/w640-h480/21.jpg" width="640" /></a></div><div style="text-align: justify;">I removed the original bulb housing. This shows it in direct comparison to the Beolover LED replacement assembly:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgGhyphenhyphenQQ12sXQYb0FcEpRrF_BA89X6l_p7Pd1SU4Xdd5AsFVOstK-xbQyY5t8FEJOnhIDNO2HrwFj3qBSUNftmy8_Z5aiSGJg371fitXG9Ru6F_sCyvv7M7iLbG_gFxkxt_ijtyle81nVpdqdnxKSUmI1XGHoKyr8b0DSY6lOysJniD_we7UiaJdTUN6X8Y/s1200/22.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgGhyphenhyphenQQ12sXQYb0FcEpRrF_BA89X6l_p7Pd1SU4Xdd5AsFVOstK-xbQyY5t8FEJOnhIDNO2HrwFj3qBSUNftmy8_Z5aiSGJg371fitXG9Ru6F_sCyvv7M7iLbG_gFxkxt_ijtyle81nVpdqdnxKSUmI1XGHoKyr8b0DSY6lOysJniD_we7UiaJdTUN6X8Y/w640-h480/22.jpg" width="640" /></a></div><div style="text-align: justify;">A small SMD LED is doing the job of the bulb. It is located approximately at the location of the bulb filament. I installed the LED part:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_HHP1S3P0cIVFI1q-zk93MJt0_fbVLOzVGpcLDCGkcMMgO-gzGtAW-E3V_7Vb88QT3jd_Iz4TLav3_mvOBcE0dnyn16tAQ9H54-YYPAzhNlswrggHbEl0i-NQN8Z3AL9JopJ2HJ0beAcEXHw0NBtM77Nnf7t06aijHkyHQ1XHJD3Xo1ExesHaHtiKF48/s1200/23.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_HHP1S3P0cIVFI1q-zk93MJt0_fbVLOzVGpcLDCGkcMMgO-gzGtAW-E3V_7Vb88QT3jd_Iz4TLav3_mvOBcE0dnyn16tAQ9H54-YYPAzhNlswrggHbEl0i-NQN8Z3AL9JopJ2HJ0beAcEXHw0NBtM77Nnf7t06aijHkyHQ1XHJD3Xo1ExesHaHtiKF48/w640-h480/23.jpg" width="640" /></a></div><div style="text-align: justify;">The small white box on top is a trimmer that allows adjusting the light intensity of the LED. This can come in handy when adjusting the tracking feedback. Next came the light bulb in the sensor arm. This shows the small compartment at the end of the arm pulled out with the bulb still installed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeeheS-aRNFiiliXp4ZJJ2C3NG3h8YOLw1Yqk4PGUgk8lr9NbzvwsZ0oKCYLxEtGHusqwbJ7fuY2eVHHYfnOCYVALTrxIe6EJ5Z5ZyCcEhG9G67KuFqE77OkQEkJcdtW_1H7DJcSOVQP34pwDJ-9i02GNpNe9zu_9YelHxmYLYab8jyYPEAHVA0lRvjuU/s1200/24.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeeheS-aRNFiiliXp4ZJJ2C3NG3h8YOLw1Yqk4PGUgk8lr9NbzvwsZ0oKCYLxEtGHusqwbJ7fuY2eVHHYfnOCYVALTrxIe6EJ5Z5ZyCcEhG9G67KuFqE77OkQEkJcdtW_1H7DJcSOVQP34pwDJ-9i02GNpNe9zu_9YelHxmYLYab8jyYPEAHVA0lRvjuU/w640-h480/24.jpg" width="640" /></a></div><div style="text-align: justify;">Next to the compartment is the Beolover LED replacement together with its alignment aid.</div></div><div><div style="text-align: justify;">This shows the small board installed with the extracted bulb:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6qQ20KbgqG7eWFgWPqJDwz3T9zEoDHdb8Ygj4M8t_yx4aQCeKbofh2hMNCF8p3DBs0LxNKT8_15gcFknEcpnfspYGW4yL_BViluiNTlDb7pTfNBDgMDQhraHmv3RQPF51qdNrcAHoFPE3hZ-lW8UzDUakVJk23wiXsA_v8ldRXP-XvuWcWp7E2I0ZtF0/s1200/25.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6qQ20KbgqG7eWFgWPqJDwz3T9zEoDHdb8Ygj4M8t_yx4aQCeKbofh2hMNCF8p3DBs0LxNKT8_15gcFknEcpnfspYGW4yL_BViluiNTlDb7pTfNBDgMDQhraHmv3RQPF51qdNrcAHoFPE3hZ-lW8UzDUakVJk23wiXsA_v8ldRXP-XvuWcWp7E2I0ZtF0/w640-h480/25.jpg" width="640" /></a></div><div style="text-align: justify;">The final two bulbs are located in the RPM adjustment panel. This shows the panel taken out:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1Tj3XHpmZV5ALrBxD30UASdJwh23jw-N8gSGmWe82Wz2p-HnP2TcMf0DiRhr3MazkqaSu9Nys3eTDe5zT5usr8Pd_N2hSvytW9IVfYsi3QLUo-w-4kLpuZZJELSHFKPpgWWRQJuglW9v19F1cXFXziK-GS58lmeK6oYLZjbSpodQcyxccsL-nYk4UQdc/s1200/26.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1Tj3XHpmZV5ALrBxD30UASdJwh23jw-N8gSGmWe82Wz2p-HnP2TcMf0DiRhr3MazkqaSu9Nys3eTDe5zT5usr8Pd_N2hSvytW9IVfYsi3QLUo-w-4kLpuZZJELSHFKPpgWWRQJuglW9v19F1cXFXziK-GS58lmeK6oYLZjbSpodQcyxccsL-nYk4UQdc/w640-h480/26.jpg" width="640" /></a></div><div style="text-align: justify;">I removed the bulb covers. This shows the bulbs still in place together with the Beolover LED replacements:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgwXzi20CB3hl2RVhyphenhyphengLiZeBgSMWKis_znHrL3st_NtUSZbdEzUZDcaVtUUb_tFy2CHlswVNiJ3Mt0ZJWJbhRadi9gJEYSA6cGS3kCsdZ31vPYZVvKW-KSIs6JAkCmqVsyq-vXO-NbzIUznDn4psRGcK1Idu6RoL-QC1y5E50-Z10pW6Kowf8NOis0wcSA/s1200/27.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgwXzi20CB3hl2RVhyphenhyphengLiZeBgSMWKis_znHrL3st_NtUSZbdEzUZDcaVtUUb_tFy2CHlswVNiJ3Mt0ZJWJbhRadi9gJEYSA6cGS3kCsdZ31vPYZVvKW-KSIs6JAkCmqVsyq-vXO-NbzIUznDn4psRGcK1Idu6RoL-QC1y5E50-Z10pW6Kowf8NOis0wcSA/w640-h480/27.jpg" width="640" /></a></div><div style="text-align: justify;">The LED assemblies solder directly to the solder points of the bulb:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhF6RvoJZsglblCieTXKRPOKKY1ML4_iQwuYiJS6KUfnkU0523iHnDh-FBHvmVoZ4lF8tRGDlxJHjy6d8px5eMjmeOXNP8DOG-mGsxS8wSmtxSC70EUFHIVjQ_SWMWYUp1BwtVRcz4oGo44jpaJ6qNL5RqrC_oR-e8Gjwr9yr4udGAju5VzXynN-sIDSQY/s1200/28.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhF6RvoJZsglblCieTXKRPOKKY1ML4_iQwuYiJS6KUfnkU0523iHnDh-FBHvmVoZ4lF8tRGDlxJHjy6d8px5eMjmeOXNP8DOG-mGsxS8wSmtxSC70EUFHIVjQ_SWMWYUp1BwtVRcz4oGo44jpaJ6qNL5RqrC_oR-e8Gjwr9yr4udGAju5VzXynN-sIDSQY/w640-h480/28.jpg" width="640" /></a></div><div style="text-align: justify;">This shows one of them in detail:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgk-ciit9ALSHwQyDDNGzg1Fbir_yQPSbQ_VzjzaPYiait3FKKigSrWD3kPese3wAUgkd371p8HAOZOJTP5F_xNWwn5G2lbPBjnVX_cWzY8FHS4KfAtHVbVS1dKz4GOaoer5WfLD3qQ9Fk1MN5oGOf9Map5nnjxCc1Fxquv-2VhbnM6l_SQca_7RNrEGE0/s1200/29.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgk-ciit9ALSHwQyDDNGzg1Fbir_yQPSbQ_VzjzaPYiait3FKKigSrWD3kPese3wAUgkd371p8HAOZOJTP5F_xNWwn5G2lbPBjnVX_cWzY8FHS4KfAtHVbVS1dKz4GOaoer5WfLD3qQ9Fk1MN5oGOf9Map5nnjxCc1Fxquv-2VhbnM6l_SQca_7RNrEGE0/w640-h480/29.jpg" width="640" /></a></div><div style="text-align: justify;">The small boards essentially form an extension of the PCB that holds the bulbs. After installation the bulb covers can be re-installed without interference:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhYBbyRiIzofV2qOhjJxPvNm4DYnP8uRf5sLfw2aMyXqQaCu9nh-a92CeoxO4Lo5tgULZc7CQ_DcrDKnLtjpyjDeRzLI17hqixJANCVTWPqbbin8aA5SKRLos5WUahvEKnTL0Fm1ouT55KnGAAKDZBJ1ikn2dq10M57cN4VQjx6hyl7ITCeADx6mRiooA/s1200/30.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhYBbyRiIzofV2qOhjJxPvNm4DYnP8uRf5sLfw2aMyXqQaCu9nh-a92CeoxO4Lo5tgULZc7CQ_DcrDKnLtjpyjDeRzLI17hqixJANCVTWPqbbin8aA5SKRLos5WUahvEKnTL0Fm1ouT55KnGAAKDZBJ1ikn2dq10M57cN4VQjx6hyl7ITCeADx6mRiooA/w640-h480/30.jpg" width="640" /></a></div><div style="text-align: justify;">When I extracted the RPM panel from the keypad cluster, I found cracked RPM panel holders on both sides:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiTfCn6Sqe9Qe-btH2B2NZYQ2CBPjfvJO1vXldkCNFj0Q0NsfkNLYSPuhs3oWG1eW1h6K3lm1jvn7HI-uF-UXP0AQpBHGcpmFZUF2im4n3vc27LIC9pZkmqt7Er81XsAl5mKhz5XEAj66BYwa8qnplgMPw2_SrYytMEUJjgMN0bwHq10bzhT5UVruKhnB4/s1200/31.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiTfCn6Sqe9Qe-btH2B2NZYQ2CBPjfvJO1vXldkCNFj0Q0NsfkNLYSPuhs3oWG1eW1h6K3lm1jvn7HI-uF-UXP0AQpBHGcpmFZUF2im4n3vc27LIC9pZkmqt7Er81XsAl5mKhz5XEAj66BYwa8qnplgMPw2_SrYytMEUJjgMN0bwHq10bzhT5UVruKhnB4/w640-h480/31.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhl7cJ8HHYqQiX3lsmLdPSLubKKI4Nu-G5n_NtYvjlBfUi9vMzTthLyXnswYetXbVt65_vcwrcjUAjc4qrPP5hQf-QIAsyxnK5SABxFjZ5KoaXbhXuQmwBSVcfShUgq4CI5sRgXawINjBNi4suVzx1ngliHxeJouZ_iUojlH9kSdyuPASmS3pfcDz4uGS4/s1200/32.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhl7cJ8HHYqQiX3lsmLdPSLubKKI4Nu-G5n_NtYvjlBfUi9vMzTthLyXnswYetXbVt65_vcwrcjUAjc4qrPP5hQf-QIAsyxnK5SABxFjZ5KoaXbhXuQmwBSVcfShUgq4CI5sRgXawINjBNi4suVzx1ngliHxeJouZ_iUojlH9kSdyuPASmS3pfcDz4uGS4/w640-h480/32.jpg" width="640" /></a></div><div style="text-align: justify;">This seems to happen fairly often, possibly due to misalignment during RPM panel manipulation. Luckily, there are now <a href="https://www.beoparts-shop.com/product/holder-for-dial-panel-for-beogram-4002-4004-6000/" target="_blank">reproduction parts available from the Beoparts-store in Denmark</a>. All one has to do is extracting the springs from the old cracked parts and transfer them to the new ones. This shows one of the new ones installed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyuSvSVtC5A4_3oiZnge_SvS_zjsdNinTfCugXKFevyFRmG5WsVfAC3st48uaheTVg4oZ2hN-vpvOK6okH2xVUxv3AgJU6DZ-yTgkYNBygnDbHmH50OrsSHo2hT4vDphWfuX8nyZQNI67tNZKJGPgfbn4CIieLOHW_TTAlTNJOPCDB5EEkSvoog20f9g8/s1200/33.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyuSvSVtC5A4_3oiZnge_SvS_zjsdNinTfCugXKFevyFRmG5WsVfAC3st48uaheTVg4oZ2hN-vpvOK6okH2xVUxv3AgJU6DZ-yTgkYNBygnDbHmH50OrsSHo2hT4vDphWfuX8nyZQNI67tNZKJGPgfbn4CIieLOHW_TTAlTNJOPCDB5EEkSvoog20f9g8/w640-h480/33.jpg" width="640" /></a></div><div style="text-align: justify;">With the keypad out, the output board could be extracted:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGzFgbFCCKwbbYkgXnnOciFKlrP5acxdDvASp18sthi0j7-dZuc2u_aWbHkexotM-upaOtuA-3s4VqEj9bFWdm27hNkf52lI98rDLtq9ZSjwimFZPKdR6u8VflWjqvqlIaasVV6eO8QJic9hOIl_Nm6XrsxOnGAsb6bjlecfBBVWAiMlrx4LtC35JXZPM/s1200/34.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGzFgbFCCKwbbYkgXnnOciFKlrP5acxdDvASp18sthi0j7-dZuc2u_aWbHkexotM-upaOtuA-3s4VqEj9bFWdm27hNkf52lI98rDLtq9ZSjwimFZPKdR6u8VflWjqvqlIaasVV6eO8QJic9hOIl_Nm6XrsxOnGAsb6bjlecfBBVWAiMlrx4LtC35JXZPM/w640-h480/34.jpg" width="640" /></a></div><div style="text-align: justify;">It does not have many components in the 4002:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg11ReP57trU507qe634jUUTkINM4khhM-nzn_W2hfhm1ozZOB-kperPJuj0qulmd8A1F3zi2vuVOZNTK8sijdeYmBbQS4sKbbpkaklXpFHFNuYsccpc3GGWnMln898XmZ7fj0jQLkcnD7DDJ367H4yY9VqGwluCbZOACtyAtxpfzGQj0W2H6aVqsxEOkA/s1200/35.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg11ReP57trU507qe634jUUTkINM4khhM-nzn_W2hfhm1ozZOB-kperPJuj0qulmd8A1F3zi2vuVOZNTK8sijdeYmBbQS4sKbbpkaklXpFHFNuYsccpc3GGWnMln898XmZ7fj0jQLkcnD7DDJ367H4yY9VqGwluCbZOACtyAtxpfzGQj0W2H6aVqsxEOkA/w640-h480/35.jpg" width="640" /></a></div><div style="text-align: justify;">I replaced the output relay and the electrolytic capacitor that defines the arm lowering time constant. I also installed a (red) switch that allows connecting system and signal grounds in case there is a hum issue:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6iLX3t5-EZHSrk52nxunobqMMroq7jZifyV7-_cSC3FsCBb758Y2S7Qt3dTaAFypFjzQAOyJQ4J8ooqX5_f-LNdbl2JKwNb_8ot70lyaB4AZiEirjBwUPEI6_hlAbeWnqmBtNG6c78DcunHktvUMMULtTkCVlnyau05X6v1sKM83w7v7JN2odUbYBIts/s1200/36.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6iLX3t5-EZHSrk52nxunobqMMroq7jZifyV7-_cSC3FsCBb758Y2S7Qt3dTaAFypFjzQAOyJQ4J8ooqX5_f-LNdbl2JKwNb_8ot70lyaB4AZiEirjBwUPEI6_hlAbeWnqmBtNG6c78DcunHktvUMMULtTkCVlnyau05X6v1sKM83w7v7JN2odUbYBIts/w640-h480/36.jpg" width="640" /></a></div><div style="text-align: justify;">Then it was time to remove the floating chassis for cleaning out any debris from the degrading transport lock bushings:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVSmaSrW545Yf3SN0WjTSxflRp_Y95IivJws9l2rkss24aKboD4PEhC7PDSOvqFLp8A4pqo1fy8AvoQ6hfLlyDgVWUSziqzanxIo7uY8j4IraGzE_QXClu-ZlTiSdI5LsHTyM-8XB7uJphQCbAd81MIiNkYXCaKzFzuz_y51nsoHtoLZfPUPvTccJBD3E/s1200/37.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVSmaSrW545Yf3SN0WjTSxflRp_Y95IivJws9l2rkss24aKboD4PEhC7PDSOvqFLp8A4pqo1fy8AvoQ6hfLlyDgVWUSziqzanxIo7uY8j4IraGzE_QXClu-ZlTiSdI5LsHTyM-8XB7uJphQCbAd81MIiNkYXCaKzFzuz_y51nsoHtoLZfPUPvTccJBD3E/w640-h480/37.jpg" width="640" /></a></div><div style="text-align: justify;">This is a common issue with the 4002 and these bushings need to be replaced. This shows the emptied out enclosure:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjl_px9ewOLwvPlzMZfj3N11otkUklOrGIGWkrFP9Ks5cGu1NYbLjZf2bfj91MapZW2i9UfV1mPXm4j9YjAjyNLl8j09oOdTXh5C6_FqZzOcYCKmAZl9J5ReEL-hcpIEP8U4NotndFWKvoufzVwvbh8YiZ7ROzPYc2oC_ha_yiYK3yKMMm6RAQ_Hy4pjY0/s1200/38.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjl_px9ewOLwvPlzMZfj3N11otkUklOrGIGWkrFP9Ks5cGu1NYbLjZf2bfj91MapZW2i9UfV1mPXm4j9YjAjyNLl8j09oOdTXh5C6_FqZzOcYCKmAZl9J5ReEL-hcpIEP8U4NotndFWKvoufzVwvbh8YiZ7ROzPYc2oC_ha_yiYK3yKMMm6RAQ_Hy4pjY0/w640-h480/38.jpg" width="640" /></a></div><div style="text-align: justify;">After vacuuming it out it was time to install the new bushings and then put the deck back together. The Beolover replacement bushings are designed for easy installation. They consist of two equal parts that simply insert from top and bottom into the orifices on the floating chassis:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_v_Pxx6hYStDhedgHefgdgx_I_sbltQSSX8cDa7XY_jLBL308Tah4hckF_ZuArPFLObaiIDp_ijS3wvZ19xzRLo63fkzGLpki5mtkFNYF8DFpA-p7gu2GCLqC2gDxe6x9qanHvPIKVEFVmHSkJSDjutJFPVHg7ckaSmq0OL5vmFctz9U0ZMzc6yZEcXU/s1200/39.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_v_Pxx6hYStDhedgHefgdgx_I_sbltQSSX8cDa7XY_jLBL308Tah4hckF_ZuArPFLObaiIDp_ijS3wvZ19xzRLo63fkzGLpki5mtkFNYF8DFpA-p7gu2GCLqC2gDxe6x9qanHvPIKVEFVmHSkJSDjutJFPVHg7ckaSmq0OL5vmFctz9U0ZMzc6yZEcXU/w640-h480/39.jpg" width="640" /></a></div><div style="text-align: justify;">This shows one of the bushings installed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiilu8RHQ-j4nbdoAzk5AfzqFRDKN3EBI63myEj8HnHZr38-lwOPaXD6ZYna_l38wxksFoRum-wGrkRuroG5VR_YKb2RZGbsib5F6Z-rO-oH-rdqrTnHkZy5NeQriXfVPQNcNICnJajBz-l3sS7l5hurU6E0NJoDyOIhoihxNvYIoDlzXCx5t8N1N8fh-U/s1200/40.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiilu8RHQ-j4nbdoAzk5AfzqFRDKN3EBI63myEj8HnHZr38-lwOPaXD6ZYna_l38wxksFoRum-wGrkRuroG5VR_YKb2RZGbsib5F6Z-rO-oH-rdqrTnHkZy5NeQriXfVPQNcNICnJajBz-l3sS7l5hurU6E0NJoDyOIhoihxNvYIoDlzXCx5t8N1N8fh-U/w640-h480/40.jpg" width="640" /></a></div><div style="text-align: justify;">At this point I also replaced the original reservoir capacitor. This Beogram 4002 came 'ready for installation of a CD-4 output board', i.e. has a dual capacitance reservoir capacitor. It essentially contains two capacitors (1000 uF and 4700 uF) with a common ground connector:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2OzAj97WLrnUKI2ABi_Ho0XBiE_vyP5boXnJv0YdSLdarKquQ9zI_0uqzFZy1q9918ApzY_aKWQI6JDr8xlpi2sgn7ilbEn1dTQbbdcJvfTkON9gPVaZd6dZQwLExiCZR0gpiRSJ3zVZaxTtWLiodQ_w4p8vDsh6q6JuSFehrV75pAq-Qwnch4foK96s/s1200/41.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2OzAj97WLrnUKI2ABi_Ho0XBiE_vyP5boXnJv0YdSLdarKquQ9zI_0uqzFZy1q9918ApzY_aKWQI6JDr8xlpi2sgn7ilbEn1dTQbbdcJvfTkON9gPVaZd6dZQwLExiCZR0gpiRSJ3zVZaxTtWLiodQ_w4p8vDsh6q6JuSFehrV75pAq-Qwnch4foK96s/w640-h480/41.jpg" width="640" /></a></div><div style="text-align: justify;">The other end of the can has two contacts, one per capacitor:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjTJIrynwSV-O6WlCMct9owvUgAFpXcA0O-ynKNtzkFBWOigyxPeuLo2nqyPxNtG_vWWcDSARqEfPv5yF5sC4xS2_RnjSNWr0CdVAj15LZWCUVp3qDZYOlYevowy0cD-0bgtRBjk4Nx0za3Gnu3IkmsMRagubCZcj0re1uA-sg7d0c5huxRobTgMX-T66E/s1200/42.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjTJIrynwSV-O6WlCMct9owvUgAFpXcA0O-ynKNtzkFBWOigyxPeuLo2nqyPxNtG_vWWcDSARqEfPv5yF5sC4xS2_RnjSNWr0CdVAj15LZWCUVp3qDZYOlYevowy0cD-0bgtRBjk4Nx0za3Gnu3IkmsMRagubCZcj0re1uA-sg7d0c5huxRobTgMX-T66E/w640-h480/42.jpg" width="640" /></a></div><div style="text-align: justify;">Such capacitors are not manufactured anymore and so I designed an assembly composed of the two modern capacitors and a 3D printed holder that fits into the mounting clamp of the original setup:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmANFC9jbmWXTKBCjim1TiARxrwoo8SNE9k4kIc8_pecLaXyt20pTtxRkzKBBhNgSnDs4JemIbLCvai3xvNwfdWdelK-_uKjXN-4gOjeXmFuH6138_uWNgl0_BqrkEaPaxvOdMO-ZUpbbOtx1hNAe0Pg8fi0pptO8pjxbdhZyq5wCLkYzq84Xu3jYIilg/s1200/43.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmANFC9jbmWXTKBCjim1TiARxrwoo8SNE9k4kIc8_pecLaXyt20pTtxRkzKBBhNgSnDs4JemIbLCvai3xvNwfdWdelK-_uKjXN-4gOjeXmFuH6138_uWNgl0_BqrkEaPaxvOdMO-ZUpbbOtx1hNAe0Pg8fi0pptO8pjxbdhZyq5wCLkYzq84Xu3jYIilg/w640-h480/43.jpg" width="640" /></a></div><div style="text-align: justify;">Once everything was together again, it was time to tie up some loose ends. First came the adjustment of the sensor arm transistor bias to yield 4V at the collector. I usually do this with the trimmer temporarily installed on the solder side of the board so it is accessible while the deck is powered up:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjHc1W7LdP2m7bUNneKjGRnkh_5_CnEPe8i7KFp5TmaINilOobWy-dMRK2HeA7qbAjH3fOpBABt5Cf0w8pUQStmUgp52dPHqYmS9P1FUYIYjb6Z4FlE86Xoxaunso6cPFtZrblFWSAikMEfJnKuKpE_68wLJGIq4CYXafXnnFMOqbTdOTjDFcvlxCVLp7w/s1200/44.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjHc1W7LdP2m7bUNneKjGRnkh_5_CnEPe8i7KFp5TmaINilOobWy-dMRK2HeA7qbAjH3fOpBABt5Cf0w8pUQStmUgp52dPHqYmS9P1FUYIYjb6Z4FlE86Xoxaunso6cPFtZrblFWSAikMEfJnKuKpE_68wLJGIq4CYXafXnnFMOqbTdOTjDFcvlxCVLp7w/w640-h480/44.jpg" width="640" /></a></div><div style="text-align: justify;">Once it has been set, I remove it and install it in the location of the original fixed 1MOhm transistor on the component side. Here you can see it with the new BC549C high-gain sensor transistor (the original ones are often out of spec and do not have enough gain anymore for reliable record detection):</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-3kiUaa8uWbiZgH-t8mOQVt0YTszsSdO7qsHRCLnyM-lm1XDPP-8b9VeSJdwdyMD5gYa3oMEtiTyIT13cHRVrAPRqbaGJc08daKr3YVWA5Nm9d7RZ7OKUqJR73NjC_2VAo8P1wfXmYpts1cw1hw2fyGjpRHovGjajuAfLN5YiezGgNAmvqmTrfg1VJjo/s1200/45.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-3kiUaa8uWbiZgH-t8mOQVt0YTszsSdO7qsHRCLnyM-lm1XDPP-8b9VeSJdwdyMD5gYa3oMEtiTyIT13cHRVrAPRqbaGJc08daKr3YVWA5Nm9d7RZ7OKUqJR73NjC_2VAo8P1wfXmYpts1cw1hw2fyGjpRHovGjajuAfLN5YiezGgNAmvqmTrfg1VJjo/w640-h480/45.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">Then it was time to check the sensor response with an oscilloscope. This shows the sensor response I measured at the collector of TR3 with the platter manually rotated:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjCF7k1uOvJASbGGv5qqwL_asDYnhMFZSjJpFWxDpnv2Y8sUi2_nGDKkIJWhMR2nZJYS2TpqgSiD7r0X-0kpzMcUmdwM0skTPNCtvFQ2d7ge_McqVd9qcidxJ3GYOAzG-qR-VCx2i_CSKpp83vGyFSWa44_nF75zIh1iwnanu49DeXNFbdoTaX0n58JUNs/s1200/54a.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="914" data-original-width="1200" height="488" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjCF7k1uOvJASbGGv5qqwL_asDYnhMFZSjJpFWxDpnv2Y8sUi2_nGDKkIJWhMR2nZJYS2TpqgSiD7r0X-0kpzMcUmdwM0skTPNCtvFQ2d7ge_McqVd9qcidxJ3GYOAzG-qR-VCx2i_CSKpp83vGyFSWa44_nF75zIh1iwnanu49DeXNFbdoTaX0n58JUNs/w640-h488/54a.jpg" width="640" /></a></div></div><div><div style="text-align: justify;">The signal looks perfect and its amplitude exceeds the 5V spec in the manual, i.e. everything is beolovely now in the sensor department! Here a couple pictures of the visible LEDs in action. This is the sensor arm:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgL_b83y65maHCqtUv3Z9jiKvbqflfID2PS4SBIQiWANQovUdIVkQqSmHIHhv99BT7wIjp82RmiHh5IURtj54pj9Gio7GTV7zHt3AzIt8WxrRdmEjhgfb1zNm4_U22V4oCkY5ZDCnd-4OjzuJPH-mlrxPtaYuE9tHUB81ov4arUYpMu4uuZglk6OzdafjM/s1200/46.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgL_b83y65maHCqtUv3Z9jiKvbqflfID2PS4SBIQiWANQovUdIVkQqSmHIHhv99BT7wIjp82RmiHh5IURtj54pj9Gio7GTV7zHt3AzIt8WxrRdmEjhgfb1zNm4_U22V4oCkY5ZDCnd-4OjzuJPH-mlrxPtaYuE9tHUB81ov4arUYpMu4uuZglk6OzdafjM/w640-h480/46.jpg" width="640" /></a></div><div style="text-align: justify;">Since I use a warm-white LED it has enough red photons to properly illuminate the B&O logo. This is a picture of the 33 RPM trimmer illuminated by LEDs:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCIGdVn8cOP-5kQ8q5bH7dA31YfBddLpcJ1Rfqg2tveT4BMBJ2AxPD2hGUfwmUf3P8aA7QER0ml3L_a40Q7MgcV1t317h-zjggyjd3pF3BtGbWN1XwPCwatON7eKjAG0ZUxp2vnb0z8iP20uaHmRAaYJEXaW7uX6vLECARCul67deIfqC-cCi83T20uhE/s1200/47.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiCIGdVn8cOP-5kQ8q5bH7dA31YfBddLpcJ1Rfqg2tveT4BMBJ2AxPD2hGUfwmUf3P8aA7QER0ml3L_a40Q7MgcV1t317h-zjggyjd3pF3BtGbWN1XwPCwatON7eKjAG0ZUxp2vnb0z8iP20uaHmRAaYJEXaW7uX6vLECARCul67deIfqC-cCi83T20uhE/w640-h480/47.jpg" width="640" /></a></div><div style="text-align: justify;">Also a very nice natural incandescent look.</div></div><div><div style="text-align: justify;">At this point the motor bearings had finished their infusion. I extracted them from the oil</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhyYmlMAo8DQIL3bO5QPgTG-TS9hPnQ7wrYdQxBzH5ZGZjoP1Hc37nnheBaBb09WOR6-Gr84OMzVgO77a_CJxtQRYU5qK2L18fO04LUWBt7DnGpD2hxosFTM4tm8-xZN7gTXrPgXOO75Wf0LkZ3uTXajygE8a4WzVTjjl-lE5Wy1NeQmEcE6XwD3Zi2-s/s1200/48.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhyYmlMAo8DQIL3bO5QPgTG-TS9hPnQ7wrYdQxBzH5ZGZjoP1Hc37nnheBaBb09WOR6-Gr84OMzVgO77a_CJxtQRYU5qK2L18fO04LUWBt7DnGpD2hxosFTM4tm8-xZN7gTXrPgXOO75Wf0LkZ3uTXajygE8a4WzVTjjl-lE5Wy1NeQmEcE6XwD3Zi2-s/w640-h480/48.jpg" width="640" /></a></div><div style="text-align: justify;">and re-assembled the motor. I installed it in the Beogram and adjusted the RPM trimmers on the PCB to get the proper 33.33 and 45 RPMs:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjHi4nJJBJRY3YCg4m6oL8p340MgvDaI30AECZM4VlgWHGITx650K6iLWCOxk7PPYRqh8cY0Qvdwy_OyFqJhINEFXddzTLEUrJ-Bn6HlLNNtdwFJ58_uq-FW4T2UpI6_kMNFdEaEKGLyxOgCFegvuhtf28F3gTyZkoiD3EcW8fF-S2osr7qFqdYzwfCRYQ/s1200/49.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="675" data-original-width="1200" height="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjHi4nJJBJRY3YCg4m6oL8p340MgvDaI30AECZM4VlgWHGITx650K6iLWCOxk7PPYRqh8cY0Qvdwy_OyFqJhINEFXddzTLEUrJ-Bn6HlLNNtdwFJ58_uq-FW4T2UpI6_kMNFdEaEKGLyxOgCFegvuhtf28F3gTyZkoiD3EcW8fF-S2osr7qFqdYzwfCRYQ/w640-h360/49.jpg" width="640" /></a></div><div style="text-align: justify;">Next I used the BeoloverRPM device for measuring an RPM stability curve over 24 hrs. The BeoloverRPM can log the RPM in 10s intervals for extended periods of time, perfect for detecting intermittent RPM issues. This is the curve I measured:</div></div><div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4qq16iS5VxLwGnwKMmyNJphoQeZBYUj6ceQQ4i8oBm3kWN-jDrfRkOuuYRvM-NFD_p_Mfa1A7dwmUIzrFDgdsO4RrHces2573tcr9QqcsDd2WHwyVmvygF20CGXBk9DZ0xj8plAHwFGKyWB1GMBYHvR0pn4iKL52aEtwcxyblqk-rKQWhNfzqS8aDq44/s1024/Beogram%204002%20RPM%20Stability.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="593" data-original-width="1024" height="370" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4qq16iS5VxLwGnwKMmyNJphoQeZBYUj6ceQQ4i8oBm3kWN-jDrfRkOuuYRvM-NFD_p_Mfa1A7dwmUIzrFDgdsO4RrHces2573tcr9QqcsDd2WHwyVmvygF20CGXBk9DZ0xj8plAHwFGKyWB1GMBYHvR0pn4iKL52aEtwcxyblqk-rKQWhNfzqS8aDq44/w640-h370/Beogram%204002%20RPM%20Stability.jpg" width="640" /></a></div><div style="text-align: justify;">This looks pretty good for a DC-motor Beogram. The small variations are a result of the analog control system, which is susceptible to temperature variations and the moon phase (joke alert!...;-).</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">This restoration was coming to a close, and it was time to focus on the adjustments. First came the adjustment of platter height and parallelism relative to the arms, then the adjustment of the floating chassis to make the platter flush with the surrounding aluminum panels while ensuring proper ranges of motion in the three open transport locks. After this process I focused on the calibration of the tracking weight. My first step is usually replacing the flimsy original circlip that holds the adjustment screw of the counter lock in place</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjRvAZquwZ4PIxRoWG-SfF1q1qcD0LBglJIEtBSt3hzsxohnj7u1gBvgb2eHFpSLB8_ex0gslBxwkbnkQJEyS_fFVVVOMsFQFbN5t9Pu_QbtZNi4deN4OGR4I5L-xszAgUfAhXnwFbc6ZTVCSvZ-XjKDULiilBHTmWAWBnvnHMN-1_29NlnAKVByXrQ5KE/s1200/50.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjRvAZquwZ4PIxRoWG-SfF1q1qcD0LBglJIEtBSt3hzsxohnj7u1gBvgb2eHFpSLB8_ex0gslBxwkbnkQJEyS_fFVVVOMsFQFbN5t9Pu_QbtZNi4deN4OGR4I5L-xszAgUfAhXnwFbc6ZTVCSvZ-XjKDULiilBHTmWAWBnvnHMN-1_29NlnAKVByXrQ5KE/w640-h480/50.jpg" width="640" /></a></div><div style="text-align: justify;">with a M3 nut:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNXXXhp1AKWYNeeoZ14NRdU5eAtTNX-lVzGgKnm5IOsuAxkt3m9vr6c-Bn3i8ds-mtIIhpOmHbtWjKHfBdp9rQ6mJC6kyKIk022InC6UoWob4lXrBfqwnO6cVdr8cokCDOFYBo1DB57T3nynEkvhMC33ngZddg481yPSDrQc7_wM0jXFvGuXDULLY6Uyc/s1200/51.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNXXXhp1AKWYNeeoZ14NRdU5eAtTNX-lVzGgKnm5IOsuAxkt3m9vr6c-Bn3i8ds-mtIIhpOmHbtWjKHfBdp9rQ6mJC6kyKIk022InC6UoWob4lXrBfqwnO6cVdr8cokCDOFYBo1DB57T3nynEkvhMC33ngZddg481yPSDrQc7_wM0jXFvGuXDULLY6Uyc/w640-h480/51.jpg" width="640" /></a></div><div style="text-align: justify;">This nut allows locking the counterweight position reliably in place, which enables the Beogram to be shipped without the need for re-calibrating the tracking weight after arrival at the customer site.</div></div><div><div style="text-align: justify;">Then I calibrated the weight adjustment wheel to be accurate around 1.2g, which is the usual weight for B&O cartridges:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8l8s6tM0aG-ttKl-C2yNBJJYSngNVOY5mo1QspAgMzPR-oDdD78cK9SrM2JvewFdDIynL2FMHfySut4P-QvijvU92RemM9th6ADB_eFihiz_1gDGjDRNjusBW2K-oi1bRh5J6RLzLStI8ZQf51SloCEgpsUvwFnZy4dIx30qswiiJuUiykQqrjlbLKBM/s1200/53.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj8l8s6tM0aG-ttKl-C2yNBJJYSngNVOY5mo1QspAgMzPR-oDdD78cK9SrM2JvewFdDIynL2FMHfySut4P-QvijvU92RemM9th6ADB_eFihiz_1gDGjDRNjusBW2K-oi1bRh5J6RLzLStI8ZQf51SloCEgpsUvwFnZy4dIx30qswiiJuUiykQqrjlbLKBM/w640-h480/53.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">The next step was adjusting the arm lowering limit to miss the lower parts of the platter ribs by about 1mm:<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8aV5nycRpOC-6BC_B-ssZBfiihH230Fo6WpKGd20kxlfjsB3V3npUQkCCrxKHL_Wi0LXzEpwx1Vbp_FC6f6i_7YMcQFEFKezkiWLc0IgtC5qu2MS4kXSuSZfDr7FqW0o3bB3yTwdxw_jUFOaA8V20XEtnaAqgxRBXYQiNzTPFmGUFH8u_Z8B6pOxdYXY/s1200/52.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8aV5nycRpOC-6BC_B-ssZBfiihH230Fo6WpKGd20kxlfjsB3V3npUQkCCrxKHL_Wi0LXzEpwx1Vbp_FC6f6i_7YMcQFEFKezkiWLc0IgtC5qu2MS4kXSuSZfDr7FqW0o3bB3yTwdxw_jUFOaA8V20XEtnaAqgxRBXYQiNzTPFmGUFH8u_Z8B6pOxdYXY/w640-h480/52.jpg" width="640" /></a></div></div><div style="text-align: justify;">This is an important adjustment since it is a fail-safe should the circuitry ever decide to let the arm to lower on an empty spinning platter due to a circuit malfunction.</div><div><div style="text-align: justify;">The final adjustment was the tracking feedback to ensure a smooth and precise advancement of the carriage during record play:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhpsvxEnMbHcMjnaz5l1aosXddgZSuYePkg7B5GUM24IBj3Np8NEom-m_qwgYOKYxmtyQ6wefgpBapAKQUySF9lpBo8nXtkHj3zLd_icaInWjoX6i83p-cZcSwfyDSTN3nPjicrZLDbvgxwEcrFT-FS7qURk7tpuXKd9u2JrMttsUJ6g2pocqPSCLod83k/s1200/54.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhpsvxEnMbHcMjnaz5l1aosXddgZSuYePkg7B5GUM24IBj3Np8NEom-m_qwgYOKYxmtyQ6wefgpBapAKQUySF9lpBo8nXtkHj3zLd_icaInWjoX6i83p-cZcSwfyDSTN3nPjicrZLDbvgxwEcrFT-FS7qURk7tpuXKd9u2JrMttsUJ6g2pocqPSCLod83k/w640-h480/54.jpg" width="640" /></a></div><div style="text-align: justify;">My customer decided letting me install the <a href="https://beolover.blogspot.com/p/beogram-4002-remote-control.html" target="_blank">Beolover Commander remote control</a> in his Beogram. Since it still has a pretty nice keypad, I advised getting the remote control. It allows controlling all functions of the Beogram with an Apple remote so the keypad does not have to be used anymore. This preserves it in its current state.</div></div><div><div style="text-align: justify;">The Commander is easily installed in DC-motor Beograms by simply plugging it into the keypad connector, and then putting the keypad plug into the receptacle of the Commander board. The auto-repeat indicator of the Commander installs under the RPM panel. It uses the CD-4 indicator on the RPM panel to signal auto-repeat activation. This shows the commander installed:</div><div style="text-align: justify;"><br /></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjvKldDi2YRsYeuaTfi4fAsl9TyNdg29jLgqkjSyNmhQPkNth-ktVKMsZsTAZ7MeJTo9udTcWV9aw4Lnn0XawrkUA-YdtNA3gFsB1B1AmWcMEVO-xle-uXLQtCH3hwCbaEs_zSRn488NCOXh5ngSqcHWD66QRep1D3qfREHZeHaSSXNs7IMYT7joJrQJKM/s1200/55.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjvKldDi2YRsYeuaTfi4fAsl9TyNdg29jLgqkjSyNmhQPkNth-ktVKMsZsTAZ7MeJTo9udTcWV9aw4Lnn0XawrkUA-YdtNA3gFsB1B1AmWcMEVO-xle-uXLQtCH3hwCbaEs_zSRn488NCOXh5ngSqcHWD66QRep1D3qfREHZeHaSSXNs7IMYT7joJrQJKM/w640-h480/55.jpg" width="640" /></a></div><div style="text-align: justify;">A view with the RPM panel installed again:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2ph1peX84Kxddiof4oimWUWM0wHnvwn7DaYFZnDVNmcRNnZRG4Zm8goWY7iqgEW5sARA3PdCBiIXkDVnFbwlMAy9s-caRd2LIzvuvPwr7K1NStVli4uBsBgPsAum4YWJ8P2lbCByVcpko6mvocdq2ue8g064qsnvViCoH5icxK4geXVbj-iiG_tE2Hko/s1200/56.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2ph1peX84Kxddiof4oimWUWM0wHnvwn7DaYFZnDVNmcRNnZRG4Zm8goWY7iqgEW5sARA3PdCBiIXkDVnFbwlMAy9s-caRd2LIzvuvPwr7K1NStVli4uBsBgPsAum4YWJ8P2lbCByVcpko6mvocdq2ue8g064qsnvViCoH5icxK4geXVbj-iiG_tE2Hko/w640-h480/56.jpg" width="640" /></a></div><div style="text-align: justify;">The last step of this restoration was replacing the glued on rubber bumpers that 'replaced' two missing original ones:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWPK4vTqUinpjkQrhvvyR47IIhx2nLhwqNmCtZzAMxj_F_x_wZ65jhuPDMh7sNmiglBS1G7DJKn7aD6T2WevSBW_Mf2Pq5pWZ2lnwZ3MFqZcAtU-8WeFC8oIbsQ-q6CndBrriONzVIZhPOJAENwQxqqM1NhAOzoSWSEmvCZfo_Ab7bz4JSEiC6qQRv5JI/s1200/57.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWPK4vTqUinpjkQrhvvyR47IIhx2nLhwqNmCtZzAMxj_F_x_wZ65jhuPDMh7sNmiglBS1G7DJKn7aD6T2WevSBW_Mf2Pq5pWZ2lnwZ3MFqZcAtU-8WeFC8oIbsQ-q6CndBrriONzVIZhPOJAENwQxqqM1NhAOzoSWSEmvCZfo_Ab7bz4JSEiC6qQRv5JI/w640-h480/57.jpg" width="640" /></a></div><div style="text-align: justify;">I had a couple original bumpers in my 'stash', which made it simple:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdPy9sNOMao0IcjAdErAhWLF6GN9a4d6XeL6ElIaUK5x3elaPrQxieDuKUBRZZ7_se268VpJCJj1oRoj9aNtq1b1nr8W_pVZ3C6zB6qYxI5McoOE8YK2PSEkH52cKAM6WBAEyD3w70kqz48EVD1JSoy0hmvDUSVlJGPfxm1NQaEKUM45TE-tL2_NNnZe0/s1200/58.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdPy9sNOMao0IcjAdErAhWLF6GN9a4d6XeL6ElIaUK5x3elaPrQxieDuKUBRZZ7_se268VpJCJj1oRoj9aNtq1b1nr8W_pVZ3C6zB6qYxI5McoOE8YK2PSEkH52cKAM6WBAEyD3w70kqz48EVD1JSoy0hmvDUSVlJGPfxm1NQaEKUM45TE-tL2_NNnZe0/w640-h480/58.jpg" width="640" /></a></div><div style="text-align: justify;">And now it was finally time to give this completely restored Beogram a first spin!</div></div><div style="text-align: justify;">I selected one of my favorite George Duke albums, "Liberated Fantasies" from 1976. It was produced by <a href="https://www.mps-music.com" target="_blank">MPS Records</a>, that made quite a few interesting jazz records in the Black Forest in the 1960s, 70s and 80s. They started recently releasing some of their iconic records on vinyl again. My Liberated Fantasies copy seems to be a 1977 reissue on the Delta Label in the Netherlands (5C-064D-99392).</div><div style="text-align: justify;">Of course this lovely vintage album was cleaned ultrasonically with a <a href="https://www.cleanervinyl.com/proxl.html" target="_blank">CleanerVinyl ProXL</a> setup to restore its original sound. What a lovely combination!:</div><div><div style="text-align: justify;"> </div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgHuOfzJnBrLOOna53p3evqeBkUt-suZdlBeY1Xu7RRv6_zRygMly7Cozv1_GqtTYyRvLTAD803PcQOlKzN9t6E1eXDkdK4AhNhMdYokAdB5Rlr_fh-4rrtZwY7JPeh2v89hgZYC93HYPPG3zeNySJYfxfUhUnKxsJr4p3QoSYVD3hfWtGjlU7y5mVHIgE/s1200/59.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgHuOfzJnBrLOOna53p3evqeBkUt-suZdlBeY1Xu7RRv6_zRygMly7Cozv1_GqtTYyRvLTAD803PcQOlKzN9t6E1eXDkdK4AhNhMdYokAdB5Rlr_fh-4rrtZwY7JPeh2v89hgZYC93HYPPG3zeNySJYfxfUhUnKxsJr4p3QoSYVD3hfWtGjlU7y5mVHIgE/w640-h480/59.jpg" width="640" /></a></div><div style="text-align: justify;">I will now play this Beogram 4002 for a while to make sure it does not have any intermittent issues. And then it will be time to send it back to its owner in Tennessee!</div><p><br /></p></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-61047186311173057802023-12-20T19:00:00.001-05:002023-12-20T19:00:38.475-05:00Beogram 4002 (5513): A New Arrival from Tennessee<p style="text-align: justify;">I recently received a Beogram 4002 (Type 5513) from a customer in Tennessee for a complete functional restoration. The unit arrived safely packaged in a Beolover shipping container. This post discusses the initial condition of the unit.</p><p style="text-align: justify;">This shows it as extracted from the box:</p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOA_vqYlqDit-lqPbqNGL_20r9MoORr5vzl2kC-4t6PfrhjE63FwYMupOntmfZRvfDDIbq8xzhUDmfQ-MQztekZn_eRhyRumIRaKksMqQ4SMo-XuI8o56WyawFMiF7GLOdcidv0kAUhE77AB4mGrJQ2O9wQTy-rNKJPPH5-A9RQkS6bdt1qDE3JEtpI8U/s1200/1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="718" data-original-width="1200" height="382" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOA_vqYlqDit-lqPbqNGL_20r9MoORr5vzl2kC-4t6PfrhjE63FwYMupOntmfZRvfDDIbq8xzhUDmfQ-MQztekZn_eRhyRumIRaKksMqQ4SMo-XuI8o56WyawFMiF7GLOdcidv0kAUhE77AB4mGrJQ2O9wQTy-rNKJPPH5-A9RQkS6bdt1qDE3JEtpI8U/w640-h382/1.jpg" width="640" /></a></div><div style="text-align: justify;">As so often, the hood is pretty scratched and has an area that looks like damage from a harsh chemical. I would recommend to replace the hood with a new one from the Beoparts-shop in Denmark and a new reproduction aluminum strip.</div><div><div style="text-align: justify;">Unfortunately, the hood hinge shows signs of corrosion:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixUcVRxQ3V99eWnd__hYZWmMsDtBqM4ZAeFtM-HWvyZuFfcpq4WciBF6G1tP8c-fypy7WUHBdge1EOetfGwkafoHpiJCyshLr6M17APfbEkb2RMJTKr6hZB1c0P1Rv40GSmhDC0R2vbQGbEPnB6IQV8vJcvrKJCiOW9No86ip72jdqtQcW_qPAv2Vm2pI/s1200/2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixUcVRxQ3V99eWnd__hYZWmMsDtBqM4ZAeFtM-HWvyZuFfcpq4WciBF6G1tP8c-fypy7WUHBdge1EOetfGwkafoHpiJCyshLr6M17APfbEkb2RMJTKr6hZB1c0P1Rv40GSmhDC0R2vbQGbEPnB6IQV8vJcvrKJCiOW9No86ip72jdqtQcW_qPAv2Vm2pI/w640-h480/2.jpg" width="640" /></a></div><div style="text-align: justify;">It will not take long until the paint comes off in these areas and then the aluminum will show.</div></div><div style="text-align: justify;">I removed the hood and had a look at the cosmetic condition:</div><div><div style="text-align: justify;"><br /></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgM4lKR7jgRnqzSHQNV6auK7wflgQ-kBB1c_BUta3t3nF9-nud4jY9hx5koJaKOIqiZUriffcNVYwmPSJHN7uUXryfQW3ScRqtSI_OPTzEct_I4j4BPvo_lU1xIozLmrFkY7F5Ha0uZ_tJKLVBnjs6IScpuisjf2Dhfn1s7NeIKG3nnM-8SFdE-5DXwrws/s1200/3.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgM4lKR7jgRnqzSHQNV6auK7wflgQ-kBB1c_BUta3t3nF9-nud4jY9hx5koJaKOIqiZUriffcNVYwmPSJHN7uUXryfQW3ScRqtSI_OPTzEct_I4j4BPvo_lU1xIozLmrFkY7F5Ha0uZ_tJKLVBnjs6IScpuisjf2Dhfn1s7NeIKG3nnM-8SFdE-5DXwrws/w640-h480/3.jpg" width="640" /></a></div><div style="text-align: justify;">The aluminum surfaces are pretty good without major damages. The keypad is also still fairly pristine and has only very faint finger smudges that need the light to come from a specific direction to be visible:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDCG-F8NIoB10aWUHYPP3EGmfHuqhLxi5In8ZdShDBAJruBITRMz3RnMlvbCJvy1y1eN6pRdzzfIFTgiUWXESPkBZvhKpauTktxlCJ5Bc5PGvNRJva5iQWux0qFdB7FK8mC2d0Xc1ft9lXtOB7CHOhrfNpUSqM6MMEeqZ3Jh47fCN0dm_SO4lLTJ26gtc/s1200/4.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDCG-F8NIoB10aWUHYPP3EGmfHuqhLxi5In8ZdShDBAJruBITRMz3RnMlvbCJvy1y1eN6pRdzzfIFTgiUWXESPkBZvhKpauTktxlCJ5Bc5PGvNRJva5iQWux0qFdB7FK8mC2d0Xc1ft9lXtOB7CHOhrfNpUSqM6MMEeqZ3Jh47fCN0dm_SO4lLTJ26gtc/w640-h480/4.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">A perfect candidate for the installation of a <a href="https://beolover.blogspot.com/p/beogram-4002-remote-control.html" target="_blank">Beolover Commander remote control system</a>, which allows using the deck entirely without touching the keypad. The acids in the skin cause the coating of the keys to deteriorate, i.e. it is best to not use these keypads anymore if they are still on a decent condition. The alternative is using a soft cloth to press the keys.</div><div style="text-align: justify;">The plinth is also still pretty nice. It only has minor damages on the corner bottoms:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeWSSL_WzTdgfBtuV8dLir9A3-8Qz8xxgTknz2uSh28BUHoT_tzj2C3OhdO-tuwmYOFjkjp-ucGlGQA06tpYyFVu_h523jzBQzIYc9JAgp6xBoVW_r2YE9AaVKowV26RtE6unWJMDmY70c2ba_QTvvNg0D8bM-RYYIQfMwFZA1JEetR7atuIBLogVdxdE/s1200/5.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjeWSSL_WzTdgfBtuV8dLir9A3-8Qz8xxgTknz2uSh28BUHoT_tzj2C3OhdO-tuwmYOFjkjp-ucGlGQA06tpYyFVu_h523jzBQzIYc9JAgp6xBoVW_r2YE9AaVKowV26RtE6unWJMDmY70c2ba_QTvvNg0D8bM-RYYIQfMwFZA1JEetR7atuIBLogVdxdE/w640-h480/5.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhhv7kJ1BounLX_T5o4RFLUyGRYGtW_M_Wyk8r0OKGD5G0t-iiQP-ZnZB4yB70YqssW3iGh-EB7INmg8G5i5mWZJL8qeK80tlxRhlGRZjAcfsgIrGU8DRaNHL9wydFx4XxfwxFjQONOSWtbrJyvFDIfDUjz3KLD7Fmxcf8sa9vlfzt3LsKaG8IFNn_7meM/s1200/6.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhhv7kJ1BounLX_T5o4RFLUyGRYGtW_M_Wyk8r0OKGD5G0t-iiQP-ZnZB4yB70YqssW3iGh-EB7INmg8G5i5mWZJL8qeK80tlxRhlGRZjAcfsgIrGU8DRaNHL9wydFx4XxfwxFjQONOSWtbrJyvFDIfDUjz3KLD7Fmxcf8sa9vlfzt3LsKaG8IFNn_7meM/w640-h480/6.jpg" width="640" /></a></div><div style="text-align: justify;">This can be camouflaged with a bit of crayon of appropriate color.</div></div><div><div style="text-align: justify;">Two of the plastic feet of the enclosure are missing and have been 'replaced' by glueing rubber bumpers to the enclosure bottom:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6-yOzuopXrhXYYfARN9OSAoNJotiVDHVnigRiKYFCmvBXG7h-dvjIgzgOPkGwpFbpAwyRAMB3XeDCg_s0VCxnPhqGKrn7W9hQxK5N4kMDEm8YxGD7HQGL652aY5jvfDJ1P7AyWcDlzO1DC7Vg3g952auXyFVwzkV9Mlbp0XZ1-NBUBaWHxAXK0xtT04o/s1200/7.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6-yOzuopXrhXYYfARN9OSAoNJotiVDHVnigRiKYFCmvBXG7h-dvjIgzgOPkGwpFbpAwyRAMB3XeDCg_s0VCxnPhqGKrn7W9hQxK5N4kMDEm8YxGD7HQGL652aY5jvfDJ1P7AyWcDlzO1DC7Vg3g952auXyFVwzkV9Mlbp0XZ1-NBUBaWHxAXK0xtT04o/w640-h480/7.jpg" width="640" /></a></div><div style="text-align: justify;">I hope I can remove those without too much damage to the paint and replace them with proper rubber feet.</div></div><div><div style="text-align: justify;">After this visual inspection, I removed the aluminum panels and had a look below deck:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgM9ZndErFxYczVClhgKkKFkH0Mj9ZQrDN8MAfr8vijbQitHqHv1dAJLR1DsLNTo9mkFxWtPwT7o10hyphenhyphenpMbN9IZOAIG6c5uno4eLZEgen6L35SdUS9aVCFRCwsgDe6D7JTSzQlZRGOgcQaXSQh2E3nnLFnQ_sD-2-hExNXkhl4i5sYSLm5l9vtctecjJk8/s1200/8.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgM9ZndErFxYczVClhgKkKFkH0Mj9ZQrDN8MAfr8vijbQitHqHv1dAJLR1DsLNTo9mkFxWtPwT7o10hyphenhyphenpMbN9IZOAIG6c5uno4eLZEgen6L35SdUS9aVCFRCwsgDe6D7JTSzQlZRGOgcQaXSQh2E3nnLFnQ_sD-2-hExNXkhl4i5sYSLm5l9vtctecjJk8/w640-h480/8.jpg" width="640" /></a></div><div style="text-align: justify;">The unit looks original as far as I can tell at this point. Original is always the best starting point for a restoration. As usual with this vintage 4002 the orange transport lock bushings show already first signs of deterioration:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgpOer0ImDcsrOJFpotqrThFsCdmNab0Sl4nCIeUKmLdMuq3qouKwbkxWMefKHEiLyCsoTbiUvyc3rYaet-mRMNtAMGUnARc6Kg8mTx7KkJfVVis87fW2lQ03cCsYGfpmmJL5rQ7_w7o3D0kdObcmo2UnXi7Ubcn2AesRFCkup1RMWBRcP4cCG1B2qeju8/s1200/9.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="899" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgpOer0ImDcsrOJFpotqrThFsCdmNab0Sl4nCIeUKmLdMuq3qouKwbkxWMefKHEiLyCsoTbiUvyc3rYaet-mRMNtAMGUnARc6Kg8mTx7KkJfVVis87fW2lQ03cCsYGfpmmJL5rQ7_w7o3D0kdObcmo2UnXi7Ubcn2AesRFCkup1RMWBRcP4cCG1B2qeju8/w640-h480/9.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">I finally plugged the unit in and hit START. The carriage started moving sluggishly towards the LP setdown point and found it and the solenoid engaged. The platter motor was also running, all good signs.</div><div class="separator" style="clear: both; text-align: justify;">I think this will be a pretty straight forward restoration. Stay tuned for the next post that will discuss the work that was done.</div><div style="text-align: justify;"><br /></div><p><br /></p></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-27906323371581672002023-12-13T14:26:00.001-05:002023-12-13T14:26:17.410-05:00Beogram 4004 (5526): Complete Functional Restoration and a Test Spin with Art Farmer<div style="text-align: justify;">This post discusses the restoration of a Beogram 4004 (Type 5526) that I recently received from a customer in California. The initial assessment of this deck is posted <a href="https://beolover.blogspot.com/2023/11/beogram-4004-first-assessment.html" target="_blank">here</a>.</div><div><div style="text-align: justify;">This shows the Beogram in 'service position' with the aluminum panels removed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXSm3fktW1FbYaiZPlyauUUvMiLNDX37z4exm2FfABYy072tw0H_eyIjCR0FiwWuwqUeZcTHA0VSREc7SlO0bjk4OxqGDpZhhebFtwcoKrI2I7TQLlwuRnNKYnwQtjjmVfq17sb9YaBk5xTY0-tcorwQLKe_Daj7ebIsVDpkagGsQVmeIC-0V5SreXygY/s1200/1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="665" data-original-width="1200" height="354" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhXSm3fktW1FbYaiZPlyauUUvMiLNDX37z4exm2FfABYy072tw0H_eyIjCR0FiwWuwqUeZcTHA0VSREc7SlO0bjk4OxqGDpZhhebFtwcoKrI2I7TQLlwuRnNKYnwQtjjmVfq17sb9YaBk5xTY0-tcorwQLKe_Daj7ebIsVDpkagGsQVmeIC-0V5SreXygY/w640-h354/1.jpg" width="640" /></a></div><div style="text-align: justify;">This 4004 is in pretty good cosmetic condition and below deck it was in original condition, too, always the best starting point for a restoration.</div></div><div><div style="text-align: justify;">As usual with a DC platter motor Beogram, I started with the motor since the oil-infusion of the bearings takes several days. This shows the motor as extracted:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiefqXnx7WaqN7GAuSkeAkN5qp5uJqrpbiVI2SX8n2-AYkOO5t_6Eauc6-xMsfRrr8Tsg3G8Lbzl8e8skVHo-Q2CV0D43g9Wmh4Tg1Syf7y_Q15JMLh-MYHCGqKmwpoa3zh6jJotkVgkEsHMx-TO7lX14OUh5wiHBzvwZYYKbqk__ZeKFJujEL_myqXwHE/s1200/2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiefqXnx7WaqN7GAuSkeAkN5qp5uJqrpbiVI2SX8n2-AYkOO5t_6Eauc6-xMsfRrr8Tsg3G8Lbzl8e8skVHo-Q2CV0D43g9Wmh4Tg1Syf7y_Q15JMLh-MYHCGqKmwpoa3zh6jJotkVgkEsHMx-TO7lX14OUh5wiHBzvwZYYKbqk__ZeKFJujEL_myqXwHE/w640-h480/2.jpg" width="640" /></a></div><div style="text-align: justify;">I took it apart to get to the bearings:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiS87jMkHkEoO-HwUNs7xXgT-w8raH8MalvNMthbF7maGlIw5FdedvnCmNHIJwNh6HrqKDVCjMlLDFcSapNz3_SeoJC6zpgxJ9p_dh2Icwel2MKNGUYsravRGdCKkBkf0puwN6OnFbqflZiLCqLpKsNDTeuyAytcYHXvZNg7Z5FWp7ls8wLX39P_kfjNDE/s1200/3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiS87jMkHkEoO-HwUNs7xXgT-w8raH8MalvNMthbF7maGlIw5FdedvnCmNHIJwNh6HrqKDVCjMlLDFcSapNz3_SeoJC6zpgxJ9p_dh2Icwel2MKNGUYsravRGdCKkBkf0puwN6OnFbqflZiLCqLpKsNDTeuyAytcYHXvZNg7Z5FWp7ls8wLX39P_kfjNDE/w640-h480/3.jpg" width="640" /></a></div><div style="text-align: justify;">They are the two small donuts on the black pad up front. I immersed them in motor oil and pulled a vacuum. Immediately strong bubbling started:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2QXfQn1sK9d6ECeBpM0CbGmLVrWRxxHYGIGpmSKtqWxoGBznVLamEixFmki7J9raMNlyQABm44_toiPPNl63p8IUMEhT6aYw6idmDpiTE8GXW3FNdCsFOmFkevpEofwDseIA0-hTgw4pustQGILIMlYh-6-io79rVBIpkPYmsBAg65sK4kudlI6J6arU/s1200/4.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2QXfQn1sK9d6ECeBpM0CbGmLVrWRxxHYGIGpmSKtqWxoGBznVLamEixFmki7J9raMNlyQABm44_toiPPNl63p8IUMEhT6aYw6idmDpiTE8GXW3FNdCsFOmFkevpEofwDseIA0-hTgw4pustQGILIMlYh-6-io79rVBIpkPYmsBAg65sK4kudlI6J6arU/w640-h480/4.jpg" width="640" /></a></div><div style="text-align: justify;">The bubbling represents air that is drawn from the bearing by the vacuum. While the air leaves the pores of the Oilite bearing material, oil refills the pores. This oil serves as lubricant for the shaft, and is continuously drawn from the bearing material as the shaft rotates. Eventually the bearing is 'empty' and needs to be refilled.</div></div><div style="text-align: justify;">While the oil diffusion took its course I focused on the other tasks of the restoration. </div><div><div style="text-align: justify;">First I rebuilt the carriage. The arm lowering and carriage transport mechanisms usually need a good cleaning from hardened old lubricants, and subsequent re-lubrication with modern synthetic lubricants. This shows the arm lowering mechanism in place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9avkmJeMeCeN8InvnuXyu_HPcK1kLHX3NeujadgpS9wh2rKPlZ87TpL0MJDPV64zwk92H6mcbGcQA3EU6KAW7eC0iq2oEWPXYUgznY8AroMoiSZlKtJyyCGKxYwI6bwqX8DXy5Nfxw2j12hKc3aIGjrADZ-9UT5-OAzEyFj8NEkHZM-WbzTGEtBlmVdE/s1200/5.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9avkmJeMeCeN8InvnuXyu_HPcK1kLHX3NeujadgpS9wh2rKPlZ87TpL0MJDPV64zwk92H6mcbGcQA3EU6KAW7eC0iq2oEWPXYUgznY8AroMoiSZlKtJyyCGKxYwI6bwqX8DXy5Nfxw2j12hKc3aIGjrADZ-9UT5-OAzEyFj8NEkHZM-WbzTGEtBlmVdE/w640-h480/5.jpg" width="640" /></a></div><div style="text-align: justify;">I removed all the moving parts:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEioBkwKnX2ohlZmZ-mFcMn0iRP0mmIryGgzkUhUNUZKTbGgZ9zA7G77hfoLNeoRreGcknpAM8F8A4hIP3Bc2fJUPOpK-hPhbq3uPD_V_lWFJD9oVi2E1gz2ITJQaXNMpDSCSNBhsx43oO9b_tnWypySmt-fifnloZfGbxmbkkRpTppI6F2bASpBN7OJnE4/s1200/6.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEioBkwKnX2ohlZmZ-mFcMn0iRP0mmIryGgzkUhUNUZKTbGgZ9zA7G77hfoLNeoRreGcknpAM8F8A4hIP3Bc2fJUPOpK-hPhbq3uPD_V_lWFJD9oVi2E1gz2ITJQaXNMpDSCSNBhsx43oO9b_tnWypySmt-fifnloZfGbxmbkkRpTppI6F2bASpBN7OJnE4/w640-h480/6.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXD4zmAj_MZ-3p76rdy3npxVck7lDemjY7E8mNShVN7JvySLV7_YtjEm_DJH4JeBB7lr3oJOq4sr9KrqOMUgv9Nurar6Rnvo_HTDZiL3ZK4C6FCVdA08cyImxnyF-YaCsfZBPFNbKTm1iq3gCtFsq3FvIW7LMOTSA36RBabxgOPsoH4oat0PdaBswWyDw/s1200/7.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXD4zmAj_MZ-3p76rdy3npxVck7lDemjY7E8mNShVN7JvySLV7_YtjEm_DJH4JeBB7lr3oJOq4sr9KrqOMUgv9Nurar6Rnvo_HTDZiL3ZK4C6FCVdA08cyImxnyF-YaCsfZBPFNbKTm1iq3gCtFsq3FvIW7LMOTSA36RBabxgOPsoH4oat0PdaBswWyDw/w640-h480/7.jpg" width="640" /></a></div><div style="text-align: justify;">and cleaned them in an ultrasonic cleaner:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitbxiWTdtCOLoDT2zkQt_KIEacoMBtP05c9ubHnh-HGeozIS2gHrefBrzDCDn17mfY7ZidNDAKVGGqdKENY55OCUO2mIiyZ7l0VR9fyk3xxkZdwH3gEZ1psaXF2TDqAnGINEJ990mHhDdFkilr7sASJ1N4FHWJjcLCKXwEPN_bWNlWvdC8eiezCRanBlA/s1200/8.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitbxiWTdtCOLoDT2zkQt_KIEacoMBtP05c9ubHnh-HGeozIS2gHrefBrzDCDn17mfY7ZidNDAKVGGqdKENY55OCUO2mIiyZ7l0VR9fyk3xxkZdwH3gEZ1psaXF2TDqAnGINEJ990mHhDdFkilr7sASJ1N4FHWJjcLCKXwEPN_bWNlWvdC8eiezCRanBlA/w640-h480/8.jpg" width="640" /></a></div><div style="text-align: justify;">Nice and shiny again! Beolovely! The next step was re-assembly. As usual, I put a new rubber gasket into the damper:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigvrWVESl1SE2YMAKY0sB-NtlJZYThAAuH4XO6XJw6RlVtRk9vroirkUCjnvAZXiRku_6AEqnx0j7Nc7gMIPg302upNjCbSjdaJgvXBEOxmpB9_kMxR36_gFo6OGmW0ZPzD_IIp7XzjA1lHEMkbsSPTopPCYHTKXTh-VCRKUu6KuPvBZX1FQIP8lwWVUE/s1200/9.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigvrWVESl1SE2YMAKY0sB-NtlJZYThAAuH4XO6XJw6RlVtRk9vroirkUCjnvAZXiRku_6AEqnx0j7Nc7gMIPg302upNjCbSjdaJgvXBEOxmpB9_kMxR36_gFo6OGmW0ZPzD_IIp7XzjA1lHEMkbsSPTopPCYHTKXTh-VCRKUu6KuPvBZX1FQIP8lwWVUE/w640-h480/9.jpg" width="640" /></a></div><div style="text-align: justify;">This is important to ensure a consistent arm lowering experience. The old original rubber rings are usually hardened and this can cause sudden changes in the arm lowering speed. This shows everything back in place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhiRVh9ni-IwEj1Uov094YrbY_gutNxDGuN3UtumT2DuLvPuPX3-MDGItUdKewMZAlHrvTpRlMGAXO_bXYRkJkTneEF7Az4365zzuuw2bcnZG5GtO_UpbCUqp7-_MWXC3k0JUjuR-yv7XYBBIP86tW0BVtZg_uelSkdFa4LqzOrYV9ADRXNyDvdp-FCkg/s1200/10.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhiRVh9ni-IwEj1Uov094YrbY_gutNxDGuN3UtumT2DuLvPuPX3-MDGItUdKewMZAlHrvTpRlMGAXO_bXYRkJkTneEF7Az4365zzuuw2bcnZG5GtO_UpbCUqp7-_MWXC3k0JUjuR-yv7XYBBIP86tW0BVtZg_uelSkdFa4LqzOrYV9ADRXNyDvdp-FCkg/w640-h480/10.jpg" width="640" /></a></div><div style="text-align: justify;">I also installed a new machined aluminum carriage pulley. The original one was cracked at the set screw: </div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEix07CyaJobiCUqHThyphenhyphenbIhaViPo0nVX3QQwaPaj7gcQG6tukgzkpZrEsoTS16UmCcXm6pgMkl9AZP7wWa2PwhyXZomhAwKllPdSnvj3zkAvU5cR6uCFBU2w-nqtK7r6fjfNnO-H4BlaV0vqfoAHMir644_fnlVUYWZHiy4qjchMgO-E8i3yzdk9E8LZOfA/s1200/11.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEix07CyaJobiCUqHThyphenhyphenbIhaViPo0nVX3QQwaPaj7gcQG6tukgzkpZrEsoTS16UmCcXm6pgMkl9AZP7wWa2PwhyXZomhAwKllPdSnvj3zkAvU5cR6uCFBU2w-nqtK7r6fjfNnO-H4BlaV0vqfoAHMir644_fnlVUYWZHiy4qjchMgO-E8i3yzdk9E8LZOfA/w640-h480/11.jpg" width="640" /></a></div><div style="text-align: justify;">There is one more moving part in the arm lowering assembly that needs to be cleaned and lubricated: The connecting linkage between damper and tonearm. It has its pivot point located on the sensor arm base. You can see the linkage here. It is the part that sticks out from the V-cut on the connector that is bolted to the end of the arm weight assembly:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgHCupCfnr95jOnt_OTqV7TljmmdoDU3DELKu4HqG1ARrCUL2J9kLIsvvHEgJhVHYziMykkRocdfMfx26QGwCsADFuJD9lRnqRQ5v8THABtK37AdSvDNXeW7b6OlK0yPQjy-8iBIQUUKCwht6AER_ESI4OJiwfAfY6qUuhh2pDYiZt1moYtRRYjt8JwMu8/s1200/12.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgHCupCfnr95jOnt_OTqV7TljmmdoDU3DELKu4HqG1ARrCUL2J9kLIsvvHEgJhVHYziMykkRocdfMfx26QGwCsADFuJD9lRnqRQ5v8THABtK37AdSvDNXeW7b6OlK0yPQjy-8iBIQUUKCwht6AER_ESI4OJiwfAfY6qUuhh2pDYiZt1moYtRRYjt8JwMu8/w640-h480/12.jpg" width="640" /></a></div><div style="text-align: justify;">To get to the linkage the sensor arm needs to be removed. This shows it with the linkage already removed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjjsyaSqafTvD6Xu-vSTor64G7Rv2SBcuB8eyYLLcZfX2_v6-WLEG-ivVoDt8jWvpwm7FvpZbC4_QdrzGiRVPwVHjItx3RMUM_so-BOtnNNXDs4lgg0oEgM4qlODmVyGjfeZ9Fm4R_EfTGd1nTl9d4iiT75D2pmH-hFHQWQ2tkAGVFIQS88TTDUDYGAPSE/s1200/13.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjjsyaSqafTvD6Xu-vSTor64G7Rv2SBcuB8eyYLLcZfX2_v6-WLEG-ivVoDt8jWvpwm7FvpZbC4_QdrzGiRVPwVHjItx3RMUM_so-BOtnNNXDs4lgg0oEgM4qlODmVyGjfeZ9Fm4R_EfTGd1nTl9d4iiT75D2pmH-hFHQWQ2tkAGVFIQS88TTDUDYGAPSE/w640-h480/13.jpg" width="640" /></a></div><div style="text-align: justify;">As in most cases the small copper plate that helps the arm move laterally when in up position also was loose. A light tug with my tweezers removed it. I epoxied it back into place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi62CenLtJEJZOBqDC0Id8BR85K3PTwtq2AsxJtqgJMDEfrvARVdJLQEtIfGOFrJ_HwL6LGJEMExYQd5HtzRlD9p9VcchGk70HCMZn-YMBcZLnYvdIV6lxcK7DiC77bOHVQl90jcnoM7AbwweOiCVf0-6ZGW2fQJ0toeaCiIZOQZITRE0S4K15d1ORuHTY/s1200/14.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi62CenLtJEJZOBqDC0Id8BR85K3PTwtq2AsxJtqgJMDEfrvARVdJLQEtIfGOFrJ_HwL6LGJEMExYQd5HtzRlD9p9VcchGk70HCMZn-YMBcZLnYvdIV6lxcK7DiC77bOHVQl90jcnoM7AbwweOiCVf0-6ZGW2fQJ0toeaCiIZOQZITRE0S4K15d1ORuHTY/w640-h480/14.jpg" width="640" /></a></div><div style="text-align: justify;">After bolting the sensor arm back in place I started working on the circuit boards. The main PCB was first. This board has two power transistors mounted on the solder side. This shows one of them, IC4, a Darlington. Originally IC4 is usually a TIP125: </div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgVLdzdkl3QozoGrpOvu_OWwlbcfPBQekbPWmsRH6yoSkF5SM-UYgfLQXcswLZZBPgpxNj6PIcVJupoLLpmWTJ3FpIH0eJOFs8kxCLyBge-kwWzQZobMwIJJZsN27Or5KPnbgtf061ckXxnoMuPApw6okSqZObpgenNmj35b7Cl2WrPkE6zDDEYHQuUsYE/s1200/15.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgVLdzdkl3QozoGrpOvu_OWwlbcfPBQekbPWmsRH6yoSkF5SM-UYgfLQXcswLZZBPgpxNj6PIcVJupoLLpmWTJ3FpIH0eJOFs8kxCLyBge-kwWzQZobMwIJJZsN27Or5KPnbgtf061ckXxnoMuPApw6okSqZObpgenNmj35b7Cl2WrPkE6zDDEYHQuUsYE/w640-h480/15.jpg" width="640" /></a></div><div style="text-align: justify;">I normally replace IC4 with a stronger TIP107 type. This IC controls the solenoid and therefore sees some 'action'. So a bit more current capability may help longevity. This shows the new TIP107 in place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjJ0wgvRAqz0eusc6ubKCHy1jrodxjdLs38vlR_Nmng-9GBEcueoPezhTx8x400RZizCdolAkmnLembCASBv50a59WVOXsztkadfBO681nlOxpzpkh2dbi7s1HfRWb1qUo3sPqC3oRQ-7bgyMJ3U-ZBL6-4FfdSdyeSiCEjYiWWKI73UQDqfvmk-6eGX78/s1200/16.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjJ0wgvRAqz0eusc6ubKCHy1jrodxjdLs38vlR_Nmng-9GBEcueoPezhTx8x400RZizCdolAkmnLembCASBv50a59WVOXsztkadfBO681nlOxpzpkh2dbi7s1HfRWb1qUo3sPqC3oRQ-7bgyMJ3U-ZBL6-4FfdSdyeSiCEjYiWWKI73UQDqfvmk-6eGX78/w640-h480/16.jpg" width="640" /></a></div><div style="text-align: justify;">Once the power transistors have been replaced it is time to remove the board and replace the remaining power transistors, all electrolytic capacitors, the sensor transistor, which often is out of spec, and the RPM relay and trimmers. This shows the board in original condition:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKyfUpu3hAUlPbZd0OE8BJUq37T8tpO_Lrkqj7QpiU_C5_VTHNISbv-dICJgHxIJMh-OZapDKGfxMDjeIjPziym3NEW6UYIvw1ZaZagohAgsi4yg8o5qBQ42TeKuhEEsmRhxaXYatoSl7zF5O2OGvoKaX4QMBromCQNQDJnQorggZ8rAx73eIB0qy5wf8/s1200/17.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="741" data-original-width="1200" height="396" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKyfUpu3hAUlPbZd0OE8BJUq37T8tpO_Lrkqj7QpiU_C5_VTHNISbv-dICJgHxIJMh-OZapDKGfxMDjeIjPziym3NEW6UYIvw1ZaZagohAgsi4yg8o5qBQ42TeKuhEEsmRhxaXYatoSl7zF5O2OGvoKaX4QMBromCQNQDJnQorggZ8rAx73eIB0qy5wf8/w640-h396/17.jpg" width="640" /></a></div><div style="text-align: justify;">Here a close up of the RPM section:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEidBkidGcdvn8mqb2lzSblLCgn47K7Qu1zYYgtxzmSvnvv95d2G53yY-uKfdX8CWLT-_m3h3AHe5uQXPR12HKpoY92OspY7I6UP9hgKyofJ6Iq1sSA1aSYseVXVeDlqvZJRuf49l2iu8ljkY41Rt9Bg1i6HlEe7h7t6Lx63StjA2d8mZrYgi_3uiiWISe8/s1200/18.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEidBkidGcdvn8mqb2lzSblLCgn47K7Qu1zYYgtxzmSvnvv95d2G53yY-uKfdX8CWLT-_m3h3AHe5uQXPR12HKpoY92OspY7I6UP9hgKyofJ6Iq1sSA1aSYseVXVeDlqvZJRuf49l2iu8ljkY41Rt9Bg1i6HlEe7h7t6Lx63StjA2d8mZrYgi_3uiiWISe8/w640-h480/18.jpg" width="640" /></a></div><div style="text-align: justify;">And with exchanged components:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiiuWKrBJw-v5CMXHngcNycucdpyeGT_q1Cp6Q_D9J2FIzg6kaV3MKXIAxac78Y8wHxfCbpwusnKNt6shJWH3n_2z9fhyphenhyphenWVEqsv_Ye_9HhA2B4bJdXnyLBVQa-XYeY_1CGb7rMXdBRMinZRgadlseUkh8J52lwsh0G7OugnRxzUAEAuZYRLTVM7x1tD39Y/s1200/19.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="634" data-original-width="1200" height="338" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiiuWKrBJw-v5CMXHngcNycucdpyeGT_q1Cp6Q_D9J2FIzg6kaV3MKXIAxac78Y8wHxfCbpwusnKNt6shJWH3n_2z9fhyphenhyphenWVEqsv_Ye_9HhA2B4bJdXnyLBVQa-XYeY_1CGb7rMXdBRMinZRgadlseUkh8J52lwsh0G7OugnRxzUAEAuZYRLTVM7x1tD39Y/w640-h338/19.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the RPM section updated with a modern encapsulated relay and new 25-turn trimmers for RPM adjustment:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgV8Hwg_bxpX_I3PpJRHS9H11-P0dXJaFS5HMSVr9I3sUGHXT5OcowNWEX_m2ZG7ZjtvxRA43PbPr6CjMVYwD37EuhTy9292OCHE2lH18MIBTmws6KWxCe-02O7j0tYTJLFbYzXod1SYv2yCDADokdDmPfjZqT53XEJXlKtIZm0l5MUNMdK6Ct8V1uHlks/s1200/20.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgV8Hwg_bxpX_I3PpJRHS9H11-P0dXJaFS5HMSVr9I3sUGHXT5OcowNWEX_m2ZG7ZjtvxRA43PbPr6CjMVYwD37EuhTy9292OCHE2lH18MIBTmws6KWxCe-02O7j0tYTJLFbYzXod1SYv2yCDADokdDmPfjZqT53XEJXlKtIZm0l5MUNMdK6Ct8V1uHlks/w640-h480/20.jpg" width="640" /></a></div><div style="text-align: justify;">After completing the main PCB, I did the output PCB, which in the 4004 also contains circuitry that enables remote control of the deck via a Beomaster 2400. This shows the board in its original condition:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZHoVyvg-yBl7XMYMO4AAp-5UWbqMYDtIlG_vzbjVFS4m9IGfa11gvCGH9wShPicBOFxl9vSer0fqn5X-QnAAcHfchMmiM5E669hUPdCLuPSmJ-NWkwUUFReki7_doahruAzN3M2WAb5u9-Y9bcblFCZKHC6_3ZbyA-cuD2iHdltSZy1gnJN2qYyHYI5s/s1200/21.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZHoVyvg-yBl7XMYMO4AAp-5UWbqMYDtIlG_vzbjVFS4m9IGfa11gvCGH9wShPicBOFxl9vSer0fqn5X-QnAAcHfchMmiM5E669hUPdCLuPSmJ-NWkwUUFReki7_doahruAzN3M2WAb5u9-Y9bcblFCZKHC6_3ZbyA-cuD2iHdltSZy1gnJN2qYyHYI5s/w640-h480/21.jpg" width="640" /></a></div><div style="text-align: justify;">This is a close up of the output section consisting of the output relay and the small circuit that controls the relay delay after the arm has been lowered:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhptBJgyHRhIDDNLTurDm4HG4I7-MM3VoW6etBTMIZYHx9Mr0_7-oUp8XQL2NJNzjPeZpKAsg85jSCAuHEY0vLchFUtmnT1vqFDPWpA4a-_f8d3Ii7KBAZ7ZRbyiGm0CsvcpI5VPMJJHGMRMqLIU-shDX6Z2tKBUfSH6rpduxktFsJ5F090WRfebWuL7as/s1200/22.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhptBJgyHRhIDDNLTurDm4HG4I7-MM3VoW6etBTMIZYHx9Mr0_7-oUp8XQL2NJNzjPeZpKAsg85jSCAuHEY0vLchFUtmnT1vqFDPWpA4a-_f8d3Ii7KBAZ7ZRbyiGm0CsvcpI5VPMJJHGMRMqLIU-shDX6Z2tKBUfSH6rpduxktFsJ5F090WRfebWuL7as/w640-h480/22.jpg" width="640" /></a></div><div style="text-align: justify;">I replaced all the electrolytic capacitors and the relay:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6jdKD7PjVnYC7hIZbg6rtyJSdhDdn2GGLwoUUWqL8s3Anw0EL19Z51nMzBTpDFUUg5hcpYq5pD9y-PbM_Epihul7sRkBjGxJXHIN8uuNw64V9ziYEDmUnWMOgA0WoPDT2yNsrYa_q0V4rnR9PPiSdBKYu-82ZmzKVpWrt9sdhELy6pFwDcuYNPrkckT8/s1200/23.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6jdKD7PjVnYC7hIZbg6rtyJSdhDdn2GGLwoUUWqL8s3Anw0EL19Z51nMzBTpDFUUg5hcpYq5pD9y-PbM_Epihul7sRkBjGxJXHIN8uuNw64V9ziYEDmUnWMOgA0WoPDT2yNsrYa_q0V4rnR9PPiSdBKYu-82ZmzKVpWrt9sdhELy6pFwDcuYNPrkckT8/w640-h480/23.jpg" width="640" /></a></div><div style="text-align: justify;">I also installed a switch (red) that allows connecting system and signal grounds:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixjkoqzFi1OfvF6_uADrEPmUmjEGUqlL8iASXtMkhNBgNzj2oRw9TbtpwjC5FMEycIl2rnJUXpYjceIqeesYH6FFlKX50HukfIeWiWh1JaO9BZsAWdXZM0jpFFjtlX7QHeOSddLNx-5fK5x7jLMxc8wyuTdM5K60na-q8AZYAC_Xnzdat2uUA9m4_DA28/s1200/24.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixjkoqzFi1OfvF6_uADrEPmUmjEGUqlL8iASXtMkhNBgNzj2oRw9TbtpwjC5FMEycIl2rnJUXpYjceIqeesYH6FFlKX50HukfIeWiWh1JaO9BZsAWdXZM0jpFFjtlX7QHeOSddLNx-5fK5x7jLMxc8wyuTdM5K60na-q8AZYAC_Xnzdat2uUA9m4_DA28/w640-h480/24.jpg" width="640" /></a></div><div style="text-align: justify;">Connecting signal and system grounds often quenches hum issues, especially if a Beogram is used with an RCA input amplifier.</div></div><div><div style="text-align: justify;">Now it was time to replace the four incandescent light bulbs in the deck. Two of them are in the RPM adjustment panel above the keypad. This shows the panel removed with the two bulb covers removed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEic8sDTRkJLNnt0VjTIQR7LmkeXeKD5V2womA1cUkL9lh_crriM3jeXh2RDfASUMReR21-TkZeLfno8hJXFXOTPRoDyGqE-7s3jyvcr5KvWgv2KiWxesr0ezGZwsJFxEwOCaYwSVaZE_DtoCAAoHXXMkK7xUteJge616vhMOHUUh5FGeEkqtHkui72wePE/s1200/25.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEic8sDTRkJLNnt0VjTIQR7LmkeXeKD5V2womA1cUkL9lh_crriM3jeXh2RDfASUMReR21-TkZeLfno8hJXFXOTPRoDyGqE-7s3jyvcr5KvWgv2KiWxesr0ezGZwsJFxEwOCaYwSVaZE_DtoCAAoHXXMkK7xUteJge616vhMOHUUh5FGeEkqtHkui72wePE/w640-h480/25.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the removed bulbs together with the Beolover LED assemblies which will replace the bulbs:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIj5LPwPUy3ekYxfLxawWU51oTshKOhNrA3fT-mYfLMss7kJzf4_clA_nP0ZLnSv5_37q_d7jIiWd2jWy3mqq1aK6HCSep6uyQVyOvJC-q6rWu3nHRSyCWhZs304R_gVgBrLTwtfHU_4dswdM6w5vSKQAqPdTMJZyC-xNyXXrWSnGfejxoMZOP3Qypvac/s1200/26.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIj5LPwPUy3ekYxfLxawWU51oTshKOhNrA3fT-mYfLMss7kJzf4_clA_nP0ZLnSv5_37q_d7jIiWd2jWy3mqq1aK6HCSep6uyQVyOvJC-q6rWu3nHRSyCWhZs304R_gVgBrLTwtfHU_4dswdM6w5vSKQAqPdTMJZyC-xNyXXrWSnGfejxoMZOP3Qypvac/w640-h480/26.jpg" width="640" /></a></div><div style="text-align: justify;">I soldered the LED boards into place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg2mdM852wGvw1RkZyiJ_AhYbFJMyYUdeKSNTxzld7Ln3zguvSD2M0eHvnbTE0cw7zsmeimgZV_FiQLrT4wjWH0P8wKIFtiWv_iThKBj_G1VOFc5edGFgumAEASVkmkxe4wSfx49Ks_bAIua4AEYybPA6oFRPLBqXV1f7EdQ8I362Su_vfviQ4Xj4z_Aes/s1200/27.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg2mdM852wGvw1RkZyiJ_AhYbFJMyYUdeKSNTxzld7Ln3zguvSD2M0eHvnbTE0cw7zsmeimgZV_FiQLrT4wjWH0P8wKIFtiWv_iThKBj_G1VOFc5edGFgumAEASVkmkxe4wSfx49Ks_bAIua4AEYybPA6oFRPLBqXV1f7EdQ8I362Su_vfviQ4Xj4z_Aes/w640-h480/27.jpg" width="640" /></a></div><div style="text-align: justify;">They solder directly to the bulb terminals:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiHjBWBxnDI_LLD74Vfwn2hf76lXuj9nOeTTBhxbGMBp_Ijc5vIDI5uDI8ptNwEu8qmizIb8sI7RYSanbkYhJGv5sUL77wA7oys12CFBgyHc5AOmwNFViTU0_OKmTqGcnxpWJyYGKYygfWR_Sn6ilkQfeN63B8NtGhDw6W7tdwWe0yt31WBqMbXZZA54EM/s1200/28.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiHjBWBxnDI_LLD74Vfwn2hf76lXuj9nOeTTBhxbGMBp_Ijc5vIDI5uDI8ptNwEu8qmizIb8sI7RYSanbkYhJGv5sUL77wA7oys12CFBgyHc5AOmwNFViTU0_OKmTqGcnxpWJyYGKYygfWR_Sn6ilkQfeN63B8NtGhDw6W7tdwWe0yt31WBqMbXZZA54EM/w640-h480/28.jpg" width="640" /></a></div><div style="text-align: justify;">They do not obstruct the bulb covers, which can be put into place after the exchange:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiog-dokXZVTwdWYFTgbLdnilFmhRfHRCTJpKIKRArdMj5A-wCvCq-tALO54X1KoPKP9Tdto5OQmVCkZwoYG0c3TgYe8ttjDIyMIz7o0DK6wNoK62hEmBOSNMzbQ4nt3V8Hrei658xvSYAubvk7z1Tg5XBnviYq0LDXuox5ssOoQEKyezmjpt7qH1D2uls/s1200/29.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiog-dokXZVTwdWYFTgbLdnilFmhRfHRCTJpKIKRArdMj5A-wCvCq-tALO54X1KoPKP9Tdto5OQmVCkZwoYG0c3TgYe8ttjDIyMIz7o0DK6wNoK62hEmBOSNMzbQ4nt3V8Hrei658xvSYAubvk7z1Tg5XBnviYq0LDXuox5ssOoQEKyezmjpt7qH1D2uls/w640-h480/29.jpg" width="640" /></a></div><div style="text-align: justify;">The third bulb is in the sensor arm. It serves to illuminate the platter so the absence of a record can be detected from the reflected light 'pattern'. This shows the small sensor compartment pulled out of the sensor arm together with the LED replacement assembly:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhgWBBsbxZFG2W9Iws6qVcEoEZpoMFVqE-AEgJbeIrW1Fyaa7-J3unRIkuKnwCI7IGqdqZWCH4Lj0VfH6Q2_xM8ZIkM1OOewWk2lU73Ooqv7RkdJyXi2qpjNbZZ2YZS6iEKisSHJ0lJ1ucMErFtzyMeFB4c2-KCDembtUtwDIvRB5Pnt63n2fn05MWqZP4/s1200/30.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhgWBBsbxZFG2W9Iws6qVcEoEZpoMFVqE-AEgJbeIrW1Fyaa7-J3unRIkuKnwCI7IGqdqZWCH4Lj0VfH6Q2_xM8ZIkM1OOewWk2lU73Ooqv7RkdJyXi2qpjNbZZ2YZS6iEKisSHJ0lJ1ucMErFtzyMeFB4c2-KCDembtUtwDIvRB5Pnt63n2fn05MWqZP4/w640-h480/30.jpg" width="640" /></a></div><div style="text-align: justify;">I installed the LED board:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZmek0TYcX_n34X0MBPUSsW8cSRLDNZo_93lMf5ZF8I_skUofL25Aj-Q55pLuOjOtGjo-olP_YEZuSg1gGZskRKifJy8l66HBoCvz2bVc2FWIok9c3yFTEkGWhI7BmEWBy7s_aQ_hXFCYShxOWR5fIpKcDYsb26mK53EHDdWuVuD7A1EHfv90F_ca_TC0/s1200/31.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZmek0TYcX_n34X0MBPUSsW8cSRLDNZo_93lMf5ZF8I_skUofL25Aj-Q55pLuOjOtGjo-olP_YEZuSg1gGZskRKifJy8l66HBoCvz2bVc2FWIok9c3yFTEkGWhI7BmEWBy7s_aQ_hXFCYShxOWR5fIpKcDYsb26mK53EHDdWuVuD7A1EHfv90F_ca_TC0/w640-h480/31.jpg" width="640" /></a></div><div style="text-align: justify;">Here you can see the LED in action. It uses a warm white LED which produces enough red photos that the B&O logo is illuminated properly:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQjU0lvQJfAeTPg3FD3lqemjgGeMOuBDDTQ9viKO2CjNCCNOAWvjy3OJJKEzEDXkXe3E3ttJr0SHA8PxAPs7kLtkOprfhn4fkQnOAifvX8Xez8xHHmjRySWbydykx5nLu213-L2H_L6t6srTgAwF842w944FAyusiybtGrcMe-nGtFXMSk4BUlclk3dyE/s1200/32.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQjU0lvQJfAeTPg3FD3lqemjgGeMOuBDDTQ9viKO2CjNCCNOAWvjy3OJJKEzEDXkXe3E3ttJr0SHA8PxAPs7kLtkOprfhn4fkQnOAifvX8Xez8xHHmjRySWbydykx5nLu213-L2H_L6t6srTgAwF842w944FAyusiybtGrcMe-nGtFXMSk4BUlclk3dyE/w640-h480/32.jpg" width="640" /></a></div><div style="text-align: justify;">The final, fourth, LED is in the tracking sensor assembly under the arms. This shows the original setup in place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkECtiimsYTCorDyH4nM0IKwxhHNyPLxlc7mLbb_MxtOSLPaU3zZmcWnMHcvcg7NdRnS01t_aL4ajCQmO69iAvVc1EVef7uFYRyd7cGWaI2MCK5iv5gtIa_76ReJIX7xiFUEsUu8uSQwvn4nDHduqTboBc_C0k_N3B0NKUqcVxfczNwaRYqAoxo3EgiL8/s1200/32a.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkECtiimsYTCorDyH4nM0IKwxhHNyPLxlc7mLbb_MxtOSLPaU3zZmcWnMHcvcg7NdRnS01t_aL4ajCQmO69iAvVc1EVef7uFYRyd7cGWaI2MCK5iv5gtIa_76ReJIX7xiFUEsUu8uSQwvn4nDHduqTboBc_C0k_N3B0NKUqcVxfczNwaRYqAoxo3EgiL8/w640-h480/32a.jpg" width="640" /></a></div><div style="text-align: justify;">I removed the bulb housing, which revealed the aperture that is used for the tracking feedback mechanism:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipD1JdefkzGfdtDLDEGoBp9YFD6E5jmu_52XGx_5AT0U2Ozhgz96mWctt6nAZ45kufraovOQXhlw0GVGQNdXHl2yCj4dUDF2f8z3qD8_ZZEQ3fYSu7ZK0zlxfgiuLcGByjcXjDBSUEi1kwpFJSUFQWiQq0ZPTKXdSMzwQISLGN8f5lBhGxP3xF7TeRxq4/s1200/33.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipD1JdefkzGfdtDLDEGoBp9YFD6E5jmu_52XGx_5AT0U2Ozhgz96mWctt6nAZ45kufraovOQXhlw0GVGQNdXHl2yCj4dUDF2f8z3qD8_ZZEQ3fYSu7ZK0zlxfgiuLcGByjcXjDBSUEi1kwpFJSUFQWiQq0ZPTKXdSMzwQISLGN8f5lBhGxP3xF7TeRxq4/w640-h480/33.jpg" width="640" /></a></div><div style="text-align: justify;">I installed the Beolover tracking sensor LED assembly:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFTxqPRYHB7ROwyoK8ducAmOfyOlBh8hPFhxJ8dpQ2zoUG8t5IjvNn3QcJMPFmNVMt3Dn8c3nMXvHMPnX2TpDjeK2coGD_RoxCvb_Vhd_AKQQf8GALIlOZHggRQkZCY9HRpH1UCnUGjUY67UloG2XibPwWIjiNwjacCUf7io43E9Wo2SlPrtX216ghcjU/s1200/34.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFTxqPRYHB7ROwyoK8ducAmOfyOlBh8hPFhxJ8dpQ2zoUG8t5IjvNn3QcJMPFmNVMt3Dn8c3nMXvHMPnX2TpDjeK2coGD_RoxCvb_Vhd_AKQQf8GALIlOZHggRQkZCY9HRpH1UCnUGjUY67UloG2XibPwWIjiNwjacCUf7io43E9Wo2SlPrtX216ghcjU/w640-h480/34.jpg" width="640" /></a></div><div style="text-align: justify;">The small white box on top is a trimmer that allows adjusting the light intensity of the LED, which can be helpful for fine-tuning the tracking response.</div></div><div><div style="text-align: justify;">With most of the components removed from the enclosure, it was time to focus on the transport lock bushings, which were completely degraded in this 4004. Here you see one of the locks where the bushing was completely gone:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDoyQR59HqxjvC-CoH9TEG67LN8Kzod_SWzZPPgORbTg0K7v-lVeezh4Zlm0qKn_M6-4_7FK0kfgoSb7AUHzDDVaC0DWI7LobzzzPHj-ikFCzXQN8ZawIYUEwZK_4lkKXcGRFhnu_3-DPlWLq7P0MLkIc8gl1l2W3ZC158aOssw0PwImJ6J4FVn42HisM/s1200/35.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiDoyQR59HqxjvC-CoH9TEG67LN8Kzod_SWzZPPgORbTg0K7v-lVeezh4Zlm0qKn_M6-4_7FK0kfgoSb7AUHzDDVaC0DWI7LobzzzPHj-ikFCzXQN8ZawIYUEwZK_4lkKXcGRFhnu_3-DPlWLq7P0MLkIc8gl1l2W3ZC158aOssw0PwImJ6J4FVn42HisM/w640-h480/35.jpg" width="640" /></a></div><div style="text-align: justify;">I removed the floating chassis to clean out the enclosure. When the bushings degrade they create a nice mess with a lot of debris distributed around the enclosure:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjF4_PMhTXIqJVEZTiXT_qQnH7LisHJTcl4nqE6HhHXam8uXwBsu9izEuwEvUkYSaC9bJ9V9kqQlIG56vnV6oPolPbKmtFCc-u2RqE39vPkBtSwj9HNVJ4Z0cIbd_SoTQp1TGVFp4adEdUSBkOAVeS6FEHT1-bA_WfZuWJVGDgZV2q2PNr0B3dlwDgnngY/s1200/38.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjF4_PMhTXIqJVEZTiXT_qQnH7LisHJTcl4nqE6HhHXam8uXwBsu9izEuwEvUkYSaC9bJ9V9kqQlIG56vnV6oPolPbKmtFCc-u2RqE39vPkBtSwj9HNVJ4Z0cIbd_SoTQp1TGVFp4adEdUSBkOAVeS6FEHT1-bA_WfZuWJVGDgZV2q2PNr0B3dlwDgnngY/w640-h480/38.jpg" width="640" /></a></div><div style="text-align: justify;">This can cause impediments for the motion of the floating chassis since there is only limited space under it. I vacuumed all the debris out of the enclosure:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEv1rcLoN-zRXOeJSmmGotQcaNElwh4S9oCtPQKaVzmp3PE9lKZ-QGS0TkBH1kKms8Kst0xu64NovnDiYq3xkwD_QhkeGQMVqM4f-Q0WskLdc4J2R0Nr1osPzTVvRf8NB07D2CHTNEkzXkpapNBJVXVi0E33tAB_UNXSOS6X6myzOuE_LblZtdt0GMZo0/s1200/39.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEv1rcLoN-zRXOeJSmmGotQcaNElwh4S9oCtPQKaVzmp3PE9lKZ-QGS0TkBH1kKms8Kst0xu64NovnDiYq3xkwD_QhkeGQMVqM4f-Q0WskLdc4J2R0Nr1osPzTVvRf8NB07D2CHTNEkzXkpapNBJVXVi0E33tAB_UNXSOS6X6myzOuE_LblZtdt0GMZo0/w640-h480/39.jpg" width="640" /></a></div><div style="text-align: justify;">An then it was time to re-assemble everything. I installed a new reservoir capacitor:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8uWbUs-6L7II8uwTurVuTlgsWMAmjIPfkiXdUgWCtt3FIPO0m3L3e2b-JkhgdYBebCYKYKrwvMJfEHuVD2em1Tw7yw4r17Y1CJDUtGTiNI7xCcYhMMQ_YmvFztJvwPslyGolEHtZxpXNOEQRXcsfn0Mp1aovnZAq98fIYtD03jhfGw7dUIqPFJEB9HMY/s1200/40.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8uWbUs-6L7II8uwTurVuTlgsWMAmjIPfkiXdUgWCtt3FIPO0m3L3e2b-JkhgdYBebCYKYKrwvMJfEHuVD2em1Tw7yw4r17Y1CJDUtGTiNI7xCcYhMMQ_YmvFztJvwPslyGolEHtZxpXNOEQRXcsfn0Mp1aovnZAq98fIYtD03jhfGw7dUIqPFJEB9HMY/w640-h480/40.jpg" width="640" /></a></div><div style="text-align: justify;">Then I installed new Beolover transport lock bushings. They come in two halves, which makes installation very easy:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJ6hR7VPM4yJs-qfTA9GKL3CKC6vbi6aOnpaVDia-hJZphviaP1SuQbPI7AQaMjVB1JhzLgryQluz8PI9boJ0XQS1Nav0fnXOAt9MnsEEygiUFIg0Gkk7iZxasEXedwpN03Lfy3Pu_5TePRBT4BG3dT5WwwuLjwNRqPYeLsNokmwm-CjeAOKNE8XcfvJY/s1200/41.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgJ6hR7VPM4yJs-qfTA9GKL3CKC6vbi6aOnpaVDia-hJZphviaP1SuQbPI7AQaMjVB1JhzLgryQluz8PI9boJ0XQS1Nav0fnXOAt9MnsEEygiUFIg0Gkk7iZxasEXedwpN03Lfy3Pu_5TePRBT4BG3dT5WwwuLjwNRqPYeLsNokmwm-CjeAOKNE8XcfvJY/w640-h480/41.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">Simply insert one half from the bottom</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9h2J796R3yqFe6jcaUSLmbUJ7eXQO4RYjFJDmpHaLR23mcbi4ADCvFqLIBOSGu-5uHBByj-_dicj6JY7jkoM5KrrL8tmWMuuas7NBnYWI_9Zfj40KVCnNNv2l_IzOBMLg2_d8FpBMR894SyiyflQIJCyOsMEPlvmU2h4oLV5DzVSUdJ3fNkK9vuo-SnU/s1200/43.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9h2J796R3yqFe6jcaUSLmbUJ7eXQO4RYjFJDmpHaLR23mcbi4ADCvFqLIBOSGu-5uHBByj-_dicj6JY7jkoM5KrrL8tmWMuuas7NBnYWI_9Zfj40KVCnNNv2l_IzOBMLg2_d8FpBMR894SyiyflQIJCyOsMEPlvmU2h4oLV5DzVSUdJ3fNkK9vuo-SnU/w640-h480/43.jpg" width="640" /></a></div><div style="text-align: justify;">And the other half from the top. Then the lock screws can be installed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAF9QbNxJYXITE5oE-eZSUoCUJpgE4c4G0fCWR_4FllrsA1DX1mmoyr0E_7xm4-d1pYHMP9PG-5uZpixQ3DbPp8M2LdKPUWhm5pKNlcJUL9S_qiepxi8nzEpv4oencl6p06xubv2W0xz0RNE76T6bpFcbP-aa2HGML4nuMIrsCNHBJDO0QiLHkl1GzBJc/s1200/45.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjAF9QbNxJYXITE5oE-eZSUoCUJpgE4c4G0fCWR_4FllrsA1DX1mmoyr0E_7xm4-d1pYHMP9PG-5uZpixQ3DbPp8M2LdKPUWhm5pKNlcJUL9S_qiepxi8nzEpv4oencl6p06xubv2W0xz0RNE76T6bpFcbP-aa2HGML4nuMIrsCNHBJDO0QiLHkl1GzBJc/w640-h480/45.jpg" width="640" /></a></div><div style="text-align: justify;">This shows a completely re-assembled lock:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1wBve3-gbAXHqZY73cqiePPFWnOnSYJekNT4FWcv0Dw9vNt5m_eOFc514v06n1oyx7goWs6Ug0bmSRUv3qHES4w2y6o9po5x4x8LNwaLkpJrWWB61rzL9bzg1k7-_H2CvsT65EAmBFt3k-wrK_DthkSwjRGG4CB0KBXYojRpQyhhGGxbrWz3SEM440uo/s1200/46.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1wBve3-gbAXHqZY73cqiePPFWnOnSYJekNT4FWcv0Dw9vNt5m_eOFc514v06n1oyx7goWs6Ug0bmSRUv3qHES4w2y6o9po5x4x8LNwaLkpJrWWB61rzL9bzg1k7-_H2CvsT65EAmBFt3k-wrK_DthkSwjRGG4CB0KBXYojRpQyhhGGxbrWz3SEM440uo/w640-h480/46.jpg" width="640" /></a></div></div><div><div style="text-align: justify;">When I re-installed the keypad assembly, I noticed that the two plexiglass spring assemblies that hold the RPM panel down were cracked:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjNVX8UGBPvskzDjG6VuIdNg1ud6415w8vSgi-lwNvJvKpkamlRCf78augY0icqX_5r5sVtDw1pC8U9SciTT983JNLl3r9L9vZLzp9AksxZrYkabTzzGFJon0-2oV-LHeu2X11hSGvuAf3p9EfcPMG7i0cy7dkOyVl8vOn3PAbP9oeZiS-SUyM4oTCVptI/s1200/47.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjNVX8UGBPvskzDjG6VuIdNg1ud6415w8vSgi-lwNvJvKpkamlRCf78augY0icqX_5r5sVtDw1pC8U9SciTT983JNLl3r9L9vZLzp9AksxZrYkabTzzGFJon0-2oV-LHeu2X11hSGvuAf3p9EfcPMG7i0cy7dkOyVl8vOn3PAbP9oeZiS-SUyM4oTCVptI/w640-h480/47.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh07lVnFnQNxKKOxOuWVW3lwhldkngtOU0gElEWf99uF9fTmB2p3qGxJ2fPc6lPSd9QZDYV8sUTc0lnppjxjjvcwg_RugNxzxpPhEUuyjTCnfOUeCwxgP72Xvqq-sGwOSiiQN0Gm5x7XfXVKAXyQK8ymHHBav4A8x7JVI_Q_g5xS80aOc_1pTC2Jed3cTo/s1200/48.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh07lVnFnQNxKKOxOuWVW3lwhldkngtOU0gElEWf99uF9fTmB2p3qGxJ2fPc6lPSd9QZDYV8sUTc0lnppjxjjvcwg_RugNxzxpPhEUuyjTCnfOUeCwxgP72Xvqq-sGwOSiiQN0Gm5x7XfXVKAXyQK8ymHHBav4A8x7JVI_Q_g5xS80aOc_1pTC2Jed3cTo/w640-h480/48.jpg" width="640" /></a></div><div style="text-align: justify;">This often happens and when it does, the RPM panel does not stay down in place anymore. Luckily, there are new replacements available from the Beoparts-shop in Denmark. All one has to do is transferring the metal spring clips:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJ7SocA0NpdyrhVkx-70jURe_1PxPEDaTxxbxUMeortAP03jjvVU4gzfIfhksyaxj1k5xNGT_Vemz6eThkMZcSKAnt4-Nfac8u-QFTjN-FGOnIk3gUwJPybWvGGAQmt9CgsTdyZ7HIB0lfk6hKr4vLQ8JRqf_Tz9nz7GfKEf0HOEaCQY5SM4H0JGgWyZc/s1200/49.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJ7SocA0NpdyrhVkx-70jURe_1PxPEDaTxxbxUMeortAP03jjvVU4gzfIfhksyaxj1k5xNGT_Vemz6eThkMZcSKAnt4-Nfac8u-QFTjN-FGOnIk3gUwJPybWvGGAQmt9CgsTdyZ7HIB0lfk6hKr4vLQ8JRqf_Tz9nz7GfKEf0HOEaCQY5SM4H0JGgWyZc/w640-h480/49.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhE4zy9GUy_hwprHKyjv5vDBRL9aem6p3_aLwmWpTmWhcpglWYvnXDNNPPznztAWrnuOPSoAMKuZ-9xHJrIITsdRFOfhJA08JNcfYexV7KEEtcvPshADtO-h6rfsXrQpD-valVrtQiTHpnGhjXWljyQMs14h9HkGIXAfRqIFNOl1mTqotWtOW4ALKdAM2I/s1200/49a.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhE4zy9GUy_hwprHKyjv5vDBRL9aem6p3_aLwmWpTmWhcpglWYvnXDNNPPznztAWrnuOPSoAMKuZ-9xHJrIITsdRFOfhJA08JNcfYexV7KEEtcvPshADtO-h6rfsXrQpD-valVrtQiTHpnGhjXWljyQMs14h9HkGIXAfRqIFNOl1mTqotWtOW4ALKdAM2I/w640-h480/49a.jpg" width="640" /></a></div><div style="text-align: justify;">Beolovely! Another issue with this deck was its bad condition power cord. It was very dirty</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjL6R0g98sFhNFk83xDUoN5qZHYdCDDlSI6xOIWMCcCE2Vcn0Zv_n7hjD4Pkeej-854Mz2KXDWEAeGAum7MRcyXxrEuYNDTwcweVaeFPTEMbVSDgNOpW_O9OqjbSTS18lPv2W9z0w7U-nLkLWwhC6WHDioZJT06E-vhEzSKhw6Bx3Vu3F7Fk6Fr8pXiwAQ/s1200/49b.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjL6R0g98sFhNFk83xDUoN5qZHYdCDDlSI6xOIWMCcCE2Vcn0Zv_n7hjD4Pkeej-854Mz2KXDWEAeGAum7MRcyXxrEuYNDTwcweVaeFPTEMbVSDgNOpW_O9OqjbSTS18lPv2W9z0w7U-nLkLWwhC6WHDioZJT06E-vhEzSKhw6Bx3Vu3F7Fk6Fr8pXiwAQ/w640-h480/49b.jpg" width="640" /></a></div><div style="text-align: justify;">and also had some damage. Almost looked like some audiophile rodents had a go at it!...;-):</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhsUo0sgU9n_5tK3HCNChDk7sXS2XJeD9wSUK8pA4dJ8nUc1eb87Hp_Qkwx-EW247hw6klxsU_z88CDo8u17bPB6EUJUAOA3A-Vmv1kntIH7dBcj4j5SHM0X06ycnoQ2jtvVhSpRVvg-THKABITo-ER2oi08zrYPfnI53T-ZlnOyyQuT_6gqX3ERxnkjl0/s1200/50.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhsUo0sgU9n_5tK3HCNChDk7sXS2XJeD9wSUK8pA4dJ8nUc1eb87Hp_Qkwx-EW247hw6klxsU_z88CDo8u17bPB6EUJUAOA3A-Vmv1kntIH7dBcj4j5SHM0X06ycnoQ2jtvVhSpRVvg-THKABITo-ER2oi08zrYPfnI53T-ZlnOyyQuT_6gqX3ERxnkjl0/w640-h480/50.jpg" width="640" /></a></div><div style="text-align: justify;">My customer decided that he could be happy with a shortened cable and so I removed it and cut off the damaged part, and re-installed it. The first step for such an operation is to take out the line voltage switch box (which is a placeholder in the 5526 US version of the 4004). It is held in place by two screws accessible from the bottom of the enclosure:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjP34OpQVjbgYKccC7E80yMgj4lcSBU9kiqHa5TOoa9-IPZcMr7OTnZBXvtRHgWSeubBZxd4KmqhpicSZ5nHIlqhoFqwjxSRBS-eSZh-cMZxh5DTk3M8w1eNryQgKAjbOWYNqFCVP7cu0VNFS8fOztJtZM1gEs_7NqptAdGo2gdjRmFdDpjnYzL8w34X14/s1200/51.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjP34OpQVjbgYKccC7E80yMgj4lcSBU9kiqHa5TOoa9-IPZcMr7OTnZBXvtRHgWSeubBZxd4KmqhpicSZ5nHIlqhoFqwjxSRBS-eSZh-cMZxh5DTk3M8w1eNryQgKAjbOWYNqFCVP7cu0VNFS8fOztJtZM1gEs_7NqptAdGo2gdjRmFdDpjnYzL8w34X14/w640-h480/51.jpg" width="640" /></a></div><div style="text-align: justify;">Once the box is open the in and out cabling becomes visible:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOhutZUsJKGdYw1ty6mNdsni9TNoS21LvfIlHfygEHUF2DjUwdLzbAejCU0FCEB8FzDcN5Ukw_FYOYOBEHH1odC24cCW9NmV-NjljJEonjet4f1EwsEH5aIEiDUGsLzOEttFVC9qeuBEXTG_yP3kDq3iqcP7yyJq0hSh4dENZPaLD3cXy9T0KkC4kZFMM/s1200/52.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOhutZUsJKGdYw1ty6mNdsni9TNoS21LvfIlHfygEHUF2DjUwdLzbAejCU0FCEB8FzDcN5Ukw_FYOYOBEHH1odC24cCW9NmV-NjljJEonjet4f1EwsEH5aIEiDUGsLzOEttFVC9qeuBEXTG_yP3kDq3iqcP7yyJq0hSh4dENZPaLD3cXy9T0KkC4kZFMM/w640-h480/52.jpg" width="640" /></a></div><div style="text-align: justify;">The wiring connects to the fuse holders in the top part of the box:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjic4mDS54fGdiFaCvFxaJE8tDw_xdKunMMXG85jqcr_26oIIfiYWj-l63XD5JoXNpfFZAuu0AwjH8EXdgngaNCsbdseVkX7-k6uLzsub2lyDFB-V5RHb3R_kE-0CH9VCrGZJuLONXRPBYYVw3K_tJS8-S3699Fw_VVWeZ1LMXrPvmRpArnvcwPXRV_0oQ/s1200/53.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjic4mDS54fGdiFaCvFxaJE8tDw_xdKunMMXG85jqcr_26oIIfiYWj-l63XD5JoXNpfFZAuu0AwjH8EXdgngaNCsbdseVkX7-k6uLzsub2lyDFB-V5RHb3R_kE-0CH9VCrGZJuLONXRPBYYVw3K_tJS8-S3699Fw_VVWeZ1LMXrPvmRpArnvcwPXRV_0oQ/w640-h480/53.jpg" width="640" /></a></div><div style="text-align: justify;">As so often, when I removed the fuses one of them came apart:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIEm-zlRpLobh-smzRva0M-jLHZyYiT4xhKkNk7A7uDNNgDkGMO6pX3MvS5gKt3sFy-YBU1RXaJ8vYSPy_UBjWXWLbNVh2DVW-21XjbsmZc0JVBsnLod6gcZWHm45VM6rLwZtwj-TK1O9-J7YaundW026FsvB-IsUf3iwuZAPFQMbTEpT-Ij_PmJkIbLc/s1200/54.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIEm-zlRpLobh-smzRva0M-jLHZyYiT4xhKkNk7A7uDNNgDkGMO6pX3MvS5gKt3sFy-YBU1RXaJ8vYSPy_UBjWXWLbNVh2DVW-21XjbsmZc0JVBsnLod6gcZWHm45VM6rLwZtwj-TK1O9-J7YaundW026FsvB-IsUf3iwuZAPFQMbTEpT-Ij_PmJkIbLc/w640-h480/54.jpg" width="640" /></a></div><div style="text-align: justify;">It seems fuses also deteriorate with age. The incoming cable is soldered to one end of the fuse clips. After de-soldering the wires they can be pulled out from the box:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDpfvWMpYCNHpRDogMowohcjJUKKp0shxi3ZNvULX0Kn645r0lLIoc9WEOWuqIEtC9ngfXoiHm_1So0n5nNJTmECqh8kgP-LrjKo7vIAeS2jXAGx3yMIUtVqo1B2GyQ3TpNXtJmSG1W8p_9X4X3pcDyTQ17buf0JYXq_qILNajaMCULreEzFZuISKishM/s1200/55.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDpfvWMpYCNHpRDogMowohcjJUKKp0shxi3ZNvULX0Kn645r0lLIoc9WEOWuqIEtC9ngfXoiHm_1So0n5nNJTmECqh8kgP-LrjKo7vIAeS2jXAGx3yMIUtVqo1B2GyQ3TpNXtJmSG1W8p_9X4X3pcDyTQ17buf0JYXq_qILNajaMCULreEzFZuISKishM/w640-h480/55.jpg" width="640" /></a></div><div style="text-align: justify;">I pulled the cable out, cut the damaged part off, cleaned it thoroughly and installed it again:</div></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4WemnbuX2mtm2HDJfKEZ-wh5jTBrVdJ82RkQ5c0xu2w9zi4EMOYesSFbTAS2f2_uL_H_LK6EWuQtsTIkfsTAStdHuPFMOpvwOfaLMsmu39_XOCU7al4vklNnRGo0GtYzsmi4sHhzSGpwv2KDpENQXFpMBVSnW865YJ8gtqV5befSnzGmQPCXALPqgYug/s1200/55a.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4WemnbuX2mtm2HDJfKEZ-wh5jTBrVdJ82RkQ5c0xu2w9zi4EMOYesSFbTAS2f2_uL_H_LK6EWuQtsTIkfsTAStdHuPFMOpvwOfaLMsmu39_XOCU7al4vklNnRGo0GtYzsmi4sHhzSGpwv2KDpENQXFpMBVSnW865YJ8gtqV5befSnzGmQPCXALPqgYug/w640-h480/55a.jpg" width="640" /></a></div><div style="text-align: justify;">Now it was time to do the adjustments. First I adjusted the collector voltage of TR3 to the prescribed 4V using my newly installed 5MOhm trimmer that replaced its fixed 1MOhm biasing resistor:</div><div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgW1vRzofLSkpYqtlOuV9iwW1pTCycg5N80mHIgnJsnM9kdkERb1uYMBadGWTa_GiGE74ep9SrerMKcB0bcIOOVQP8ymoWVATQyUdmPSe-ajEozOTaNJgBCvKgfBD1Uxvl5hlOg16IdNkLv24j_oyMH8XG36W6dwhboDTyRN-lQFqQ68LE2_O-L4vtXQ00/s1200/56.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgW1vRzofLSkpYqtlOuV9iwW1pTCycg5N80mHIgnJsnM9kdkERb1uYMBadGWTa_GiGE74ep9SrerMKcB0bcIOOVQP8ymoWVATQyUdmPSe-ajEozOTaNJgBCvKgfBD1Uxvl5hlOg16IdNkLv24j_oyMH8XG36W6dwhboDTyRN-lQFqQ68LE2_O-L4vtXQ00/w640-h480/56.jpg" width="640" /></a></div><div style="text-align: justify;">Using a trimmer instead of the fixed resistor allows compensating for the gain of the particular transistor that is installed. Even if transistors have the same type and come from the same batch, their gains are varying over a specified range, i.e. biasing may need to be adapted if there is no feedback like in this case. After doing any work on the record detection system it is a good idea to measure the sensor response over a spinning empty platter to see if the signal is strong enough to reliably disable arm lowering if there is no record on the platter. This Beogram passed with flying colors producing a strong 7.8V peak to peak signal:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEglI4GHt6NoygoZhFOx7vCgB5FGkIVPk6F-Ut6RRhlNg-lva2teodAPaGK9Kol8YXghDG-lk6Ih3d9rlaIIGv1HqmNacDMAq8mMQgyUy94pNKUYPWC2Mqm74cVgEZnoxmSqnWG6FJU5e0fMnkr8RlpJp6QEp5FYh2ZIxzmXumB_puhiLqon68eIRGHPbFA/s1200/57.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEglI4GHt6NoygoZhFOx7vCgB5FGkIVPk6F-Ut6RRhlNg-lva2teodAPaGK9Kol8YXghDG-lk6Ih3d9rlaIIGv1HqmNacDMAq8mMQgyUy94pNKUYPWC2Mqm74cVgEZnoxmSqnWG6FJU5e0fMnkr8RlpJp6QEp5FYh2ZIxzmXumB_puhiLqon68eIRGHPbFA/w640-h480/57.jpg" width="640" /></a></div><div style="text-align: justify;">Each trough in the signal corresponds to a passing platter rib as the platter spins under the sensor.</div></div><div style="text-align: justify;">After this I did all the necessary adjustments to level the platter, get the correct arms to platter distance and make the platter flush with the surrounding aluminum plates. This process can sometimes be tricky and repeat adjustments may be needed until a perfect alignment is achieved by iteration.</div><div><div style="text-align: justify;">Once these adjustments are done the arm lowering limit can be set:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigLi5-8NP-dzQ-VtTNG7_yr31VKaHGLNKaXF_K9MoLLt3KzKAsx9dGNB0gRco5scPOsPIw7L32Ib4pBbAdWk7KlDJxVdJgbgHx0xZkdlH9GAbgjl0zNVF6bAs9Cql_zAlVxw2DflK8_ZFVkspSA_X77RiH1RaSET097fH2zRj50RPs80LkyTVU4VkxAEc/s1200/58.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigLi5-8NP-dzQ-VtTNG7_yr31VKaHGLNKaXF_K9MoLLt3KzKAsx9dGNB0gRco5scPOsPIw7L32Ib4pBbAdWk7KlDJxVdJgbgHx0xZkdlH9GAbgjl0zNVF6bAs9Cql_zAlVxw2DflK8_ZFVkspSA_X77RiH1RaSET097fH2zRj50RPs80LkyTVU4VkxAEc/w640-h480/58.jpg" width="640" /></a></div><div style="text-align: justify;">It needs to make sure that the lower parts of the ribs are missed by the tip if the record detection mechanism would ever fail and allow the arm to be dropped on an empty spinning platter.</div></div><div><div style="text-align: justify;">Next I calibrated the tracking force by adjusting the counterweight on the tonearm. I usually also replace the flimsy retaining washer that B&O used to hold the adjustment screw in place with a nut. This allows securing the calibration in place to survive the rigors of shipping:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-lvKfnwogEeOlIrg0T70disc3-bK9xMh6zxQdx0twgPw4lUXcoQdhlArioud9Oo-5flZQhdidixbgFQb8SyFlKjGg3tVr4bj-bgD5PLOUY-EcCprp1F-NYaitqNMApMfD0ZQnr6TfLMZGjf3V3ecvBqcB_vp9rkhyB2A6LQ0B8Zv6Xoa3U_aeQ7TPk3E/s1200/59.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh-lvKfnwogEeOlIrg0T70disc3-bK9xMh6zxQdx0twgPw4lUXcoQdhlArioud9Oo-5flZQhdidixbgFQb8SyFlKjGg3tVr4bj-bgD5PLOUY-EcCprp1F-NYaitqNMApMfD0ZQnr6TfLMZGjf3V3ecvBqcB_vp9rkhyB2A6LQ0B8Zv6Xoa3U_aeQ7TPk3E/w640-h480/59.jpg" width="640" /></a></div><div style="text-align: justify;">I usually calibrate the weight adjustment wheel in a way that it is accurate around the 1.2g setting:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEisleQqSf2-1RuFrvurkK2j9GhpmP2XetdjgK-5fs5JhaUa5wg5hjz2uXXshyQbuCbQ4NBVOuzG5VMdETraBeKsb4tDUDIwLGRf4XXwU3pnsfCslR9guXcTtlndeC66aJS5ob4ewWItGcFgLA6fXopR0Ohufi7L98pYLqUCz2iqdfP65YCXf0ftv_CRlP4/s1200/60.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEisleQqSf2-1RuFrvurkK2j9GhpmP2XetdjgK-5fs5JhaUa5wg5hjz2uXXshyQbuCbQ4NBVOuzG5VMdETraBeKsb4tDUDIwLGRf4XXwU3pnsfCslR9guXcTtlndeC66aJS5ob4ewWItGcFgLA6fXopR0Ohufi7L98pYLqUCz2iqdfP65YCXf0ftv_CRlP4/w640-h480/60.jpg" width="640" /></a></div><div style="text-align: justify;">In the meantime the platter motor bearings had completed their oil infusion process. I extracted them from the oil and re-assembled the motor. Then it was time for a 24 hrs RPM stability test with the BeoloverRPM device:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgjo3KyfBpR_BLsBE-N90UKGZzI5uLS9F3KiBDyxYByNDPOYXIPelpVnnJYDMdkr3Z2ls-ttA7Fzkg-8w5ozAHND1uObGBr_8SwQCZCmuyFn6bbt8poc2Bo1fAjQziMxIyOmZ-0v39DUgVBeWFOjSWeUTiaowfPy_9A5ljiOKqv2DMiAMlga3OKirjML90/s1200/61.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgjo3KyfBpR_BLsBE-N90UKGZzI5uLS9F3KiBDyxYByNDPOYXIPelpVnnJYDMdkr3Z2ls-ttA7Fzkg-8w5ozAHND1uObGBr_8SwQCZCmuyFn6bbt8poc2Bo1fAjQziMxIyOmZ-0v39DUgVBeWFOjSWeUTiaowfPy_9A5ljiOKqv2DMiAMlga3OKirjML90/w640-h480/61.jpg" width="640" /></a></div><div style="text-align: justify;">It allows logging the RPM over extended periods of time in 10s intervals. This is the curve I measured after about 24 hrs:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1GTAOs8sQgirSGMhdAN-PxsyvcLxwRz4kOqAWFlpEwsJiT_jU7ctDDsEAT9v2lbQkrSCD2CQu-I4Ufvut-B8seDqitPX7190pwju-1EC-od3DFY49DqvK8JT3sG0Rvh6XsdgQi8DtrgTn61reu4_f7tPCv49feD5nhE44ECqRe9KQl0Hd1bhrJ0KUhLQ/s1024/61a%20Beogram%204004%20RPM%20stability.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="593" data-original-width="1024" height="370" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1GTAOs8sQgirSGMhdAN-PxsyvcLxwRz4kOqAWFlpEwsJiT_jU7ctDDsEAT9v2lbQkrSCD2CQu-I4Ufvut-B8seDqitPX7190pwju-1EC-od3DFY49DqvK8JT3sG0Rvh6XsdgQi8DtrgTn61reu4_f7tPCv49feD5nhE44ECqRe9KQl0Hd1bhrJ0KUhLQ/w640-h370/61a%20Beogram%204004%20RPM%20stability.jpg" width="640" /></a></div><div style="text-align: justify;">This is pretty much as good as it gets with Beogram DC platter motors. Since they are controlled by an analog feedback system there is some small RPM variation over time due to temperature changes etc...The small spikes should go away with time as the re-set bearings get polished by the shaft.</div></div><div><div style="text-align: justify;">Before it was finally time for a first test spin I replaced the 'beautifully' corroded original convertible DIN7 plug</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjFfr7sIWMe1-90qE1WYYNzP1S8j050agSL7N5_-FOzZSHJEPw8WZOCQN5QpMOiquNtHuMZwGKnJyd4k6p42Ov-k2B0hrAY6Yq7dvlMJikHDiDBB4JaXPDQ88uS9yDjpk7vOpPoAFpPOeNSiKGJeGk-JwHdMWBQ6fgcHQk_0ACjvrqkVu-swVDUVdqHIXE/s1200/62.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjFfr7sIWMe1-90qE1WYYNzP1S8j050agSL7N5_-FOzZSHJEPw8WZOCQN5QpMOiquNtHuMZwGKnJyd4k6p42Ov-k2B0hrAY6Yq7dvlMJikHDiDBB4JaXPDQ88uS9yDjpk7vOpPoAFpPOeNSiKGJeGk-JwHdMWBQ6fgcHQk_0ACjvrqkVu-swVDUVdqHIXE/w640-h480/62.jpg" width="640" /></a></div><div style="text-align: justify;">with a new all-metal DIN5 with gold plated contact terminals:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5AyfaZvWBzUaAKD57U_AvB95hXmb_V8zgmXgz_BF8r2VSYuz78mWG8UJmGXyk-hzT9iGDqPPJeLWPjbcbmtHQfMEzHxDZqI8IWBZZbAgBOoQZ9UsGrSyhq84-5XB4wYPZWC0ULmTpCUsj5kt9sP9oOtB88T6BvGtAOI1p88XABbtYMNEg2baLcweSjJA/s1200/63.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5AyfaZvWBzUaAKD57U_AvB95hXmb_V8zgmXgz_BF8r2VSYuz78mWG8UJmGXyk-hzT9iGDqPPJeLWPjbcbmtHQfMEzHxDZqI8IWBZZbAgBOoQZ9UsGrSyhq84-5XB4wYPZWC0ULmTpCUsj5kt9sP9oOtB88T6BvGtAOI1p88XABbtYMNEg2baLcweSjJA/w640-h480/63.jpg" width="640" /></a></div><div style="text-align: justify;">And then it was finally time to sit back and enjoy a first record on this beautiful Beogram 4004!</div></div><div style="text-align: justify;">I selected "The Summer Knows", a beautiful record from 1977 by Art Farmer (<a href="https://www.discogs.com/release/2755776-Art-Farmer-The-Summer-Knows" target="_blank">Inner City Records 6004</a>)</div><div><div style="text-align: justify;">Of course this vintage record was cleaned thoroughly with a <a href="https://www.cleanervinyl.com/proxl.html" target="_blank">CleanerVinyl ProXL ultrasonic record cleaner</a>. This restored this mint looking record to its original glory. A perfect match for this perfectly performing Beogram 4004!:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhD5AsW_LDtzHfmZApQth0-QHFfQyXLnSghThdgnIhiqcxJh97uUy4OwWhG1tB6uv6et5BP_2ES1GaEH2ed3gjyNbAE7C2JudczWILgW59_orFrEk9WBib0tIdn0rfyePpsWtHQVU8px1st9DZSRpn5qAuPE-SLM8bw5zCSrxx-mV80Ksrx9BY1na9JqXY/s1200/64.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="987" data-original-width="1200" height="526" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhD5AsW_LDtzHfmZApQth0-QHFfQyXLnSghThdgnIhiqcxJh97uUy4OwWhG1tB6uv6et5BP_2ES1GaEH2ed3gjyNbAE7C2JudczWILgW59_orFrEk9WBib0tIdn0rfyePpsWtHQVU8px1st9DZSRpn5qAuPE-SLM8bw5zCSrxx-mV80Ksrx9BY1na9JqXY/w640-h526/64.jpg" width="640" /></a></div><div style="text-align: justify;">I will play this deck some more to make sure that there are no intermittent issues. Once the Beoparts Shop in Denmark will be resupplied with reproduction hoods, this deck will also receive a new hood to complete its pristine almost like-new looks! Beolovely!</div><div style="text-align: justify;"> </div><p></p></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-87023412841400868462023-11-26T12:39:00.003-05:002023-11-26T12:39:41.565-05:00Beogram 4004: DC Platter Motor Restoration<p style="text-align: justify;">I recently received the DC platter motor of a Beogram 4004 from a customer in Poland for restoration. It exhibited the usual RPM variations due to dry motor bearings.</p><p style="text-align: justify;">This shows the motor as extracted from the packaging:</p><p></p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgp3GFy5PvTRjnWGf1E8i8advaXOToeXzEyWXlRjdugdHu5yh8CROaTOzfFx9qC1lsHUVG9c7YsbTS3kInb7ogddxOCakmpktuAb3UeZGZoXS35-668aFoQ2MT3iCjcE0KuZ1VSf-08aSHRRXX_G4iWuNgJlSVZ5dK-7Efhf6BSLvUningK_4kB34yKiQ4/s1200/100.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgp3GFy5PvTRjnWGf1E8i8advaXOToeXzEyWXlRjdugdHu5yh8CROaTOzfFx9qC1lsHUVG9c7YsbTS3kInb7ogddxOCakmpktuAb3UeZGZoXS35-668aFoQ2MT3iCjcE0KuZ1VSf-08aSHRRXX_G4iWuNgJlSVZ5dK-7Efhf6BSLvUningK_4kB34yKiQ4/w640-h480/100.jpg" width="640" /></a></div><div style="text-align: justify;">I disassembled the motor to extract the bearings:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbT6QvU1mTR1an9fWdq6l6JiXpTkY2ny59RG8DgM8Ud9FGUFIRPwLeRmraTSLRNUwmhGP0JX6LMH91NnKxo9sqGGG3Sux0rBy2h1N_T9zYUfjjKrUqqFyoau3QguAv9wC2OFi9wPS3CNM6wCv7JEsDjyasMnLO9T-pzJXQcDqUwjjp-jqk-fqb-OPj58s/s1200/99.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjbT6QvU1mTR1an9fWdq6l6JiXpTkY2ny59RG8DgM8Ud9FGUFIRPwLeRmraTSLRNUwmhGP0JX6LMH91NnKxo9sqGGG3Sux0rBy2h1N_T9zYUfjjKrUqqFyoau3QguAv9wC2OFi9wPS3CNM6wCv7JEsDjyasMnLO9T-pzJXQcDqUwjjp-jqk-fqb-OPj58s/w640-h480/99.jpg" width="640" /></a></div><div style="text-align: justify;">The bearings are the two small donuts on the black pad. I immersed them in oil and pulled a vacuum:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBYllaEbopgxVSmZ0wH2al2rmvZfrm-FIld8Ku4YnvYJAdQ8Zvl9IlGSTQEQiCcPsc8Y6LXzlNx50PzAEZB5j1ZWGfDzFM9wjCLH4L_6I52VjUANq6kZ0wAHNaC0M_lScvC0zhGnR1-GAGhFzULQPugMOJhEyfjrNCTy5JoN_C7ty29fSGzdeZXrCE3FQ/s1200/98.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhBYllaEbopgxVSmZ0wH2al2rmvZfrm-FIld8Ku4YnvYJAdQ8Zvl9IlGSTQEQiCcPsc8Y6LXzlNx50PzAEZB5j1ZWGfDzFM9wjCLH4L_6I52VjUANq6kZ0wAHNaC0M_lScvC0zhGnR1-GAGhFzULQPugMOJhEyfjrNCTy5JoN_C7ty29fSGzdeZXrCE3FQ/w640-h480/98.jpg" width="640" /></a></div><div style="text-align: justify;">Immediately strong bubbling started. This is indicative of air being drawn from the empty pores of the Oilite bearing material. This makes room for oil to diffuse into the bearing, replenishing its oil reservoirs.</div><p></p><p></p><div style="text-align: justify;">After about three days the bubbling stopped and I extracted the bearings from the oil:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhb9y-BCkjeFDQZdPdks9EiDqAOSxROzJOVo6l8dYsZUXc3aGjfQW2kqgd-G6qQ6nuNn6e9F0uuRygb0gY6XZRgGaRLDESRuJZhOwNmRSbJAZnucyAIJ09W7fVbbZr1iFOnJR3DrUd_lQzMaMTKzb6Rq1YBv5Zu7hgoLSg14ap1FMc4itHC163e9_vPCjA/s1200/97.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhb9y-BCkjeFDQZdPdks9EiDqAOSxROzJOVo6l8dYsZUXc3aGjfQW2kqgd-G6qQ6nuNn6e9F0uuRygb0gY6XZRgGaRLDESRuJZhOwNmRSbJAZnucyAIJ09W7fVbbZr1iFOnJR3DrUd_lQzMaMTKzb6Rq1YBv5Zu7hgoLSg14ap1FMc4itHC163e9_vPCjA/w640-h480/97.jpg" width="640" /></a></div><div style="text-align: justify;">I reassembled the motor and installed it in one of my Beogram 4002s for a 24 hrs RPM stability test with the BeoloverRPM device:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPTQiXn4-0_G_evzi-svfErhGHGhWNL4kfSsuYwNll_qdN7YNoXZLjTAx7hxqqvDnsD63ewL7mTG3CQCa934NEPaJBPMN8qod4nASfK9_umHvQNLFWj1DRZ3TnOg_UT8K0SyiBPdd8CClFz2S8sJOGvT4cocW4aUh0-hMyARZMGvH_0Tn9Jr8x1u8phbY/s1200/96.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPTQiXn4-0_G_evzi-svfErhGHGhWNL4kfSsuYwNll_qdN7YNoXZLjTAx7hxqqvDnsD63ewL7mTG3CQCa934NEPaJBPMN8qod4nASfK9_umHvQNLFWj1DRZ3TnOg_UT8K0SyiBPdd8CClFz2S8sJOGvT4cocW4aUh0-hMyARZMGvH_0Tn9Jr8x1u8phbY/w640-h480/96.jpg" width="640" /></a></div><div style="text-align: justify;">The BeoloverRPM allows logging the RPM in 10s intervals for extended periods of time, perfect for detecting sporadic RPM fluctuations. Luckily with this motor no significant fluctuations were detected. This is the curve I measured:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrhNcL5ywau12lps6mfkc_reOBHZbzUVWTVoK_IztaNWMKjSEBjgvtxqajtuMevKs2GO3eK3XfdMUWZI03fd23OxnUlBiqal-3355fIAhtHHVa6JF2sk8Aqz8gzZyPClKaMn8r7EnxDzCf7K-1ohyL9JdVQOeIrb7P1-pq3arofhH3-ES8qek4RF11ci8/s1024/95%20Beogram%204004%20RPM%20Stability.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="593" data-original-width="1024" height="370" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrhNcL5ywau12lps6mfkc_reOBHZbzUVWTVoK_IztaNWMKjSEBjgvtxqajtuMevKs2GO3eK3XfdMUWZI03fd23OxnUlBiqal-3355fIAhtHHVa6JF2sk8Aqz8gzZyPClKaMn8r7EnxDzCf7K-1ohyL9JdVQOeIrb7P1-pq3arofhH3-ES8qek4RF11ci8/w640-h370/95%20Beogram%204004%20RPM%20Stability.jpg" width="640" /></a></div><div style="text-align: justify;">A very nice curve! This motor is back in business and can be sent home to its Beogram!</div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;"><br /></div><br /><p></p>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-58165925210872192022023-11-15T17:24:00.008-05:002023-11-16T19:59:03.395-05:00Quad 33 Preamplifier: A B&O Project Diversion<p>Here is a quick non-B&O project that diverted my attention recently :-)</p><p>I did not know about Quad and the (famous) Quad 33 preamplifier growing up. It wasn't until I started working on Bang & Olufsen (vintage) audio components that I became aware of the Quad 33. A number of vintage B&O collectors I know also like Quad audio components so that created my interest.<br /><br />Recently, I decided to dive in and check one out. Currently, here in 2023, used, unrestored Quad 33 preamplifiers can be found in the $200 USD range. That's not bad and quite affordable when you hear one. Now that I have heard it I can see why it is popular. It sounds great.<br /><br />Here is the Quad 33 as I received it.<br /></p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj2FZw9DuX8os7m1w1wjOVFfksuhh1ZHWsod2-PSMI0edMWAxIGxsqzhQXV69kpYD_-IKtE2Mday6SEAo8wxzXGKm8-lszAutVcdIE5tpsQtktL8UjJqWGTDQ0bMUPwW1cap2YT1PlVsWK8hNz2rzWHRxYGJhCSXqsRWcRsAZSN8cyr9Q_EdCbduWa05_oF/s2200/quad_33_as_received_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="2045" data-original-width="2200" height="594" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj2FZw9DuX8os7m1w1wjOVFfksuhh1ZHWsod2-PSMI0edMWAxIGxsqzhQXV69kpYD_-IKtE2Mday6SEAo8wxzXGKm8-lszAutVcdIE5tpsQtktL8UjJqWGTDQ0bMUPwW1cap2YT1PlVsWK8hNz2rzWHRxYGJhCSXqsRWcRsAZSN8cyr9Q_EdCbduWa05_oF/w640-h594/quad_33_as_received_01.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br />The first thing that jumped out at me is how nice it looks.<br />It is a smart, clean design and it is very compact compared to other preamplifiers. Especially when the Quad 33 came out ... 1967 !<br /><br />I love how the rear panel input and output jacks label what the (DIN) pins are. That is great.<br />The Quad 33 uses 5 pin DIN jacks for the audio inputs and a 4 pin DIN jack for the preamplifier audio output signal. The 5 pin DIN inputs match what the Bang & Olufsen source components provide (i.e. Beogram and Beocord cable plugs). The 4 pin DIN audio output jack is not commonly found but plugs for those are available at places like <a href="https://www.mouser.com/ProductDetail/502-09BL4MX" target="_blank">Mouser</a>.</div><div><br /></div><div>The design of the Quad 33 preamplifier also provided a way for an owner to change the input gains for the Tape input/output and the Disc (phono) input.<br /><br />That is done using removable/changeable boards in the back of the Quad 33 cabinet.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhQrT_8YngKE8vYMBBqOiQ4wzXLHWSsp6HLNekYZeC2IZIiRRUdD6G8gk8GdsgkdwHcF8LhigECikZ8FyUi3nkOAh4k3f7WlgOqvQJ0KmZaROXvzZcP47G78b4g9RjzVUkujfxahIwbJ3uykuWr2U1UjVZvmWpo0HW4JT9EDHjB9iKrjHeVlGY1wkmRVGKT/s2200/quad_33_input_level_adj_pcbs_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhQrT_8YngKE8vYMBBqOiQ4wzXLHWSsp6HLNekYZeC2IZIiRRUdD6G8gk8GdsgkdwHcF8LhigECikZ8FyUi3nkOAh4k3f7WlgOqvQJ0KmZaROXvzZcP47G78b4g9RjzVUkujfxahIwbJ3uykuWr2U1UjVZvmWpo0HW4JT9EDHjB9iKrjHeVlGY1wkmRVGKT/w640-h480/quad_33_input_level_adj_pcbs_01.jpg" width="640" /></a></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBcIG2UOodRtzhpIdnRJ6ItB8YAYW9jDuAsPPE16FbMZI8s6ctk5SCGyYsOKU4wbXwNJLftdd0sLQ2sUV0PxCb0vg4cAaiviL7-u8ply7BNbdQ_ECIMyNySWwsnGnJUnizglB6pcFRI0_ao-UMk23zc07Tmpo5gnGpX1flXsQUBqI5g8idW-FZm4ZhtX_W/s2200/quad_33_input_level_adj_pcbs_02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjBcIG2UOodRtzhpIdnRJ6ItB8YAYW9jDuAsPPE16FbMZI8s6ctk5SCGyYsOKU4wbXwNJLftdd0sLQ2sUV0PxCb0vg4cAaiviL7-u8ply7BNbdQ_ECIMyNySWwsnGnJUnizglB6pcFRI0_ao-UMk23zc07Tmpo5gnGpX1flXsQUBqI5g8idW-FZm4ZhtX_W/w640-h480/quad_33_input_level_adj_pcbs_02.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><br /><br /><br /><br />Here is the Quad 33 with its outer cover removed.<br /><div><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7wP_VnUjNSqOHzN_bqAqdsHSPYMkCGPZi9ItrWJJmxIbFC3isya1hnx0fr6wGrvuIpshvONxHHNXvDH_gQyjyMLV7kBfDJ1GLWyZa906F3I8OqeVuRdecsTtV2slNXdnyrYFU5AK6tdkppMX4L3yc66v22Edi1GN33XdAg4ziy8D5Cu7B9cZrwXjzgK9Y/s2200/quad_33_as_received_02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1461" data-original-width="2200" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7wP_VnUjNSqOHzN_bqAqdsHSPYMkCGPZi9ItrWJJmxIbFC3isya1hnx0fr6wGrvuIpshvONxHHNXvDH_gQyjyMLV7kBfDJ1GLWyZa906F3I8OqeVuRdecsTtV2slNXdnyrYFU5AK6tdkppMX4L3yc66v22Edi1GN33XdAg4ziy8D5Cu7B9cZrwXjzgK9Y/w640-h426/quad_33_as_received_02.jpg" width="640" /></a></div><br /><div><br /><br /></div><div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />I have the primary preamplifier boards outlined in the photo above.<br />Starting on the left is the Disc (turntable) board (M12019). It is the phono preamp with the RIAA functionality.<br /><br />Next to the Disc board is the Power Supply (M12032). It includes the transformer and is switched on and off by a power switch built into the back of the volume control.<br /><br />On the far right are two preamplifier boards (M12017). One for each channel (left and right).<br /><br />One of the first things to check on a used Quad 33 preamplifier component is the Balance slider control that is just under the volume control (on the front panel). It turns out that it is very common for the mechanical control mechanism to have broken ... and no longer work.<br /><br />That was the case with mine.<br /><br />These next few photos show my Quad 33 with the front panel removed and the repair of the Balance control.<br /><br />The problem that occurs is that the Balance potentiometer starts to bind and becomes difficult to turn.<br />That puts pressure on a plastic fork piece that is the mechanical control of the Balance control.<br />Eventually the pressure is too much and the fork breaks off rendering the control mechanism non-functional. The next photo shows a disassembled Balance control with a broken fork.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJaWchBhJM5nvtLKoTJ4a1dUiqu_IZoX7Z42rpanUtM9tYQR0IaX72S2zGKZ02v5U6bcgPsWO-MH1jMx6jpZVC_COX7RNUoDAKIIP9Ikk6Jt36LGfX52JQ431P77Eu-jIKOU4a6byigXkxlaZ7R5DR0PeSuJQVJnylkNP7G3sIMURusgzXIqr0MnRxQ9Qf/s2200/quad_33_balance_control_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJaWchBhJM5nvtLKoTJ4a1dUiqu_IZoX7Z42rpanUtM9tYQR0IaX72S2zGKZ02v5U6bcgPsWO-MH1jMx6jpZVC_COX7RNUoDAKIIP9Ikk6Jt36LGfX52JQ431P77Eu-jIKOU4a6byigXkxlaZ7R5DR0PeSuJQVJnylkNP7G3sIMURusgzXIqr0MnRxQ9Qf/w640-h480/quad_33_balance_control_01.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br />The round post on the Control Lever is supposed to rest in the gap of the two-pronged, plastic fork.<br />As you can see, one side (prong) of the fork is no longer there.<br /><br />My repair for the broken fork was to design and make a 3D printed part that would just snap over the remaining fork part of the control. One reason for that is the white, plastic fork piece is glued into the Balance slide control.<br /><br />Here is the 3D part ready to be fit onto the Balance slider.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4y6oY8A0zhe9zpSn7ehM7YNnk20PD35nwo93yWktjhSEewJuc4K-xOMZfg5DDEKCAFsTnN6PpZMg-gsCkkQBAoXg1hA4tg5YecyGMm2s783_bx2AizhbPLWLBG4t1DzqZ-FW0yHN7_thyap_pxObx0vfLsci3UUPzEAbFl84UseOaTPMRfEZjQHwGnyZr/s2200/quad_33_balance_control_02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh4y6oY8A0zhe9zpSn7ehM7YNnk20PD35nwo93yWktjhSEewJuc4K-xOMZfg5DDEKCAFsTnN6PpZMg-gsCkkQBAoXg1hA4tg5YecyGMm2s783_bx2AizhbPLWLBG4t1DzqZ-FW0yHN7_thyap_pxObx0vfLsci3UUPzEAbFl84UseOaTPMRfEZjQHwGnyZr/w640-h480/quad_33_balance_control_02.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br />... and here is the 3D part installed. I just snapped it in place without glue. I plan to leave it like that and glue it in later if that becomes necessary.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiU7qHaudDo5sF450gEK5toYYEB-W6LZr6nDQ9lU0HF8errhh4en9K-1LQ4jG-1gKBMTp9fffEd_4kknypuF58niUqJzhqQuAE9BJ3Nbq9baBCO4SNvrPIzILI4Z8x6n9KvvD0U-WTFHoTBlfNvMcTNVN1a-2R5lLfS0JFehtyphu-ylqqss772Ix55GyxJ/s3320/quad_33_balance_control_05.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="3320" data-original-width="2200" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiU7qHaudDo5sF450gEK5toYYEB-W6LZr6nDQ9lU0HF8errhh4en9K-1LQ4jG-1gKBMTp9fffEd_4kknypuF58niUqJzhqQuAE9BJ3Nbq9baBCO4SNvrPIzILI4Z8x6n9KvvD0U-WTFHoTBlfNvMcTNVN1a-2R5lLfS0JFehtyphu-ylqqss772Ix55GyxJ/w424-h640/quad_33_balance_control_05.jpg" width="424" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />The above photo showing the repair of the broken, plastic fork also shows a different 1kΩ (linear) Balance potentiometer installed.<br /><br />The repair of the fork corrected the broken mechanical part of the Balance Control but it doesn't fix the problem that caused it. That was the original Balance potentiometer that started to bind (stiffen up).<br /><br />I took Balance potentiometer apart and cleaned it with Deoxit. That made a big difference and the potentiometer became easy to turn again. Note: Initially it would not turn without the aid of pliers !<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFlctjOPW25l2CQgCufehJjSq1QV1weobEBX38gofmPOOhcv2L0GeB_87ekeqYZmJixp3BvA9SkdIZfK8Uk8mzCS57rpIcqep9OhNEKXrtWzDEUzVgZOXYYhHa8UhXigFoDWZp99mYHByUXmBklgJwi8PnXHJOuv1oyF_2Cr_CNfET3uBsRYSuiXENaRKQ/s2200/quad_33_balance_control_03.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1044" data-original-width="2200" height="304" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFlctjOPW25l2CQgCufehJjSq1QV1weobEBX38gofmPOOhcv2L0GeB_87ekeqYZmJixp3BvA9SkdIZfK8Uk8mzCS57rpIcqep9OhNEKXrtWzDEUzVgZOXYYhHa8UhXigFoDWZp99mYHByUXmBklgJwi8PnXHJOuv1oyF_2Cr_CNfET3uBsRYSuiXENaRKQ/w640-h304/quad_33_balance_control_03.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />After reassembling the potentiometer I measured to see that it was functioning. It was.<br />However, the control did not feel smooth.<br /><br />So I decided to replace the potentiometer with a modern <a href="https://www.mouser.com/ProductDetail/652-3852A-282-102AL" target="_blank">Bourns 1kΩ potentiometer</a>.<br /><br />The replacement potentiometer is very smooth and quiet. The barrel of the control fit perfectly through the mounting hole. The only issue was that the shaft of the control was a little bit long to fit behind the Quad 33 front panel.<br /><br />Instead of cutting the metal control shaft off (to fit), I decided to just design and print another 3D part to act as a spacer. I designed the spacer to support the potentiometer key so I still had a mounting key.<br /><br />Here is the new Bourns potentiometer and mounting spacer installed.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj42a4AVc04ZU5aax152SQxUGfE4smAEWNfRW8_MVhuOLlhfcgQg5OnhANgcCfeZfFEaxCFmS2cKYhd_et0QbCxkr-E-7hac82Ntbwo5tTj1Qv55utUeJZoNETnC9mqQDwTw_c7BVeWfVE8_wRJVMw0cF7AYWOK_ZX-67GSwPCGgA7G2C43nbiWjwVy9xKi/s2200/quad_33_balance_control_04.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj42a4AVc04ZU5aax152SQxUGfE4smAEWNfRW8_MVhuOLlhfcgQg5OnhANgcCfeZfFEaxCFmS2cKYhd_et0QbCxkr-E-7hac82Ntbwo5tTj1Qv55utUeJZoNETnC9mqQDwTw_c7BVeWfVE8_wRJVMw0cF7AYWOK_ZX-67GSwPCGgA7G2C43nbiWjwVy9xKi/w640-h480/quad_33_balance_control_04.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br />Moving on from the Balance control repair I performed some capacitor replacement tasks.<br />That was to replace the old electrolytic capacitors in the Quad 33 with new electrolytic capacitors.<br /><br />Here are the Quad 33 areas where I replaced electrolytic capacitors.<br />Pretty minimal compared to my other recent audio restoration projects.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzIfEkSq74og-YOTsjG-rxYgbtXbsKdrNPYUwKM5LfIF0ZTxvRljOnAxvvoYtXlbboRqDslKmW0ZQFxsL-kmWDxvk0hcadCt6gbyqrcl9VLVsRz5V9to9ttNiYxZmngGyrUatUkzcVdjgdm5RNYdtw9yPN1mT9AmRauyH9lOuRGMQZarYYL5_b4Z2K0T17/s2200/quad_33_as_received_03.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1513" data-original-width="2200" height="440" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgzIfEkSq74og-YOTsjG-rxYgbtXbsKdrNPYUwKM5LfIF0ZTxvRljOnAxvvoYtXlbboRqDslKmW0ZQFxsL-kmWDxvk0hcadCt6gbyqrcl9VLVsRz5V9to9ttNiYxZmngGyrUatUkzcVdjgdm5RNYdtw9yPN1mT9AmRauyH9lOuRGMQZarYYL5_b4Z2K0T17/w640-h440/quad_33_as_received_03.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Here are the boards after the capacitor replacement.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2Yi5uy_agUSoOmhiwwKS_R1lCNhHZ3kG7ncO3VLJDMV6hFC4LPcWGE7olwUpEP3KJmK4H-z1TNWAOlBXFKt-HAWMllu_3xHJ4hWmxqZ3-huD92qL4ODBvfM3QiDMqvqqRb3HItGjXwK1oooTFHs-6zYisxwb3U279OBX1ev2-lHmpztkqEdmAdCXMFkmt/s2200/quad_33_recapped_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="2154" data-original-width="2200" height="626" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh2Yi5uy_agUSoOmhiwwKS_R1lCNhHZ3kG7ncO3VLJDMV6hFC4LPcWGE7olwUpEP3KJmK4H-z1TNWAOlBXFKt-HAWMllu_3xHJ4hWmxqZ3-huD92qL4ODBvfM3QiDMqvqqRb3HItGjXwK1oooTFHs-6zYisxwb3U279OBX1ev2-lHmpztkqEdmAdCXMFkmt/w640-h626/quad_33_recapped_01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />I won't show it but I also did some Deoxit cleaning on the other Quad 33 potentiometers (volume and filter controls) as well as the pushbutton switches.<br /><br />At this point I reassembled the Quad 33 and tested it with a Quad 405 (current dumping) power amplifier that I also recently acquired. The Quad 405 power amplifier only required a few capacitors replaced on each output amplifier board and nothing else.<br /><br />To my disappointment, the Quad 33 did not power up.<br /><br />That took me to the second mechanical switch repair that had to be performed.<br /><br />It turns out that a failed Quad 33 power switch is not uncommon either.<br /><br />Here is the problem I discovered after trouble-shooting, then opening up the Quad 33 power switch.<br /><div><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJtVUC12iPeCBsXhiysIInx1KBDl3W9IDdWHLFrHLW0VpuZMNnvTVgVNERTMkJXfKg-mf9EZssLCfIoYV79VQ9TEnnaqScW3f3tDRgwSRjG8NWJkJyY6NwiaDo-qTfc4Wh-kl-AxGPoFqR21nINB1L1ONRc9bPWISjp191A_xvjQV9RKaxATBh-QjbbO3D/s2200/Quad-33-power-switch-01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="2048" data-original-width="2200" height="596" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJtVUC12iPeCBsXhiysIInx1KBDl3W9IDdWHLFrHLW0VpuZMNnvTVgVNERTMkJXfKg-mf9EZssLCfIoYV79VQ9TEnnaqScW3f3tDRgwSRjG8NWJkJyY6NwiaDo-qTfc4Wh-kl-AxGPoFqR21nINB1L1ONRc9bPWISjp191A_xvjQV9RKaxATBh-QjbbO3D/w640-h596/Quad-33-power-switch-01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhyP4KuWlK1AUK1iquI9yhI7AsPeOQDka7r0HkZsCMb8lruLdSdxhyWibTNMBGqdXVbtVLpftMNOg3NjlM8Hfq3m38bgCzqPYMzI_BuPzEa9YRCdCYXNs2WPVnosLiUZLFyktp6g1of_4Dd1WL_KiV1u_aoppvchuSq18vhaHHMtVSiuntt47g8Zieq8WYL/s2200/Quad-33-power-switch-02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhyP4KuWlK1AUK1iquI9yhI7AsPeOQDka7r0HkZsCMb8lruLdSdxhyWibTNMBGqdXVbtVLpftMNOg3NjlM8Hfq3m38bgCzqPYMzI_BuPzEa9YRCdCYXNs2WPVnosLiUZLFyktp6g1of_4Dd1WL_KiV1u_aoppvchuSq18vhaHHMtVSiuntt47g8Zieq8WYL/w640-h480/Quad-33-power-switch-02.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />As you can see in the highlighted sections of the photo above, there are worn areas of the power switch contacts caused by arcing when the contacts close.<br /><br />The Quad 33 itself doesn't require a lot of power so my theory is that power switch wear like this more likely occurs when other electrical components are plugged in to the two AC line accessory jacks at the rear of the Quad 33 cabinet. Something like a power amplifier that also gets turned on when the Quad 33 is turned on would cause much more current to pass across the Quad 33 power switch contacts.<div><br /></div><div>In any case, my power switch was faulty and I had to repair it.<br /><br />One option was to just connect the fused AC line input directly to the Quad 33 transformer and not use the power switch. In that case the Quad 33 could be plugged into a nice surge protection device that has a power switch.<br /><br />I wanted to have the Quad 33 Volume/Power Switch work though ... so I opted to attempt a repair.<br /><br />It was not very easy as it turned out.<br />As you can see in the first photo of the disassembled power switch above, I was able to open it up.<br />That required carefully prying out the round phenolic switch contact board from the black, plastic housing.<br /><br />From there I filed and cleaned the switch contacts. That was pretty easy.<br /><br />The power switch reassembly is where the difficulty was.<br />Maybe there is some neat trick to it but I didn't find one.<br /><br />The main problem is to keep the switch components in place when the phenolic switch contact board is mated back into the housing. The metal spring mechanism presents the biggest challenge because it has to connect to a part on the switch contact board and to a part on the housing ... plus, the spring is fighting the attempt to do that.<br /><br />After quite a few unsuccessful tries I decided to use some thick damping grease that I use on my B&O projects (for damping lids closing). <br /><br />The damping grease is so thick that it kept the switch components from moving when I mated the switch contact board back into the housing (and maneuvering the spring in to place).<br /><br />Here is the reassembled power switch.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifM8TqzJT667Iiue0lNb27j1JCKSdbOb3Ivn0rudlULebrzPLCeoJ1SQapmofM37eXUj7y759hxBBDisR7HTwNJTGcOn6-si8M3JESKNjyHdhuIr2ddQoaRppcDeDz3VDujbDZRfG2RixJjxtkSTGvL2uiUqdWPLFY4s-csHZZvGItE_d9H7F0sX-LcREF/s2200/Quad-33-power-switch-03.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEifM8TqzJT667Iiue0lNb27j1JCKSdbOb3Ivn0rudlULebrzPLCeoJ1SQapmofM37eXUj7y759hxBBDisR7HTwNJTGcOn6-si8M3JESKNjyHdhuIr2ddQoaRppcDeDz3VDujbDZRfG2RixJjxtkSTGvL2uiUqdWPLFY4s-csHZZvGItE_d9H7F0sX-LcREF/w640-h480/Quad-33-power-switch-03.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />In case you are wondering ... yes, that is a spare Volume Control/Power Switch in the background.<br />Its power switch has the same failure.<br /><br />Although the contact switch assembly fit back into the housing snuggly, I didn't trust that it would remain that way with just friction so I used some JB Weld epoxy to seal the deal.<div><br /></div><div>Here is a photo of the Volume Control/Power Switch re-installed in the Quad 33.<br />In looking at the Quad 33 schematic that came with the preamplifier, I could see that the Volume Control/Power Switch assembly (both of mine) is missing a safety capacitor across the contacts that power is applied to.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjWDkXyfwv5BcsdVLKWiYwckV5X1BpYWAdTfyGQxZyLkGF4sGveJjmusvBF5lUqh4rebWMhOvfOpneK-HCWJ-uNpe2frfIFMgGPQWmzOs4M25zvqko2YKhOqjeNyzt0hbVtnqpqRZ-nsvPAUm5oiwHQkhPEgUp0s_-j0UR9GqsoSv0W2kMRvs8OlMeFH8_1/s2200/Quad-33-power-in-01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1525" data-original-width="2200" height="444" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjWDkXyfwv5BcsdVLKWiYwckV5X1BpYWAdTfyGQxZyLkGF4sGveJjmusvBF5lUqh4rebWMhOvfOpneK-HCWJ-uNpe2frfIFMgGPQWmzOs4M25zvqko2YKhOqjeNyzt0hbVtnqpqRZ-nsvPAUm5oiwHQkhPEgUp0s_-j0UR9GqsoSv0W2kMRvs8OlMeFH8_1/w640-h444/Quad-33-power-in-01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />I found out from another Quad 33 owner that has a working unit that the missing part (SKF24R) is a 0.042uF + 100Ω safety capacitor. I used <a href="https://www.mouser.com/ProductDetail/80-PMR209MB5470M100R" target="_blank">this one from Mouser</a>.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikV4TJVcc5eET-SwsY7l8jcnmXbr5VXVVLh8LEmyYQrM6-ME0W2o8lHbRy169yzlVWkRwSQhHGKtyAtPzrQzlpjnCL-5bomQxCApekcDBjdbM6COF6WNiQufDQ7zI-grJu9mHFiJZBpRA1gJrV_Q_-A9NqkCZ16kpChqqEiy2xl-L-w4vvF5WDTXOQr8gl/s2200/Quad-33-power-switch-04a.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1515" data-original-width="2200" height="440" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikV4TJVcc5eET-SwsY7l8jcnmXbr5VXVVLh8LEmyYQrM6-ME0W2o8lHbRy169yzlVWkRwSQhHGKtyAtPzrQzlpjnCL-5bomQxCApekcDBjdbM6COF6WNiQufDQ7zI-grJu9mHFiJZBpRA1gJrV_Q_-A9NqkCZ16kpChqqEiy2xl-L-w4vvF5WDTXOQr8gl/w640-h440/Quad-33-power-switch-04a.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />That took me to attempt number two of listening to music with the Quad 33.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7EcmN7J4A9BpHQb1PCepj6vw1wN7BLenWG9XF1E07s0DJnUjHWpYNNY_IWUKVlkeBuNdcVf1WqhRzZv5XaUn5uB7JjI3EM17N8vYdv5cUPDtkWuLJQSP5ymCsnNVb5dgBAN6AlhJ2nsnTRmCUKRAO8aAzNkAfaySrW2_wOUQsPTnJ8s15CSsSbPQECBd_/s2200/quad33_quad405_restored_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1280" data-original-width="2200" height="372" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7EcmN7J4A9BpHQb1PCepj6vw1wN7BLenWG9XF1E07s0DJnUjHWpYNNY_IWUKVlkeBuNdcVf1WqhRzZv5XaUn5uB7JjI3EM17N8vYdv5cUPDtkWuLJQSP5ymCsnNVb5dgBAN6AlhJ2nsnTRmCUKRAO8aAzNkAfaySrW2_wOUQsPTnJ8s15CSsSbPQECBd_/w640-h372/quad33_quad405_restored_01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />The audio was quite good ... when there was sound :-(<div><br /></div><div><div>I was experiencing a channel dropout whenever I operated a switch on the Quad 33 front panel. So obviously, there was some sort of bad connection going on there.</div><div><br /></div><div>I couldn't visually inspect and see the problem so I reasoned that I needed to disassemble and clean all of the front panel switches. That would give me piece of mind that the switches were indeed, clean.<br />The exercise of touching all of the switches would give me a chance to go over all of the solder joints too.<br /><br />So off I went on another switch repair exercise.<br /><br />The worst part of the pushbutton switch cleaning was getting to them.<br />I did have to remove a lot of the inner components of the Quad 33.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjn7gdEG-i9Q8ILGaXeN14h16V_SX5TROCz-WYmcAVCut1ZMpdFZVUjpHLqtNDGkonTLdNBUFXAOMBj6ItWzUTTBfsbYH4v_XwcgN0XcvlKkQlE8ZllPyqoOOrIxH8I_kmOoEcET46xIVaPlkMwd4D-zD9WaIGL8c3MMCazI51HJndkWXlixz0f5k1acs3r/s2200/quad_33_switch_buttons_00.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1353" data-original-width="2200" height="394" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjn7gdEG-i9Q8ILGaXeN14h16V_SX5TROCz-WYmcAVCut1ZMpdFZVUjpHLqtNDGkonTLdNBUFXAOMBj6ItWzUTTBfsbYH4v_XwcgN0XcvlKkQlE8ZllPyqoOOrIxH8I_kmOoEcET46xIVaPlkMwd4D-zD9WaIGL8c3MMCazI51HJndkWXlixz0f5k1acs3r/w640-h394/quad_33_switch_buttons_00.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgeXtLFPS2xrwtTELM-62M8IhMMmc3bs2ATOm4OIoQPhPSrgVkESblrfHK322Q1JWR74xZddyRuo9iQddAtZIgVyh6Bv188Sfh1zWYggkgtMFgDfZj1mevtOA0FCW023dV0lD4CJodpoRIfM8PhkmP4rduJ1iN86PLn_BL1yeTtLdP4Trovmhqg-6ET4irI/s2200/quad_33_switch_buttons_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="867" data-original-width="2200" height="252" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgeXtLFPS2xrwtTELM-62M8IhMMmc3bs2ATOm4OIoQPhPSrgVkESblrfHK322Q1JWR74xZddyRuo9iQddAtZIgVyh6Bv188Sfh1zWYggkgtMFgDfZj1mevtOA0FCW023dV0lD4CJodpoRIfM8PhkmP4rduJ1iN86PLn_BL1yeTtLdP4Trovmhqg-6ET4irI/w640-h252/quad_33_switch_buttons_01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />I removed the switch assembly for the stereo and source selection. It solders to a "motherboard" of the Quad 33 plus it has a small, interconnect board that solders on the top of it. So it required complete de-soldering and removing to clean.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj2IsBWOs8mgP0LYLthpT6z6-vXlUZPysU0tpi4KIKrO7aP_rGUXM1o-K45tCuuKRycfAzAsPfTAdaqGz0JbrSbCIiivEL3rYiKOmXNsDn7eZ_3yumfPTNF0e3umMyLY2jUEO3eg2VoQ6XPZ8Pcj36QI34K5HLqVkmD6AAnOp94z8Uj2xtKT9Y1NfbUNojl/s2200/quad_33_switch_buttons_02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1276" data-original-width="2200" height="372" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj2IsBWOs8mgP0LYLthpT6z6-vXlUZPysU0tpi4KIKrO7aP_rGUXM1o-K45tCuuKRycfAzAsPfTAdaqGz0JbrSbCIiivEL3rYiKOmXNsDn7eZ_3yumfPTNF0e3umMyLY2jUEO3eg2VoQ6XPZ8Pcj36QI34K5HLqVkmD6AAnOp94z8Uj2xtKT9Y1NfbUNojl/w640-h372/quad_33_switch_buttons_02.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />On the switch assembly for the Quad 33 filters, I decided I could clean them without removing the assembly from the Quad 33.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiNXeU4uuERqgBUVHDZshU1I81Y46GTBJ6DwOTPhGcywIuCoEDwOYK_0tO6p2_Rr7UNDQC9X_yVspRHsdU0rA6uj8mY3D7UFfsDuZYj_BnVX8yXjhzntpWEuY2iw_wjbEvpumJX3mSGOJ9sifV3LYLeRgGr_WyItb8IkclGvsHWNKpciv4sYLAztp0IQds3/s2200/quad_33_switch_buttons_03.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1372" data-original-width="2200" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiNXeU4uuERqgBUVHDZshU1I81Y46GTBJ6DwOTPhGcywIuCoEDwOYK_0tO6p2_Rr7UNDQC9X_yVspRHsdU0rA6uj8mY3D7UFfsDuZYj_BnVX8yXjhzntpWEuY2iw_wjbEvpumJX3mSGOJ9sifV3LYLeRgGr_WyItb8IkclGvsHWNKpciv4sYLAztp0IQds3/w640-h400/quad_33_switch_buttons_03.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Removing and opening up the pushbutton switches for cleaning was surprisingly easy. Easy compared to the switch assembly of a Beomaster 3000, 4000 or 4400 amplifier.<br /><br /><div>The main thing is to be in control of the individual switch when the spring is released. You don't want parts ejected across the room. Keeping control of the switch is pretty easy though :-).<br /><br />The switches are freed up from their respective switch holder assemblies by carefully lifting up metal tabs and removing three metal clips that group sets of switches together. For example the stereo and mono switches make up one switch group. The source selection make up another switch group and, of course, the filter buttons are a switch group.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6osp0kcwxJzmJwiyfLwW7so_Nk0jsNX3tegX5ofUFInfV8GM8Nb-UDdzcbZqcnNDRgDLpINbM0Iyf6rqA0SCAPfznZCoUExhme2OzOPK7g1jBFZUH0AIfI4OM0enwgl3LcPY-T1jFY5yne_beV9KDhMB71QyniTcHyeHLBy_-GUuK62yPa-OS192K9OaG/s2200/quad_33_switch_buttons_radio_switch_06.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6osp0kcwxJzmJwiyfLwW7so_Nk0jsNX3tegX5ofUFInfV8GM8Nb-UDdzcbZqcnNDRgDLpINbM0Iyf6rqA0SCAPfznZCoUExhme2OzOPK7g1jBFZUH0AIfI4OM0enwgl3LcPY-T1jFY5yne_beV9KDhMB71QyniTcHyeHLBy_-GUuK62yPa-OS192K9OaG/w640-h480/quad_33_switch_buttons_radio_switch_06.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Even though the switches are the same mechanical switch design, their assemblies are slightly different depending on the number of contacts in the switch.<br /><br />Here is one of the largest switches, the filter cancel button.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrXYHfMOdu9iZTfj0QDK7lLU1IxPmj15zvRr9PC7zeTKBqrn_hgE-A2D_N6NC0xCGYkpSSTG-aPYXIyMwvLu5EORQKPL0FFwfH_QytHHmM4C2p_EBceFH3iMWX2J2kOZfWaPgoWGEXORc5lU3VykLNrIIhVThmVZM_lSxyW1sIKLhwodd6yRf5Y1FhxRun/s2199/quad_33_switch_buttons_cancel_switch_04a.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="999" data-original-width="2199" height="290" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrXYHfMOdu9iZTfj0QDK7lLU1IxPmj15zvRr9PC7zeTKBqrn_hgE-A2D_N6NC0xCGYkpSSTG-aPYXIyMwvLu5EORQKPL0FFwfH_QytHHmM4C2p_EBceFH3iMWX2J2kOZfWaPgoWGEXORc5lU3VykLNrIIhVThmVZM_lSxyW1sIKLhwodd6yRf5Y1FhxRun/w640-h290/quad_33_switch_buttons_cancel_switch_04a.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />By first pulling the button spring back and releasing the front of the white, plastic clip ...<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhIKOBbkD_82D8CkjsU3gC8qGr32uUd0CWYSt77O-YkHwAgClqk3S5dFCe9tlOvGKrTnro1sgey-xb55EOMIj6h4aTUy6xWMn5veaUzw48DtSLio9ltUwEuiZRWIlA86Lm5gzOimFJVolCn_oNY5RV7YOIEeLIDSQ7zUKWQsHOsTPtYOCuDkVoN4OPSXxX/s2200/quad_33_switch_buttons_cancel_switch_04b.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhIKOBbkD_82D8CkjsU3gC8qGr32uUd0CWYSt77O-YkHwAgClqk3S5dFCe9tlOvGKrTnro1sgey-xb55EOMIj6h4aTUy6xWMn5veaUzw48DtSLio9ltUwEuiZRWIlA86Lm5gzOimFJVolCn_oNY5RV7YOIEeLIDSQ7zUKWQsHOsTPtYOCuDkVoN4OPSXxX/w640-h480/quad_33_switch_buttons_cancel_switch_04b.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />... the white plastic clip can be slid towards the back and lifted out.<br />WARNING: Removing the clip is what fully releases the spring. So the technique is the hold the pushbutton assembly together with one hand while removing the white, plastic clip with the other.<br />With the clip removed, you can slowly let go of the pushbutton assembly so the switch can be pulled apart without the spring causing any problem.<div><br /></div><div>Oh yeah, pull the switch part with the spring loaded contacts out of the switch with the switch situated with the bottom side up (as shown in the next photo).<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8MkWB2SEUy5TuaNxoeIv0UAK2nX5BiZbnNWwdwOml2bnQ9r9iugWnkZxJb7Q4IXYkWDsKUbAE8mMdvaOzI__lwSogQiJ1nqZNB29COxs8cPbWJH9mdOnqYmbCNsih0gtgwXUqxz1S2M6D4OFEtOzSceUhoBJQ4LOgRohWSCHmPWCT9ZP1vJeBq0tQbg-F/s2200/quad_33_switch_buttons_cancel_switch_04c.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1250" data-original-width="2200" height="364" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8MkWB2SEUy5TuaNxoeIv0UAK2nX5BiZbnNWwdwOml2bnQ9r9iugWnkZxJb7Q4IXYkWDsKUbAE8mMdvaOzI__lwSogQiJ1nqZNB29COxs8cPbWJH9mdOnqYmbCNsih0gtgwXUqxz1S2M6D4OFEtOzSceUhoBJQ4LOgRohWSCHmPWCT9ZP1vJeBq0tQbg-F/w640-h364/quad_33_switch_buttons_cancel_switch_04c.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />I used Deoxit on the contacts (with the tiny springs) and on the contacts inside the switch housing.<br />My cleaning tools were a small brush and a foam pad.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgpQQnkMSM8YCIrz6QVXcUNuEfpRjaS2G0UoRozV2BtN5F63x1qiQXrSwRHZdPpZst2dulHhst4HVaLbFZSbcR8sH2R8p3ZdAGQCMOm_ZAjpVEa8_eJgPVQKYHyBtmXF79u6AjOQ43Ap0cbCTt8ZWHQZOCu0ED-SGFdWzBkfK6CtzcQdqGU9SYz9Wb-50mm/s2200/quad_33_switch_buttons_cancel_switch_04d.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1245" data-original-width="2200" height="362" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgpQQnkMSM8YCIrz6QVXcUNuEfpRjaS2G0UoRozV2BtN5F63x1qiQXrSwRHZdPpZst2dulHhst4HVaLbFZSbcR8sH2R8p3ZdAGQCMOm_ZAjpVEa8_eJgPVQKYHyBtmXF79u6AjOQ43Ap0cbCTt8ZWHQZOCu0ED-SGFdWzBkfK6CtzcQdqGU9SYz9Wb-50mm/w640-h362/quad_33_switch_buttons_cancel_switch_04d.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Reassembly of the switch is just the reverse of the disassembly of course.<br /><br />Some of the pushbutton switches do not have the white, plastic clip that is removed.<br />Instead, they have a built in plastic tab that must be lifted to allow the switch to be disassembled.<br />Take care to keep the pushbutton assembly under control as the tab is released.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkRYJG4d6NDvWlKYY1POOchb2yLjw8AcDxziyfhBkFv2_ccS0cfJy6STZo4jmgnH8LsTP1Tlk6Z64twtIJpOYnsgW7vGc8hXrVLw-81Ik8uCqSjiJFezxpn6PpM9HnW4ca6yBSlcotdul6Rf33DDWmWRwuB37FPKZQPzFUvBdVWbKCDpMXcKoDJ2-odg9D/s2200/quad_33_switch_buttons_radio_switch_05a.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="818" data-original-width="2200" height="238" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkRYJG4d6NDvWlKYY1POOchb2yLjw8AcDxziyfhBkFv2_ccS0cfJy6STZo4jmgnH8LsTP1Tlk6Z64twtIJpOYnsgW7vGc8hXrVLw-81Ik8uCqSjiJFezxpn6PpM9HnW4ca6yBSlcotdul6Rf33DDWmWRwuB37FPKZQPzFUvBdVWbKCDpMXcKoDJ2-odg9D/w640-h238/quad_33_switch_buttons_radio_switch_05a.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />I cleaned all of the switches the same way.<br /><br />Overall, the task was not bad and went quickly. I was careful on each switch to make sure I was always in control of the spring.<br /><br />I reassembled the Quad 33 for the third time.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg2wJenwCxL0AQLTicWl1WR4zqoZ8jDwIxN30bsao57hvfrZIqAgmY0DQm6if38xEe7nmBUcqEvZbgMwCep2_vbQQwpHVGz7YRq3eIT4pKeULn39hiDRbtXMqRSO8E3o5cGqzXPXta2B3IsBZc3LFoJzda8FfGitO3MXji52tnU9ypvxE6yZzJeb2Nf7c6T/s2200/quad_33_recapped_02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1440" data-original-width="2200" height="418" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg2wJenwCxL0AQLTicWl1WR4zqoZ8jDwIxN30bsao57hvfrZIqAgmY0DQm6if38xEe7nmBUcqEvZbgMwCep2_vbQQwpHVGz7YRq3eIT4pKeULn39hiDRbtXMqRSO8E3o5cGqzXPXta2B3IsBZc3LFoJzda8FfGitO3MXji52tnU9ypvxE6yZzJeb2Nf7c6T/w640-h418/quad_33_recapped_02.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Finally, the Quad 33 is fully operational.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNzRlTfEWdvGnCzFkwwur5sc6w6fUX28ghyWmfEops5D1MdmedR8fyUe-pM2_n45pG7MZKrR7e6V_6ROM_vWP2qK1K8oPGp7AuRky97cE-WG2kZM4OSUtvNWz9gO-d-XIS8gk13mc2nhyphenhyphenX3fW0xHiPXuvDCGr5IKALCeOegMNO3LAS0UTyRsEAOhvZ-X0y/s2200/quad_33_recapped_03.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1304" data-original-width="2200" height="380" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNzRlTfEWdvGnCzFkwwur5sc6w6fUX28ghyWmfEops5D1MdmedR8fyUe-pM2_n45pG7MZKrR7e6V_6ROM_vWP2qK1K8oPGp7AuRky97cE-WG2kZM4OSUtvNWz9gO-d-XIS8gk13mc2nhyphenhyphenX3fW0xHiPXuvDCGr5IKALCeOegMNO3LAS0UTyRsEAOhvZ-X0y/w640-h380/quad_33_recapped_03.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />I did test it again with the Quad 405 power amplifier and a pair of Beovox MC 120.2 speakers.<br />It sounded very good and there are no glitches in sound. <br />Whatever it was, cleaning the switches or re-soldering all of the board joints, the channel dropout problem is gone.<br /><br />My next step was to build a preamplifier to power amplifier cable I could use with another power amplifier (other than the Quad 405 amplifier).<br /><br />I used a <a href="https://www.mouser.com/ProductDetail/502-09BL4MX" target="_blank">Switchcraft 4-pin DIN plug</a> and a pair of <a href="https://www.mouser.com/ProductDetail/523-ACJR-SBK" target="_blank">female RCA plugs</a> to make the cable.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGVElnmk2VXO84aZu22-ta11t6diEP7EbRbt5cPzKFZ4AYhBQPxdByt7v5hUfeHzLE2D1S2r8vmPLe2q-FKvcc2QpJ7FJcIbKYBRva2pXvgEwQd7dgb7KWwyyRQx3XK9hLMcRcOZRuurykbFgmP2tALvAypNjtAKVH7yrRspcC6seueVTMiwl0aTuCgGze/s2200/quad33_quad405_in_out_RCA_cable_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1561" data-original-width="2200" height="454" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGVElnmk2VXO84aZu22-ta11t6diEP7EbRbt5cPzKFZ4AYhBQPxdByt7v5hUfeHzLE2D1S2r8vmPLe2q-FKvcc2QpJ7FJcIbKYBRva2pXvgEwQd7dgb7KWwyyRQx3XK9hLMcRcOZRuurykbFgmP2tALvAypNjtAKVH7yrRspcC6seueVTMiwl0aTuCgGze/w640-h454/quad33_quad405_in_out_RCA_cable_01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />I will now test this wonderful little preamplifier with some other power amplifiers I own and do some music listening tests before doing any electronic measurements on the bench. </div>sonavoraudiohttp://www.blogger.com/profile/04144547857529140916noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-4026878372778429422023-11-04T18:48:00.000-04:002023-11-04T18:48:42.778-04:00Beogram 4002: DC Platter Motor Restoration<p style="text-align: justify;">I recently received the DC platter motor of a Beogram 4002 from a customer in Utah for restoration. Most Beogram 400x platter motors have dry bearings these days, and that usually results in intermittent RPM variations that get increasingly worse. Re-infusion of the bearings with oil is the cure for this issue.</p><p style="text-align: justify;">This shows the motor as received:</p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgr-ZnSycxihuEw_Tkn2_MvFYd91l8f5xZMYPKd9BtxemU8LSA9V1otPDX4Z0rDTMbnGi33cEWmR9cWPv0f0MOlS1QsjM-K5mQB37KBmtwXoOZHAv1j29CmzatfwcnQnJ2niBdHxOcxnhCQ9DkJH1qe4sfhhphIMttSEkRBxk5wsXdnnCbYVp2wegTi7Cg/s1200/1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgr-ZnSycxihuEw_Tkn2_MvFYd91l8f5xZMYPKd9BtxemU8LSA9V1otPDX4Z0rDTMbnGi33cEWmR9cWPv0f0MOlS1QsjM-K5mQB37KBmtwXoOZHAv1j29CmzatfwcnQnJ2niBdHxOcxnhCQ9DkJH1qe4sfhhphIMttSEkRBxk5wsXdnnCbYVp2wegTi7Cg/w640-h480/1.jpg" width="640" /></a></div><div style="text-align: justify;">I took it apart to get to the bearings:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiAfQB1pWj6XLtjA51TTSVKf-ViVrf1N3IDfHGnTezelLgVxYe4z1FnUdes-VWr9ZNVrWAWoyQPTgYT7bTJYjYHjVi9a0I6GnPUxc0deQckeSUDpK79PcJEh4QxzNxjhxzRpi_TvUlDbvrLjiGVoKL9xy-AK7xmGcJft3FBp7leWDkXbGA4lif6Mv8-GOw/s1200/2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiAfQB1pWj6XLtjA51TTSVKf-ViVrf1N3IDfHGnTezelLgVxYe4z1FnUdes-VWr9ZNVrWAWoyQPTgYT7bTJYjYHjVi9a0I6GnPUxc0deQckeSUDpK79PcJEh4QxzNxjhxzRpi_TvUlDbvrLjiGVoKL9xy-AK7xmGcJft3FBp7leWDkXbGA4lif6Mv8-GOw/w640-h480/2.jpg" width="640" /></a></div><div style="text-align: justify;">The bearings are the two small donuts on the black pad upfront. I immersed them in motor oil and pulled a vacuum. Immediately strong bubbling started:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgA3dZ1cg63eCAWy4bl238c3rHRuZAco5tqW83H8TG3MwNpENOk_0VlLOzQbqX71O3t2Y3XKBthj7MYu4oeyPILitllcOCkscUuKkKFcg-J8j_laQX3GDbK2xeVUgvLpnHM8R0g0H1-41nTzp8eFTfCZxLogB-DQ65GGlCmjMBSihkOYMvxl8UoJnb8NaE/s1200/3.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgA3dZ1cg63eCAWy4bl238c3rHRuZAco5tqW83H8TG3MwNpENOk_0VlLOzQbqX71O3t2Y3XKBthj7MYu4oeyPILitllcOCkscUuKkKFcg-J8j_laQX3GDbK2xeVUgvLpnHM8R0g0H1-41nTzp8eFTfCZxLogB-DQ65GGlCmjMBSihkOYMvxl8UoJnb8NaE/w640-h480/3.jpg" width="640" /></a></div><div style="text-align: justify;">This bubbling is indicative of air being drawn from the empty pores of the Oilite bearing material. Once the air leaves, the remaining vacuum allows oil to diffuse into the material. The process usually takes about 2-3 days until the bubbling stops. Then it is time to extract the bearings:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4OJvCMnu6aBtcGCL1ytjMd4d9St6aJZDbZzbC1NMsBT0e_yMc7RxxMeF_eDL5ajiJ-hjV2nADFPA9DiMAVLLZ1_kM0e_BuFXLj8Yl9AMXJ0R7fO8R6MeN_0yDcfidbiOdGcSl9ZgwgazSHU6NxZdSFDCiJD0zkyeBQMlbPEYyw8WIyZjhNd7QvVgo-lg/s1200/4.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj4OJvCMnu6aBtcGCL1ytjMd4d9St6aJZDbZzbC1NMsBT0e_yMc7RxxMeF_eDL5ajiJ-hjV2nADFPA9DiMAVLLZ1_kM0e_BuFXLj8Yl9AMXJ0R7fO8R6MeN_0yDcfidbiOdGcSl9ZgwgazSHU6NxZdSFDCiJD0zkyeBQMlbPEYyw8WIyZjhNd7QvVgo-lg/w640-h480/4.jpg" width="640" /></a></div><div style="text-align: justify;">I re-assembled the motor and then it was time to give it a 24 hrs RPM stability test with the BeoloverRPM device:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj6GGTkyMkyOn_BXGeEc5IFE895xcoeK2je_39lmODvItP-1T_HoHs5DgRVjGl3nrqoCr6R7_f1P0cRxJiLoUoi8e8xUhg4hbF3wzSG56mTKjERhyq_LbzqoV-7aByPb29xyJYz8zUbJzpL9q89HyTqGrGg03xv0cTBDXD6QD1OhyphenhyphennvR4f9f05WalQr89E/s1200/5.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj6GGTkyMkyOn_BXGeEc5IFE895xcoeK2je_39lmODvItP-1T_HoHs5DgRVjGl3nrqoCr6R7_f1P0cRxJiLoUoi8e8xUhg4hbF3wzSG56mTKjERhyq_LbzqoV-7aByPb29xyJYz8zUbJzpL9q89HyTqGrGg03xv0cTBDXD6QD1OhyphenhyphennvR4f9f05WalQr89E/w640-h480/5.jpg" width="640" /></a></div><div style="text-align: justify;">The BeoloverRPM allows logging the RPM for extended periods of time in 10s intervals, perfect for spotting intermittent RPM inconsistencies. This is the curve I measured after about 24 hrs:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhoT-CE4v7cAXt5mR4brQYCrxE-yg8Hd9f-bUlk1FEA91Z4NUMKN61uh-U6cntbjrBrPhkumn4iAlfCuJ2jJXd66qgWq0x2I5D2ig7jm2JhH4M8RIeiiytnYoGYjz_ynvedOtAD1iSK9b4hT8jQIybdKAQxrU1M4zwfClK069N7hI12wRQ05GAbQCnJdvE/s1024/Graph0.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="593" data-original-width="1024" height="370" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhoT-CE4v7cAXt5mR4brQYCrxE-yg8Hd9f-bUlk1FEA91Z4NUMKN61uh-U6cntbjrBrPhkumn4iAlfCuJ2jJXd66qgWq0x2I5D2ig7jm2JhH4M8RIeiiytnYoGYjz_ynvedOtAD1iSK9b4hT8jQIybdKAQxrU1M4zwfClK069N7hI12wRQ05GAbQCnJdvE/w640-h370/Graph0.jpg" width="640" /></a></div><div style="text-align: justify;">In terms of short term variations this curve is as good as it gets with the Beogram DC platte motors. The long-term drift is a sign for bearing and shaft 'getting used to each other' in their new orientations after the infusion process. The RPM will stabilize in a few 10s of hours. Until then it is a good idea to check the RPM periodically to make sure the speed is close to spec.</div><p><br /></p>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-48686917224035897922023-11-04T00:33:00.000-04:002023-11-04T00:33:02.638-04:00Beogram 4004 (5526): A New Arrival from California En Route to the UK<p>I recently received a Beogram 4004 that a customer in California sourced on ebay. Unfortunately, the unit suffered during shipping since the seller did not package it correctly and so the brand new replacement hood that came with it got damaged. Once I am done with the restoration this Beogram will be shipped to the UK.</p><p>This shows the Beogram after I extracted it from the box:</p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicYKLPhYkZwpZ8CdJZRFqWHp_zzJI27Q5-H_u0ujT_YACGd3SryJLEek-xJR5E0Qpktc1hzi4nTAu7PxW7M5N8ZAjQRXy-I7iqpra5eYa08942qrv1IqirikR1SvhLBsp3-CbjEUyO_XLskivfiQOIwM4VjetfwyNbX1bAtPY09fHIpNFmvE6jSgvlov0/s1200/1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="697" data-original-width="1200" height="372" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicYKLPhYkZwpZ8CdJZRFqWHp_zzJI27Q5-H_u0ujT_YACGd3SryJLEek-xJR5E0Qpktc1hzi4nTAu7PxW7M5N8ZAjQRXy-I7iqpra5eYa08942qrv1IqirikR1SvhLBsp3-CbjEUyO_XLskivfiQOIwM4VjetfwyNbX1bAtPY09fHIpNFmvE6jSgvlov0/w640-h372/1.jpg" width="640" /></a></div>The unit is in pretty decent condition. After cleaning the keypad a bit it revealed itself as almost pristine:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtPZPoreD2HlzImlEFo5WDhhYLFBd_LDGWRWsXRGb84S8y1fCvmMuJJM-RiWv-U31zKoR6vIXe80XTnuWuRdynzxly_Wvkvof6B7cawVqBYZ0I86b73CIb3jxDTEJJQWtQXPmg_QiW0jvQNuM9zxBB8OVGJy7i4Dmu93OxSx26J2QS7ruQTmjEq3lSvyI/s1200/2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtPZPoreD2HlzImlEFo5WDhhYLFBd_LDGWRWsXRGb84S8y1fCvmMuJJM-RiWv-U31zKoR6vIXe80XTnuWuRdynzxly_Wvkvof6B7cawVqBYZ0I86b73CIb3jxDTEJJQWtQXPmg_QiW0jvQNuM9zxBB8OVGJy7i4Dmu93OxSx26J2QS7ruQTmjEq3lSvyI/w640-h480/2.jpg" width="640" /></a></div>The plinth corners are also fairly good with only some minor chipping:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0ERJRcWhe3-ddji9LhBT4arPZzse6JL3ODilC3tIVwlrP68dL00wuOVh16xObaf1FcipLuqatE9Dq4mSxpZt_moScsAZRq-NiGr6bt1sP8VhyphenhyphenCbxJZJGbtVtdZwmytH0JrzNQ5AqhJpNIHKxhcs1JrVg8pf_qQXHo8aPi40dRZiDFLmHPD9b5fjn9zWs/s1200/2a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0ERJRcWhe3-ddji9LhBT4arPZzse6JL3ODilC3tIVwlrP68dL00wuOVh16xObaf1FcipLuqatE9Dq4mSxpZt_moScsAZRq-NiGr6bt1sP8VhyphenhyphenCbxJZJGbtVtdZwmytH0JrzNQ5AqhJpNIHKxhcs1JrVg8pf_qQXHo8aPi40dRZiDFLmHPD9b5fjn9zWs/w640-h480/2a.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgjW962rk4fzgXcxIBP0bqe7Gnjrct723rNzIDJ4xc87Ve4Dff90HCSmG0waFa5knLkbwvu7Q-Tic5ERbac58SNq4NFpMyCFMaFo9UT32z4_2FsZpfY9Fu5SEZuAuxVnIqxIk9mGDRgtevzMSod-SOm0d_au3vQUolwju8xbg5ErcWFVZMaQJN2y8k-R4I/s1200/2b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgjW962rk4fzgXcxIBP0bqe7Gnjrct723rNzIDJ4xc87Ve4Dff90HCSmG0waFa5knLkbwvu7Q-Tic5ERbac58SNq4NFpMyCFMaFo9UT32z4_2FsZpfY9Fu5SEZuAuxVnIqxIk9mGDRgtevzMSod-SOm0d_au3vQUolwju8xbg5ErcWFVZMaQJN2y8k-R4I/w640-h480/2b.jpg" width="640" /></a></div>Unfortunately, the platter has a few small scratches:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxLYQkhLvO-9HtEJ0ol7Ay1H7kGzp1RPD52Ksy7uAh6uL40OQ80JtaaEsAUQhScx2ei0bJrQLUCUB1K5i-26Dflhgomauoq3ui91QxuF-CcTVhzRLhCCh0klhvOF6mzGoG6-YFxfheKTvobtX6cZ-chiFvOCxl6fzQFzom4ICigURiO0_20VT0-Auaz_4/s1200/3.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxLYQkhLvO-9HtEJ0ol7Ay1H7kGzp1RPD52Ksy7uAh6uL40OQ80JtaaEsAUQhScx2ei0bJrQLUCUB1K5i-26Dflhgomauoq3ui91QxuF-CcTVhzRLhCCh0klhvOF6mzGoG6-YFxfheKTvobtX6cZ-chiFvOCxl6fzQFzom4ICigURiO0_20VT0-Auaz_4/w640-h480/3.jpg" width="640" /></a></div>The hood hinge has some corrosion:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0wVSgFLWwjKDyyuNMpzdOwvZ5owRzXUobcA37HboxXNIR8J4nLPL_knj0fwZTq3Z86dkdhi8PFbpiabyrgIxm4duxRGp_lZm2hePpix6rF7HI6qiFnUZU1RMpYA2lwj53TIuPs1lX9Ewlh47oeZ0pJ0XaHTe0YZm3eIFljlH62_u7zBd_77OSU3W3mPM/s1200/4.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0wVSgFLWwjKDyyuNMpzdOwvZ5owRzXUobcA37HboxXNIR8J4nLPL_knj0fwZTq3Z86dkdhi8PFbpiabyrgIxm4duxRGp_lZm2hePpix6rF7HI6qiFnUZU1RMpYA2lwj53TIuPs1lX9Ewlh47oeZ0pJ0XaHTe0YZm3eIFljlH62_u7zBd_77OSU3W3mPM/w640-h480/4.jpg" width="640" /></a></div>And very sadly, the brand new hood that the ebay seller purchased for this unit lost a piece during shipping:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2qP2lKHaVm1e1g6P-CWEbORb-oneHbL1Z-TWFgmLUgecRKMHSOMakAaTfLVH7paLicQ3v2tLD4U0I4Pb-C-UorbkGL1IKnDZsaM-QOYvDZ38rGtyikIdagpYnUAXuI2pkwofCBRhZ0qJCsxzgK_xMOKf1eIoAxOhrTJAKTcu6Y_N6KHkxCw9EOEB_E98/s1200/4b.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2qP2lKHaVm1e1g6P-CWEbORb-oneHbL1Z-TWFgmLUgecRKMHSOMakAaTfLVH7paLicQ3v2tLD4U0I4Pb-C-UorbkGL1IKnDZsaM-QOYvDZ38rGtyikIdagpYnUAXuI2pkwofCBRhZ0qJCsxzgK_xMOKf1eIoAxOhrTJAKTcu6Y_N6KHkxCw9EOEB_E98/w640-h480/4b.jpg" width="640" /></a></div>Luckily, reproduction hoods are now readily available so it will be easy to recover from this mishap.<div>After this visual inspection of the cosmetic condition, I removed the aluminum panels and had a look below deck:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2zhihmqMMHUIiQ3L5oZXl6UNOUsKVrd1GxyFSNRaTBbYP7BS1TReirxulyCT_ketzAWdL2rmf03GFR83Fg7SmNXruoK1HxmkurOWaGmHYtFgPmlC-OruVbICgB_RgWxPVm16WMtVxScfgVRoP8cqkNHQvUqRVxfbjVIdSk7LMCy7U5zedEX7RQnGutlY/s1200/5.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="665" data-original-width="1200" height="354" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2zhihmqMMHUIiQ3L5oZXl6UNOUsKVrd1GxyFSNRaTBbYP7BS1TReirxulyCT_ketzAWdL2rmf03GFR83Fg7SmNXruoK1HxmkurOWaGmHYtFgPmlC-OruVbICgB_RgWxPVm16WMtVxScfgVRoP8cqkNHQvUqRVxfbjVIdSk7LMCy7U5zedEX7RQnGutlY/w640-h354/5.jpg" width="640" /></a></div>As usual for the 4004 the transport locks are completely degraded and their fragments are strewn about the enclosure:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmHJyg7_teB4dBAyjmeY4oh_JJ8Cm0SKclt770S73_8Z-FyuP8TZwxqx9xtdNAlOmxltmsaW141QRzpD6BmhwLIFlzr6Kl-9AcC3hpcbzM64JaT8TvzkfvAWTLlLMWTE4VCceTeLNb7nnAAMAxPXsn34fcpzDVhQt9j6wD4LYU9fpOx-3t7SCOROLdhA4/s1200/6.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmHJyg7_teB4dBAyjmeY4oh_JJ8Cm0SKclt770S73_8Z-FyuP8TZwxqx9xtdNAlOmxltmsaW141QRzpD6BmhwLIFlzr6Kl-9AcC3hpcbzM64JaT8TvzkfvAWTLlLMWTE4VCceTeLNb7nnAAMAxPXsn34fcpzDVhQt9j6wD4LYU9fpOx-3t7SCOROLdhA4/w640-h480/6.jpg" width="640" /></a></div>The carriage pulley is also cracked:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgEM9iB8aEvNC3VV9E3vU9leTLjbZtOKKsjbny1dxNfkV6gLnqSYHDgN0FuDsQSBxTILBmwiV9-5MJhuX_6i5VlbSQIAzGfx5fkR_dPv9hJGtObHn97Edd20JAIR8pDuSkzzRR6dGb8htJTjp0KEUNsseRZNNacZT8utjThij5BbL68-98HvJE0y5YyS8U/s1200/7.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgEM9iB8aEvNC3VV9E3vU9leTLjbZtOKKsjbny1dxNfkV6gLnqSYHDgN0FuDsQSBxTILBmwiV9-5MJhuX_6i5VlbSQIAzGfx5fkR_dPv9hJGtObHn97Edd20JAIR8pDuSkzzRR6dGb8htJTjp0KEUNsseRZNNacZT8utjThij5BbL68-98HvJE0y5YyS8U/w640-h480/7.jpg" width="640" /></a></div>Luckily, all this can be fixed with new Beolover parts. </div><div>I plugged the unit in and pressed START. The carriage started moving and the arm stopped properly at the LP setdown point. All good signs suggesting that the restoration will likely be straight forward.</div><div>Stay tuned for my follow up post, which will describe the work done on this unit to get it back to like-new performance.</div><div><p><br /></p></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-23844404177161298212023-11-02T19:55:00.001-04:002023-11-14T12:00:13.352-05:00Beogram 4004 (5526): Complete Functional Restoration and a First Spin with an Awesome Recent Re-Issue of Pharoah Sander's Seminal 1977 Album 'Pharoah'<p style="text-align: justify;">This post discusses the restoration of a Beogram 4004 (Type 5526) that I recently received from a customer in Maryland. The initial assessment of this deck is posted <a href="https://beolover.blogspot.com/2023/10/beogram-4004-first-look.html" target="_blank">here</a>.</p><p style="text-align: justify;">This shows the unit with the aluminum panels removed:</p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5iTc1M8QORSR-ukfIEanVlqMttmSqPbLgER9cI8pHrQx0_HYnsvkxdi5XIzgCEeCJw5miYdXDLRUoBll_12OSTcwK0r4Pojx5DLVxnrN_5pkgco9bV30iwISamehkDHyKhK2Wg3HumW0xQ6iE5TYRIlgqdqL4waEMkNP0XMz39gTh9w8OQNhDP9Ul4k8/s1200/1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5iTc1M8QORSR-ukfIEanVlqMttmSqPbLgER9cI8pHrQx0_HYnsvkxdi5XIzgCEeCJw5miYdXDLRUoBll_12OSTcwK0r4Pojx5DLVxnrN_5pkgco9bV30iwISamehkDHyKhK2Wg3HumW0xQ6iE5TYRIlgqdqL4waEMkNP0XMz39gTh9w8OQNhDP9Ul4k8/w640-h480/1.jpg" width="640" /></a></div><div style="text-align: justify;">As usual, I started out with the DC platter motor. They usually need oil infusion of their dry bearings. This shows the motor after I extracted it:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzDcWMgBcbOjCFF3jn-a3MJkNTTtF6LNFSUEQ5ILu5rUqXR4lsrRxtvNPtlyCufJIKLrHJTrCaexndjb-9P9wwH8xdsk_Rkh6hbTezmOfRBAYJSyt5bHZOfCQSNCstcNchGHgpKfAGMNBrGgIkne6GIO4FwJLuJ7OoXpWNJza6BQwDLQNRO62qCWuTLBw/s1200/2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzDcWMgBcbOjCFF3jn-a3MJkNTTtF6LNFSUEQ5ILu5rUqXR4lsrRxtvNPtlyCufJIKLrHJTrCaexndjb-9P9wwH8xdsk_Rkh6hbTezmOfRBAYJSyt5bHZOfCQSNCstcNchGHgpKfAGMNBrGgIkne6GIO4FwJLuJ7OoXpWNJza6BQwDLQNRO62qCWuTLBw/w640-h480/2.jpg" width="640" /></a></div><div style="text-align: justify;">I disassembled it to get to the bearings:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigOkMlD5AszPetqobNN7DF6g0TQbZU9k7rq7jN8z8CzWRUwfVyWYqrUWJ5fdVZllOG0GG_wE5wAAjytPihP7al7VT1gAwOI4Cy2mm55yknaMUcPssRvrsrSLL6XG5cWXzIhuU4UMVLlEsIrvxg7dn4XinChcQd1kNWwXVD28g-NL87VcedAoDAWOXhpi8/s1200/3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEigOkMlD5AszPetqobNN7DF6g0TQbZU9k7rq7jN8z8CzWRUwfVyWYqrUWJ5fdVZllOG0GG_wE5wAAjytPihP7al7VT1gAwOI4Cy2mm55yknaMUcPssRvrsrSLL6XG5cWXzIhuU4UMVLlEsIrvxg7dn4XinChcQd1kNWwXVD28g-NL87VcedAoDAWOXhpi8/w640-h480/3.jpg" width="640" /></a></div><div style="text-align: justify;">The bearings are the small donuts on the black pad. I immersed them in motor oil and pulled a vacuum. Immediately, strong bubbling started:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguFhJX9K8y81_uXe0-cA9vyIrG6vjRoISj6Ju28JrGyrrbzaVl0Xksa8FeTWUvNHgz9jTDYWVcZjMRVP3fbgdnMyuVttnE6rpC9QsqYYe_JXdNrjlTPDp7e6FDEOW9HHfGgtMdGRh9MoSaBj_bOHHhCg3bYxojbLDQ6Y3fvVQ22Mg_a0L5N8Z5r4PO1m4/s1200/4.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguFhJX9K8y81_uXe0-cA9vyIrG6vjRoISj6Ju28JrGyrrbzaVl0Xksa8FeTWUvNHgz9jTDYWVcZjMRVP3fbgdnMyuVttnE6rpC9QsqYYe_JXdNrjlTPDp7e6FDEOW9HHfGgtMdGRh9MoSaBj_bOHHhCg3bYxojbLDQ6Y3fvVQ22Mg_a0L5N8Z5r4PO1m4/w640-h480/4.jpg" width="640" /></a></div><div style="text-align: justify;">This bubbling is indicative of air leaving the pores of the Oilite bearing material, making room for fresh oil. This process usually takes about 2-3 days. When the bubbling stops the pores are replenished with oil.</div><div style="text-align: justify;">While this was going on, I worked on the other restoration tasks.</div><div><div style="text-align: justify;">First I focused on the carriage. It carries the arm lowering mechanism, which usually needs cleaning and re-lubrication since the decades-old lubricants are often hardened, impeding the motion of the mechanism. This shows the arm lowering assembly consisting of solenoid, damper and linkages:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWHaPiExCAp-gsAUNAFdgnQ3bva4Zfnl1RpNS3Ow4uiC0GMgJBGwpq8kARjRuGJET6cL6FkHS_dJSbsUyUFyTUFNIBTLbpLBdxqqLqtcccFIUOrfBwKUDDWL4CGGLHYfp4BkgkeZfjfQrPJP7IHoCeavcp_voI8UUhtvK1UylRBtq9jSOR5bxIE4vah40/s1200/5.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWHaPiExCAp-gsAUNAFdgnQ3bva4Zfnl1RpNS3Ow4uiC0GMgJBGwpq8kARjRuGJET6cL6FkHS_dJSbsUyUFyTUFNIBTLbpLBdxqqLqtcccFIUOrfBwKUDDWL4CGGLHYfp4BkgkeZfjfQrPJP7IHoCeavcp_voI8UUhtvK1UylRBtq9jSOR5bxIE4vah40/w640-h480/5.jpg" width="640" /></a></div><div style="text-align: justify;">I removed all the moving parts as well as the rods on which the carriage travels and the spindle that drives it:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgkrDSltu2xszIal2GwdPax4jveWBeZFNZ1r0YmDNseLKXR7t34Nnbg8wtNU0QIsUUCe-ZWxXiAZFEAznUxs5uW8pioY55JeMoxyPcrFuLzrWfzwQsIb8nSnKi_obxKP8zDxzLU5R82wQ8QrDsAmcTfNmUTZw8ZM5Di3UvjOVF1YoEqYLIbFVFDGW5R3qQ/s1200/6.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgkrDSltu2xszIal2GwdPax4jveWBeZFNZ1r0YmDNseLKXR7t34Nnbg8wtNU0QIsUUCe-ZWxXiAZFEAznUxs5uW8pioY55JeMoxyPcrFuLzrWfzwQsIb8nSnKi_obxKP8zDxzLU5R82wQ8QrDsAmcTfNmUTZw8ZM5Di3UvjOVF1YoEqYLIbFVFDGW5R3qQ/w640-h480/6.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the carriage with the parts removed: </div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDfdmWmdC3ZalvLoQBUqcV6Qbg-BmxNAVZw_1cIdWD7aGGQ8EaS5DdhjFHPeft9fGVbXObNckO0z7aZoCSm2A3EPqDodKDB3S6VpBh0E8TNAjtbEEx1M5pHyPifiiT5oYCWk0ONY0C-0zrcxxL__6mPgE1JTh4Pk0ZVF452PlBsH35HqxAOVicXrwvtvA/s1200/7.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDfdmWmdC3ZalvLoQBUqcV6Qbg-BmxNAVZw_1cIdWD7aGGQ8EaS5DdhjFHPeft9fGVbXObNckO0z7aZoCSm2A3EPqDodKDB3S6VpBh0E8TNAjtbEEx1M5pHyPifiiT5oYCWk0ONY0C-0zrcxxL__6mPgE1JTh4Pk0ZVF452PlBsH35HqxAOVicXrwvtvA/w640-h480/7.jpg" width="640" /></a></div><div style="text-align: justify;">I put everything into an ultrasonic cleaner for an hour, which removed all the old lubricants and made everything nice and shiny:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9U6OF_iXKadhs3zkOaA8e5I-S2267Mw7HGmz5peDoINS0rrprD1Z_c0j2NDVuEV8w28X6FoC2NY8xdkPi_JDp4D4KoyAcWRXS-oP6ir6p8lGhXe-GrhDkV1Ho0LCTo_AiTl-D2KHMe0sbt3gBLy_KxNPD5zlEldR42SnMCHiakt1r8Tx2gknUkLFN_L0/s1200/8.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9U6OF_iXKadhs3zkOaA8e5I-S2267Mw7HGmz5peDoINS0rrprD1Z_c0j2NDVuEV8w28X6FoC2NY8xdkPi_JDp4D4KoyAcWRXS-oP6ir6p8lGhXe-GrhDkV1Ho0LCTo_AiTl-D2KHMe0sbt3gBLy_KxNPD5zlEldR42SnMCHiakt1r8Tx2gknUkLFN_L0/w640-h480/8.jpg" width="640" /></a></div><div style="text-align: justify;">Then I started re-assembling everything. An important aspect is replacing the damper gasket, which stops the air flow through the plunger during arm lowering. The original gaskets are often hardened, and that can cause unwanted inconsistencies of the arm lowering speed. This shows the new gasket in place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZ1oiH0eDB1q42u-gr-hSJGIqIV37nHCxELDlU7044cd_oPuwE9ZDK6cUyD8t3ReG8ixxIfZ79b0jFUfizSJRQwcGOUFCKyRajpB5cAD6iWNpRFcPU8hPePPCbD09CdHgZINrsSBqs9g0dNPZyVss3BLbUoHzcHU9vCqDrqaRzd-VAfRpRjF7s3nBCw1I/s1200/9.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZ1oiH0eDB1q42u-gr-hSJGIqIV37nHCxELDlU7044cd_oPuwE9ZDK6cUyD8t3ReG8ixxIfZ79b0jFUfizSJRQwcGOUFCKyRajpB5cAD6iWNpRFcPU8hPePPCbD09CdHgZINrsSBqs9g0dNPZyVss3BLbUoHzcHU9vCqDrqaRzd-VAfRpRjF7s3nBCw1I/w640-h480/9.jpg" width="640" /></a></div><div style="text-align: justify;">There is one more linkage that connects the damper plunger with the arm. It is part of the sensor arm assembly. Here you can see it from the side. It presses down the arm lever via the V-shaped cutout on this lever:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjFYyckhElfMvKa_eqrdXVarM9Q7sbqEUS3njlhllrg7mBvPYWSVMchqV4nqnkqsFmcaLX4m-ATDrxoLhRWEWC8SQ91SM9YQYG2e0mFuRRM3FG4t6-Hq6BPTGwQDvxOfLtcTAgb1GPd2XAGyYDt06qe5obnu2PJ0WCPkOw-iSntf-8YxYqSWArPuukOZpg/s1200/10.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjFYyckhElfMvKa_eqrdXVarM9Q7sbqEUS3njlhllrg7mBvPYWSVMchqV4nqnkqsFmcaLX4m-ATDrxoLhRWEWC8SQ91SM9YQYG2e0mFuRRM3FG4t6-Hq6BPTGwQDvxOfLtcTAgb1GPd2XAGyYDt06qe5obnu2PJ0WCPkOw-iSntf-8YxYqSWArPuukOZpg/w640-h480/10.jpg" width="640" /></a></div><div style="text-align: justify;">I removed the sensor arm to get the linkage out:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjY1PetlGe89CUjEHxI6PMD0hv9nRp3-6Mvt8Z5ZyQvKzMJwTE-OrxoS3PkkfFU4FySMEUkb07ZVhNLqsix6OsLJ_m8kKlYlb1h-oAQ8y7VAUKKB9z2932J7GCGtetcpSFJAtEdcjaPUnCLaWoZtBV-paDGoL_BRNnpgi6oqtWNwRMDjYM61BkPJvzg_TU/s1200/11.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjY1PetlGe89CUjEHxI6PMD0hv9nRp3-6Mvt8Z5ZyQvKzMJwTE-OrxoS3PkkfFU4FySMEUkb07ZVhNLqsix6OsLJ_m8kKlYlb1h-oAQ8y7VAUKKB9z2932J7GCGtetcpSFJAtEdcjaPUnCLaWoZtBV-paDGoL_BRNnpgi6oqtWNwRMDjYM61BkPJvzg_TU/w640-h480/11.jpg" width="640" /></a></div><div style="text-align: justify;">As usual the small copper plate that helps the arm move laterally when up came off:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiRuMfpTeLylyvS8pDVSA2d2spGa8jFPyoxUPAec7F8GbfKVX6cWhoWGMllZ8I_GLTX3OecRSRw19vvV8d5F0_Aq1FVMgc999hvuM7UipxV8ZuZKKn1NZvRgj9EWwiJ_Grm2U6cspkpPJl9MIFvv-SavkmZMwMwvQLb6stl5DCuIcxuxANd3HBg-wWOWHE/s1200/12.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiRuMfpTeLylyvS8pDVSA2d2spGa8jFPyoxUPAec7F8GbfKVX6cWhoWGMllZ8I_GLTX3OecRSRw19vvV8d5F0_Aq1FVMgc999hvuM7UipxV8ZuZKKn1NZvRgj9EWwiJ_Grm2U6cspkpPJl9MIFvv-SavkmZMwMwvQLb6stl5DCuIcxuxANd3HBg-wWOWHE/w640-h480/12.jpg" width="640" /></a></div><div style="text-align: justify;">It is only attached with some usually degraded double sided tape. I removed the tape remnants and glued it back into place with epoxy:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWG5RXe8pMlO_Mgny62roZrEC2whdKgWemBC8AgZK_TOpc6eiKvTjAEkO70El7xik80SP9mljHEU_56Cu2ejjjzVk07S3hrPmSqL2Q72usOOMSdlyDZAdEmRRYNWyhQo-cYx1Fay-U_YVKck4hFr_kU_eIzgCyzKfXVuVZRTioW_gWsczB9eI3Xy-Blgo/s1200/13.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWG5RXe8pMlO_Mgny62roZrEC2whdKgWemBC8AgZK_TOpc6eiKvTjAEkO70El7xik80SP9mljHEU_56Cu2ejjjzVk07S3hrPmSqL2Q72usOOMSdlyDZAdEmRRYNWyhQo-cYx1Fay-U_YVKck4hFr_kU_eIzgCyzKfXVuVZRTioW_gWsczB9eI3Xy-Blgo/w640-h480/13.jpg" width="640" /></a></div><div style="text-align: justify;">After re-assembling everything I focused on the tracking sensor light bulb, which is in the black housing directly under the arms. This shows the original setup:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzWWK34y2TVPljvaKn2UzrsZc-rSlgbhs28iz-hoyNxkysDGtNlIJB_2XtMvX9AQMkaw0zw0t0PtsLdFpa_zz7dOGx3quLB6BwjeWzS6zmLEsPO8K0usEHE0GT9s4JfGRGpbN5pj2Y6kZo0TdAIs36EM1H9BLJIL1DI77_NSWRPwbMyMY8WuNUO1P_6Ag/s1200/15.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzWWK34y2TVPljvaKn2UzrsZc-rSlgbhs28iz-hoyNxkysDGtNlIJB_2XtMvX9AQMkaw0zw0t0PtsLdFpa_zz7dOGx3quLB6BwjeWzS6zmLEsPO8K0usEHE0GT9s4JfGRGpbN5pj2Y6kZo0TdAIs36EM1H9BLJIL1DI77_NSWRPwbMyMY8WuNUO1P_6Ag/w640-h480/15.jpg" width="640" /></a></div><div style="text-align: justify;">I usually replace it with a Beolover LED based replacement assembly. This shows the original bulb and the LED part in comparison:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPquKaQx9QOtJXDFrVFbIK8egXVjGrEUlxSN2E30heue26ZGpu0mLvvcuq5oY5qD9_BMYxpcVxliIawzNBCABPG1MTE550GcScBJY0EC0g8RHUZ58EOIGx_zuJ4EM-qWznr5zRA1TiAB2hZNUZzPe9b9IISL4hYySUz9yooHVPa65vI4NJ55hnbvnOETg/s1200/16.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPquKaQx9QOtJXDFrVFbIK8egXVjGrEUlxSN2E30heue26ZGpu0mLvvcuq5oY5qD9_BMYxpcVxliIawzNBCABPG1MTE550GcScBJY0EC0g8RHUZ58EOIGx_zuJ4EM-qWznr5zRA1TiAB2hZNUZzPe9b9IISL4hYySUz9yooHVPa65vI4NJ55hnbvnOETg/w640-h480/16.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">The LED is located at the same position as the original bulb filament. This shows the LED part implanted:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgF5GBvUtI-v7SrQzcIEcoleFOAWMBo4ZykNxqbdlARyCvZhqBDn71en9i2IAcMj28oWXUZxt_EnxkqHFRy6o-YDCXG6ISf_npArlG3hLjYPpL2zAGbqHYvownIxHrHQUuDA6fw3GzQa0kQ4WtNcVH3Lym61hPk-aaHc8jeB0WEe-SDXFdwSH8q_iiCAvo/s1200/14.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgF5GBvUtI-v7SrQzcIEcoleFOAWMBo4ZykNxqbdlARyCvZhqBDn71en9i2IAcMj28oWXUZxt_EnxkqHFRy6o-YDCXG6ISf_npArlG3hLjYPpL2zAGbqHYvownIxHrHQUuDA6fw3GzQa0kQ4WtNcVH3Lym61hPk-aaHc8jeB0WEe-SDXFdwSH8q_iiCAvo/w640-h480/14.jpg" width="640" /></a></div><div style="margin-left: 1em; margin-right: 1em; text-align: justify;"></div></div><div><div class="separator" style="clear: both; text-align: justify;">The small white 'box' on the implant is a trimmer that allows tuning the LED intensity. This can be helpful when calibrating the tracking feedback. The final task was to replace the cracked original plastic carriage pulley</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhCBT7Y-piMNRhcn74u7x5JnlpLlin-WT1RqqljKybGJEumA-W1aID1ZmuvYGIXQcELW-gHcjuW1QPeRkQIM_Dko4Unp5Y7YacYZjkxwB3_hcxAAnXOmDVHfwIfFFR8bnrbpjJlwsY6tWqbIzVpvNXB89XKWfl0m27vKRBp2TUb61cu0u_5uQYQ4oFqsWo/s1200/18.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhCBT7Y-piMNRhcn74u7x5JnlpLlin-WT1RqqljKybGJEumA-W1aID1ZmuvYGIXQcELW-gHcjuW1QPeRkQIM_Dko4Unp5Y7YacYZjkxwB3_hcxAAnXOmDVHfwIfFFR8bnrbpjJlwsY6tWqbIzVpvNXB89XKWfl0m27vKRBp2TUb61cu0u_5uQYQ4oFqsWo/w640-h480/18.jpg" width="640" /></a></div><div style="text-align: justify;">with a nice new machined aluminum pulley and a new belt:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZuafJz8CmAEJDf27kVNze3_lX3xuPM9uYJAus2AKan8qlgLXlhiXptcdALOYkCdIS_ExArPWqJRDLxx4Z7MSNPDJxjW7Ov80g4k1D1IWYYaWKgMPZtmjgd79sGkRt7EnjpU79I0Qe3ChNw79eOe_gmGk5e8v7S6Lni6Ss7WWKzltQXS2XyRSJRraddHY/s1200/19.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZuafJz8CmAEJDf27kVNze3_lX3xuPM9uYJAus2AKan8qlgLXlhiXptcdALOYkCdIS_ExArPWqJRDLxx4Z7MSNPDJxjW7Ov80g4k1D1IWYYaWKgMPZtmjgd79sGkRt7EnjpU79I0Qe3ChNw79eOe_gmGk5e8v7S6Lni6Ss7WWKzltQXS2XyRSJRraddHY/w640-h480/19.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">And this concluded the rebuilding of the carriage:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDRTYOI7B2OpwQU0YjViP2cHTt7TLVT-KVVQSW7Ay6c8IcVvqXy1SdawocwkFEPvGWvrSsHUb9Hsi_Un7hjXbgdtDkJHuiCZuJVDc3nKdr7sR8-SiZ89SRkLHfDvGAraHlbfwpYB2WLDWrH64aDP14jq7VeGHyycXycxru-jp7zzqHTdtk6FEIiA7eH9Q/s1200/17.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDRTYOI7B2OpwQU0YjViP2cHTt7TLVT-KVVQSW7Ay6c8IcVvqXy1SdawocwkFEPvGWvrSsHUb9Hsi_Un7hjXbgdtDkJHuiCZuJVDc3nKdr7sR8-SiZ89SRkLHfDvGAraHlbfwpYB2WLDWrH64aDP14jq7VeGHyycXycxru-jp7zzqHTdtk6FEIiA7eH9Q/w640-h480/17.jpg" width="640" /></a></div><div style="margin-left: 1em; margin-right: 1em; text-align: justify;"></div></div><div><div style="text-align: justify;">Next came the main circuit board. I usually replace all the electrolytic capacitors, all power transistors, the RPM adjustment trimmers and relay and the sensor arm transistor and biasing resistor. It is best to start with the power transistors that are mounted on the solder side of the board. They can most easily be replaced while the board is still bolted it. This shows the original IC1 that is responsible for regulating the 21V power rail. It is usually a TIP120: </div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYDKPV-a7L797ykEreLZsJlTQW4VTbho1MJBegCUY-aJrqttMSbWPdvfka194-Y9WYETOJAmECG-Y9UHK5dRcuO9JO8Uv9uLfvJ6DAA_4FidiVxgIAaewtI8phbmOf-zq-3Bk7t5xAysOAjh13MuKTVQST-aun6Ig8rb7h6dSHDTCXCIbV7LB6oVxjGT8/s1200/20.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgYDKPV-a7L797ykEreLZsJlTQW4VTbho1MJBegCUY-aJrqttMSbWPdvfka194-Y9WYETOJAmECG-Y9UHK5dRcuO9JO8Uv9uLfvJ6DAA_4FidiVxgIAaewtI8phbmOf-zq-3Bk7t5xAysOAjh13MuKTVQST-aun6Ig8rb7h6dSHDTCXCIbV7LB6oVxjGT8/w640-h480/20.jpg" width="640" /></a></div><div style="text-align: justify;">I replaced it with a stronger TIP102. Note that these modern devices need a 100nF capacitor to GND at their output to quench some strange high frequency oscillations. Not sure why these oscillations occur, but the 100nF cap does address the issue:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgoOK7Jj-twzMk2whvO_wORTMCgVqVP6xGAsdKD4VjjsY0rn3oF-qpC-hSysLjEWO1bgUXFlQWK8eCZN30OOJ5HNPYwI_rztMjeK2mr6BaBW_9LbldoVDTGFL0MzHmjZFRf33-bWQc3_5SPaQj0uz2z8_PjZkkrwNaahUMM8MvJrZnvD3rWRNtzToOpQoo/s1200/21.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgoOK7Jj-twzMk2whvO_wORTMCgVqVP6xGAsdKD4VjjsY0rn3oF-qpC-hSysLjEWO1bgUXFlQWK8eCZN30OOJ5HNPYwI_rztMjeK2mr6BaBW_9LbldoVDTGFL0MzHmjZFRf33-bWQc3_5SPaQj0uz2z8_PjZkkrwNaahUMM8MvJrZnvD3rWRNtzToOpQoo/w640-h480/21.jpg" width="640" /></a></div><div style="text-align: justify;">After replacing IC4, it was time to take out the board:</div></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhPHF8-SkQyEseHjrslF4TnDI91EiPBcV2_Hu1QRKshIPdV4t8IiBW8fGW-vX2RdJRhVRoUg1Zf7I4OhLRBL_ezOCEzNBjhFf1U-7JNMliObK-JrulSmuG9c8QSBEmR6AOszlpEHqLxAMLycG29MhNY8VkgroduEAQMPQnrgQzgORU1YJibI-E11TISI5M/s1200/27.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhPHF8-SkQyEseHjrslF4TnDI91EiPBcV2_Hu1QRKshIPdV4t8IiBW8fGW-vX2RdJRhVRoUg1Zf7I4OhLRBL_ezOCEzNBjhFf1U-7JNMliObK-JrulSmuG9c8QSBEmR6AOszlpEHqLxAMLycG29MhNY8VkgroduEAQMPQnrgQzgORU1YJibI-E11TISI5M/w640-h480/27.jpg" width="640" /></a></div><div style="text-align: left;"></div><div style="text-align: justify;">This shows a detail shot of the 'RPM section' with the RPM trimmers and the National RPM relay:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj-i7YjonIhxaeSrMWLhZnk0FcfhoH4hMgVkUEgsCLpXBKTIaEwi387H_a0XkgMC2AmaoSGf-M6Ur_0TT4-0_px8BmEaDIBY5bevVZa9m7a-NnpuGF4PWJyd84t0XvA6AOS0hmpwo8ZdPf5HSazrov_4Z-L08NTn_oMrcwLHC-fzcFJ4wMaK0h1R40UyIA/s1200/24.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj-i7YjonIhxaeSrMWLhZnk0FcfhoH4hMgVkUEgsCLpXBKTIaEwi387H_a0XkgMC2AmaoSGf-M6Ur_0TT4-0_px8BmEaDIBY5bevVZa9m7a-NnpuGF4PWJyd84t0XvA6AOS0hmpwo8ZdPf5HSazrov_4Z-L08NTn_oMrcwLHC-fzcFJ4wMaK0h1R40UyIA/w640-h480/24.jpg" width="640" /></a></div><div style="text-align: left;"></div><div style="text-align: justify;">I did all the replacements:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEibPDuv2dsTex6SVwhqJCaUJNnriEi5nt6qPQDNg_JhttHdwQ8FSTpw1Jj2tlKTax7aDapbxkoLIr96oWzKHL2R4QGmdpaR0Li8Ou13PuhqmXU5wqsmf4CNlSVUcIFfJSxoo0ai6y2nPDjV9HjQwRBLGs9r1XT1QhECTG2hTiJSpfKAxhg7KTCi5Icg29c/s1200/29.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEibPDuv2dsTex6SVwhqJCaUJNnriEi5nt6qPQDNg_JhttHdwQ8FSTpw1Jj2tlKTax7aDapbxkoLIr96oWzKHL2R4QGmdpaR0Li8Ou13PuhqmXU5wqsmf4CNlSVUcIFfJSxoo0ai6y2nPDjV9HjQwRBLGs9r1XT1QhECTG2hTiJSpfKAxhg7KTCi5Icg29c/w640-h480/29.jpg" width="640" /></a></div><div style="text-align: left;"></div><div><div style="text-align: justify;">This shows the rebuilt RPM section with modern encapsulated 25 turn trimmers for the RPM adjustment and the Beolover relay replacement that fits into the foot print of the original National relay:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZ_ua9o8mvhlg_P9aQYXpYx_krqKcNso24YQhyphenhyphenDHMS3vHTOdBiSEm1szBqxWMB_cr3teRhIefi2yWe12oru__1_lesE67rqBFtsF94YXZwVoQdCl-eZYBahjwwJDQrkL1MhZsVRlBQLBR1ZhwWz1AaFeeNF3E5pZ5gOo5Djjvebu12Z4zuowxxekJRNGw/s1200/22.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZ_ua9o8mvhlg_P9aQYXpYx_krqKcNso24YQhyphenhyphenDHMS3vHTOdBiSEm1szBqxWMB_cr3teRhIefi2yWe12oru__1_lesE67rqBFtsF94YXZwVoQdCl-eZYBahjwwJDQrkL1MhZsVRlBQLBR1ZhwWz1AaFeeNF3E5pZ5gOo5Djjvebu12Z4zuowxxekJRNGw/w640-h480/22.jpg" width="640" /></a></div><div style="text-align: justify;">Next came the output board, which in the 4004 is comprised of two circuits: 1) on the right the output circuit that consists of the output relay and the circuitry that determines its time constant. And on the left 2) the remote control receiver that is able to communicate with a Beomaster 2400 and its remote control:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhao224xlkNxs4aSBqO09V-f-UmTrsyUSRuYkjXuakoH4tVGDBil8viGukfEDponq09EOMpgN6G9bkR35-OBawU7KdNCdNwCjFCXS8Pkzg2ebwou5zFFDpcx9BpoIUCyeh-JZJwPRY5Z1xWOQkDK-IzFckkTzbgcdLIzAch7TibkkSR87xrFuCFz5OQ3TA/s1200/25.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhao224xlkNxs4aSBqO09V-f-UmTrsyUSRuYkjXuakoH4tVGDBil8viGukfEDponq09EOMpgN6G9bkR35-OBawU7KdNCdNwCjFCXS8Pkzg2ebwou5zFFDpcx9BpoIUCyeh-JZJwPRY5Z1xWOQkDK-IzFckkTzbgcdLIzAch7TibkkSR87xrFuCFz5OQ3TA/w640-h480/25.jpg" width="640" /></a></div><div style="margin-left: 1em; margin-right: 1em; text-align: left;"></div></div><div><div style="text-align: justify;">This shows a detail shot of the output circuit:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVVRVtuUokNcUVOV92o9iBOQJbnn-6vxspgtfBH1jA2RH-hl6_XG4daFyfhwklENLiDagMuL9xO6JLDhKybtzNMc7G6iFYRqeZKThNiyFYbX9y0LFqsb5DUJhRCH85FZobe_-5u6BCn6reKPV5gNes1Xotrb-B_SkyTB73Vb1y77Yrlf-Yuac1j8gXJto/s1200/23.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVVRVtuUokNcUVOV92o9iBOQJbnn-6vxspgtfBH1jA2RH-hl6_XG4daFyfhwklENLiDagMuL9xO6JLDhKybtzNMc7G6iFYRqeZKThNiyFYbX9y0LFqsb5DUJhRCH85FZobe_-5u6BCn6reKPV5gNes1Xotrb-B_SkyTB73Vb1y77Yrlf-Yuac1j8gXJto/w640-h480/23.jpg" width="640" /></a></div><div style="text-align: justify;">I replaced all electrolytic capacitors and the relay:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7PGan3icUqZ8uQXdpJh1beW3MEP0fZljr5r_tZb-Xjtg7OtSUy-XB2jBUWGLiMSTECNc6OzCjqS9HKAuutqz_bFxna3qdEA5feJiidz8hi6t2yxMaEyUTEVbdssHSpPGCsEqE3WutXScd0hLbiXN54UB414pV6pOuJo2cOmRKeiDbLZEhcP_4QEFs8wk/s1200/28.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7PGan3icUqZ8uQXdpJh1beW3MEP0fZljr5r_tZb-Xjtg7OtSUy-XB2jBUWGLiMSTECNc6OzCjqS9HKAuutqz_bFxna3qdEA5feJiidz8hi6t2yxMaEyUTEVbdssHSpPGCsEqE3WutXScd0hLbiXN54UB414pV6pOuJo2cOmRKeiDbLZEhcP_4QEFs8wk/w640-h480/28.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the output section in more detail. I added a switch (red) that allows connecting signal and system grounds in case there is a hum (especially valuable if the Beogram is to be used with a receiver that has RCA inputs):</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWRsIYQQGWmhTsD3iCXxBW1hjFxYoyQzEsQeWNqglMAazXNwLpPgc9fZv5ww5h1r7z88gxTGXhj62RtGMKb9pKhTtP2gCEIcuOFguGcAxzRgZPH6PzPLCvIS8fflc-TyJSpbEN34Hqb0p9fKN_3M4T4jbS9nT9xL6Kk9Wwkdr2U8Z7SfOiGtkbHN-AQOU/s1200/26.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWRsIYQQGWmhTsD3iCXxBW1hjFxYoyQzEsQeWNqglMAazXNwLpPgc9fZv5ww5h1r7z88gxTGXhj62RtGMKb9pKhTtP2gCEIcuOFguGcAxzRgZPH6PzPLCvIS8fflc-TyJSpbEN34Hqb0p9fKN_3M4T4jbS9nT9xL6Kk9Wwkdr2U8Z7SfOiGtkbHN-AQOU/w640-h480/26.jpg" width="640" /></a></div><div style="text-align: justify;">After the PCBs, I removed the RPM panel to replace its incandescent light bulbs with LED assemblies. This is important since the LEDs produce less heat, which eliminates sudden RPM changes due to thermally induced movements in the trimmers. This shows the back side of the RPM panel:</div><div class="separator" style="clear: both; text-align: justify;"><br /></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtCUyh92NxYLxemUDD36JMQ3zu9K5mG1HHpHpgUQE6gcAiwbtxVu8xlvvuK0L1pEtgmWIrT12xs8dcuNDSbcbgfHpqnGj9G4lp9R0QW0IbvK9w8eXcnqo2R3U4m63mypekRcOJgUAfzuO7J7UEiI70TMf7M7A0m2sfp4CAH4PpE6l-v4D_qfxgvNqLSIk/s1200/32.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtCUyh92NxYLxemUDD36JMQ3zu9K5mG1HHpHpgUQE6gcAiwbtxVu8xlvvuK0L1pEtgmWIrT12xs8dcuNDSbcbgfHpqnGj9G4lp9R0QW0IbvK9w8eXcnqo2R3U4m63mypekRcOJgUAfzuO7J7UEiI70TMf7M7A0m2sfp4CAH4PpE6l-v4D_qfxgvNqLSIk/w640-h480/32.jpg" width="640" /></a></div><div style="margin-left: 1em; margin-right: 1em; text-align: center;"></div><div class="separator" style="clear: both; text-align: justify;">Removal of the bulb covers reveals the bulb assemblies:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNKj1E9TSA9TiHLpiG2XHHRc0o8YOwpFjbV5IkCnlYdssoOBSJsv-yDJrYCXdogeSF8GJnj9qhPMW2xlt_B8BtqkjP4-f1nk_7lGu1DOVItGSY3wy-mx65V4dR8BbIPIeZp34VdE19-bTJQ8UHwWlEOY4LL4q3UfsAM3ql3dZoRb-BuADNIU6pv0wH5Tc/s1200/34.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNKj1E9TSA9TiHLpiG2XHHRc0o8YOwpFjbV5IkCnlYdssoOBSJsv-yDJrYCXdogeSF8GJnj9qhPMW2xlt_B8BtqkjP4-f1nk_7lGu1DOVItGSY3wy-mx65V4dR8BbIPIeZp34VdE19-bTJQ8UHwWlEOY4LL4q3UfsAM3ql3dZoRb-BuADNIU6pv0wH5Tc/w640-h480/34.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">I removed the bulbs. This shows the extracted bulbs together with their LED replacements:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjMKAUJcSlVy5iqdDQGgP9kARcEoPLNf1WL5fl2qtS_deLfeeED263Vzhvd99WI-_4oSawolQx8oxUh4xBc0G6t1eu_GiZOKowNcyp-b_tC_LHwaIz6mYswK5AkHSe5lwXKBBNuwFE7XTviWhuHdGA4yToIqN9mjdxgMTVydFleU-kowg4V0SFCyJz2PjY/s1200/31.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjMKAUJcSlVy5iqdDQGgP9kARcEoPLNf1WL5fl2qtS_deLfeeED263Vzhvd99WI-_4oSawolQx8oxUh4xBc0G6t1eu_GiZOKowNcyp-b_tC_LHwaIz6mYswK5AkHSe5lwXKBBNuwFE7XTviWhuHdGA4yToIqN9mjdxgMTVydFleU-kowg4V0SFCyJz2PjY/w640-h480/31.jpg" width="640" /></a></div><div style="margin-left: 1em; margin-right: 1em; text-align: left;"></div></div><div><div style="text-align: justify;">I soldered the LED boards in. They directly connect to the bulb terminals:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjrG9gLC2d0e5WQYFTHRRHJY42dozmW9XsHK0uSmOpwmt7cYa6zpR0K9H_qMiTGGqRVortz-tjV4lNMJj9FoUzhDf8akFVSmWWusMItkrnHRicbesR_FLgObpXZamxQZbyPT93OyV0PQdXOF_lXqAhKCokyut-qjFy2sLxTSogz9x4V3LBWM7RSIRtIQuM/s1200/30.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjrG9gLC2d0e5WQYFTHRRHJY42dozmW9XsHK0uSmOpwmt7cYa6zpR0K9H_qMiTGGqRVortz-tjV4lNMJj9FoUzhDf8akFVSmWWusMItkrnHRicbesR_FLgObpXZamxQZbyPT93OyV0PQdXOF_lXqAhKCokyut-qjFy2sLxTSogz9x4V3LBWM7RSIRtIQuM/w640-h480/30.jpg" width="640" /></a></div><div style="text-align: justify;">Here is a detail shot of one of them:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgY5hSf6kzu2k90_7TtM84GYFrkowhg4anZ-lhJ34Nxx_7gkGPAtK_9nxgsXoOExc2yjfYc5hzp5fT113tdS70ez9zPqoSmjvXoZb5VTsF1YD14CBMTI-TDWY0aorouKwqK06_v1bmZVlrhBZC3X86XAeqIhxHfL9B8m8ZY3ncqvSNVopvkZ58xC4awI_A/s1200/35.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgY5hSf6kzu2k90_7TtM84GYFrkowhg4anZ-lhJ34Nxx_7gkGPAtK_9nxgsXoOExc2yjfYc5hzp5fT113tdS70ez9zPqoSmjvXoZb5VTsF1YD14CBMTI-TDWY0aorouKwqK06_v1bmZVlrhBZC3X86XAeqIhxHfL9B8m8ZY3ncqvSNVopvkZ58xC4awI_A/w640-h480/35.jpg" width="640" /></a></div><div style="text-align: justify;">After the exchange the bulb covers can be re-installed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihLWWDgW-kRKnRwW8PdaEMsAhRaYAVa3mnvZqftpASdANeO7nsV-QMnB3lEE28HK5D29_7JP6NDlr5BYounqVpHVlftEzQ7mY6XkeqHpDyvXnbiQfZa_aRWhSLzedaNg05U4gl4-QWCXsP8VdHtKBCGY-JoeWzKF5WVPj6BvJbWRVBqIe_tLunInZaPxk/s1200/33.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEihLWWDgW-kRKnRwW8PdaEMsAhRaYAVa3mnvZqftpASdANeO7nsV-QMnB3lEE28HK5D29_7JP6NDlr5BYounqVpHVlftEzQ7mY6XkeqHpDyvXnbiQfZa_aRWhSLzedaNg05U4gl4-QWCXsP8VdHtKBCGY-JoeWzKF5WVPj6BvJbWRVBqIe_tLunInZaPxk/w640-h480/33.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">After this step it was time to remove the floating chassis from the enclosure to replace the degraded transport lock bushings. This shows one of the degraded bushings:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgd8JfLX4M_brgEUQddnmFSWDYyce-SCszdqpRc0QXEbl6jMvdzv2y3AoIwUp1KImggMpTcMYP7Yb5bRrw0OIfQVcRRFNSvwubhNZctxO26W6qPzOYhW8YfFJOAh2D2YuquDx2esKQOpZn9ppoHcpA7QTK34OBUyA6OyoB0acF-EuLxE7IRVP2yGjjzJgg/s1200/36.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgd8JfLX4M_brgEUQddnmFSWDYyce-SCszdqpRc0QXEbl6jMvdzv2y3AoIwUp1KImggMpTcMYP7Yb5bRrw0OIfQVcRRFNSvwubhNZctxO26W6qPzOYhW8YfFJOAh2D2YuquDx2esKQOpZn9ppoHcpA7QTK34OBUyA6OyoB0acF-EuLxE7IRVP2yGjjzJgg/w640-h480/36.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the enclosure after removing everything and vacuuming out all the bushing fragments:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjf4JIjWERJRBZv3VeLLxAo2JcNvvXahCYVfziJOMREuIxEX4XgHQpO0Us6dpjGaB4U0Sa3w2024RvLHNWmunq1yrxl_nPSx5-FDcikCP5zAjHAly_R5QRWX-HGkBerlZp6nui2ZWxZoUzc6eafbbhE4K2GicZQihkDiaYTDyMoAxp34TAv2-QKqucEgA/s1200/37.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjf4JIjWERJRBZv3VeLLxAo2JcNvvXahCYVfziJOMREuIxEX4XgHQpO0Us6dpjGaB4U0Sa3w2024RvLHNWmunq1yrxl_nPSx5-FDcikCP5zAjHAly_R5QRWX-HGkBerlZp6nui2ZWxZoUzc6eafbbhE4K2GicZQihkDiaYTDyMoAxp34TAv2-QKqucEgA/w640-h480/37.jpg" width="640" /></a></div><div style="text-align: justify;">Now it was time to install the new transport lock bushings in the floating chassis. The Beolover replacement bushings are printed from a resilient nylon material. Their design is based on two identical halves, that can easily be installed by pushing in one half from the bottom and the other from the top:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhE3Y-MAwy-yc8MFJv_cpCk48T7EsI9puxA0cn7C6I1jJL-1XSLnButekgE69Iz65yaJhuOxm0cH5_smCEf51mrlKochxLz2OgXN7O3YlrYSoCq83ac9upTgYTYaN8dSFWzfESO1fHpx1i2dhHQW9Xmx5n_-wJLXGWaBjsi1wQRI4aIKgFusFNqVC_9Mec/s1200/38.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhE3Y-MAwy-yc8MFJv_cpCk48T7EsI9puxA0cn7C6I1jJL-1XSLnButekgE69Iz65yaJhuOxm0cH5_smCEf51mrlKochxLz2OgXN7O3YlrYSoCq83ac9upTgYTYaN8dSFWzfESO1fHpx1i2dhHQW9Xmx5n_-wJLXGWaBjsi1wQRI4aIKgFusFNqVC_9Mec/w640-h480/38.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the installation process: First the lower half is pushed into the orifice</div></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7HYH8cI_Tpap-ZWFn_t94uWFBvgfwQhxnk7wbegLDYsf_xlWaSYDR1cXd8FVxTzb7nBifU1RPVGmmMnJqI0ljmDbTJJRsN06ao_nf1rcdEAHry-XK6fJiAD_mPGmz-5B_h4y4XIlvehQQPOF9z61BOXMRj3aHOHtuDM8ta9f2FtabrVqgDBzDSEE-A5g/s1200/40.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7HYH8cI_Tpap-ZWFn_t94uWFBvgfwQhxnk7wbegLDYsf_xlWaSYDR1cXd8FVxTzb7nBifU1RPVGmmMnJqI0ljmDbTJJRsN06ao_nf1rcdEAHry-XK6fJiAD_mPGmz-5B_h4y4XIlvehQQPOF9z61BOXMRj3aHOHtuDM8ta9f2FtabrVqgDBzDSEE-A5g/w640-h480/40.jpg" width="640" /></a></div><div style="text-align: left;"></div><div style="text-align: justify;">and then the top half is added:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBuQaeEI6H6cvYsQ39fRSsM7Lwg1zUQuoNyWFVRHGKN0hgYvlNG8OCyTS2wZzvEJzpdABsTyAHR2mHUtFU4qZhDv5MbkSwecx8C7bpLgEwKK4Bmhpxkv-4lg4Au72mX2yAipLQMwhrbUDnZbuiKJJ4fEqkk4r4fT2u3hRHCMUl7GcVa5XXH-hj95P4WRU/s1200/41.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBuQaeEI6H6cvYsQ39fRSsM7Lwg1zUQuoNyWFVRHGKN0hgYvlNG8OCyTS2wZzvEJzpdABsTyAHR2mHUtFU4qZhDv5MbkSwecx8C7bpLgEwKK4Bmhpxkv-4lg4Au72mX2yAipLQMwhrbUDnZbuiKJJ4fEqkk4r4fT2u3hRHCMUl7GcVa5XXH-hj95P4WRU/w640-h480/41.jpg" width="640" /></a></div><div style="text-align: left;"></div><div><div style="text-align: justify;">After repeating this process for the other two locks I reinstalled the chassis. This shows one of the bushings with the lock screw in the center:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjrIAOFTOC7gdqIXcI1uVOlZRx-ZdIau5qNiFkTn8sUk1EY5-iXTnuC9RCt5m-I0wT9evRFY7eJX1kumXf6teKYVzinLQmNR3XD7IoOSom8fL0z_kgxfSXmKzPbG9eFJgTDDC12eBKOpWp8WE4YdphgC3OxkxX8lMIl2JVpf2LQSyn0C8sq2x9r26w0MuY/s1200/39.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjrIAOFTOC7gdqIXcI1uVOlZRx-ZdIau5qNiFkTn8sUk1EY5-iXTnuC9RCt5m-I0wT9evRFY7eJX1kumXf6teKYVzinLQmNR3XD7IoOSom8fL0z_kgxfSXmKzPbG9eFJgTDDC12eBKOpWp8WE4YdphgC3OxkxX8lMIl2JVpf2LQSyn0C8sq2x9r26w0MuY/w640-h480/39.jpg" width="640" /></a></div><div style="text-align: justify;">I also installed a new reservoir capacitor:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjpj2UPoRGAO4emFRynVRDNNNadOeQKpCDl0kU_9fvp9fQGTfQxNG20DZrLha1TlebGZt1RmOj0IRktELi_5Z1GJv6_pZcbHSSL3YTHdSRkR7xTrwT5SSF7iAJXDqWJTt49cBQJPYXbyabCmWrE89tabYU37Ghz5Y863O_5legjFDsD3DpcMhBIcbDJQnI/s1200/42.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjpj2UPoRGAO4emFRynVRDNNNadOeQKpCDl0kU_9fvp9fQGTfQxNG20DZrLha1TlebGZt1RmOj0IRktELi_5Z1GJv6_pZcbHSSL3YTHdSRkR7xTrwT5SSF7iAJXDqWJTt49cBQJPYXbyabCmWrE89tabYU37Ghz5Y863O_5legjFDsD3DpcMhBIcbDJQnI/w640-h480/42.jpg" width="640" /></a></div><div style="text-align: justify;">After everything was put together, it was time to adjustment the sensor arm transistor to produce 4V at its collector. This was done with the 5MOhm trimmer that I installed to replace its fixed value 1MOhm biasing resistor:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVwgpCgAsW3vvV5FuAim98JJI-wGDAgvG1E846i_voKJ4aPPYgLogvRW-i5AHCzjUyzI9CqbinKX9gagI5kj0PCRj32YtDzgIFkJo7zYq4F8S4YZRB1KFZy8cID2PAQ_ZRAy6oXcLHsZKu0vkUt81J6Nc_TbgAnQ7-NfBiMa5YlLvmrASHzcjHDX1i_nM/s1200/43.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVwgpCgAsW3vvV5FuAim98JJI-wGDAgvG1E846i_voKJ4aPPYgLogvRW-i5AHCzjUyzI9CqbinKX9gagI5kj0PCRj32YtDzgIFkJo7zYq4F8S4YZRB1KFZy8cID2PAQ_ZRAy6oXcLHsZKu0vkUt81J6Nc_TbgAnQ7-NfBiMa5YlLvmrASHzcjHDX1i_nM/w640-h480/43.jpg" width="640" /></a></div><div style="text-align: justify;">Then it was time to replace the last incandescent bulb, which is located in the sensor arm. This shows the sensor compartment pulled out, which reveals the bulb. Next to it on the white cloth is the replacement assembly:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLTMitbYQubpacZBkuAmyydyGDXuKR-YLupO3qR6xQBB2wM4tmlUJ6pdimKFmcIdMw-6iaE1EJDhpijeyL7WXqKIG39RSndSa-2QRjGcY4GnPzF38qicjh2fjJpdizpkQGMoMCF96qh8bQ7DJOKzbVbDsvWe6nr5EIamTR_JAkDsbj534INfwHnJFgJAc/s1200/44.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLTMitbYQubpacZBkuAmyydyGDXuKR-YLupO3qR6xQBB2wM4tmlUJ6pdimKFmcIdMw-6iaE1EJDhpijeyL7WXqKIG39RSndSa-2QRjGcY4GnPzF38qicjh2fjJpdizpkQGMoMCF96qh8bQ7DJOKzbVbDsvWe6nr5EIamTR_JAkDsbj534INfwHnJFgJAc/w640-h480/44.jpg" width="640" /></a></div><div style="text-align: justify;">I installed the LED board:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjv3Bnobbd971Nn4fWdGraTNfGLdccKz3tiz5mBRCQ3YuPvZsJeSRAgT3KpB4AcWNnKOnZ7idVThW5gUrQj0VzdfTTO0qesqvaMo6jWvAJoa-Ue0EcvdkEDyWge_wvW2z8qbrq_HzCi1to9ZAGRVENChaIjIU192n3At1GDvNoCH42ugfNtvKXsXD1OXXk/s1200/45.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjv3Bnobbd971Nn4fWdGraTNfGLdccKz3tiz5mBRCQ3YuPvZsJeSRAgT3KpB4AcWNnKOnZ7idVThW5gUrQj0VzdfTTO0qesqvaMo6jWvAJoa-Ue0EcvdkEDyWge_wvW2z8qbrq_HzCi1to9ZAGRVENChaIjIU192n3At1GDvNoCH42ugfNtvKXsXD1OXXk/w640-h480/45.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the LED in action:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiimwpoRSWlYXiTXiEAYXeA90j0Utre_6J7jovSygaBB7WB-bPUe9T-oth1U-d-dgQrW2hH1IYqZv8Xw0H6CINbquRVlxvYIKZjgJybfVlE4HDLiXf_e3l3E6HcqoF1LhT6eqzXhcNKDYcjmP_WeebNDiK1wMo0bqf3FFxFVJqOQyBzR_FIW7G3aJGyUTA/s1200/46.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiimwpoRSWlYXiTXiEAYXeA90j0Utre_6J7jovSygaBB7WB-bPUe9T-oth1U-d-dgQrW2hH1IYqZv8Xw0H6CINbquRVlxvYIKZjgJybfVlE4HDLiXf_e3l3E6HcqoF1LhT6eqzXhcNKDYcjmP_WeebNDiK1wMo0bqf3FFxFVJqOQyBzR_FIW7G3aJGyUTA/w640-h480/46.jpg" width="640" /></a></div><div style="text-align: justify;">It is a warm white LED, which produces enough red photons to properly illuminate the red B&O logo.</div></div><div style="text-align: justify;">Now it was time for the mechanical adjustments. The first step is always to adjust the platter/arm distance, make sure that the platter is level, and then adjust the floating chassis that the platter is flush with the surrounding aluminum panels. This can be a tedious process that requires a few iterations. Then the remaining adjustments can be made:</div><div style="text-align: justify;">First I focused on calibrating the tracking weight. This shows the standard B&O setup of the counterweight adjustment mechanism: The screw that adjusts the weight position is held in place with a circlip and some glue:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhizDH2rwWF3CSazByJkA3-oYP9IuqlEl3mUa9CJEaDuxQVQcVClVc5RBjeSfKEoEZHH0HSa96A2S0l2EnPmuxubpiADbM72s-q7PxqL6DtCpJ1QFhI0FnLs2Z1VbxVViURJI_Fz0zpQYf1RjMGY0DPJwWwiX-fHNKNqvknd9FedZ9bNg3_FfAuP7qkEc/s1200/48.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhizDH2rwWF3CSazByJkA3-oYP9IuqlEl3mUa9CJEaDuxQVQcVClVc5RBjeSfKEoEZHH0HSa96A2S0l2EnPmuxubpiADbM72s-q7PxqL6DtCpJ1QFhI0FnLs2Z1VbxVViURJI_Fz0zpQYf1RjMGY0DPJwWwiX-fHNKNqvknd9FedZ9bNg3_FfAuP7qkEc/w640-h480/48.jpg" width="640" /></a></div><div style="text-align: left;"></div><div><div style="text-align: justify;">I do not particularly like this setup since it can still shift during transport. I usually replace the circlip with a M3 nut that can be tightened:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgRcm8KWjL7iULTPJL-_nKSxNfaOP-bc6kqD83HPT2V-3sHCzQlQxyNSFnW16TatZ7fa3czEkGacwssfTcI_8mYLLkb5HJTjlLXb6aHieNAT05nx6YfSsThpZPhUUecFbGVvjvVoLv8i442LwsO_pvp5RQsiTeFTZwyTN7dKwarJ2bP0EuWNJ8HJThjT-I/s1200/47.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgRcm8KWjL7iULTPJL-_nKSxNfaOP-bc6kqD83HPT2V-3sHCzQlQxyNSFnW16TatZ7fa3czEkGacwssfTcI_8mYLLkb5HJTjlLXb6aHieNAT05nx6YfSsThpZPhUUecFbGVvjvVoLv8i442LwsO_pvp5RQsiTeFTZwyTN7dKwarJ2bP0EuWNJ8HJThjT-I/w640-h480/47.jpg" width="640" /></a></div><div style="text-align: justify;">This makes the calibration resilient to the stresses during shipping. This shows the tracking weight measurement after calibration with the weight dial set to 1.2g:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiNfPCDFHG23tqw9EICdLsic4yQtjRxQElqjZui5qGV59hBlUhus7FbRrWfsvfZyJcUC1fLmRDe1wwSM2yxkRkj7CaWL98T53bPwkj5AenEamGiIQ-X4UtVapxVCqfbj9TvOvsaEY-te2uZT5ZDdGNqrNaaZKhbeMOaCHM1y0cEQxrn-BzKuQtNNje3FWs/s1200/49.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiNfPCDFHG23tqw9EICdLsic4yQtjRxQElqjZui5qGV59hBlUhus7FbRrWfsvfZyJcUC1fLmRDe1wwSM2yxkRkj7CaWL98T53bPwkj5AenEamGiIQ-X4UtVapxVCqfbj9TvOvsaEY-te2uZT5ZDdGNqrNaaZKhbeMOaCHM1y0cEQxrn-BzKuQtNNje3FWs/w640-h480/49.jpg" width="640" /></a></div><div style="text-align: justify;">Another important adjustment is the arm lowering limit. It needs to be set that the needle misses the lower parts of the platter ribs when the arm is lowered. The manual prescribes a 1mm gap:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyEEZLQI0MMGdFgpofxMxaYclinX0QmbURvil4-1aUh1lqqaP-mHV4d988lP8zZeXbPFbqQ8dOtgdm_U3ZPuWHt2WyAbvmpWInFYLivyRnffVyzdnEX7S3AIV2t5rM41UDO0AB0CWCnv2fk0S6h5eGdMuVo7zDeV22T3PEJnGek-cUfFIdPp4X_XM27-k/s1200/50.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyEEZLQI0MMGdFgpofxMxaYclinX0QmbURvil4-1aUh1lqqaP-mHV4d988lP8zZeXbPFbqQ8dOtgdm_U3ZPuWHt2WyAbvmpWInFYLivyRnffVyzdnEX7S3AIV2t5rM41UDO0AB0CWCnv2fk0S6h5eGdMuVo7zDeV22T3PEJnGek-cUfFIdPp4X_XM27-k/w640-h480/50.jpg" width="640" /></a></div><div style="text-align: justify;">This ensures that the needle does not get damaged should the arm ever be lowered on an empty platter due to a circuit malfunction. The final adjustment was the tracking feedback:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjcIhgHiox2fAyGUjGlc2LvSnevID7Fs4hwnEBBOIrBAXyofumMFIjahV_0opmqZN_VZMVSHcnP2ap3FwdyeTY3O4M_hS32EZ0McQMlOXwij1jhngxV80-0qpU7D3K9XH95yZ60cq3SsaRPkd-GXrFhpQMk8RNxApa14McaYZFDdCSarSNUkzkAJfeIx-Y/s1200/51.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjcIhgHiox2fAyGUjGlc2LvSnevID7Fs4hwnEBBOIrBAXyofumMFIjahV_0opmqZN_VZMVSHcnP2ap3FwdyeTY3O4M_hS32EZ0McQMlOXwij1jhngxV80-0qpU7D3K9XH95yZ60cq3SsaRPkd-GXrFhpQMk8RNxApa14McaYZFDdCSarSNUkzkAJfeIx-Y/w640-h480/51.jpg" width="640" /></a></div><div style="text-align: justify;">In the meantime the oil infusion of the bearings had completed. I extracted the bearings from the oil:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh11G2Yiw1TwBvxsZDA5lXB9pZJnuimPVcUnEGFET-MR3EjjLpHTBocoYSmwQBqY5xUmrPyRxqoQRfv0u_etJjNTCekLrMqC_dnIhjHICCVrmhgDBxACM4ZXxvawzSrCqxxt72cQhUixx-w8Te2svcpwqYkmOs_OTIkcKsUGKyjl8TahmxGHS83LOeoXa4/s1200/52.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh11G2Yiw1TwBvxsZDA5lXB9pZJnuimPVcUnEGFET-MR3EjjLpHTBocoYSmwQBqY5xUmrPyRxqoQRfv0u_etJjNTCekLrMqC_dnIhjHICCVrmhgDBxACM4ZXxvawzSrCqxxt72cQhUixx-w8Te2svcpwqYkmOs_OTIkcKsUGKyjl8TahmxGHS83LOeoXa4/w640-h480/52.jpg" width="640" /></a></div><div style="text-align: justify;">Then I re-assembled the motor and installed it in the Beogram for a RPM stability test with my Beolover RPM device:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOeO7731oyiLM8ygE245synhQwlnAV4bNeqzWGhE1canel6fPR0jgpRr149yW3EtZS7R9O7MvDKwVCrevm7_sqAaGkcwEm6AkiQ5qSzduHLol4en6ngHffHCbo04HhBsHlXBZjDOQcjaVaG69L8RzJFwrjbz3HckT5pljl-UpFRDyRa1_7_i4FMLb5yy4/s1200/53.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOeO7731oyiLM8ygE245synhQwlnAV4bNeqzWGhE1canel6fPR0jgpRr149yW3EtZS7R9O7MvDKwVCrevm7_sqAaGkcwEm6AkiQ5qSzduHLol4en6ngHffHCbo04HhBsHlXBZjDOQcjaVaG69L8RzJFwrjbz3HckT5pljl-UpFRDyRa1_7_i4FMLb5yy4/w640-h480/53.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">Aside from precise RPM adjustments, this device allows logging the RPM in 10s intervals over long periods of time. The blue curve in the graph below is what I got after about 24 hrs. Not very beolovely, to say the least. The strong RPM drops after maybe 15 hours are indicative of a failure of at least one of the spark snubbers that are soldered to the rotor.</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0dF1iuAvjWValxYb0yQ6NDrqtnadIw0MUVtjioj09yHQq6-Lmwui1H7lMfCBRuXYUxPZN6gSlv8YX8KzZoplFSrHwvruKRH_zlyV3XTADQdxcLMj5yJ74uB5jvhC_mSxY8NYTzflZUZ108UVJNFfBZSG663fY-hGN527trPI1w3lVxCzJKrXuMsNL2OY/s1231/Beogram%204004%20RPM%20stability.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="850" data-original-width="1231" height="442" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0dF1iuAvjWValxYb0yQ6NDrqtnadIw0MUVtjioj09yHQq6-Lmwui1H7lMfCBRuXYUxPZN6gSlv8YX8KzZoplFSrHwvruKRH_zlyV3XTADQdxcLMj5yJ74uB5jvhC_mSxY8NYTzflZUZ108UVJNFfBZSG663fY-hGN527trPI1w3lVxCzJKrXuMsNL2OY/w640-h442/Beogram%204004%20RPM%20stability.jpg" width="640" /></a></div></div><div><div style="text-align: justify;">So I extracted the motor again and took it apart a second time. This shows the rotor from the commutator end:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjTzE5Z0y214F7n__aXOGoglKksSw2U8HI5GS_VmjWS799VBkAdH_Vbg852T9_Q84269mU_IVcqp6OrMMuSXGNhPg5PjwILGCKPpZwL3QbEOz84RO4KxwwBbZzb6o3xnNFJ7qNIl6EiFF0IQJgIlQgwdMagODnT6tSvkbprUU6ybGPa0wzPRmfQgg8dcys/s1200/54.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjTzE5Z0y214F7n__aXOGoglKksSw2U8HI5GS_VmjWS799VBkAdH_Vbg852T9_Q84269mU_IVcqp6OrMMuSXGNhPg5PjwILGCKPpZwL3QbEOz84RO4KxwwBbZzb6o3xnNFJ7qNIl6EiFF0IQJgIlQgwdMagODnT6tSvkbprUU6ybGPa0wzPRmfQgg8dcys/w640-h480/54.jpg" width="640" /></a></div><div style="text-align: justify;">The yellowish devices are the spark snubbers that are soldered between the pole terminals of the windings. This shows the original snubber after extraction next to their modern replacements:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiUbgOafODN9fr3BJs433KAfnmjnjqG0FhbtlFbad2ZkoFkU7g4KK1JSiVQtkSaPAR_oV4zYp-h7J-VYly7z1YcF9P37ude2dgohKQkGlEIFSGjDK6QDS8N7ZZOpoxzHmOVgzkMLOH3RHcLZm_0g-JJf1jBFNK2ozIgagZc45x_dgshWRcKhBT-35pGMpY/s1200/55.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiUbgOafODN9fr3BJs433KAfnmjnjqG0FhbtlFbad2ZkoFkU7g4KK1JSiVQtkSaPAR_oV4zYp-h7J-VYly7z1YcF9P37ude2dgohKQkGlEIFSGjDK6QDS8N7ZZOpoxzHmOVgzkMLOH3RHcLZm_0g-JJf1jBFNK2ozIgagZc45x_dgshWRcKhBT-35pGMpY/w640-h480/55.jpg" width="640" /></a></div><div style="text-align: justify;">I soldered the new snubbers between the terminals:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi44wlSR4qHnnZCSqoXQqm3Psu__5dVsHWSDmBNfjOCGFT-mkYINfuxGWWMHDZYAsGZbnQCzJl7JBDMXYr0sgSIZ2w8O4iibMHPH6ogNDGSHHPhNjdD1TFnc4-ameyUIT-WPk0W_57adX-_dwBr0R6GQrgoRJaV0Ex37v-k29tIhO8JTxxtX530mGPwC_4/s1200/56.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi44wlSR4qHnnZCSqoXQqm3Psu__5dVsHWSDmBNfjOCGFT-mkYINfuxGWWMHDZYAsGZbnQCzJl7JBDMXYr0sgSIZ2w8O4iibMHPH6ogNDGSHHPhNjdD1TFnc4-ameyUIT-WPk0W_57adX-_dwBr0R6GQrgoRJaV0Ex37v-k29tIhO8JTxxtX530mGPwC_4/w640-h480/56.jpg" width="640" /></a></div><div style="text-align: justify;">Then I put the motor back into the Beogram and did a second measurement. The red curve resulted after 24 hrs. It appears the new snubbers cured the RPM drop issues.</div></div><div style="text-align: justify;"><br /></div><div><div style="text-align: justify;">On to fixing the messy output cable situation. This shows the setup in place when I received the unit. someone 'converted' the original DIN plug to a makeshift RCA setup. Since DIN cables are typically not setup to be used as RCA cables this looked a bit improvised:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6xUuRLerlf8OQO_OmtZ-vWySCNBiUbUj65fY4ZsgLJwFeumI1qpNz8jbFeYEJKN3ksksxtVXdHHM0Q9Ka-jIjH-zQooa69fKF3tRt1XRjLAx-ltg9AxrW_3RbVjag6Af_uZEGQJztQ5MMqfa5UIteyTk3pj3Iv-iobp2EAcB7k9ZbwViPLYKWbdlDfeg/s1200/57.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6xUuRLerlf8OQO_OmtZ-vWySCNBiUbUj65fY4ZsgLJwFeumI1qpNz8jbFeYEJKN3ksksxtVXdHHM0Q9Ka-jIjH-zQooa69fKF3tRt1XRjLAx-ltg9AxrW_3RbVjag6Af_uZEGQJztQ5MMqfa5UIteyTk3pj3Iv-iobp2EAcB7k9ZbwViPLYKWbdlDfeg/w640-h480/57.jpg" width="640" /></a></div><div style="text-align: justify;">I cut the cable off and installed a female DIN7 jack, essentially restoring the original convertible DIN7 configuration:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhX0snpeDmHkkzMQb2pjWLU-v0hbmvMWk3DqbTv_DvQpxMEbtnohvd-mOMii_FFphiYgbndPNNeswNRd1_CZxCAcIBMonEBQ6F_Gq5FsKQXEtPgGHJL3AM7YO4HzhjBgAGi_ziNTsi_e0AcQwekGdiqs3PKlo_8ff94voaZiBpBcJ5QlqJOqel9TKLxKr4/s1200/58.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhX0snpeDmHkkzMQb2pjWLU-v0hbmvMWk3DqbTv_DvQpxMEbtnohvd-mOMii_FFphiYgbndPNNeswNRd1_CZxCAcIBMonEBQ6F_Gq5FsKQXEtPgGHJL3AM7YO4HzhjBgAGi_ziNTsi_e0AcQwekGdiqs3PKlo_8ff94voaZiBpBcJ5QlqJOqel9TKLxKr4/w640-h480/58.jpg" width="640" /></a></div><div style="text-align: justify;">This basically matches the situation encountered in the later Beogram 8000x series, where they installed a DIN7 jack in the back of the enclosure. The 4004 does not have a suitable cutout that can be used, so the jack has to be mounted on the cable.</div><div style="text-align: justify;">Why does the Beogram 4004 need a DIN7 output configuration in the first place? It is the first B&O device that had an integrated control interface, an early Beolink if you will. The 4004 could be controlled from a Beogram 2400, which was able to automatically start the turntable when phono was selected. Also its remote control was able to pause and re-start playback. This was possible by using the additional two pins on the DIN7 as data lines transmitting the remote control signals, while maintaining a standard DIN5 output configuration on the 5 'normal' pins. </div></div><div style="text-align: justify;">Installing a female DIN7 allows connecting to a Beomaster 2400 with a male-to-male DIN7 jumper, or to a standard DIN5 input with a male-to-male DIN5 jumper, or even to RCA inputs by using a standard male DIN5-to-RCA adapter.</div><div><div style="text-align: justify;">This shows the DIN5 variant:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhlmBHZtyZSnj6xlI-YU977VbfXZYTO12AUbmWrDGySWJcEoblxrr8ln_DZf1gfdDP_-HYWpbrMytPMcHl6Dfl8D30AMidkYZBsyP95OSsK6toViV7NZ4otkM_XWHGI90D7_2sVrXksqP85qFeOV8i6ZVn-Zq98TAGyIQv19EBfKsKwTJgzsFyprTOGf1M/s1200/59.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhlmBHZtyZSnj6xlI-YU977VbfXZYTO12AUbmWrDGySWJcEoblxrr8ln_DZf1gfdDP_-HYWpbrMytPMcHl6Dfl8D30AMidkYZBsyP95OSsK6toViV7NZ4otkM_XWHGI90D7_2sVrXksqP85qFeOV8i6ZVn-Zq98TAGyIQv19EBfKsKwTJgzsFyprTOGf1M/w640-h480/59.jpg" width="640" /></a></div><div style="text-align: justify;">While working on the cable, I noticed that the plexiglass tab that holds the output cable in place inside the Beogram had cracked off from the circuit board mounting tab:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrfQ9Rt2gzNl6ug9jqgYqGhHBfFHukawBlQjDK3XpMIvKEkaQyDxBGYN_rsNR8vU4bSH-IMJHsRKPF2tt1nfJFXXj4pTjeiNwK9GZrVlqH0tdTh9WBvsKIiDbecf4VU3Z4FHD9vNQXFMzcXGqw76EE4FUoqgxW-btOae_pKiQiSi2f2CuHTAJ9yOYw010/s1200/60.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrfQ9Rt2gzNl6ug9jqgYqGhHBfFHukawBlQjDK3XpMIvKEkaQyDxBGYN_rsNR8vU4bSH-IMJHsRKPF2tt1nfJFXXj4pTjeiNwK9GZrVlqH0tdTh9WBvsKIiDbecf4VU3Z4FHD9vNQXFMzcXGqw76EE4FUoqgxW-btOae_pKiQiSi2f2CuHTAJ9yOYw010/w640-h480/60.jpg" width="640" /></a></div><div style="text-align: justify;">Since this happens fairly frequently due to the weak design of the plexiglass part, there is a Beolover replacement part available. This shows original and new together:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh86_mzRbjOM6DyPH3fiv57dU6pC_NGFb_9QURzicMMFSss-qnScunuVEHPta4fX41mpibAY_kTG0-_CpcBnpwYOXI1YvFUO_n3xacFdR9xJuNtFfB_5YBfJPE-Gt3L8axPKjVpJl8zXRols_Dx6zTmFNtldqqPBbv2NawjYu_99PNmQxjLSUVfr1GM8LQ/s1200/61.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh86_mzRbjOM6DyPH3fiv57dU6pC_NGFb_9QURzicMMFSss-qnScunuVEHPta4fX41mpibAY_kTG0-_CpcBnpwYOXI1YvFUO_n3xacFdR9xJuNtFfB_5YBfJPE-Gt3L8axPKjVpJl8zXRols_Dx6zTmFNtldqqPBbv2NawjYu_99PNmQxjLSUVfr1GM8LQ/w640-h480/61.jpg" width="640" /></a></div><div style="text-align: justify;">And the new part installed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmlB6IadPR2Nw0AEQgSi8v2EYFymdIr15kSbGVWEA4Mh8lgPgU2aAje2KWG5rQcuKfYvXs55xVjAhFKhfLtPcksOUQO1AenPT2aeQs6XwZVlOwtDVQcjp3r4IOKnEA8BDpQpmmCpVp9jdQo4Dtc4u2wJS8RzBo4gyrIpktaph7A7Vta5KbzVdOLLIoN-U/s1200/62.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmlB6IadPR2Nw0AEQgSi8v2EYFymdIr15kSbGVWEA4Mh8lgPgU2aAje2KWG5rQcuKfYvXs55xVjAhFKhfLtPcksOUQO1AenPT2aeQs6XwZVlOwtDVQcjp3r4IOKnEA8BDpQpmmCpVp9jdQo4Dtc4u2wJS8RzBo4gyrIpktaph7A7Vta5KbzVdOLLIoN-U/w640-h480/62.jpg" width="640" /></a></div><div style="text-align: justify;">The final step was the installation of a <a href="https://beolover.blogspot.com/p/beogram-4002-remote-control.html" target="_blank">Beolover Commander remote control system</a>:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijQMzgDGZahMiLSsItR7WyvZvMvnVFVs6wzV_nRheTuvqGF4Om0Rlj7b7_HScn8BSKAIEHqq9HApsEKMREfdQT4ysyAeDhs8a7Lqr_Q-xxDnM9DkVRxX6gk7LEyj5uTWO0BlbUXYAQEIAiFcoeYYmXIjw_4rdRAtusn6FJTEENR6Tzma80nPtloiWIwQ4/s1200/63.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEijQMzgDGZahMiLSsItR7WyvZvMvnVFVs6wzV_nRheTuvqGF4Om0Rlj7b7_HScn8BSKAIEHqq9HApsEKMREfdQT4ysyAeDhs8a7Lqr_Q-xxDnM9DkVRxX6gk7LEyj5uTWO0BlbUXYAQEIAiFcoeYYmXIjw_4rdRAtusn6FJTEENR6Tzma80nPtloiWIwQ4/w640-h480/63.jpg" width="640" /></a></div><div style="text-align: justify;">The Commander is the perfect way to preserve the keypad and make sure it does not degrade further. The keypads are coated with a clear coat that wears off over time due to friction and chemical reaction with the oils and fats present on skin. The Commander allows complete control of the deck via a paired Apple Remote control without ever needing to touch the keypad. It also gives the Beogram autorepeat functionality as well as a dynamic scanning function.</div></div><div style="text-align: justify;">And now it was finally time to give this restored Beogram a first spin. I selected one of my favorite albums of all time, "Pharaoh" by Pharaoh Sanders. He recorded this wonderful record in 1977 and then it was not available anymore on vinyl for a long time. And finally 2023 came around and it was finally re-issued in a beautiful box (<a href="https://www.discogs.com/release/28321105-Pharoah-Sanders-Pharoah" target="_blank">Luaka Bop 6 80899 8008-2-2</a>) together with a second record containing two really interesting life recordings of the main track 'Harvest Time'. Absolutely awesome! A perfect album to play on this Beogram 4004, which may have been purchased one or two years after this record was first released!</div><div><div style="text-align: justify;">Of course this album was thoroughly cleaned from pressing residues on a <a href="https://www.cleanervinyl.com/proxl.html" target="_blank">CleanerVinyl ProXL</a> ultrasonic record cleaner using a UC-3360 multi-frequency cleaner. Removal of chemical contamination is done best at higher ultrasonic frequencies, i.e. the 120kHz setting of the UC-3360 is perfect for that. </div><div style="text-align: justify;">Beautiful!:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgRcRgHO2D2RjB0IBumrq-tY67J5BXtvi_Ziol-RKZRmjmW9-UdxlJRXsQD1ie-QD2o2Xesz8lKF6cKDsTHItqgOlbMTOWvLjpBtfxI_jiL15g0RvrLwSnRg9qW-N8fe_vR1GZXL1MMztK8cSBXrD4EjTy-3OocIdnE_R05eNL5kQSK4HeCgkOv0U0pkQ8/s1200/64.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1065" data-original-width="1200" height="568" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgRcRgHO2D2RjB0IBumrq-tY67J5BXtvi_Ziol-RKZRmjmW9-UdxlJRXsQD1ie-QD2o2Xesz8lKF6cKDsTHItqgOlbMTOWvLjpBtfxI_jiL15g0RvrLwSnRg9qW-N8fe_vR1GZXL1MMztK8cSBXrD4EjTy-3OocIdnE_R05eNL5kQSK4HeCgkOv0U0pkQ8/w640-h568/64.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">The final step was to replace the scratched up hood with a new reproduction hood and aluminum trim. The first step was to remove the hinge assembly from the original hood. For this one needs to access the screws that bolt the hood to the hinges. Usually a fresh razor blade does the trick:</div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4A7u1zFpkI9WgM3ZIivp5XGciqwU_nqTXpnNDAVRBzWo4Y5wqcLwvV0cs18BWkZR0RVHeV-1vRQSl7Ok5G0nSh884eGagVQKvreCf-16NI_l_Zn-sSWKyLqsAr91nAp1CmTzPKdUCU2fSgUqLZnPIumqb-cFUedlXFkoBu4fcMMtRA2HSaC3klOB5ChQ/s1200/65.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi4A7u1zFpkI9WgM3ZIivp5XGciqwU_nqTXpnNDAVRBzWo4Y5wqcLwvV0cs18BWkZR0RVHeV-1vRQSl7Ok5G0nSh884eGagVQKvreCf-16NI_l_Zn-sSWKyLqsAr91nAp1CmTzPKdUCU2fSgUqLZnPIumqb-cFUedlXFkoBu4fcMMtRA2HSaC3klOB5ChQ/w640-h480/65.jpg" width="640" /></a></div>As so often this hood already showed cracks developing around the bolt holes. They are a mayor stress point due to the flat head screws that were used in this design:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEioav8lhSpTsIbNz-JN3nMFGChSI9Lwx9bLTe7SKC6GeX0z1ZDOd8oh4C02xDxMRTWI85Zd3TrT8e0CCZdS74vnHvgfUmHjVvpU-7EEp1GONR1D-fU1zBnViHlwycvLZEDcCnz32imENEYUqKtii0U4uV00EWUbmdycsT7jjjBj-9eNrV6sq1Tyo1eY3NY/s1200/65a.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEioav8lhSpTsIbNz-JN3nMFGChSI9Lwx9bLTe7SKC6GeX0z1ZDOd8oh4C02xDxMRTWI85Zd3TrT8e0CCZdS74vnHvgfUmHjVvpU-7EEp1GONR1D-fU1zBnViHlwycvLZEDcCnz32imENEYUqKtii0U4uV00EWUbmdycsT7jjjBj-9eNrV6sq1Tyo1eY3NY/w640-h480/65a.jpg" width="640" /></a></div><span style="text-align: justify;">This shows the new hood with the new trim as I aligned it with my centering tools:</span><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLcEUzb5QYMSLd7krsLr5KYluioschtbmTD2_N7lS6Y7mn3CHH-1BtcYADsvjG09Me3ctCobyKT-Wq6Nhw8SGl4IDrhyphenhyphenp2ZLx_TwyveszvEJJr7zriYAi36EZYzlDBixKQBsP8Z8kMATkevSs5iaMcd175CH10Sz1w3KS17fabs3lZ4V4Bqo2e3y8yN54/s1200/66.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="635" data-original-width="1200" height="338" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLcEUzb5QYMSLd7krsLr5KYluioschtbmTD2_N7lS6Y7mn3CHH-1BtcYADsvjG09Me3ctCobyKT-Wq6Nhw8SGl4IDrhyphenhyphenp2ZLx_TwyveszvEJJr7zriYAi36EZYzlDBixKQBsP8Z8kMATkevSs5iaMcd175CH10Sz1w3KS17fabs3lZ4V4Bqo2e3y8yN54/w640-h338/66.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvL-UzTqMZk9TCb-QTgvPNXi9zWj-l_r-0C1baz7mQ7XB84xCxHYpV6LK1pXC6_swFpFzgNc0GO7IxaME6nV-cot750pkNzGrX77gzB8RRNpqY5211aIYitjD8WzX1Ttftp74EkJDGARlS4IcfXJzBtkZlbw1wEJSx0IDf4-Fwp96F-63psfW2eGOyYCc/s1200/67.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvL-UzTqMZk9TCb-QTgvPNXi9zWj-l_r-0C1baz7mQ7XB84xCxHYpV6LK1pXC6_swFpFzgNc0GO7IxaME6nV-cot750pkNzGrX77gzB8RRNpqY5211aIYitjD8WzX1Ttftp74EkJDGARlS4IcfXJzBtkZlbw1wEJSx0IDf4-Fwp96F-63psfW2eGOyYCc/w640-h480/67.jpg" width="640" /></a></div>The tools make it easy to place a pencil alignment mark from the strip to the blue tape affixed to the hood.</div><div>The next steps are bolting the hinge into the new hood and then glueing the strip on. This shows the end result:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEl7QekEpvS-V9Yqd5HJHQhm5ryzhEChw0tmLsa4bin5dT0il8nnyVwJFGYnxpgY8I-XadkeHZErICa_YXL84VE8XLJG1JrzQwxcwNq590iUI167Cfmep_g2YUjPT8IS8zKqK2LgF50WWImIttpVa4Y0Hd7hK6uvfvbiGrppWuMHbcHKxICERduNwPxCk/s1200/68.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="694" data-original-width="1200" height="370" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEl7QekEpvS-V9Yqd5HJHQhm5ryzhEChw0tmLsa4bin5dT0il8nnyVwJFGYnxpgY8I-XadkeHZErICa_YXL84VE8XLJG1JrzQwxcwNq590iUI167Cfmep_g2YUjPT8IS8zKqK2LgF50WWImIttpVa4Y0Hd7hK6uvfvbiGrppWuMHbcHKxICERduNwPxCk/w640-h370/68.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">Beautiful! I will now play this deck a while longer and if nothing additional comes up it will soon be time to return it to its owner!</div><div style="text-align: justify;"><br /></div><p><br /></p></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-44519750425817467832023-11-01T00:02:00.000-04:002023-11-01T00:02:25.279-04:00Beogram 4004 (5526): A New Arrival from Maryland - A First Look<p style="text-align: justify;">I recently received a Beogram 4004 (Type 5526) for a complete functional restoration from a customer in Maryland. This post makes a first assessment of the condition of the unit. The restoration process will be discussed in a follow-up post.</p><p style="text-align: justify;">The unit arrived well packaged in a Beolover-supplied box and all went well. I extracted it and put it on the bench:</p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7IQS9VjazEpA5Md0taC01b4aDH5DmTEgxgt1I1AxigyDzXOdXmxewqCNaRr02PatAbCK3-HurPUKtX2Skpahfp3G6uDvJi5fB8c6pEhjbt5AJCKVuYOcGrO35A4UhmWP6Ijm5NS5_Mo_pdBDTEr-2fdnrO8oYRkRxeAWfNGzC1_VKcZg_e2MTlQmTESo/s1200/1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7IQS9VjazEpA5Md0taC01b4aDH5DmTEgxgt1I1AxigyDzXOdXmxewqCNaRr02PatAbCK3-HurPUKtX2Skpahfp3G6uDvJi5fB8c6pEhjbt5AJCKVuYOcGrO35A4UhmWP6Ijm5NS5_Mo_pdBDTEr-2fdnrO8oYRkRxeAWfNGzC1_VKcZg_e2MTlQmTESo/w640-h480/1.jpg" width="640" /></a></div><div style="text-align: justify;">It is in pretty decent cosmetic condition. As so often the hood is fairly scratched up, but my customer sent a new reproduction hood along, which will be installed. I removed the hood:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEimIRYa1Padtp7C7M6a4ENyrlDy0uEmyaEb9J1znzgiHCm_LeZsZNEKJ4lpsc5NNyNkH_yk44MnU4ruQrsP3kgRuI5RuDuyycVyIVOhgnY3W1bYlrtDCG1UTWq7eHwZr6ygLZsHBYYhgsv7g0KRzkCeKDypR6HnUJgFu1oXedl-Hk-JdMo293sEf629_so/s1200/2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEimIRYa1Padtp7C7M6a4ENyrlDy0uEmyaEb9J1znzgiHCm_LeZsZNEKJ4lpsc5NNyNkH_yk44MnU4ruQrsP3kgRuI5RuDuyycVyIVOhgnY3W1bYlrtDCG1UTWq7eHwZr6ygLZsHBYYhgsv7g0KRzkCeKDypR6HnUJgFu1oXedl-Hk-JdMo293sEf629_so/w640-h480/2.jpg" width="640" /></a></div><div style="text-align: justify;">The keypad is still in a pretty nice condition:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZUDI4Gbw0V5bFy4Rx_ZIBzTwauiEqaZ3cVkcCMD0AR-TtkQLlvJ7CbAfYOI12C4Ho2GYN7XDh-zk4WZvoBmp-Wxgfdg4FlWnz3-FEQ3idVFRCk6De82Q1_qiiDizJjueFJ8QiWDjUSiaOy_KWGyChAM2dhZp_XdmnyKeYNbiFQWpBr06PDKB9WvHvK8Q/s1200/3.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZUDI4Gbw0V5bFy4Rx_ZIBzTwauiEqaZ3cVkcCMD0AR-TtkQLlvJ7CbAfYOI12C4Ho2GYN7XDh-zk4WZvoBmp-Wxgfdg4FlWnz3-FEQ3idVFRCk6De82Q1_qiiDizJjueFJ8QiWDjUSiaOy_KWGyChAM2dhZp_XdmnyKeYNbiFQWpBr06PDKB9WvHvK8Q/w640-h480/3.jpg" width="640" /></a></div><div style="text-align: justify;">The plinth as well. It still has undamaged corners:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgipXXJt5qG9OlKQf7UOkuaREatgwWnjWCks6mzvyLhDujk5TliGaYjWW4CUFg0ky7sRRZ2B-fdVfQ53vVp_ovaJkDp-iqYkgc1zKqAtJKJcB6MNvoDh6a0v6t1nDqVnUHFsFFcrIBPs2WiUSLDolVSnCUyFjrQgcS7BbVG2-SOHEqFHoGwb8Mj6aZoHcQ/s1200/4.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgipXXJt5qG9OlKQf7UOkuaREatgwWnjWCks6mzvyLhDujk5TliGaYjWW4CUFg0ky7sRRZ2B-fdVfQ53vVp_ovaJkDp-iqYkgc1zKqAtJKJcB6MNvoDh6a0v6t1nDqVnUHFsFFcrIBPs2WiUSLDolVSnCUyFjrQgcS7BbVG2-SOHEqFHoGwb8Mj6aZoHcQ/w640-h480/4.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhlYUsV9babzfsLwnywI93ldRITSbyh-hw-3nQ2szXml9jb5BfzquTLA9_qeV7pCwQrndaGmmUiUz6cyJw7qfwHtXwX3wycEfQhnwmwQlrC-VmVtuarTW2_fZMcssDJwEzjvCjTYpvCMM0YZ2dTnGGF5q52ptrYRjCfcjLJS2iOYKSHHpmO5lyQsVSZeP4/s1200/5.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhlYUsV9babzfsLwnywI93ldRITSbyh-hw-3nQ2szXml9jb5BfzquTLA9_qeV7pCwQrndaGmmUiUz6cyJw7qfwHtXwX3wycEfQhnwmwQlrC-VmVtuarTW2_fZMcssDJwEzjvCjTYpvCMM0YZ2dTnGGF5q52ptrYRjCfcjLJS2iOYKSHHpmO5lyQsVSZeP4/w640-h480/5.jpg" width="640" /></a></div><div style="text-align: justify;">Unfortunately there is some minor scratching on the platter:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQ-72zpj35RHXBRiJB1UKlJ9bz4MmPDwSsDDfM4QaiXoZzCrOG1EnF3wBHK8cSREyiddL9Za4HP1ug1bd60aD73JiGqBEHslLgqZvMAFKOczsm6IAMsHNONM4ZCe22WQfNZtjO4OQu3w9N8gtGe-lROgMefe-aPbX0M4Q-vsOgoWbJyLjiElVGKZvbdWE/s1200/6.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQ-72zpj35RHXBRiJB1UKlJ9bz4MmPDwSsDDfM4QaiXoZzCrOG1EnF3wBHK8cSREyiddL9Za4HP1ug1bd60aD73JiGqBEHslLgqZvMAFKOczsm6IAMsHNONM4ZCe22WQfNZtjO4OQu3w9N8gtGe-lROgMefe-aPbX0M4Q-vsOgoWbJyLjiElVGKZvbdWE/w640-h480/6.jpg" width="640" /></a></div><div style="text-align: justify;">I removed the aluminum panels and had a look 'below deck':</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKKBRVkzJp-iuCIELlsg1ApAimceEH0B1XHR4pD1YnrWT9JQWK91OtXDBt67nPeEm26Qj_YxLdWqzNVsjaaxlye4X8GEK3zP4JwVQltF9_WGC6mqOEd9ySLGWM_qoOOOa_BWvXxASiPsf8Q5Jfm1wW_1bpRuo3hx4dVdAmCqPy3Pp328N718olBy9oTC0/s1200/7.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKKBRVkzJp-iuCIELlsg1ApAimceEH0B1XHR4pD1YnrWT9JQWK91OtXDBt67nPeEm26Qj_YxLdWqzNVsjaaxlye4X8GEK3zP4JwVQltF9_WGC6mqOEd9ySLGWM_qoOOOa_BWvXxASiPsf8Q5Jfm1wW_1bpRuo3hx4dVdAmCqPy3Pp328N718olBy9oTC0/w640-h480/7.jpg" width="640" /></a></div><div style="text-align: justify;">The unit seems mostly unadulterated, which is usually a good start for a restoration. As usual, the transport lock bushings are degraded:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhn8F0rgpAvw1nWGlL-OsUNpZC8T3CnBYaVruTSRTgqz-coJy-YNdBe52WqmOKxi5Vi-xPtQ-0_BbhcaRqbUDz8fZXaZAExlGQFWLc2d5oFZI12JG4FHSWa7j0Ga_b_Wh3KYC3EwQZ62q3RvUOxcUPyclNtMibGcDthiF6bYmeRYq2b_qJmyrrSY5CjZZM/s1200/8.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhn8F0rgpAvw1nWGlL-OsUNpZC8T3CnBYaVruTSRTgqz-coJy-YNdBe52WqmOKxi5Vi-xPtQ-0_BbhcaRqbUDz8fZXaZAExlGQFWLc2d5oFZI12JG4FHSWa7j0Ga_b_Wh3KYC3EwQZ62q3RvUOxcUPyclNtMibGcDthiF6bYmeRYq2b_qJmyrrSY5CjZZM/w640-h480/8.jpg" width="640" /></a></div><div style="text-align: justify;">Luckily, there are custom made Beolover bushing replacements, which will be installed during the restoration of this Beogram. </div><div style="text-align: justify;">After this visual inspection I plugged the deck in and pressed start: The carriage started moving, found the LP setdown point and then activated the solenoid. So far so good! After the solenoid activated the carriage started moving towards the center of the platter. This behavior is consistent with a too aggressive carriage feedback setting.</div><div><div style="text-align: justify;">Once the carriage hit the end of travel switch nothing happened anymore. This told me that most likely one of the H-bridge transistors was bad. Normal behavior would have been for the carriage to return back to its home position.</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRlgef-d6q5tw3tuKCT1eJujKCdH-v6wySG65I3BnmEOuasmcA-PEzhL8SjP84lUL91ritnDX7QJMM_biJgOOxo4dA5MCfx1gj7bv2kwV9zbb7MZu8fz05wJHAqoXi92Rqud42jsIi0N90-GwjbDpGw7k6wHk9RtAvZXdGt0xsBuecghcmygOyP5451Ec/s1200/9.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRlgef-d6q5tw3tuKCT1eJujKCdH-v6wySG65I3BnmEOuasmcA-PEzhL8SjP84lUL91ritnDX7QJMM_biJgOOxo4dA5MCfx1gj7bv2kwV9zbb7MZu8fz05wJHAqoXi92Rqud42jsIi0N90-GwjbDpGw7k6wHk9RtAvZXdGt0xsBuecghcmygOyP5451Ec/w640-h480/9.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">In summary, this promises to be a fairly straight forward restoration. Let's see if this assessment is correct!..;-). Stay tuned!</div><div style="text-align: justify;"><br /></div><p><br /></p></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-16413456600796137362023-10-22T01:14:00.002-04:002024-03-03T19:41:10.802-05:00Beomaster 5500 Type 2333: Reassembly and Initial TestingThe <a href="https://beolover.blogspot.com/2023/10/beomaster-5500-type-2333-pcb.html" target="_blank">previous project post</a> showed the dis-assembly of the Beomaster 5500 for doing work on the circuit boards.<div><br /></div><div>That post left off with the output amplifier heatsinks needing to be re-installed on the Power Supply & Output Amplifier board.<br /><br />I used Sil-Pad thermal insulators in place of thermal paste as it is easier to work with (less messy) and does a great job. There are two lone transistors (IC205 and IC405) that fit between the heatsink channels that do require some thermal paste compound as they don't have spring clips to press them against the heatsink (like the other, larger transistors do).</div><div><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjiAvnu4V-p88wA-qScrN13xlBYPQSEd1ruUn6S175Jy9pT8r1G-kUJCLkzAYyyR_Gmsj856IAuWgG3zP1WoCtCHJHMPkqW9tE1hdHNdktBWmvbmTdrb7kjdmBjsiuJPsewbNRa98hTRez3NUBWWTnN-JxFuRQ8j7KNz5HvNDHJyhwH4cbCenD7U6Q2UkKz/s2200/bm5500_2333_kt_ps_and_output_pcb_recap_08.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1597" data-original-width="2200" height="464" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjiAvnu4V-p88wA-qScrN13xlBYPQSEd1ruUn6S175Jy9pT8r1G-kUJCLkzAYyyR_Gmsj856IAuWgG3zP1WoCtCHJHMPkqW9tE1hdHNdktBWmvbmTdrb7kjdmBjsiuJPsewbNRa98hTRez3NUBWWTnN-JxFuRQ8j7KNz5HvNDHJyhwH4cbCenD7U6Q2UkKz/w640-h464/bm5500_2333_kt_ps_and_output_pcb_recap_08.jpg" width="640" /></a></div><br /><div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7S5qjp6FTP0Rnv4Z8lua_kiHHXJ-i_5dVqwLOgVDOte78RteJuJnamtc7Zi-7l9Nv1QoSuwuWnaHJn0QMdy1LwCUlhC9gAAmSGxDsL-wpHVohldoK01DYEvQFPs3k2-7GOATiWOdvvVw6ZxHK8qG0NvNGZBtOOKhGGTBM2GxPauXuHt1V1zTmr7Prmfl7/s2200/bm5500_2333_kt_ps_and_output_pcb_recap_09.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1496" data-original-width="2200" height="436" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7S5qjp6FTP0Rnv4Z8lua_kiHHXJ-i_5dVqwLOgVDOte78RteJuJnamtc7Zi-7l9Nv1QoSuwuWnaHJn0QMdy1LwCUlhC9gAAmSGxDsL-wpHVohldoK01DYEvQFPs3k2-7GOATiWOdvvVw6ZxHK8qG0NvNGZBtOOKhGGTBM2GxPauXuHt1V1zTmr7Prmfl7/w640-h436/bm5500_2333_kt_ps_and_output_pcb_recap_09.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />The next set of pictures show the re-assembly of the restored boards back into the Beomaster 5500 cabinet.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgytGRyfYmGG2MCLbUkbKtiFSnMOkNu_mWMA06Qli46Pavc64i7_RYp7qPf6ehXrfvVK94P0aBggcqdJfRNbR82Jb_8BS_ZFALRbgB3WPZ58H8wOR3LF7TTn_JkItiSH_TRHmCas7mxwESOflqqdk6SLpEcNTKH8xokaIvnXkW8xHsba7usLHjIMVSB7QCQ/s2200/bm5500_2333_ckt_board_install_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1584" data-original-width="2200" height="460" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgytGRyfYmGG2MCLbUkbKtiFSnMOkNu_mWMA06Qli46Pavc64i7_RYp7qPf6ehXrfvVK94P0aBggcqdJfRNbR82Jb_8BS_ZFALRbgB3WPZ58H8wOR3LF7TTn_JkItiSH_TRHmCas7mxwESOflqqdk6SLpEcNTKH8xokaIvnXkW8xHsba7usLHjIMVSB7QCQ/w640-h460/bm5500_2333_ckt_board_install_01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEieq2CJJk2hyZ2gN1KuTELc_Hf-0bVvAcI7MyseIypmJoaswFAZ6LFnkchhF7e5W_fp-Vn0JG6mNYAXIkzDorJZOETucueDs6nV7Bl1xy-ugZxFhnCdx4z06MlT-afS64ZYlhdR3FokazkO-1EW4MIU09lze40hd_sBa9RIShLcmt3VJTIRvZZNmbU_r6Ls/s2200/bm5500_2333_ckt_board_install_02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1533" data-original-width="2200" height="446" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEieq2CJJk2hyZ2gN1KuTELc_Hf-0bVvAcI7MyseIypmJoaswFAZ6LFnkchhF7e5W_fp-Vn0JG6mNYAXIkzDorJZOETucueDs6nV7Bl1xy-ugZxFhnCdx4z06MlT-afS64ZYlhdR3FokazkO-1EW4MIU09lze40hd_sBa9RIShLcmt3VJTIRvZZNmbU_r6Ls/w640-h446/bm5500_2333_ckt_board_install_02.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLNVYhzpr4PRJoWqrXKgVhnIabt0l4UK56Jyd0vs9KT-oWfpXuML0E1NjqBocMYUgxbUEwBsdr0WQohhcrZrkh2zCc59WqHzMpjTpcEsMTq2r2o3avQVCJFgJ3RC1kl83-SkvKUHnMO8-2iKh9y0IWtNtrdlxPg2Aqr0TDo2NVKrJc2JbgM2NpeLuQjz07/s2200/bm5500_2333_ckt_board_install_03.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhLNVYhzpr4PRJoWqrXKgVhnIabt0l4UK56Jyd0vs9KT-oWfpXuML0E1NjqBocMYUgxbUEwBsdr0WQohhcrZrkh2zCc59WqHzMpjTpcEsMTq2r2o3avQVCJFgJ3RC1kl83-SkvKUHnMO8-2iKh9y0IWtNtrdlxPg2Aqr0TDo2NVKrJc2JbgM2NpeLuQjz07/w640-h480/bm5500_2333_ckt_board_install_03.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitPExlGEzBaPvX0v_tQaRkSjZigDQJ_2jXhlahIgIptnMZT6aw0lEXyfL87p9ZThinxDuCLqi5kXuMwFk1UtoBdsDNEeBOJc47jCVq5LjibqYXe8wBmIeXTe1VjcOqCXqONGXWVy9jVY5Nrm8gxXYW8-YsYxwAkM4v9WvrxhIR7AbiObkPcFGVAFRihriG/s2200/bm5500_2333_ckt_board_install_04.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEitPExlGEzBaPvX0v_tQaRkSjZigDQJ_2jXhlahIgIptnMZT6aw0lEXyfL87p9ZThinxDuCLqi5kXuMwFk1UtoBdsDNEeBOJc47jCVq5LjibqYXe8wBmIeXTe1VjcOqCXqONGXWVy9jVY5Nrm8gxXYW8-YsYxwAkM4v9WvrxhIR7AbiObkPcFGVAFRihriG/w640-h480/bm5500_2333_ckt_board_install_04.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhwTARDQPPhDhzhyphenhyphenB3cAkUDEdGlkNzOpAORpIR5UQBsaN782XsIjq2HRhYJANULe68R0zNEmOw4HX5Io8jeXDLLiMShE-qsIHCm7FdNEG1Qod_8H5yzrurdfU1zgzHVPOe1X7TA1CbXXBPUydWu2DCM547OgcP8MlYwbnuS5jrxdY9XCAmYjqjIq_pzXMjH/s2200/bm5500_2333_ckt_board_install_05.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhwTARDQPPhDhzhyphenhyphenB3cAkUDEdGlkNzOpAORpIR5UQBsaN782XsIjq2HRhYJANULe68R0zNEmOw4HX5Io8jeXDLLiMShE-qsIHCm7FdNEG1Qod_8H5yzrurdfU1zgzHVPOe1X7TA1CbXXBPUydWu2DCM547OgcP8MlYwbnuS5jrxdY9XCAmYjqjIq_pzXMjH/w640-h480/bm5500_2333_ckt_board_install_05.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />With the circuit boards re-installed I was able to plug the Beomaster 5500 into AC power and do some initial tests on the Beomaster.<div><br /></div><div>I did some quick measurements of key DC voltages with the Beomaster turned on.<br />The positive and negative 40 volt rail voltages were there as well as 5 volts, 8 volts, 12 volts, 13 volts and 28 volts.<br /><br />I adjusted the Left and Right channel no-load current biasing for the Output Amplifiers and then tried playing some music with the Beomaster.<br /><br />Here are photos of my measurement probes for the the no-load current adjustments.<br />That adjustment requires the Beomaster 5500 to be on (out of Standby), have the volume level of the amplifier set to zero and no speakers connected to the amplifier.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgY1XsAp1XtjpcJzma1g-67HySIdJEkKCXdalCem5EStwPy5BIuiOJ50MqE-yQw5IVUYvlomY5h346zfGU2CjE-jRYfzKxCFyxEd-3pJKSKW3Jr99YmUucmHvD6-9Bqoqwvi0iCw_iIy-2WsJUYyJg4D4LVaDQ_cOI0czsFZxrvBaW4dIWWuFyhQfVqJfmE/s2200/bm5500_2333_no-load_current_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="905" data-original-width="2200" height="264" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgY1XsAp1XtjpcJzma1g-67HySIdJEkKCXdalCem5EStwPy5BIuiOJ50MqE-yQw5IVUYvlomY5h346zfGU2CjE-jRYfzKxCFyxEd-3pJKSKW3Jr99YmUucmHvD6-9Bqoqwvi0iCw_iIy-2WsJUYyJg4D4LVaDQ_cOI0czsFZxrvBaW4dIWWuFyhQfVqJfmE/w640-h264/bm5500_2333_no-load_current_01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />The trimmers were adjusted so the voltage reading across the emitter resistors of the channel measured 11 millivolts DC.<br /><br />The Beomaster 5500 was now ready for a quick listening test.<br />When the voltages check out and the no-load (idle) current has been adjusted, I like to do a listening check of the amplifier. It is like an early reward for the restoration work to get to this point.<br /><br />I connected up two sets of Beovox speakers in the workshop. A pair of MC120.2 speakers and a pair of S-55 speakers. For a music audio source I connected an iPod to the Beomaster 5500 CD source input.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjRfpNbaFx1UnnN_urXom74kco_vq-gqMrt5an-TH-3k5IjhJLrQ0zJRNy1rb2xWOpCbR9wMTymIUwBcSwtPRuDLHOSfd7UBxd93YcKbNbsvCzBDC60dLv0J2YndUWmDjlNm-u5TDfr7LG7q37uGWV3_eeLfS-muATAU9gZ-5RD61Y9xMbsSH03Fwz_Tr1Y/s2200/bm5500_2333_speaker_and_source_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjRfpNbaFx1UnnN_urXom74kco_vq-gqMrt5an-TH-3k5IjhJLrQ0zJRNy1rb2xWOpCbR9wMTymIUwBcSwtPRuDLHOSfd7UBxd93YcKbNbsvCzBDC60dLv0J2YndUWmDjlNm-u5TDfr7LG7q37uGWV3_eeLfS-muATAU9gZ-5RD61Y9xMbsSH03Fwz_Tr1Y/w640-h480/bm5500_2333_speaker_and_source_01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhff0L9pycBcy485F2f0mhDacnOlW3-Qnuk2jMwXW00FwIP-R-T_hzddeJDzUg5YxZHcX9AX8x5JdhbG0Fwtg-T8CjJE_7Y9pla2jRiEt4vJeQZjrKuE8BKp2zpNO4hRLGdgq3ZSmE__Z2VIROrm7weWtCWjC2E0Z23olHLzHlwwTo5sZERGDzwC9bKdQWj/s2200/bm5500_2333_first_listen_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhff0L9pycBcy485F2f0mhDacnOlW3-Qnuk2jMwXW00FwIP-R-T_hzddeJDzUg5YxZHcX9AX8x5JdhbG0Fwtg-T8CjJE_7Y9pla2jRiEt4vJeQZjrKuE8BKp2zpNO4hRLGdgq3ZSmE__Z2VIROrm7weWtCWjC2E0Z23olHLzHlwwTo5sZERGDzwC9bKdQWj/w640-h480/bm5500_2333_first_listen_01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />The Beomaster 5500 sounds great (as expected).<br />Now I can complete the rest of the Beomaster 5500 reassembly and move on to some audio tests.<br />I will also be doing some functional testing of this Beomaster 5500 with other Beosystem 5500 components and the MCP remote control.sonavoraudiohttp://www.blogger.com/profile/04144547857529140916noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-13140455519825892642023-10-11T16:24:00.002-04:002024-03-03T19:41:26.963-05:00Beomaster 5500 Type 2333: PCB Restoration TasksIn the <a href="https://beolover.blogspot.com/2023/09/beomaster-5500-type-2333-new-beomaster.html" target="_blank">previous post</a> I assessed the restoration tasks of this Beomaster 5500.<br /><br />This post shows the work performed on the Beomaster 5500 circuit boards.<div><br /></div><div>The first step was to remove the boards that will need to be worked on.<br />Here is a photo of the Beomaster 5500 prior to removing the boards. The boards that will be worked on are labeled in the photo.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhcut2WMdxIJTDFBUMkw_WlMGEFR-CgR30LIFfzdDc4JRHWKKDVhvN1lsi3MHrXh4QXP0CbddYvkZjFrloQdnNH4lFAWKZ9QGkC7XGJm0NuUoHicb-KSl6aWTQgO56N4CKeryA1NjeXlCFZT5RSeMp-VWYDvDzaOFjvhkBzpZgps6qPzgoZiord-4NRh96j/s2200/bm5500_2333_kt_board_removal_00.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhcut2WMdxIJTDFBUMkw_WlMGEFR-CgR30LIFfzdDc4JRHWKKDVhvN1lsi3MHrXh4QXP0CbddYvkZjFrloQdnNH4lFAWKZ9QGkC7XGJm0NuUoHicb-KSl6aWTQgO56N4CKeryA1NjeXlCFZT5RSeMp-VWYDvDzaOFjvhkBzpZgps6qPzgoZiord-4NRh96j/w640-h480/bm5500_2333_kt_board_removal_00.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div>The following pictures are a sequence of Beomaster 5500 photos showing the boards being removed.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhqiluEhQUY1YzSB3MtCSDXgy2JelPkfTRMd7gwuRItHKjT_zZ1Zc5dYQv39TjbBSfDU5kQ7YwWpYo31lTf_dSzeF4Xst6q5KN0BZ5vQWdfHOFoo12sTJvmH3mE2Ec4iK7pib2DyqoLNhOeig3MrVCDDFitTI1pbYOP665B7vtydfx8p5lyPHYY-6TVBZ4b/s2200/bm5500_2333_kt_board_removal_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1448" data-original-width="2200" height="422" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhqiluEhQUY1YzSB3MtCSDXgy2JelPkfTRMd7gwuRItHKjT_zZ1Zc5dYQv39TjbBSfDU5kQ7YwWpYo31lTf_dSzeF4Xst6q5KN0BZ5vQWdfHOFoo12sTJvmH3mE2Ec4iK7pib2DyqoLNhOeig3MrVCDDFitTI1pbYOP665B7vtydfx8p5lyPHYY-6TVBZ4b/w640-h422/bm5500_2333_kt_board_removal_01.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi565efvNE0XcmAkK-kDTPBo3wWvZDivgLOkPwSgA68yjWtdxYMu4ejxz6yYuWqovGlNJF7CaZSY2Z_CBloDRetgpHUkXW9BkLUYQgQDPiaxqhKN0f7JWgGpgQE5yEPVPcfhP4SWiXRO5n9i2oLunrt9gfNih6gxcotZRT4AJB26xTIE-pvbQFHoMXII0BR/s2200/bm5500_2333_kt_board_removal_02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1562" data-original-width="2200" height="454" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi565efvNE0XcmAkK-kDTPBo3wWvZDivgLOkPwSgA68yjWtdxYMu4ejxz6yYuWqovGlNJF7CaZSY2Z_CBloDRetgpHUkXW9BkLUYQgQDPiaxqhKN0f7JWgGpgQE5yEPVPcfhP4SWiXRO5n9i2oLunrt9gfNih6gxcotZRT4AJB26xTIE-pvbQFHoMXII0BR/w640-h454/bm5500_2333_kt_board_removal_02.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br /><br /><br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjvxhwxoM9JZ4bpoOEhITHb9IE_CavV_hc92qEadvJGq3AwAXc5kuwhOFfAabdBnIx2xNBGuF94E42SNDRxG7tUvgkeQWwlKVazCuMLdORqeXeNlGXV1uFk-a17ll0PN3KuBNb-QBJlWnxDChcjkdAvNghbT_jwAKbrCxB7Kow9u8la18ekOYNPa9UYbivD/s2200/bm5500_2333_kt_board_removal_03.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjvxhwxoM9JZ4bpoOEhITHb9IE_CavV_hc92qEadvJGq3AwAXc5kuwhOFfAabdBnIx2xNBGuF94E42SNDRxG7tUvgkeQWwlKVazCuMLdORqeXeNlGXV1uFk-a17ll0PN3KuBNb-QBJlWnxDChcjkdAvNghbT_jwAKbrCxB7Kow9u8la18ekOYNPa9UYbivD/w640-h480/bm5500_2333_kt_board_removal_03.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhYgnVuRkFdWXXgaZhxzMGFKxQn_n0YJ0_bDwqMtkCRkjAf0T4S9Y5Bd5o8JVClB7MXNIhAxPM16ABNtZIw9uVHymJ5TUTzdBTAvj8rmnQ0Fe55FeSWn1PSMnwddq5Luey9nDHqVeLOAVK0DqAJolel_p3Qwxh3V0I-ykLTxq6aoDPz2T6qAYjGKaMUWwSu/s2200/bm5500_2333_kt_board_removal_04.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1520" data-original-width="2200" height="442" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhYgnVuRkFdWXXgaZhxzMGFKxQn_n0YJ0_bDwqMtkCRkjAf0T4S9Y5Bd5o8JVClB7MXNIhAxPM16ABNtZIw9uVHymJ5TUTzdBTAvj8rmnQ0Fe55FeSWn1PSMnwddq5Luey9nDHqVeLOAVK0DqAJolel_p3Qwxh3V0I-ykLTxq6aoDPz2T6qAYjGKaMUWwSu/w640-h442/bm5500_2333_kt_board_removal_04.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />The last photo above shows the Microcomputer board removed...so I will start with that one.<br />Here are the before and after pictures of the Microcomputer board restoration.<br />There are just two electrolytic capacitors in this board.<br />There is also a CR2430, 3V Lithium battery. It still measured 3V but it is still good to go ahead and replace the battery with a brand new one.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4nm_DrzFDL-Bgcsq9QbscAyPdxV_8fAVSDbYa8LGQ1TPdfKgebBmJ5EMMVdBuZK3pO3NcEgG3oBrF2Ys4YtOzjw_jrK-xmEGcgoed29hKIWkz6YOj_4kJGEPW3KQGVGV6zFIXe0H-g6jejvpft_aymwd7xTlpHSvhDbgqF8vfhdgIQgw2wW9XBgHxVVdr/s2483/bm5500_2333_kt_uC_pcb_recap_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="2483" data-original-width="2200" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg4nm_DrzFDL-Bgcsq9QbscAyPdxV_8fAVSDbYa8LGQ1TPdfKgebBmJ5EMMVdBuZK3pO3NcEgG3oBrF2Ys4YtOzjw_jrK-xmEGcgoed29hKIWkz6YOj_4kJGEPW3KQGVGV6zFIXe0H-g6jejvpft_aymwd7xTlpHSvhDbgqF8vfhdgIQgw2wW9XBgHxVVdr/w568-h640/bm5500_2333_kt_uC_pcb_recap_01.jpg" width="568" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div>Note that for installing the new CR2430 battery I installed a battery holder for it.</div><div><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhTNOyflXRL_VNlyNfCcLMYoVecz5alkSlWz9ykS8UPm2KLiFRUn-F0dMILKx2wMQxKoil8suAt_daEauPDwYHtqDpN5SIfaJG7Iclel1aknSgBpTBWYMmYd6mqLfuOnvlJfkVIqrIusbKgOR-CrKG1qhi5rjelLfmf4DU7ZrP8kun2ihCQwsKugz53JDpl/s2200/bm5500_2333_kt_uC_pcb_recap_02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhTNOyflXRL_VNlyNfCcLMYoVecz5alkSlWz9ykS8UPm2KLiFRUn-F0dMILKx2wMQxKoil8suAt_daEauPDwYHtqDpN5SIfaJG7Iclel1aknSgBpTBWYMmYd6mqLfuOnvlJfkVIqrIusbKgOR-CrKG1qhi5rjelLfmf4DU7ZrP8kun2ihCQwsKugz53JDpl/w640-h480/bm5500_2333_kt_uC_pcb_recap_02.jpg" width="640" /></a></div><br /><div><br /><br /><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br />The next board assembly is the Cooling Fan assembly. It also has two electrolytic capacitors that I replaced.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBB7ttR67iiBkfcq_Z51Um8Inl6InSNyos3uXBVDyZNTX96MEQsVV2KJIl5i9xfuyDcqlU5wjh0raYm-mfeHk0mYbnURcQwkTswDnPbPgG-WwsED67_RUjFqdoBpISL75qgAQxpipHmkRvO-xfBUaBvnQTuWSgsw_6eDPw8OcQbPQAHFX1v-pVgXZBeRH2/s3102/bm5500_2333_kt_cooling_fan_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="3102" data-original-width="2200" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBB7ttR67iiBkfcq_Z51Um8Inl6InSNyos3uXBVDyZNTX96MEQsVV2KJIl5i9xfuyDcqlU5wjh0raYm-mfeHk0mYbnURcQwkTswDnPbPgG-WwsED67_RUjFqdoBpISL75qgAQxpipHmkRvO-xfBUaBvnQTuWSgsw_6eDPw8OcQbPQAHFX1v-pVgXZBeRH2/w454-h640/bm5500_2333_kt_cooling_fan_01.jpg" width="454" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br />The FM board came next.<br /><br /></div><div>Here is the FM board as it was received.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguKBCo9-o1hQUyxVQkgzSxB23rVLy2X_0LuMXNdBTKHsXaKCBmZCtArNPM7O6ovbrU_F3YnzfwTjsyfM-dSkxwwDhylnzKDo_lorEaK3FQcsN1lM6AsxV6FkQpw5UDeHKh4p4KG5Ikp-QPz5yRL9WFIik4L7TxdyJbHeRjPn51enPuI60NRUp7InzWMKYU/s2200/bm5500_2333_kt_fm_pcb_recap_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1746" data-original-width="2200" height="508" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEguKBCo9-o1hQUyxVQkgzSxB23rVLy2X_0LuMXNdBTKHsXaKCBmZCtArNPM7O6ovbrU_F3YnzfwTjsyfM-dSkxwwDhylnzKDo_lorEaK3FQcsN1lM6AsxV6FkQpw5UDeHKh4p4KG5Ikp-QPz5yRL9WFIik4L7TxdyJbHeRjPn51enPuI60NRUp7InzWMKYU/w640-h508/bm5500_2333_kt_fm_pcb_recap_01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Here is the FM board after the electrolytic capacitors were replaced.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfTKz877FJ_V1mP-jrOgii2VV-03gdh5UZnVESoAquGamXRHz4sgw5apZEp6upaANj39j9BdVfPdDXsq_ABwRUXp-sCJyKxU_FXeIfJFaQ62FXTArT5CD2hCIdziqAUER-qJ-MTt9VNAeCgliGirQKuOx_C9gn_z2bYQrUsGM7xRKNq1wMyh_lISW7o0Bd/s2200/bm5500_2333_kt_fm_pcb_recap_02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1716" data-original-width="2200" height="500" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgfTKz877FJ_V1mP-jrOgii2VV-03gdh5UZnVESoAquGamXRHz4sgw5apZEp6upaANj39j9BdVfPdDXsq_ABwRUXp-sCJyKxU_FXeIfJFaQ62FXTArT5CD2hCIdziqAUER-qJ-MTt9VNAeCgliGirQKuOx_C9gn_z2bYQrUsGM7xRKNq1wMyh_lISW7o0Bd/w640-h500/bm5500_2333_kt_fm_pcb_recap_02.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br /><br /><br /><br /><br />Here is the recapped Preamplifier board. I didn't take a stand-alone before recapping photo of it so here are a couple of after recapping photos. I replaced all of the signal path electrolytic capacitors with non-polarized, Nichicon audio capacitors.</div><div><br /></div><div>Note that the highlighted Muting Relay had already been replaced so I didn't change that component.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiogVo9KaBYylpLYQGhymxw74FIx98C1EWROV7KBhD0COMWgwgNWs5o-9h0IUa2f-StobOWRkg4olCcqBfQd8gBe-WGoAs3nyUPNuOPYpMava4BVexYsTo_rDqLhWO4sUJplEuNbOMyFW3cnvMzH4h3idWP6WCplWlBWQs1uyIHvJTxvkNnlLxhO0vUhbdD/s2200/bm5500_2333_kt_preamplifier_pcb_recap_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1743" data-original-width="2200" height="508" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiogVo9KaBYylpLYQGhymxw74FIx98C1EWROV7KBhD0COMWgwgNWs5o-9h0IUa2f-StobOWRkg4olCcqBfQd8gBe-WGoAs3nyUPNuOPYpMava4BVexYsTo_rDqLhWO4sUJplEuNbOMyFW3cnvMzH4h3idWP6WCplWlBWQs1uyIHvJTxvkNnlLxhO0vUhbdD/w640-h508/bm5500_2333_kt_preamplifier_pcb_recap_01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIBSd8-nm0sXYsCb9TCDJCXvwSujPfYhC9iiyG9Mbsf5o4RyD9tv4-vtJMy3k3Q3HSVuaS9A8g5ywnszrL8DZ5BvOr6uKTEMMy7gTSiNsRQWXPIsHMESI_1BIvdmV89tyRg2QGvni7EB6irs9xCtgHrWXF4Y9-oQXGzacsHep2UnJDPw3-RJxhsBFwfRwX/s2200/bm5500_2333_kt_preamplifier_pcb_recap_02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1728" data-original-width="2200" height="502" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIBSd8-nm0sXYsCb9TCDJCXvwSujPfYhC9iiyG9Mbsf5o4RyD9tv4-vtJMy3k3Q3HSVuaS9A8g5ywnszrL8DZ5BvOr6uKTEMMy7gTSiNsRQWXPIsHMESI_1BIvdmV89tyRg2QGvni7EB6irs9xCtgHrWXF4Y9-oQXGzacsHep2UnJDPw3-RJxhsBFwfRwX/w640-h502/bm5500_2333_kt_preamplifier_pcb_recap_02.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />The last Beomaster 5500 circuit board I worked on is the Power Supply and Output Amplifier board.<br />Here it is removed from the cabinet prior to any restoration work.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgj7flnGBNZnvl0_BxoBHXBbjKUbLKl9i7NjoZLZ-aQqNxR1YJ8QTlmx882VT8GMaNqmajaPvC-o7s7tPx-DD_KziXDxDctkvICtgmOXZonXTDW_XtCYhpXIIN470YTfLHt5uQ7WHHukWTfES3joRjI43YL0prdglLR1G1-U0nJjJawpr2B7FwgGZslktTK/s2200/bm5500_2333_kt_ps_and_output_pcb_recap_01.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1732" data-original-width="2200" height="504" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgj7flnGBNZnvl0_BxoBHXBbjKUbLKl9i7NjoZLZ-aQqNxR1YJ8QTlmx882VT8GMaNqmajaPvC-o7s7tPx-DD_KziXDxDctkvICtgmOXZonXTDW_XtCYhpXIIN470YTfLHt5uQ7WHHukWTfES3joRjI43YL0prdglLR1G1-U0nJjJawpr2B7FwgGZslktTK/w640-h504/bm5500_2333_kt_ps_and_output_pcb_recap_01.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />The white thermal compound on the heatsink assembly is just getting to the point where it feels a little bit dry. For that reason I decided to remove the heatsink, clean the old thermal paste off and put new thermal protection on during re-assembly.<br /><br />Here are photos of the heatsink removal and thermal paste cleanup.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtWsqxVDBWSzMYsbiLII9n0FoU_MoKMz27k0ZGW9XfeH2JM2GQZM4ZD64ZEpYgyr4VmCyPL8EpDUiY9UXqFNJT-o3DB0z4Tg33bIDBnRVJpfB13vR2b3l8XVOjF2aORmb1_dXGYja5sSShlvgzGQN_aBxOAjey858RhgWEgr9aj8malFds4o7bdmOez-ZQ/s2200/bm5500_2333_kt_ps_and_output_pcb_recap_02.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtWsqxVDBWSzMYsbiLII9n0FoU_MoKMz27k0ZGW9XfeH2JM2GQZM4ZD64ZEpYgyr4VmCyPL8EpDUiY9UXqFNJT-o3DB0z4Tg33bIDBnRVJpfB13vR2b3l8XVOjF2aORmb1_dXGYja5sSShlvgzGQN_aBxOAjey858RhgWEgr9aj8malFds4o7bdmOez-ZQ/w640-h480/bm5500_2333_kt_ps_and_output_pcb_recap_02.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiG_Bf6GoNBGIc8ODHJITDkYgZ7IYatdLT-7qyeRwCbHaPdJQN43rk3xmG27eFcyutKPsoAHjIZIMEnldJH6wX5ZWre7Ii4Rx3LhwTDUXKhMd2VMvuVTYdagr5BxeEtrk30H7hMlfOIswCpZZhKRtdBZS_4pkUGRZVyTL0ount92_xcRms-c67aoCrut7kQ/s2200/bm5500_2333_kt_ps_and_output_pcb_recap_03.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1606" data-original-width="2200" height="468" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiG_Bf6GoNBGIc8ODHJITDkYgZ7IYatdLT-7qyeRwCbHaPdJQN43rk3xmG27eFcyutKPsoAHjIZIMEnldJH6wX5ZWre7Ii4Rx3LhwTDUXKhMd2VMvuVTYdagr5BxeEtrk30H7hMlfOIswCpZZhKRtdBZS_4pkUGRZVyTL0ount92_xcRms-c67aoCrut7kQ/w640-h468/bm5500_2333_kt_ps_and_output_pcb_recap_03.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br />Here is the Power Supply and Output Amplifier after I replaced the electrolytic capacitors, power supply relay and trimmer resistors for the output transistor bias.<br />There are two signal path blocking capacitors (2.2uF) for the audio signal from the Preamplifier board to this board. I replaced those two capacitors with the same type I used in the signal path on the Preamplifier board.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_bysWbJlFvy9egRm6Wdp01hXeEtNnh3KaW5qDN4HwRAL0ffiBv67-n2puFAwVMyBX1R_marRBpolR2I1kQES2iIBMi4KjKZ68sAM6n34vPjiPYfABYGjuA81XT2BQJt_y4vuHPY5Y1oxRGtjqy_Fyl2546sc-Cng9Y_cpJFatRDaac87SIjSsLlgETSED/s2200/bm5500_2333_kt_ps_and_output_pcb_recap_04.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1650" data-original-width="2200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_bysWbJlFvy9egRm6Wdp01hXeEtNnh3KaW5qDN4HwRAL0ffiBv67-n2puFAwVMyBX1R_marRBpolR2I1kQES2iIBMi4KjKZ68sAM6n34vPjiPYfABYGjuA81XT2BQJt_y4vuHPY5Y1oxRGtjqy_Fyl2546sc-Cng9Y_cpJFatRDaac87SIjSsLlgETSED/w640-h480/bm5500_2333_kt_ps_and_output_pcb_recap_04.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />Here is a closer photo of the new trimmer resistors.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZcolVcmfjAkubD_K9ym6CGltjmOn9bPAmgTqXI-Dt8IenjvOIl-ICUtLf-2qc-14riEC24ZLzSPDtTFwwlEVg14PABuXfW-SadPrSJ2zDytn6s6aGGSec7q5nqrxlLK3Qv7F2wcEWEphqDu_X81WL1Z0QDVX2VfON-FLw9DIQ69EI6CEpGpo64hpG-ooA/s2200/bm5500_2333_kt_ps_and_output_pcb_recap_07.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1728" data-original-width="2200" height="502" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZcolVcmfjAkubD_K9ym6CGltjmOn9bPAmgTqXI-Dt8IenjvOIl-ICUtLf-2qc-14riEC24ZLzSPDtTFwwlEVg14PABuXfW-SadPrSJ2zDytn6s6aGGSec7q5nqrxlLK3Qv7F2wcEWEphqDu_X81WL1Z0QDVX2VfON-FLw9DIQ69EI6CEpGpo64hpG-ooA/w640-h502/bm5500_2333_kt_ps_and_output_pcb_recap_07.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br /><br /><br />The original power supply relay looked like this, de-soldered from the board.<br /><br /></div><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9jLecgWaTKSKnMR9PQQnEG4qfRcd3t7M2aXy85-nyTUrlM7ncugZ0jiDuStup40_XUsSD2IXsbXpFE48TW72IH7w4-Rc2jfn0Pfa-l6lgnvIPkBYCusjxIxujwvqvTt-T_jraAUF2W4jVMHcFrexq9n_MsDDt2hKC5UO2xVO17HZV06owpy99EuzGIqRW/s2200/bm5500_2333_kt_ps_and_output_pcb_recap_05a.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1734" data-original-width="2200" height="504" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9jLecgWaTKSKnMR9PQQnEG4qfRcd3t7M2aXy85-nyTUrlM7ncugZ0jiDuStup40_XUsSD2IXsbXpFE48TW72IH7w4-Rc2jfn0Pfa-l6lgnvIPkBYCusjxIxujwvqvTt-T_jraAUF2W4jVMHcFrexq9n_MsDDt2hKC5UO2xVO17HZV06owpy99EuzGIqRW/w640-h504/bm5500_2333_kt_ps_and_output_pcb_recap_05a.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br />The relay (RL1) still works but judging by the heat marks on the board and the fact that the Muting Relay (same type of relay) was already replaced...it is a good idea to go ahead and replace this relay.<br /><br />I used a modern, enclosed relay. It has two extra relay contacts that I had to cut off so that I end up with an identical mounting foot print. I have used this replacement relay before on my own Beomaster 5500 and Beomaster 5000 amplifiers so I know it works well.<br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiF1RvtxXCmisaPdoBu_raDg2WirgBPPciubcPHkeKnuomPuQ7nqiPNY5_qV5otc4gCEk8ZYJn1klPzdGwjvxojikb0YhSU-I5T6naT_PcFSlfXuQpX9emiU-ZmvPsaeIGCln9ep7o6ss5LK7fM3awJWHV7kSIyx2cAzlW5A5heERUnfBvyDo13wK0PtPjP/s2200/bm5500_2333_kt_ps_and_output_pcb_recap_05b.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="984" data-original-width="2200" height="286" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiF1RvtxXCmisaPdoBu_raDg2WirgBPPciubcPHkeKnuomPuQ7nqiPNY5_qV5otc4gCEk8ZYJn1klPzdGwjvxojikb0YhSU-I5T6naT_PcFSlfXuQpX9emiU-ZmvPsaeIGCln9ep7o6ss5LK7fM3awJWHV7kSIyx2cAzlW5A5heERUnfBvyDo13wK0PtPjP/w640-h286/bm5500_2333_kt_ps_and_output_pcb_recap_05b.jpg" width="640" /></a></div><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgl_wwN0VmwGktO6J1pbQgqq1Lhk3At0rxbR3i50UZvWEPxMMHGEcirO3jsLcnDgmlf6KE2M8Je56f49_ZrwW3BVBehpod5XDZFnlfOeOg1gEHQ3BadBHA3Cm5RVhRfUl3CUTJ0cwE2-VRyAPxu4x9p_QEAgnTkhyGB_hLhMEwuCfy13s-gHvJbEY8tm2fT/s2200/bm5500_2333_kt_ps_and_output_pcb_recap_06.jpg" style="clear: left; float: left; margin-bottom: 1em; margin-right: 1em;"><img border="0" data-original-height="1739" data-original-width="2200" height="506" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgl_wwN0VmwGktO6J1pbQgqq1Lhk3At0rxbR3i50UZvWEPxMMHGEcirO3jsLcnDgmlf6KE2M8Je56f49_ZrwW3BVBehpod5XDZFnlfOeOg1gEHQ3BadBHA3Cm5RVhRfUl3CUTJ0cwE2-VRyAPxu4x9p_QEAgnTkhyGB_hLhMEwuCfy13s-gHvJbEY8tm2fT/w640-h506/bm5500_2333_kt_ps_and_output_pcb_recap_06.jpg" width="640" /></a></div><br /><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /></div><div><br /><br /><br />The next steps are to re-install the output amplifier board heatsink assembly then re-install the boards back into the Beomaster 5500 cabinet.</div>sonavoraudiohttp://www.blogger.com/profile/04144547857529140916noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-45846143063466216892023-10-03T18:45:00.002-04:002023-10-07T15:59:30.700-04:00Beogram 4004 (Type 5526): Complete Functional Restoration and Installation of the Beolover Commander Remote Control<p style="text-align: justify;">This post describes the full functional restoration a the Beogram 4004 (Type 5526) that I recently received from a customer in California. My initial assessment of the unit is posted <a href="https://beolover.blogspot.com/2023/09/beogram-4004-first-impressions.html" target="_blank">here</a>.</p><p style="text-align: justify;">This shows the unit with the aluminum panels removed in as received condition:</p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7V6KfmIEPBZtB95eLuNqLTtNhWb9tW8U1pGiZogzjjFq22JTTOQhv1KMFQxQwBDtoBFI5QkwqwzcEzIG7x0hJTSFNB9ZQMQfovGXcBQOmDavVCvJNKLKGWUd0ku2_mrPkhQlh189TsjrIF0POclwOws-tT27TkO6SrsbPxrPxjIUSjUBAGhmoP-VqR38/s1200/1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj7V6KfmIEPBZtB95eLuNqLTtNhWb9tW8U1pGiZogzjjFq22JTTOQhv1KMFQxQwBDtoBFI5QkwqwzcEzIG7x0hJTSFNB9ZQMQfovGXcBQOmDavVCvJNKLKGWUd0ku2_mrPkhQlh189TsjrIF0POclwOws-tT27TkO6SrsbPxrPxjIUSjUBAGhmoP-VqR38/w640-h480/1.jpg" width="640" /></a></div><div style="text-align: justify;">As usual with DC motor Beograms, I started with the platter motor. This shows the extracted motor:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhgaJDQay8Amoxh9gmCCliaqkgqsIzSCb4dFmoE-y1tO9YxmpG6Fei4B3wCveWppf9Wjj0xFrzKIskyeRVInQ5FDx-ne2gYIaMSlcJqKfrW6EPoZ9_0V6BsgkoGqwpxhP7ei4bUbrWzwAowlUU4Jl4gv5B6R_K6zUWBbpj-tQFwCB1dlg6a94K0fxouTSg/s1200/2.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhgaJDQay8Amoxh9gmCCliaqkgqsIzSCb4dFmoE-y1tO9YxmpG6Fei4B3wCveWppf9Wjj0xFrzKIskyeRVInQ5FDx-ne2gYIaMSlcJqKfrW6EPoZ9_0V6BsgkoGqwpxhP7ei4bUbrWzwAowlUU4Jl4gv5B6R_K6zUWBbpj-tQFwCB1dlg6a94K0fxouTSg/w640-h480/2.jpg" width="640" /></a></div><div style="text-align: justify;">I took it apart to get to the bearings:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjcqvI7LU_MYmVbGEHTUvtqlQm0vLNQamhbWi9Hs1AhM1I3ALLDNcs9QXRVETQKywSEG7wKqa8qNg57cEMO8b18mMcPItFQSTvSBOTJhOoIu16ugtQGt2L-NuawcHWNfk6hATiMT-wA3IspvYlach4i_ZuO6LevmLR6k0p1uQ01MbL0DXeZBiyHrQk35_c/s1200/3.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjcqvI7LU_MYmVbGEHTUvtqlQm0vLNQamhbWi9Hs1AhM1I3ALLDNcs9QXRVETQKywSEG7wKqa8qNg57cEMO8b18mMcPItFQSTvSBOTJhOoIu16ugtQGt2L-NuawcHWNfk6hATiMT-wA3IspvYlach4i_ZuO6LevmLR6k0p1uQ01MbL0DXeZBiyHrQk35_c/w640-h480/3.jpg" width="640" /></a></div><div style="text-align: justify;">The bearings are the two small donuts on the black pad. These bearings usually have lost most of the oil stored in the porous Oilite bearing material. This causes the shaft of the motor to run dry with the consequence of RPM fluctuations. This can be remedied by submerging the bearings in motor oil under vacuum. This is shown here where strong bubbling can be seen coming from the two bearings after I pulled a vacuum:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjfJAyveN-LwJODuSDCUAM5tZ02SUhWwzJRKrodnQBVHQQoMFnYH-h2T0Ymsrpe_UgiIGSShXlqjxDxnFXxgAGt3EPAIwZfF8cBSz_K62YeXFYLBYbiZGEbql8Fwx-pDJb_LqFUAikDUiHXJXmPVXXKdne5WHYfRHNZPf40AZBtywT6cPGh1X32ToHwTs/s1200/4.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjfJAyveN-LwJODuSDCUAM5tZ02SUhWwzJRKrodnQBVHQQoMFnYH-h2T0Ymsrpe_UgiIGSShXlqjxDxnFXxgAGt3EPAIwZfF8cBSz_K62YeXFYLBYbiZGEbql8Fwx-pDJb_LqFUAikDUiHXJXmPVXXKdne5WHYfRHNZPf40AZBtywT6cPGh1X32ToHwTs/w640-h480/4.jpg" width="640" /></a></div><div style="text-align: justify;">The air bubbles come from the empty pores of the bearing. As the air is being extracted, oil diffuses into the bearings, which restores their ability to lubricate the motor shaft. This process usually takes 2-3 days. The ceasing of the bubbling indicates the end of the process. </div><div><div style="text-align: justify;">While the infusion process was happening, I focused on the other aspects of the restoration. The next step was cleaning and re-lubricating all the moving parts of the arm lowering and carriage transfer mechanisms. This shows the setup in its original condition: </div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjW9EpNsJGV3963f5VUu29ZZsKlMFezd3UfyX8d4CAr55eE9CY_1MzlMd5Bmp7kPGQl5_KACqa3haeKYVIOFrVlEvx96z7IdIciCzE3dHf74Jo3svoGC6aFAt_UBpQh3fRepT_BEapatemLsJH_o_y5tf_VD3SX8XBAfQk4Uy7yZabR4eDNDnJXorn5AKo/s1200/6.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjW9EpNsJGV3963f5VUu29ZZsKlMFezd3UfyX8d4CAr55eE9CY_1MzlMd5Bmp7kPGQl5_KACqa3haeKYVIOFrVlEvx96z7IdIciCzE3dHf74Jo3svoGC6aFAt_UBpQh3fRepT_BEapatemLsJH_o_y5tf_VD3SX8XBAfQk4Uy7yZabR4eDNDnJXorn5AKo/w640-h480/6.jpg" width="640" /></a></div><div style="text-align: justify;">And after removing the components for cleaning:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjB2k1qBp97fib4XpQEJyPoljXDCkyA8RPpixASGGLLaLB-oZmj9jArRgP77P0h7WeXDLmJY8zda8bMIQD8CnEep9g9Z4JUHcew2T1QU8iAayrhr8sZICPw9YIIuUGmbME_n_SbxC_k3n0cSbvV0f5OuvZE7sgruvhH9JSomlLgR-S5tgr8QI7coedt9P4/s1200/7.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjB2k1qBp97fib4XpQEJyPoljXDCkyA8RPpixASGGLLaLB-oZmj9jArRgP77P0h7WeXDLmJY8zda8bMIQD8CnEep9g9Z4JUHcew2T1QU8iAayrhr8sZICPw9YIIuUGmbME_n_SbxC_k3n0cSbvV0f5OuvZE7sgruvhH9JSomlLgR-S5tgr8QI7coedt9P4/w640-h480/7.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">This show all the parts before I put them into my ultrasonic cleaner:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuzOAEmkY3vCBF0jZJOh7DxESs22YDSq7NM2iaqw5G4llcBYRI4JrLfvL6lKGf97zatX9IYf3DEkWgMPyyPVuhe41Wx7OYq7SNkvXB4yeLeZClPVguATCTu6WNqu-aUiiNvN61PV4_oag_Ktg6xEcWdSBwXu8DAdi79CNO2Ew7wCM9XOevMEqgEoyyKDM/s1200/8.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuzOAEmkY3vCBF0jZJOh7DxESs22YDSq7NM2iaqw5G4llcBYRI4JrLfvL6lKGf97zatX9IYf3DEkWgMPyyPVuhe41Wx7OYq7SNkvXB4yeLeZClPVguATCTu6WNqu-aUiiNvN61PV4_oag_Ktg6xEcWdSBwXu8DAdi79CNO2Ew7wCM9XOevMEqgEoyyKDM/w640-h480/8.jpg" width="640" /></a></div><div style="text-align: justify;">While the parts were cleaning I removed the final moving part, the damper to arm linkage. It can be seen here from the back of the arms assembly, where it sticks out above the V-shaped notch in the arm that connects to the back of the counterweight assembly:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEioqdVmerLGTfoLrffz1u3O0ldhXYQ_olNm72ezPaNSwA27S0cDaUK-bAFvfkQ5tnin5yK2Nh-yP4-kyofina_aLEPPNn0SXOW-8tgIff9c65lQFq0jnonijW6UCm-boz_KYCRP8qrXtjPomMI0C58CUmZXXPyDZ-eUWOj_hAcETl0zYL_Z-xnHU6oQBTs/s1200/9.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEioqdVmerLGTfoLrffz1u3O0ldhXYQ_olNm72ezPaNSwA27S0cDaUK-bAFvfkQ5tnin5yK2Nh-yP4-kyofina_aLEPPNn0SXOW-8tgIff9c65lQFq0jnonijW6UCm-boz_KYCRP8qrXtjPomMI0C58CUmZXXPyDZ-eUWOj_hAcETl0zYL_Z-xnHU6oQBTs/w640-h480/9.jpg" width="640" /></a></div><div style="text-align: justify;">To get to this linkage the sensor arm needs to be removed. This shows it with the linkage removed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhluVmKIGiUUYNiW_k7j5lvXW0l56I5kmnuWO1jZyOpePe5p5AEWSQgNmzguP5Rbeb7uMtVh7FMIT8roukoEX83boCBZn9d9j7P9RZjRtbB2V8htadOhFU8WvjoGZXua9FxCaKuihagqi7Q88E-uKlftOft4517Z25T3bTWXnThkROs2hMN3BzAjmfKuQ4/s1200/10.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhluVmKIGiUUYNiW_k7j5lvXW0l56I5kmnuWO1jZyOpePe5p5AEWSQgNmzguP5Rbeb7uMtVh7FMIT8roukoEX83boCBZn9d9j7P9RZjRtbB2V8htadOhFU8WvjoGZXua9FxCaKuihagqi7Q88E-uKlftOft4517Z25T3bTWXnThkROs2hMN3BzAjmfKuQ4/w640-h480/10.jpg" width="640" /></a></div><div style="text-align: justify;">As usual, the small copper pad that helps the tonearm to move laterally when in up position had come loose. It is only attached with a double sided tape:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyCb2UG4Ow2XWF96MvgCa5cv4u2JmZfHxzWt377IbtY8R22GJyrljxBempzfioOV0UeDhAOAcJDrKiWQliKVPB2etaXKbEFfQ4p705ZfyduL78XnV2qF69G__VpHtIhoB3VLvJfnrlzYyrOMC0ZpCO4RAoBWjMkGXPm_02BIkwTybF-uFbjVZVYU6Evlg/s1200/11.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyCb2UG4Ow2XWF96MvgCa5cv4u2JmZfHxzWt377IbtY8R22GJyrljxBempzfioOV0UeDhAOAcJDrKiWQliKVPB2etaXKbEFfQ4p705ZfyduL78XnV2qF69G__VpHtIhoB3VLvJfnrlzYyrOMC0ZpCO4RAoBWjMkGXPm_02BIkwTybF-uFbjVZVYU6Evlg/w640-h480/11.jpg" width="640" /></a></div><div style="text-align: justify;">I glued it back into place with epoxy and reassembled the sensor arm. Then I put the cleaned parts back in. It is important to put a fresh gasket into the damper:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgTXAvylYkWv4G5zqAIVLOJfo8U7TTOAj55cQOtAVdt9D3HNma7_Uq7R0egmjRbdssERmAS33wEtRPMKdwmym6yNN7Lp9S8v-yybGHZ_CLURPDxjj4iOLtXMdXFuXICdsqAylMLWyxDxiIVXBdgbHSBn2bLD8JIFaD0AnwjahnhvDjfA2hbqL2wnGaPngg/s1200/12.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgTXAvylYkWv4G5zqAIVLOJfo8U7TTOAj55cQOtAVdt9D3HNma7_Uq7R0egmjRbdssERmAS33wEtRPMKdwmym6yNN7Lp9S8v-yybGHZ_CLURPDxjj4iOLtXMdXFuXICdsqAylMLWyxDxiIVXBdgbHSBn2bLD8JIFaD0AnwjahnhvDjfA2hbqL2wnGaPngg/w640-h480/12.jpg" width="640" /></a></div><div style="text-align: justify;">This ensures a reliable arm lowering experience. The original gaskets are often hardened, which causes inconsistencies in their ability to seal the airflow during the extension of the damper. This can cause sudden arm drops that can be harrowing experiences when there is a cherished $700 cartridge on the arm...;-). This shows all the shiny components back in place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdG0KG5WvHkdOLsVtuaW_-xTPRPuNe2TiYlWHBQsWGxDlqj7NAosBbBW-MLxoWIZtkw6RbrZ0hm_vhrEXDeeKjCJl2TlZaMrtTTguFvYKormDEfri2sDI_PrbMSVXCVg0MdqxMbSSkUhSue6fw2PYne8-djpKaFKlA9gU4cfVn_OZiSNdTS_GcQMiE2cY/s1200/13.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdG0KG5WvHkdOLsVtuaW_-xTPRPuNe2TiYlWHBQsWGxDlqj7NAosBbBW-MLxoWIZtkw6RbrZ0hm_vhrEXDeeKjCJl2TlZaMrtTTguFvYKormDEfri2sDI_PrbMSVXCVg0MdqxMbSSkUhSue6fw2PYne8-djpKaFKlA9gU4cfVn_OZiSNdTS_GcQMiE2cY/w640-h480/13.jpg" width="640" /></a></div><div style="text-align: justify;">Next was the replacement of the cracked plastic carriage pulley with a precision machined aluminum reproduction:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKOoHlTdYrwqsLWvbRHp_Y7sF7Ffmzxvk3DSFQz9YUepNaN6Q24PAc6FYD-bh-oK-esuRlWfSZOxvbljhxMbNfImyLy6EBID8pShBUAM1OBv_KL-T5aqj1vJ0o4_K2OsZxzk9q03qe1Q74n7cjqCvoqvlvfOSjbD2-Uz7c6nlJ-kzt4Hl02cZmnnKrQyQ/s1200/15.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKOoHlTdYrwqsLWvbRHp_Y7sF7Ffmzxvk3DSFQz9YUepNaN6Q24PAc6FYD-bh-oK-esuRlWfSZOxvbljhxMbNfImyLy6EBID8pShBUAM1OBv_KL-T5aqj1vJ0o4_K2OsZxzk9q03qe1Q74n7cjqCvoqvlvfOSjbD2-Uz7c6nlJ-kzt4Hl02cZmnnKrQyQ/w640-h480/15.jpg" width="640" /></a></div><div style="text-align: justify;">The next task on the restoration of the carriage was the replacement of the original incandescent bulb in the tracking sensor with an LED based assembly. This shows the original black bulb housing still in place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjnnlycJgswyDTapUNL3xpg_dlNJBAHrRw0oHmFzv9vRMe4Gk-g2W0kyqBQMnYEmDcXGv9BOHWnvnuQAid6Ng94VX0RK0xsZd5HCc_VR5ChREnx5D6Ag8oFXIsT3d83qJXygc9uaH1OX2GDfLjNSwwMWVEEiIDVh5TLbu4_5GalnCDtppFpXsHxWrOo0Go/s1200/16.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjnnlycJgswyDTapUNL3xpg_dlNJBAHrRw0oHmFzv9vRMe4Gk-g2W0kyqBQMnYEmDcXGv9BOHWnvnuQAid6Ng94VX0RK0xsZd5HCc_VR5ChREnx5D6Ag8oFXIsT3d83qJXygc9uaH1OX2GDfLjNSwwMWVEEiIDVh5TLbu4_5GalnCDtppFpXsHxWrOo0Go/w640-h480/16.jpg" width="640" /></a></div><div style="text-align: justify;">Here one can see it after removal together with its Beolover LED replacement:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhGOngYvHtJBStCjUqJa8TKl1QNT2vCY7f9zLPAEwzk84Tx8VNqHnM3X7PORR_HZMs_Ki9eY7wg84inKCT5tBJH74WjiRaAf9jQJCBeqMH6USnKPREAZpk02MHOMt-oYNj04zMwY9OgW4sXKTDNOw8ggXaaCiAbLdWjxvD1y3e5gJdgTw6U1lNBsThuMLg/s1200/17.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhGOngYvHtJBStCjUqJa8TKl1QNT2vCY7f9zLPAEwzk84Tx8VNqHnM3X7PORR_HZMs_Ki9eY7wg84inKCT5tBJH74WjiRaAf9jQJCBeqMH6USnKPREAZpk02MHOMt-oYNj04zMwY9OgW4sXKTDNOw8ggXaaCiAbLdWjxvD1y3e5gJdgTw6U1lNBsThuMLg/w640-h480/17.jpg" width="640" /></a></div><div style="text-align: justify;">The small SMD LED is in the location where the light bulb filament is situated in the original part. This shows it implanted:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg_YH_lAEaalA52X9K5O-8EX4q8BdDHJmeNKLRtGTI2AWLzzFKdCwxDgwHGQfcNjxaL-Tde6Vy8PbeIjyffFNjkV_5o_7BtT7EFIkgVDMYvh2u_TF9ef-g1QVaADFup_sqpWzs9wGogl85vykuAn3JqwXdlSU5HRDR0-CGS8v2CfSWBss8Q26Pe2Aq_y_U/s1200/18.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg_YH_lAEaalA52X9K5O-8EX4q8BdDHJmeNKLRtGTI2AWLzzFKdCwxDgwHGQfcNjxaL-Tde6Vy8PbeIjyffFNjkV_5o_7BtT7EFIkgVDMYvh2u_TF9ef-g1QVaADFup_sqpWzs9wGogl85vykuAn3JqwXdlSU5HRDR0-CGS8v2CfSWBss8Q26Pe2Aq_y_U/w640-h480/18.jpg" width="640" /></a></div><div style="text-align: justify;">There is one more bulb to be replaced on the carriage assembly, the one in the sensor arm. This shows the small compartment pulled out with the original bulb and the LED replacement next to it:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOA3pqNZthlXQwfAbylvEPZpHb66tv747aGYK4qKNtLTDguKswfhABXz30EIxrfgYOidjPRFRu9fYpSLdx6MbD6l9zBH1O3YWRER2yEbxlub23TWxHIk7LfDVJ8vNKb7NKMkzluQlvRsBW18JKmvirlYUkRsLB4G1DBpAPvN829JdZw6874VYz2hDyQlk/s1200/19.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOA3pqNZthlXQwfAbylvEPZpHb66tv747aGYK4qKNtLTDguKswfhABXz30EIxrfgYOidjPRFRu9fYpSLdx6MbD6l9zBH1O3YWRER2yEbxlub23TWxHIk7LfDVJ8vNKb7NKMkzluQlvRsBW18JKmvirlYUkRsLB4G1DBpAPvN829JdZw6874VYz2hDyQlk/w640-h480/19.jpg" width="640" /></a></div><div style="text-align: justify;">And after replacement of the bulb:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXMJ9g3ggODWuJ4RRY68g5RSqFtNeAY-WncLzFQYF4iBK8ijgySW11Hpuu0nGG4Lzyfa-SlKaCSq7DQUu4LlnHBfP54bPuIWz5szdigtn-ak4sW4yVG5EKb3NbZ0309mBORVIvxMHSzzJ4W7LLiDI-HJd6v1Jy798wCMnSsIKINw6KtLsw6e01fpSJXX0/s1200/20.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXMJ9g3ggODWuJ4RRY68g5RSqFtNeAY-WncLzFQYF4iBK8ijgySW11Hpuu0nGG4Lzyfa-SlKaCSq7DQUu4LlnHBfP54bPuIWz5szdigtn-ak4sW4yVG5EKb3NbZ0309mBORVIvxMHSzzJ4W7LLiDI-HJd6v1Jy798wCMnSsIKINw6KtLsw6e01fpSJXX0/w640-h480/20.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the LED in action. Since it is a special warm light white LED with a sizable red photon emission in its spectrum it is able to light up the B&O logo as beautifully as the original incandescent bulb:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdIeMZyd6QnKRChopUJeeCPdu7yUQXZB6T40bcZtdYYcfZZgJdyoonynrAKqGVpM9MLAl-noJw5IEyyxdDZ9pjzVW84l3JKhMNba4PEbfgBjBRxnh3F_JGu7Rj7q6s6BdTU6UbFTN3Uu0_b3h2sRpmia6TqMYDX2kFsTdf0lc5Or_wjMy0VnTyfRVQjuo/s1200/21.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhdIeMZyd6QnKRChopUJeeCPdu7yUQXZB6T40bcZtdYYcfZZgJdyoonynrAKqGVpM9MLAl-noJw5IEyyxdDZ9pjzVW84l3JKhMNba4PEbfgBjBRxnh3F_JGu7Rj7q6s6BdTU6UbFTN3Uu0_b3h2sRpmia6TqMYDX2kFsTdf0lc5Or_wjMy0VnTyfRVQjuo/w640-h480/21.jpg" width="640" /></a></div><div style="text-align: justify;">After completing the carriage assembly I focused on the RPM adjustment panel. It contains two light bulbs, which I usually also replace. They often fail, and that does not look very good! But the main reason to update the bulbs with LEDs is the much lower heat emission of LEDs. The hot bulbs have a tendency to cause RPM variations when they heat up the RPM trimmers that are situated right next to them. </div></div><div><div style="text-align: justify;">This shows the panel after I extracted it:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWiuAycxlqb_YrRMpV-RVgn0UiCg5YpbT25n75NT_bbRq3f8NdCJx7GHOJQHzbfcbi-jXxCkaPZjm0DgxxBNhDVh4rtMnZyq_jhnZHWBPszK1nj7AJo1q4gO6akszefkRz0PYcfE8G9L2PeBWNkE31c1_KbPXuQg_1HfgQTTES9v64v6-2kFQ_1oDqCM0/s1200/22.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhWiuAycxlqb_YrRMpV-RVgn0UiCg5YpbT25n75NT_bbRq3f8NdCJx7GHOJQHzbfcbi-jXxCkaPZjm0DgxxBNhDVh4rtMnZyq_jhnZHWBPszK1nj7AJo1q4gO6akszefkRz0PYcfE8G9L2PeBWNkE31c1_KbPXuQg_1HfgQTTES9v64v6-2kFQ_1oDqCM0/w640-h480/22.jpg" width="640" /></a></div><div style="text-align: justify;">Removal of the bulb covers reveals the bulbs:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilXDLIr7feXFjszk16_vUFkRIPAJDWWgedkwy1xGhco0XekLLEHZMbTYEAXNstvGwXZcvtC_Cjv_6FDAxVFF7NLmgybH9Ig3C4ouEGNXfzZYZetPb023ukUlVTNs-vnf0lCQY31Apy5FVBraTtK6g8dtIKwkLa7J-z0IlOrdg4TSwkQHjYCMIF1sASIvc/s1200/23.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEilXDLIr7feXFjszk16_vUFkRIPAJDWWgedkwy1xGhco0XekLLEHZMbTYEAXNstvGwXZcvtC_Cjv_6FDAxVFF7NLmgybH9Ig3C4ouEGNXfzZYZetPb023ukUlVTNs-vnf0lCQY31Apy5FVBraTtK6g8dtIKwkLa7J-z0IlOrdg4TSwkQHjYCMIF1sASIvc/w640-h480/23.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the bulbs removed and the small Beolover LED replacement assemblies:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQMdNEezRRaplL6VbzQO2Z_3BK8OGaOtRYJ45fHjWt2iHEjEN3jX44mvcuW3e-PAsg9-DZE0Mubur2y6xXTNcUPhTCSghot0MUv6gI_dxr3GAS3xv01PdwEn4vjJ4jIOM4v-fbkAI3TqFl__-e6WJRnmxECad4eAUVyHIvJnORyNqX1cBxViPITRpILew/s1200/24.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgQMdNEezRRaplL6VbzQO2Z_3BK8OGaOtRYJ45fHjWt2iHEjEN3jX44mvcuW3e-PAsg9-DZE0Mubur2y6xXTNcUPhTCSghot0MUv6gI_dxr3GAS3xv01PdwEn4vjJ4jIOM4v-fbkAI3TqFl__-e6WJRnmxECad4eAUVyHIvJnORyNqX1cBxViPITRpILew/w640-h480/24.jpg" width="640" /></a></div><div style="text-align: justify;">They solder directly to the terminals that the bulbs connect to:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaIo22Cim-4v3Fnw5crQJtkMzYZfvVcRt6kVFwKpzKGBdh473kpoIUuTUUT5wizn6XAIZGQJybySu82jjVimg8GmsWtEUGXjQcgV-0oXgbOTVaMMqA6xwX1vj21ands9YkMQNjgHHr9fi6UBjUNcIXdeqsjHK2qVb_LrEdq1PiCYzdgF6ZcErATiZWd-I/s1200/25.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgaIo22Cim-4v3Fnw5crQJtkMzYZfvVcRt6kVFwKpzKGBdh473kpoIUuTUUT5wizn6XAIZGQJybySu82jjVimg8GmsWtEUGXjQcgV-0oXgbOTVaMMqA6xwX1vj21ands9YkMQNjgHHr9fi6UBjUNcIXdeqsjHK2qVb_LrEdq1PiCYzdgF6ZcErATiZWd-I/w640-h480/25.jpg" width="640" /></a></div><div style="text-align: justify;">The bulb covers can be replaced after installation. The LED boards do not interfere with them:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXn9Jmpo50P3rbGzAGHoWBn3phqHm5NdPPw6OFwRvTDTui6VnX0SynENCB3Po_kcM4GA_DWLPQ3cCmag-D7AvqRNQAY77AX81ME62y3uD-vyMKkWNzYZ0C9g9Jhj-_wCkAE8fkVkRDyG9kJaMkT89PvBwF1uwKQ0IG3xF6Y6fdZBM_ONAJCG4PpS3mEXc/s1200/26.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgXn9Jmpo50P3rbGzAGHoWBn3phqHm5NdPPw6OFwRvTDTui6VnX0SynENCB3Po_kcM4GA_DWLPQ3cCmag-D7AvqRNQAY77AX81ME62y3uD-vyMKkWNzYZ0C9g9Jhj-_wCkAE8fkVkRDyG9kJaMkT89PvBwF1uwKQ0IG3xF6Y6fdZBM_ONAJCG4PpS3mEXc/w640-h480/26.jpg" width="640" /></a></div><div style="text-align: justify;">Now it was time to restore the main PCB. The first step is usually to replace the power transistors that are mounted on the solder side of the board. This process is done best with the board still installed since that makes it easy to place the new devices in the proper spot so they line up with the heat sinks and their solder points. This shows one of the original ones, a TIP120 in place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEggfpolHX2ZjprkkePvBgspjnqKJaBLWQxzD3OWu3qFjTKQ6fz9ajWxGHOEhkq1xd7x-Dbwhi0HGGFH7NyzEc5oRH1vhF_XqnTRfj1P74ejgz0EPpTYvTzav0sZcxj32UP5Bc1OriqWmoHWmguDDbsJr0kSg11pZfO8PcHmbG1GyCYmWfOKHw30b7tS0_g/s1200/27.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEggfpolHX2ZjprkkePvBgspjnqKJaBLWQxzD3OWu3qFjTKQ6fz9ajWxGHOEhkq1xd7x-Dbwhi0HGGFH7NyzEc5oRH1vhF_XqnTRfj1P74ejgz0EPpTYvTzav0sZcxj32UP5Bc1OriqWmoHWmguDDbsJr0kSg11pZfO8PcHmbG1GyCYmWfOKHw30b7tS0_g/w640-h480/27.jpg" width="640" /></a></div><div style="text-align: justify;">I replaced it with a stronger TIP102 and a 100nF capacitor on its output:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjcglbajglRKIeRBuiAIpfbupoEehoykD3r9QHwIvgKswX1cksdBnORjEBlUz9gvwlSUaUEOD-X9IGWkrWk0KEIdl1fCMqM0vYRKCQJR9-cjbOHf5iVBkvdSv8pYtGoid0mBnD_eXmEK9tGBfOilLekTyWrF-Cl7i1f7VyxgVtLxByXCG_nXTOKW1sGOlI/s1200/28.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjcglbajglRKIeRBuiAIpfbupoEehoykD3r9QHwIvgKswX1cksdBnORjEBlUz9gvwlSUaUEOD-X9IGWkrWk0KEIdl1fCMqM0vYRKCQJR9-cjbOHf5iVBkvdSv8pYtGoid0mBnD_eXmEK9tGBfOilLekTyWrF-Cl7i1f7VyxgVtLxByXCG_nXTOKW1sGOlI/w640-h480/28.jpg" width="640" /></a></div><div style="text-align: justify;">The capacitor stabilizes the output of the transistor. For some reasons the modern TIP versions tend to have some high frequency oscillations in this circuit design, which can cause issues with the record detection circuitry. </div></div><div><div style="text-align: justify;">After the power transistor are replaced, the board can be removed for access to the remaining components to be replaced:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5CplEPPGRmjBeoLziI8dRNMAN9w25VQOsRT476Cxg05kp_tW5lkRS2naCFUITYLON0TbdHDyjT5jn_YK3a50aHP7NTtDl1OVJb6Yylnmv_-LpFEFG2wwGkx2XgnN4DBnv1vSMRTxsad3QKvO8jpndQcm-TLctmCXKQQbOw7cftFilvvUnw7uefFT8_6Y/s1200/29.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh5CplEPPGRmjBeoLziI8dRNMAN9w25VQOsRT476Cxg05kp_tW5lkRS2naCFUITYLON0TbdHDyjT5jn_YK3a50aHP7NTtDl1OVJb6Yylnmv_-LpFEFG2wwGkx2XgnN4DBnv1vSMRTxsad3QKvO8jpndQcm-TLctmCXKQQbOw7cftFilvvUnw7uefFT8_6Y/w640-h480/29.jpg" width="640" /></a></div><div style="text-align: justify;">I usually replace all the electrolytic capacitors, the power transistors, the RPM relay and RPM trimmers, as well as the sensor transistor and its biasing resistor. This shows the rebuilt board with the extracted components:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZXVWZuOTC3YTCx_QFkrFmOSlpkupstllXzGPaV0w-D9MY_IGQnbR6lJRMR7-kzhNKIQVtYzXCxU-FxYzAMvpRFKGotrTQsTQ_G5IEvvd24xUktdbYpzX5yrAkLw3lXRm1jnqZGD9_iBxL2xAj4ekalD1Tx6tPVCzY7A-bk-w7oYNH3hkedmOne1srE8E/s1200/30.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZXVWZuOTC3YTCx_QFkrFmOSlpkupstllXzGPaV0w-D9MY_IGQnbR6lJRMR7-kzhNKIQVtYzXCxU-FxYzAMvpRFKGotrTQsTQ_G5IEvvd24xUktdbYpzX5yrAkLw3lXRm1jnqZGD9_iBxL2xAj4ekalD1Tx6tPVCzY7A-bk-w7oYNH3hkedmOne1srE8E/w640-h480/30.jpg" width="640" /></a></div><div style="text-align: justify;">The other board that needs restoration is the output board. It is located under the keypad. I removed the keypad and the board. This shows it in its 'original' condition. Someone replaced the output relay with a not matching relay and did an interesting wiring job to make the necessary connections:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEji5IgP2UZjgo87fC8bR9TfluLKnADRQgmi9b7kdKe0ef-iR4vBYwOAste8A8zZdKtEZalKciRVKJl23LcqI-qFwouHusHHTbeD2nkCX2vXTCFLKRo9tGbwv_jEEc4MAyOUx4GI5PbZxlCm40GFIlhoU-ve7Aq3stLk-omHAt-UqvF8L2gUIjQl775Qxjo/s1200/31.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEji5IgP2UZjgo87fC8bR9TfluLKnADRQgmi9b7kdKe0ef-iR4vBYwOAste8A8zZdKtEZalKciRVKJl23LcqI-qFwouHusHHTbeD2nkCX2vXTCFLKRo9tGbwv_jEEc4MAyOUx4GI5PbZxlCm40GFIlhoU-ve7Aq3stLk-omHAt-UqvF8L2gUIjQl775Qxjo/w640-h480/31.jpg" width="640" /></a></div><div style="text-align: justify;">Her you see the beautiful work in all its 'splendor'!...;-):</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEix9xFexZHa6ML7UlgqqWewFYZDO1DZKdQ01CAE1bm4vQGR-rSiaea8TZyKPcv4NNOJ-IxWJPCS72zuSGb5bjzHsefykcb_zazYyodyDzBq19EOU0IBPemLowkYVa8tZlfhHvrDAviRxagZvhHao5lnrAVWB7bjbEsJAWxcE_JmThRDDYvnZNguSAR_LDU/s1200/32.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEix9xFexZHa6ML7UlgqqWewFYZDO1DZKdQ01CAE1bm4vQGR-rSiaea8TZyKPcv4NNOJ-IxWJPCS72zuSGb5bjzHsefykcb_zazYyodyDzBq19EOU0IBPemLowkYVa8tZlfhHvrDAviRxagZvhHao5lnrAVWB7bjbEsJAWxcE_JmThRDDYvnZNguSAR_LDU/w640-h480/32.jpg" width="640" /></a></div><div style="text-align: justify;">I removed the relay and installed a proper Beolover replacement assembly that uses a modern encapsulated SMD relay on a custom designed adapter board. I also replaced the electrolytic capacitors and I installed a switch with which one can connect system and signal grounds if there is a hum. This shows the rebuilt board with the removed components:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_MCfAqvrLYNaVpH4XsULM69K4DN-2MYLzl_Vf-curpFGRlIuyL4DtgitHjkQAwKkrrf5a5-y0GhIRsGBty_wxhil8MX009703xjcKGqYsjsxnDg7EZLv0qR08YccMC-OQ7vqUpIH-OdiUJ1pe9aZ2o9aVehL38P-DzO04hNdjSFCHTsodM81Tz1NzwaQ/s1200/33.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_MCfAqvrLYNaVpH4XsULM69K4DN-2MYLzl_Vf-curpFGRlIuyL4DtgitHjkQAwKkrrf5a5-y0GhIRsGBty_wxhil8MX009703xjcKGqYsjsxnDg7EZLv0qR08YccMC-OQ7vqUpIH-OdiUJ1pe9aZ2o9aVehL38P-DzO04hNdjSFCHTsodM81Tz1NzwaQ/w640-h480/33.jpg" width="640" /></a></div><div style="text-align: justify;">Here a detail shot of the relay and grounding switch:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiR0U9UT3IaZ2bsaoKE96Kwx3mWrFlXLL2XE1Iq5ZV3wY-YHSlhBSiEOmknh86IbgaQLHfuFTxPrydxKgnN-qwwuZD0cAp4MREXkAIyXMgiNk49tkGpeC1oSgqYMPtc2CvcrRbXA8B-XuvEW0hnfQLDM-4p9eMxpltyNF9U_qGdIvC6b04F4w9zMf20il0/s1200/34.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiR0U9UT3IaZ2bsaoKE96Kwx3mWrFlXLL2XE1Iq5ZV3wY-YHSlhBSiEOmknh86IbgaQLHfuFTxPrydxKgnN-qwwuZD0cAp4MREXkAIyXMgiNk49tkGpeC1oSgqYMPtc2CvcrRbXA8B-XuvEW0hnfQLDM-4p9eMxpltyNF9U_qGdIvC6b04F4w9zMf20il0/w640-h480/34.jpg" width="640" /></a></div><div style="text-align: justify;">At this point it was time to clean out the enclosure from the transport lock bushings mess. The bushings had deteriorated into small fragments that were distributed around the enclosure. I removed the floating chassis and the remaining components. This shows the emptied out enclosure bottom with all the fragments strewn around:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvml0iUqTTEcuNuJhMDXrYOpKRvWc5NnYYcQFFLhkZz0SqdHlP2XatY6zfcf4Kg6R1c3rae7bx7yr7mhTaIWcfInQXc9pU2XGxhx9eGjkoGhMNXaKOeLlqE6VosoQyBIfAvKxfhi4eBPFPs2at6d43M059v9k3eE3Ly-3whavRvUXv6lAr6XKqlM2bfCs/s1200/35.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvml0iUqTTEcuNuJhMDXrYOpKRvWc5NnYYcQFFLhkZz0SqdHlP2XatY6zfcf4Kg6R1c3rae7bx7yr7mhTaIWcfInQXc9pU2XGxhx9eGjkoGhMNXaKOeLlqE6VosoQyBIfAvKxfhi4eBPFPs2at6d43M059v9k3eE3Ly-3whavRvUXv6lAr6XKqlM2bfCs/w640-h480/35.jpg" width="640" /></a></div><div style="text-align: justify;">I vacuumed them out:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMDYB0y8ts7rKYAcHk3nGe3eL2Q-nRGc-MPqXYmVmWC9U3HJOeTGxGOkI0mzKwJb5nQlwekjHQFSZ8SfQwHRqnTI631oRJiJyjfhGp_5e5_eTN5Cn1H6cXZv0zCfqySGkDv_rZqJqCcLNCONQi74-cLj8Vp29DX6g2FfBaDzEN5bWGMJ39m-C-om2zA8E/s1200/36.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgMDYB0y8ts7rKYAcHk3nGe3eL2Q-nRGc-MPqXYmVmWC9U3HJOeTGxGOkI0mzKwJb5nQlwekjHQFSZ8SfQwHRqnTI631oRJiJyjfhGp_5e5_eTN5Cn1H6cXZv0zCfqySGkDv_rZqJqCcLNCONQi74-cLj8Vp29DX6g2FfBaDzEN5bWGMJ39m-C-om2zA8E/w640-h480/36.jpg" width="640" /></a></div><div style="text-align: justify;">Now it was time to install new Beolover transport lock bushings. My design comes in two halves, which makes it a snap to install them. This shows them before installation:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0qR43SAVD1rp3CCJDjLCU9M4PKgj9-jL2RWNlkVqA3Sn_GIJKon_aDsr9QmtQuOx_DoP0xogkAoyn53rqmfkE9s6SGiiT8sLKy5AaN2wLd3ghgrlQ-BEUJ5XvzVVtjPthxUL3-fwH9hFKYbzMavgENN6temrjuPINFyuUAfzwpR7MB9FOY2Uwm7Gqi6g/s1200/37.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg0qR43SAVD1rp3CCJDjLCU9M4PKgj9-jL2RWNlkVqA3Sn_GIJKon_aDsr9QmtQuOx_DoP0xogkAoyn53rqmfkE9s6SGiiT8sLKy5AaN2wLd3ghgrlQ-BEUJ5XvzVVtjPthxUL3-fwH9hFKYbzMavgENN6temrjuPINFyuUAfzwpR7MB9FOY2Uwm7Gqi6g/w640-h480/37.jpg" width="640" /></a></div><div style="text-align: justify;">Here you can see one of the bushings installed around the transport lock bolt:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjDWZ9eFFrbD8vr7QvZuw3p5j6BR4ThRBYRpLmpiDI9LW4AhYKMrdrjuFKl2sySpNyVLzCa5XYxNgn-rgabEOtMJXJbglxSPjFHjXcKq9cf9IyluKdGj4A6LckTJw0gvcC7Wse7fp4dcfnKez3rCn17-45iyr2biGPoxk_EToxyel2h39WOjAr37KnS4no/s1200/38.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjDWZ9eFFrbD8vr7QvZuw3p5j6BR4ThRBYRpLmpiDI9LW4AhYKMrdrjuFKl2sySpNyVLzCa5XYxNgn-rgabEOtMJXJbglxSPjFHjXcKq9cf9IyluKdGj4A6LckTJw0gvcC7Wse7fp4dcfnKez3rCn17-45iyr2biGPoxk_EToxyel2h39WOjAr37KnS4no/w640-h480/38.jpg" width="640" /></a></div><div style="text-align: justify;">I reinstalled the floating chassis with all three bushings restored. Then I installed a new reservoir capacitor. This shows the original one:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6PbwU5bF1AGb7uOqt1bGHBDBMGHfmo_WhGoB0EXtr-UenEUsn7-p9ZB496VyMimgfNtQwBwlUCCfPT3C-uY9lYdNgBGiNIki61G1FEJmRaNR2Na2MxCYsAxyWGezDDHdIlwuPxhb-5OM-J2NRq_vJ15avwQrEhTiYIBf1bEFyRay7EjIeSIpLOYRoqAw/s1200/39.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg6PbwU5bF1AGb7uOqt1bGHBDBMGHfmo_WhGoB0EXtr-UenEUsn7-p9ZB496VyMimgfNtQwBwlUCCfPT3C-uY9lYdNgBGiNIki61G1FEJmRaNR2Na2MxCYsAxyWGezDDHdIlwuPxhb-5OM-J2NRq_vJ15avwQrEhTiYIBf1bEFyRay7EjIeSIpLOYRoqAw/w640-h480/39.jpg" width="640" /></a></div><div style="text-align: justify;">They are prone to leaking at this age, so it is a good idea to replace them. I use a modern replacement with a smaller form factor for the same capacitance, and I use a 3D printed adapter to make it fit properly into the original spot:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhfOKFP6uoORSX9h-gLUg324ElRCQXBb7lv6g8AXsAXImSBhNuTg-DF_IiCw_J9xG4lU49kbIFDNllmn2EIEqU2TmceoSvNPjpFaLkz38MZTqepquLODZC7pPeXvdiCeKAgCSMzKla_pgM15gwKYphCVYfkzM7VuYoksbIOoHNQfUw8yW4MaYVI9783mI/s1200/40.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhfOKFP6uoORSX9h-gLUg324ElRCQXBb7lv6g8AXsAXImSBhNuTg-DF_IiCw_J9xG4lU49kbIFDNllmn2EIEqU2TmceoSvNPjpFaLkz38MZTqepquLODZC7pPeXvdiCeKAgCSMzKla_pgM15gwKYphCVYfkzM7VuYoksbIOoHNQfUw8yW4MaYVI9783mI/w640-h480/40.jpg" width="640" /></a></div><div style="text-align: justify;">Now it was time to do some adjustments. First I adjusted the bias of the sensor transistor TR3 to get the prescribed 4V at its collector:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiT-2Wgc1cFYHDb4Q88X8AINvfWCUhgpBg5C4H5liFNbvn1JNXnQMT3GczBauEqUqS7gVX62sh09KCpARDcSP9_EZXw1quJrOtXnVawgXm1NPfXVRlQ_3QtRVuc475ayRSbZw8S8bR_cm_f6lBjXhVUEHlMuMftsVbXUDasxuy-eyM87k-35YsEjWdZy2A/s1200/41.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiT-2Wgc1cFYHDb4Q88X8AINvfWCUhgpBg5C4H5liFNbvn1JNXnQMT3GczBauEqUqS7gVX62sh09KCpARDcSP9_EZXw1quJrOtXnVawgXm1NPfXVRlQ_3QtRVuc475ayRSbZw8S8bR_cm_f6lBjXhVUEHlMuMftsVbXUDasxuy-eyM87k-35YsEjWdZy2A/w640-h480/41.jpg" width="640" /></a></div><div style="text-align: justify;">Then I installed the trimmer below deck on the component side of the main PCB and measured the sensor response with the new transitor. I got an impressive 8V amplitude of the sensor signal, which exceeds the spec stated in the manual:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjuKQn1BGToETzlof06yv_xzAICulPLWCKotUnW4Fw0l_T2_Ai-BgcaZ22tRQInGpe-Dy1WLY7tZUCNkwQcbORLLN7WIrppSZqd3KniSn-Lwkjq5yA3cVsSYZAQ1bDgRGWvrX_6pM_DiMtR84Ph0d268AjHImF9L1TD9r-rVtOiWQ3jHt_xpgGE0_tSHnw/s1200/42.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjuKQn1BGToETzlof06yv_xzAICulPLWCKotUnW4Fw0l_T2_Ai-BgcaZ22tRQInGpe-Dy1WLY7tZUCNkwQcbORLLN7WIrppSZqd3KniSn-Lwkjq5yA3cVsSYZAQ1bDgRGWvrX_6pM_DiMtR84Ph0d268AjHImF9L1TD9r-rVtOiWQ3jHt_xpgGE0_tSHnw/w640-h480/42.jpg" width="640" /></a></div><div style="text-align: justify;">Each dip of the signal corresponds to a black platter rib passing under the sensor. This allows the Beogram to 'see' if there is a record (no signal) or no record (dips like shown above).</div></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">The next step was to remedy the strongly bent alignment pins for the aluminum plates. Someone had bent them completely down so they would not touch the aluminum plates. Not very Beolovely, but I can understand the motivation for a regular electronic shop to do it since it can be pretty tedious to adjust their orientation to make the aluminum plates fit properly. Bending them out of the way allows putting the plates in, and as long as the deck is not moved, they stay in place due to gravitation. But of course that is not the way is is supposed to be. This shows one of the pins in its as received bent shape:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIZgPZeNd9HTarh-9GI_AxFhSuNYAusQlQpBwU9tciBB8980j9GmUm9Ret8VPxOYgXCVKdgG_wJu4ueTJcnPzl83rfnhtGHlb2aWSmCnyroHAy-Svsk7bXlHMp_nWZZ9RT1fm7Wmx61ZxtuLNew8DwbEAWxghYuE2RYV3aqErZHp4VA9tHLVLM9oU4lfo/s1200/5.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjIZgPZeNd9HTarh-9GI_AxFhSuNYAusQlQpBwU9tciBB8980j9GmUm9Ret8VPxOYgXCVKdgG_wJu4ueTJcnPzl83rfnhtGHlb2aWSmCnyroHAy-Svsk7bXlHMp_nWZZ9RT1fm7Wmx61ZxtuLNew8DwbEAWxghYuE2RYV3aqErZHp4VA9tHLVLM9oU4lfo/w640-h480/5.jpg" width="640" /></a></div><div style="text-align: justify;">Here you can see one of them bent back into the proper position:</div><div style="text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtaqMicoy2X9Jzu3WWjk68pInKFNU6VT7E75859_Xwuh0XD2MZxtCXCxlmpGSoKD4ZAOGExWel8-bn2CI400BkBQWnjtclcedS6ougQu47VMqJLgy_m6iDaU5nnuZ7ViI0XGMptT9O7JZXJVgQsDZFZbT-Ngc6-K7Y_ONl3-wQ9wZ9GrLEEejAk62EMX0/s1200/43.jpg" style="margin-left: 1em; margin-right: 1em; text-align: center;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtaqMicoy2X9Jzu3WWjk68pInKFNU6VT7E75859_Xwuh0XD2MZxtCXCxlmpGSoKD4ZAOGExWel8-bn2CI400BkBQWnjtclcedS6ougQu47VMqJLgy_m6iDaU5nnuZ7ViI0XGMptT9O7JZXJVgQsDZFZbT-Ngc6-K7Y_ONl3-wQ9wZ9GrLEEejAk62EMX0/w640-h480/43.jpg" width="640" /></a></div><div style="text-align: justify;"><br /></div><div style="text-align: justify;">With the top plates aligned, I focused on adjusting the arm to platter height, floating chassis level, alignment of the platter with the opening in the aluminum panel that surrounds it. This is usually a routine process, which is a bit tedious since it can take a while, needing multiple iterations until everything is aligned properly.</div><div style="text-align: justify;">In this particular case, however, the process went 'beyond routine' when I adjusted the floating chassis. This is done by turning the adjustment nuts that allow tuning the vertical position of the leaf springs that float the chassis. You can see one of the nuts in the picture above. It is located behind the alignment pin. When I turned it it twisted off the bolt. It turned out that someone had epoxied the nuts into place and I did not see that I did not turn the nut on the threads, but rather the bolt itself. The bolt broke off surprisingly easily, which can be explained by the fact that it seems made from aluminum. This shows the broken off bolt with nut:</div><div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7llnd3YpABxKIjWZcuijFMga-9tuJQuGNJ59_L6ILMHlYYRCmTlB0yGN5tKpzsAicRn07_2vY38Wcn0DdcNG5z-FKO-cB2yY5rxFWeQK14jrv2SxBZBhRn6-ct0ulbGe95cciNJ3Rq6hJM2zLoJBfELi5SrvHFd2OuorROpjMb4CWZrxM_m94j20FXQM/s1200/44.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="899" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7llnd3YpABxKIjWZcuijFMga-9tuJQuGNJ59_L6ILMHlYYRCmTlB0yGN5tKpzsAicRn07_2vY38Wcn0DdcNG5z-FKO-cB2yY5rxFWeQK14jrv2SxBZBhRn6-ct0ulbGe95cciNJ3Rq6hJM2zLoJBfELi5SrvHFd2OuorROpjMb4CWZrxM_m94j20FXQM/w640-h480/44.jpg" width="640" /></a></div><div style="text-align: justify;">I made a <a href="https://beolover.blogspot.com/2023/09/beogram-4004-ripped-off-leaf-spring-adjustment-screw.html" target="_blank">separate post that shows how I drilled out the stuck part of the bolt</a>. This shows the post with the bolt remnant removed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgw8WmYxUHBE4guJCkqBnq6eLSH7SzeaOxUDxrKDrRouo6Kd96Hf4QpgvIT-B3GCazlz5pQaMaHXoOxLiLMyWbmo4Dc27KQd5xe5dE0Og5nDb_PjYsIhxamhoPmWlnaoEqajv71mN_z8SyXpJOwQFih3JC964KOv953-0gl34uhjUDaAA1QuS-lpHzixj8/s1200/45.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="899" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgw8WmYxUHBE4guJCkqBnq6eLSH7SzeaOxUDxrKDrRouo6Kd96Hf4QpgvIT-B3GCazlz5pQaMaHXoOxLiLMyWbmo4Dc27KQd5xe5dE0Og5nDb_PjYsIhxamhoPmWlnaoEqajv71mN_z8SyXpJOwQFih3JC964KOv953-0gl34uhjUDaAA1QuS-lpHzixj8/w640-h480/45.jpg" width="640" /></a></div><div style="text-align: justify;">Luckily it is possible to replace the drilled out bolt with a standard flat head M4-45mm bolt that can be secured in place with a washer and a nut:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8Om149VPhpQbg1PHszaFMiNZMGdTSzVYsg0tmjUMTsUn32x1aPnc4mkRI7WzjMmsbUeBaNoZmqbgiVtcFl0MjZxR7g3CZPBS6Nl5iIyc1reIjP_3WmYd3n6NRpEk04oiTq4S2HBLqoDwiyUdKMtMX5a7mGx_p5ksbOoS2cKGK7gh8jESUM0PEMvvf3Ag/s1200/46.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi8Om149VPhpQbg1PHszaFMiNZMGdTSzVYsg0tmjUMTsUn32x1aPnc4mkRI7WzjMmsbUeBaNoZmqbgiVtcFl0MjZxR7g3CZPBS6Nl5iIyc1reIjP_3WmYd3n6NRpEk04oiTq4S2HBLqoDwiyUdKMtMX5a7mGx_p5ksbOoS2cKGK7gh8jESUM0PEMvvf3Ag/w640-h480/46.jpg" width="640" /></a></div><div style="text-align: justify;">This shows the head of the bolt, how it perfectly fits into the hollow post from the bottom of the enclosure:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7zfr7PzObdudng84TItmwwhwIwQdblWe3GIp_2EZuhrFYO5QHzbDiRkR7tP0acDZoaUcz8ePXbDmhhAB8OTEqAlz0ISQerW0XyNXjHtgDA5NYjfZnaO8kC7na6zYZrYLwIyPTz716pjrIycvrfPPaLXdb4oOUIgARPiakoCkjYU0YN4JunTFho6RJBns/s1200/47.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7zfr7PzObdudng84TItmwwhwIwQdblWe3GIp_2EZuhrFYO5QHzbDiRkR7tP0acDZoaUcz8ePXbDmhhAB8OTEqAlz0ISQerW0XyNXjHtgDA5NYjfZnaO8kC7na6zYZrYLwIyPTz716pjrIycvrfPPaLXdb4oOUIgARPiakoCkjYU0YN4JunTFho6RJBns/w640-h480/47.jpg" width="640" /></a></div><div style="text-align: justify;">It is always a relief when one recovers from a broken bolt event. They can be pretty difficult to deal with.</div></div><div><div style="text-align: justify;">This shows the replacement bolt in action:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgG_PUY057zKiCKNERlLDSJZwAbLvefYH_2PcHqV-a1PmaGfsDlK548imBQZyuQ1OFhLZT-lxb_XhJYN3vNXFAFz_u7XK0ZkyEe8rSsP32sUVYqHoqDNswarxQtLSSnUjprBW7GtWTgDoPNpq93cl_CF43Pr5qOvjwlaEbqlHifZPyt8botfWOrn3nG3Pk/s1200/48.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgG_PUY057zKiCKNERlLDSJZwAbLvefYH_2PcHqV-a1PmaGfsDlK548imBQZyuQ1OFhLZT-lxb_XhJYN3vNXFAFz_u7XK0ZkyEe8rSsP32sUVYqHoqDNswarxQtLSSnUjprBW7GtWTgDoPNpq93cl_CF43Pr5qOvjwlaEbqlHifZPyt8botfWOrn3nG3Pk/w640-h480/48.jpg" width="640" /></a></div><div style="text-align: justify;">Like it never happened!</div></div><div><div style="text-align: justify;">Unfortunately, it happened at one of the two other bolts, too: I already had turned it a bit during my initial adjustment attempts, and that was enough to crack the aluminum bolt. So I replaced it with the same method:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYy5gmliY_AhJHOkRQHKFydnx7aV3FaZY333jKV4VBEG75HOa5VtLYWnskDb6d4cnIWL6bOQJs_hM-xzgQUIqCrWI0Dq_dtrnHSI3B_IIfuVWK9BuZ1irZNgEu2a9H5DArw1hwSHNQGTta2OcbOCNjoqbm7GXM7I4dMBmFf-Iy_BV_SXWFm0xlUSvYzTM/s1200/49.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYy5gmliY_AhJHOkRQHKFydnx7aV3FaZY333jKV4VBEG75HOa5VtLYWnskDb6d4cnIWL6bOQJs_hM-xzgQUIqCrWI0Dq_dtrnHSI3B_IIfuVWK9BuZ1irZNgEu2a9H5DArw1hwSHNQGTta2OcbOCNjoqbm7GXM7I4dMBmFf-Iy_BV_SXWFm0xlUSvYzTM/w640-h480/49.jpg" width="640" /></a></div><div style="text-align: justify;">I was able to save the third one by heating the bolt with the hot air blower of my soldering station, which softened the epoxy allowing me to remove the bolt and clean the threads while the epoxy was soft.</div></div><div style="text-align: justify;"><br /></div><div><div style="text-align: justify;">After all the platter and chassis adjustments were in place, it was time to do the tonearm adjustments. The most important is the tracking weight, which needs a calibration of the counter weight to balance the arm properly. This is done by turning the screw that is in the back of the weight. Since I usually need to ship turntables after the restoration, I need the calibration to be secured in place. Therefore, I replace the circlip that holds the screw in place with a M3 nut that allows tightening down the screw in the proper spot. This shows the original clip still in place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFCBgrPhUT0JMHvGnAasGK1ArkmZ7RIbugE7660Fv_vWpnIyDB44YXnBqnARcW3KtCDKS5I_SMBfEZCZEBdRTAC3GnOQiXEPPA0WK4Ku4PTDr4XWZqXcSLvj7QqyuFCfYOEZ1tSn27qVuyuQhaR7sonzUH9CsNxpu_ZN1PiuUxNrRfuoXETvu9e8074Xs/s1200/50.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFCBgrPhUT0JMHvGnAasGK1ArkmZ7RIbugE7660Fv_vWpnIyDB44YXnBqnARcW3KtCDKS5I_SMBfEZCZEBdRTAC3GnOQiXEPPA0WK4Ku4PTDr4XWZqXcSLvj7QqyuFCfYOEZ1tSn27qVuyuQhaR7sonzUH9CsNxpu_ZN1PiuUxNrRfuoXETvu9e8074Xs/w640-h480/50.jpg" width="640" /></a></div><div style="text-align: justify;">And here the nut installed:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOy0C1750DCGX0qwcQ2lKaFuW0pjLbdskRveTtfblisOQwDUpo8-EbblzCP62eiCreDJNpCuJUlz0tpppCNud_3b_K0k6KlabMClG_oavcNqn1ZKM8qNgYx3WqwfB7bq5BqrjMito97U1lKuiRTWOKpbnf6UEaNK0c5cMQqp2bT69CCraVibwmuOrg8vc/s1200/51.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiOy0C1750DCGX0qwcQ2lKaFuW0pjLbdskRveTtfblisOQwDUpo8-EbblzCP62eiCreDJNpCuJUlz0tpppCNud_3b_K0k6KlabMClG_oavcNqn1ZKM8qNgYx3WqwfB7bq5BqrjMito97U1lKuiRTWOKpbnf6UEaNK0c5cMQqp2bT69CCraVibwmuOrg8vc/w640-h480/51.jpg" width="640" /></a></div><div style="text-align: justify;">I usually try to calibrate the counter weight to get the proper weight at the 1.2g setting of the weight adjustment wheel:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7CBrRSireMtNNezIo7PRLpshJnbomRjKnX4dNYMlHQEUbGUnyvw-gtiZlPOVl6U4zWkuxVmlS1V_9bRJZCniH6QglYYyFH0tNSFKiso0_D8n5hzmhr_carMiTgyMCBzCuYiBemmQzHZt4xN1Vf-JM4Np5wBZXQcM3s0j1PGk2rxQk4tRairaq5eic6W4/s1200/52.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi7CBrRSireMtNNezIo7PRLpshJnbomRjKnX4dNYMlHQEUbGUnyvw-gtiZlPOVl6U4zWkuxVmlS1V_9bRJZCniH6QglYYyFH0tNSFKiso0_D8n5hzmhr_carMiTgyMCBzCuYiBemmQzHZt4xN1Vf-JM4Np5wBZXQcM3s0j1PGk2rxQk4tRairaq5eic6W4/w640-h480/52.jpg" width="640" /></a></div><div style="text-align: justify;">This wheel is notorious for being off across some of its adjustment range. It essentially torques a spring when it is turned adding or subtracting force to the arm. Generally, it is best to use a digital scale and simply turn the wheel until the proper weight is dialed in, regardless of what the scale on the wheel shows.</div></div><div style="text-align: justify;"><br /></div><div><div style="text-align: justify;">The next step was the adjustment of the arm lowering limit, which is an important failsafe to protect the needle from damage should the arm ever drop on an empty platter in the case of a circuit malfunction. The arm limit should be about 1 mm above the lower sections on the ribs (which are located at the three drop positions for LPs, 10" records and 7" singles):</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZ1eT5Kx6_S9gjxgJoyzCmnhERbivLobssiFQtu645Nt2w0vK8rctMYMuLMSkGrHUv7Q0AR15vFdwkgDK50Z8Rg_dqfyDR2X8ZRK1JqAZOj58rAYldclMi45UKUW-AIICcMmXvKkOPxx_a69GLge-saFV-eLerIv-ObnbcbQNueFWDPBp9VpA1FxQWO-E/s1200/53.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhZ1eT5Kx6_S9gjxgJoyzCmnhERbivLobssiFQtu645Nt2w0vK8rctMYMuLMSkGrHUv7Q0AR15vFdwkgDK50Z8Rg_dqfyDR2X8ZRK1JqAZOj58rAYldclMi45UKUW-AIICcMmXvKkOPxx_a69GLge-saFV-eLerIv-ObnbcbQNueFWDPBp9VpA1FxQWO-E/w640-h480/53.jpg" width="640" /></a></div><div style="text-align: justify;">The final adjustment was the tracking feedback to ensure that the carriage follows the needle properly as it advances towards the center of the record:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3v3bGTwv0INxgueMA9uylNTpNr677WK0dCR-Gc3fHn6WHieUoOrNhobSKrNocsbxYDTEhZAttVbmKjjibNI5VTJsF8_Caq2zvRB_1ZAVK3udqF9pnznap5HZZTWi7Em9b79AYiutVVI0GnJs2fHKQlPxE9dXoPfG2ExA99wrxX_cqasWSFnFuu7rh2fo/s1200/54.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh3v3bGTwv0INxgueMA9uylNTpNr677WK0dCR-Gc3fHn6WHieUoOrNhobSKrNocsbxYDTEhZAttVbmKjjibNI5VTJsF8_Caq2zvRB_1ZAVK3udqF9pnznap5HZZTWi7Em9b79AYiutVVI0GnJs2fHKQlPxE9dXoPfG2ExA99wrxX_cqasWSFnFuu7rh2fo/w640-h480/54.jpg" width="640" /></a></div><div style="text-align: justify;">On the way to a first test spin of this deck I needed to remedy the unbeolovely output cable mess, where a RCA adapter was essentially hotwire to the original DIN5 cable after cutting off the plug:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEibSM79_IXHItkpBfqcq9HkxcK0DeErQRqZG5LVYgwbnh1IeHLB9gSY5aGZloFDimH0WL14QF4zmEUimYP_UkOtTYseorjw3vw2dDHyrN0FojgD2yUxgaRBGWirirxZ6QJ3j2ajfxyS7Bi5koJy6ZnQLuPN4tKgaAoqYBnssVDmaajyOdY7FaC16vYnWTI/s1200/55.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEibSM79_IXHItkpBfqcq9HkxcK0DeErQRqZG5LVYgwbnh1IeHLB9gSY5aGZloFDimH0WL14QF4zmEUimYP_UkOtTYseorjw3vw2dDHyrN0FojgD2yUxgaRBGWirirxZ6QJ3j2ajfxyS7Bi5koJy6ZnQLuPN4tKgaAoqYBnssVDmaajyOdY7FaC16vYnWTI/w640-h480/55.jpg" width="640" /></a></div><div style="text-align: justify;">I removed the spliced in RCA cable and installed a new all-metal DIN5 plug with gold plated terminals, essentially restoring the factory setup:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJZVhE7O4BwXzYU-GBm0Mn6zHvLwvn1rQ6ZrFUAGBGI6AlE0GGObNLy-_94KhL1qrRYLHvZt9fDSkK-2QDwtbtsTbSSKTrl8gWLtCl_Fpe0sNo0KagrbXb4XkFk8yzvC0NKjAVP9JQPTEpSVbyXn0CrvvQIfDUr3C2jjBmTyHmaiVYw8bJWmzhKrV_rys/s1200/56.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJZVhE7O4BwXzYU-GBm0Mn6zHvLwvn1rQ6ZrFUAGBGI6AlE0GGObNLy-_94KhL1qrRYLHvZt9fDSkK-2QDwtbtsTbSSKTrl8gWLtCl_Fpe0sNo0KagrbXb4XkFk8yzvC0NKjAVP9JQPTEpSVbyXn0CrvvQIfDUr3C2jjBmTyHmaiVYw8bJWmzhKrV_rys/w640-h480/56.jpg" width="640" /></a></div><div style="text-align: justify;">Beogolden! </div></div><div style="text-align: justify;">My customer decided to let me install the <a href="https://beolover.blogspot.com/p/beogram-4002-remote-control.html" target="_blank">Beolover Commander remote control system</a>, which allows controlling all functions of the deck without touching the keypad. This is a great way to extend the lifespan of the fragile coating that is giving the keypad its distinctive looks. The Commander also adds autorepeat functionality and gives the deck an improved fast forward scan feature that automatically stops when the forward/backward buttons are let go.</div><div><div style="text-align: justify;">The installation of the Commander is an easy 'plug and play' process that does not require any soldering (check out the video that is posted under the above link). The first step is taking out the keypad for installation of the special breakout adapter that connects the Commander's power supply to the power rails of the Beogram:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXtN9VaZV4K20Q2wxntTPVK9ns424lbJqdIxz2iYA-nr8o7dU0_0s5smlxXpHY2R_3_mu6zmhbPNTlRzXg4LbA4eQzPvaIMGggWv5seoP7BU-IMxDSiVN8Ci9yOKc-gPb6neyU1wf5zYI9DuumzoijcKCOnczSSOjK5QmlJcYRmue4ZVVIC-PmXOinHi4/s1200/57.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXtN9VaZV4K20Q2wxntTPVK9ns424lbJqdIxz2iYA-nr8o7dU0_0s5smlxXpHY2R_3_mu6zmhbPNTlRzXg4LbA4eQzPvaIMGggWv5seoP7BU-IMxDSiVN8Ci9yOKc-gPb6neyU1wf5zYI9DuumzoijcKCOnczSSOjK5QmlJcYRmue4ZVVIC-PmXOinHi4/w640-h480/57.jpg" width="640" /></a></div><div style="text-align: justify;">The next step is the installation of the Commander board. It piggybacks on top of the main PCB using one of the threaded holes that the PCB bolts screw into. Here you can see the installed Commander and its connection via the white wire harness to the adapted below the keypad:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvhWleRwkFNYOmQUi7PjsQcLR3vzKSjeYTPgXGC8moc9eRuSDX7ViKIyG2uQHw79ggqt0yVIxeUV7SPDJ-Dv65dxvHv0VdNm4AGM7qDoTGhIU6HEhUjW9EmWi-dR66Zx5k94_kIL9P-RrH2pgw3eLsk4co4iV53edfRtCjUu6HCEylfMrNDaNaOxFpKOQ/s1200/58.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgvhWleRwkFNYOmQUi7PjsQcLR3vzKSjeYTPgXGC8moc9eRuSDX7ViKIyG2uQHw79ggqt0yVIxeUV7SPDJ-Dv65dxvHv0VdNm4AGM7qDoTGhIU6HEhUjW9EmWi-dR66Zx5k94_kIL9P-RrH2pgw3eLsk4co4iV53edfRtCjUu6HCEylfMrNDaNaOxFpKOQ/w640-h480/58.jpg" width="640" /></a></div><div style="text-align: justify;">Now the grey keypad plug can be plugged back into the breakout adapter:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjVXT5n5l_wVfxDTOAeVHvVYsCdtt22VH4LcxwdgxUmIjTMG_OAdd8hm_g8fUVlX9p9JJGyGqAAVp9GJRhrrCcPGJZ6FyArcTz3kLjn-TEi5ahylGbvqp_vkUoI4SBGyZO0UjPI5wWLsag7qYmp1gRTHdvA9QmzTnnrd4tJkTJLHTdwdrKXLVqjbqZ_6M/s1200/59.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhjVXT5n5l_wVfxDTOAeVHvVYsCdtt22VH4LcxwdgxUmIjTMG_OAdd8hm_g8fUVlX9p9JJGyGqAAVp9GJRhrrCcPGJZ6FyArcTz3kLjn-TEi5ahylGbvqp_vkUoI4SBGyZO0UjPI5wWLsag7qYmp1gRTHdvA9QmzTnnrd4tJkTJLHTdwdrKXLVqjbqZ_6M/w640-h480/59.jpg" width="640" /></a></div><div style="text-align: justify;">And the main black keypad plug goes into the socket on the Commander board:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3ZZN1yTKSC9dDKWsXihG5j2skcIfnB-KacZUtx9kYnPdZrEEjTVuwZZINy2qnPVt8wV1Vfr5URWaZrkj2cmATj-m24nsHP0XS6c4Myw6BPDrjHIztAeoxRAjAM_OX2ASLCAP1q2D5cFwfV0M-YkMsYQw64ibE8_r1r05m_Xz3rB3u3Q-g1ve5RWnEV3g/s1200/60.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3ZZN1yTKSC9dDKWsXihG5j2skcIfnB-KacZUtx9kYnPdZrEEjTVuwZZINy2qnPVt8wV1Vfr5URWaZrkj2cmATj-m24nsHP0XS6c4Myw6BPDrjHIztAeoxRAjAM_OX2ASLCAP1q2D5cFwfV0M-YkMsYQw64ibE8_r1r05m_Xz3rB3u3Q-g1ve5RWnEV3g/w640-h480/60.jpg" width="640" /></a></div><div style="text-align: justify;">The final installation step is bolting the autorepeat LED into the space beneath the RPM adjustment panel. It uses the same screw that holds the keypad assembly in place:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEje1bcQuNL9CZYK-Kwx1U-Gu7pwsgZKI12L1YdGIU4qsHN0Cww3eAg08kWInQmrRsz08XroiRxzHuRhbSlbSDL3z3zlsEtqR5aMNmnYe5gSFU4fgIRq9hGcDiKVvMy_Acq7vJO6AuzIIRU95sbCweS3ke0OBgwjsMMxuu1LQ0M01DuZbubc91AM9phUBjM/s1200/61.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEje1bcQuNL9CZYK-Kwx1U-Gu7pwsgZKI12L1YdGIU4qsHN0Cww3eAg08kWInQmrRsz08XroiRxzHuRhbSlbSDL3z3zlsEtqR5aMNmnYe5gSFU4fgIRq9hGcDiKVvMy_Acq7vJO6AuzIIRU95sbCweS3ke0OBgwjsMMxuu1LQ0M01DuZbubc91AM9phUBjM/w640-h480/61.jpg" width="640" /></a></div><div style="text-align: justify;">The IR remote receiver needs to be fed in between the plinth and the metal enclosure so it can poke out below the plinth when the Beogram is completely assembled:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhL9qUknDEsyeByQNPC785avHzeq05cJGzjHJYLTF7MXJ3iALmv8Q1mSerL_GpFC-gkI_Dm6hj1Ve-6mdGBMwV-Dw7TViYthyW93KvaiOoqi-LX_cD7oEyngnpdZadanXhyXp5i75Li0tJqCFew-lBTZYaEJXJ6jYOTSW_vop7wO8PZOPD2oM4fyUFc9u4/s1200/62.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="899" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhL9qUknDEsyeByQNPC785avHzeq05cJGzjHJYLTF7MXJ3iALmv8Q1mSerL_GpFC-gkI_Dm6hj1Ve-6mdGBMwV-Dw7TViYthyW93KvaiOoqi-LX_cD7oEyngnpdZadanXhyXp5i75Li0tJqCFew-lBTZYaEJXJ6jYOTSW_vop7wO8PZOPD2oM4fyUFc9u4/w640-h480/62.jpg" width="640" /></a></div><div style="text-align: justify;">Now the RPM panel can be replaced and that is about it:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiUhJgd6PotRf1ZhtSaN4BJEMyESm__HHSwN9um_5tna2BpHq38Eg_OJDbZux0YSDC71MTyIUg7n06vIyJk2AKr_BZKWs6xYG-YcU7I3e80bxiMrF1TZPfOo8lqCjuNt5zg2Q7aUYt5h9vvNg9VXN7R1-S9biLDIrZLimUTs2tal9MSc69ERPlNQNFHkF0/s1200/63.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiUhJgd6PotRf1ZhtSaN4BJEMyESm__HHSwN9um_5tna2BpHq38Eg_OJDbZux0YSDC71MTyIUg7n06vIyJk2AKr_BZKWs6xYG-YcU7I3e80bxiMrF1TZPfOo8lqCjuNt5zg2Q7aUYt5h9vvNg9VXN7R1-S9biLDIrZLimUTs2tal9MSc69ERPlNQNFHkF0/w640-h480/63.jpg" width="640" /></a></div><div style="text-align: justify;">Here a view of the completed installation:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEwC5hrj3yaIovbVuZGVcxge_iwkKLpZpA2wNpbuU00LeXEq95EXpNqP9I5lYHfHG4KdGVGSe8FR2T_9nVgyT4bWRCNtKEngkLIsLuphHoYaf6lXwzzrF3OiQry658EzchNXu0Miw0NexRrruo0dEkg69KU2gieHhQxGd7TcoW6x40Lr4Ro9XMWdUp5bU/s1200/64.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhEwC5hrj3yaIovbVuZGVcxge_iwkKLpZpA2wNpbuU00LeXEq95EXpNqP9I5lYHfHG4KdGVGSe8FR2T_9nVgyT4bWRCNtKEngkLIsLuphHoYaf6lXwzzrF3OiQry658EzchNXu0Miw0NexRrruo0dEkg69KU2gieHhQxGd7TcoW6x40Lr4Ro9XMWdUp5bU/w640-h480/64.jpg" width="640" /></a></div><div style="text-align: justify;">Now it was finally time to do the RPM stability measurement. I do it with all restored motors to check if everything is in good shape. This measurement is done with the BeoloverRPM device, which can log the RPM in 10s intervals for long periods of time. Ideal to catch those elusive random RPM variations:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQW3YO8AI_LiaxJJhfhOmlm7aGRPzqrm5O6uNrI8-Kv7QTWu6wSBaTLzxX0t4wAzOwZOZ5iDYGUjgfEV0XGdXgIX33dmNthA2A7tqVWkFGWX0MQx9hPFL7B16cimuxkssZ0JaQesfKSXkDbHs-gudffDzoBsGXMoKH__uMlRbANIPw3Ftg041mUXtvjP0/s1200/65.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQW3YO8AI_LiaxJJhfhOmlm7aGRPzqrm5O6uNrI8-Kv7QTWu6wSBaTLzxX0t4wAzOwZOZ5iDYGUjgfEV0XGdXgIX33dmNthA2A7tqVWkFGWX0MQx9hPFL7B16cimuxkssZ0JaQesfKSXkDbHs-gudffDzoBsGXMoKH__uMlRbANIPw3Ftg041mUXtvjP0/w640-h480/65.jpg" width="640" /></a></div><div style="text-align: justify;">This is the curve I measured after about 24 hrs:</div></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBOev74PY6sYE7HQaJAMbcNcAStNpsbUy11ycUS3tNUnlXwYkw_tVehXho86gz-3m1inc8nGcRs6wNOFD-eGAXwZSyq2GU1zLYCHChtD6DzbziQ0kiN77oIS042OxtjnRuP9mdvGaLA5-Z8TVBIkxIMw7aM7IqJApD8LGLpdzaVKZu7gcbaLaG07ZL6Ks/s1024/Beogram%204004%20RPM%20Stability%20Curve.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="593" data-original-width="1024" height="370" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiBOev74PY6sYE7HQaJAMbcNcAStNpsbUy11ycUS3tNUnlXwYkw_tVehXho86gz-3m1inc8nGcRs6wNOFD-eGAXwZSyq2GU1zLYCHChtD6DzbziQ0kiN77oIS042OxtjnRuP9mdvGaLA5-Z8TVBIkxIMw7aM7IqJApD8LGLpdzaVKZu7gcbaLaG07ZL6Ks/w640-h370/Beogram%204004%20RPM%20Stability%20Curve.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">This curve is pretty stable, but shows some slow drift. Probably a consequence of the top bearing being slightly differently oriented after re-assembly of the motor. These motors are pretty finicky when it comes to friction phenomena. After running for a few decades the bearings actually end up polished where the belt pulls the motor shaft towards the platter center. After the restoration process this position can be slightly off and some motors need a few dozen hours to settle with the new bearing alignment. The measured RPM drift is so slow that it could not be detected by the human ear. The important aspect of a satisfying motor restoration is the absence of sudden large RPM spikes like they typically occur with dry bearings.</div><div class="separator" style="clear: both; text-align: justify;"><br /></div><div class="separator" style="clear: both; text-align: justify;">Now it was finally time to give this beautiful Beogram a first test spin! I selected one of my favorite Bob James records, "<a href="https://www.discogs.com/master/43724-Bob-James-Touchdown" target="_blank">Touchdown</a>", which was produced in 1978. Of course this album was cleaned ultrasonically on a <a href="https://www.cleanervinyl.com/proxl.html" target="_blank">CleanerVinyl ProXL setup</a> before play! This shows the Beogram together with this lovely album:</div><div><div style="text-align: justify;"><br /></div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjj3avPEfy4xtkZ165SGTZZ8z-LLbzuw-TCGnjuoQ8S-kJIIFs3Pb6RLmru6-fnzC2DoSrcKXhBFTBtMpaz3UPCGZL-kvBBhUJfLBJhdZrrd_dd5snRz8ceAicXVr5NybB8PV1U1onDbELqtls2HeURIlOVDB7D-HU4I-LoKRgz7_tRtGAlGZTJZomMVbg/s1200/66.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1073" data-original-width="1200" height="572" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjj3avPEfy4xtkZ165SGTZZ8z-LLbzuw-TCGnjuoQ8S-kJIIFs3Pb6RLmru6-fnzC2DoSrcKXhBFTBtMpaz3UPCGZL-kvBBhUJfLBJhdZrrd_dd5snRz8ceAicXVr5NybB8PV1U1onDbELqtls2HeURIlOVDB7D-HU4I-LoKRgz7_tRtGAlGZTJZomMVbg/w640-h572/66.jpg" width="640" /></a></div><div style="text-align: justify;"><br /></div><div class="separator" style="clear: both; text-align: justify;">Beolovely! I will now play this Beogram for a couple weeks and if nothing else comes up, it will soon be time to send it back to its owner in California!</div><div style="text-align: justify;"><br /></div><p><br /></p></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-73091239735593693212023-10-03T16:47:00.003-04:002023-10-03T16:47:54.625-04:00Beogram 4002/4004: Restoration of Two DC Platter Motors<p style="text-align: justify;">I recently received two DC platter motors from a Beogram 4002 and a 4004 for restoration. As in most cases these two motors had dry bearings causing RPM variations.</p><p style="text-align: justify;">This shows the two motors as received:</p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9wBOtGrNMvIlBPOKitqvwczcAD0GI2Wr_Jxpn5T7bYPphxrNzWIuN8q0WunziYxMqsVJEW6ur3GKwAimJfZP39wW6HNXMXIrGen8-4BCmgmQYcKYAjmnf3UsvC3ZAIJstX7ai-qJy-DKL0uJ8KP_-2HIEKDsoaMWRHAnfeQw-tNX-PXU0ZIr8pRbXBYU/s1200/1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9wBOtGrNMvIlBPOKitqvwczcAD0GI2Wr_Jxpn5T7bYPphxrNzWIuN8q0WunziYxMqsVJEW6ur3GKwAimJfZP39wW6HNXMXIrGen8-4BCmgmQYcKYAjmnf3UsvC3ZAIJstX7ai-qJy-DKL0uJ8KP_-2HIEKDsoaMWRHAnfeQw-tNX-PXU0ZIr8pRbXBYU/w640-h480/1.jpg" width="640" /></a></div><div style="text-align: justify;">A look at the bottom plates of the sound proofing enclosures revealed the manufacturing dates:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgoxxWmHLqGaeZi-JaWcHat5Oc4-5DvfeUUb6KO3HXwip3YW_rbGJFUE33uc6x2MxzpwqXe9_B9LeRWb6nlZ4H779Omi5vAjrVRki_3P6lwJYommxhg5bqEDVUcgJ1YglFKnP1gB82p1mVQbzb-71w1_0jNW7p8ru9agxIK4pQB5VCzNtCiryzQ7HuD8j0/s1200/2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgoxxWmHLqGaeZi-JaWcHat5Oc4-5DvfeUUb6KO3HXwip3YW_rbGJFUE33uc6x2MxzpwqXe9_B9LeRWb6nlZ4H779Omi5vAjrVRki_3P6lwJYommxhg5bqEDVUcgJ1YglFKnP1gB82p1mVQbzb-71w1_0jNW7p8ru9agxIK4pQB5VCzNtCiryzQ7HuD8j0/w640-h480/2.jpg" width="640" /></a></div><div style="text-align: justify;">The 1976 motor is from a Beogram 4002, while the 1979 dated motor is from a 4004. They are almost identical in construction, except that the younger motor has a white plastic brush carrier in comparison to the brown FR-2 PCB material of the earlier design. This shows the 1976 motor taken apart to get the bearings out. They are on the small black pad upfront:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwwyLtbOduXQeL5bNW0jvM3wxECf8l3tpbvpc9MxvwZroVZjGM40TtQv81N6G0uJLabzQZXkw8ViF1oVX7GSe87ZONgQ7uY99Thx-fLe1jga5G987D-SV-iRUAIHcJx6iqJ6NCP9dfC_KAMXbR8-wBuU04E388ZhHHCibF5ck_MRhoaO434iOUWTeOZmQ/s1200/3.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwwyLtbOduXQeL5bNW0jvM3wxECf8l3tpbvpc9MxvwZroVZjGM40TtQv81N6G0uJLabzQZXkw8ViF1oVX7GSe87ZONgQ7uY99Thx-fLe1jga5G987D-SV-iRUAIHcJx6iqJ6NCP9dfC_KAMXbR8-wBuU04E388ZhHHCibF5ck_MRhoaO434iOUWTeOZmQ/w640-h480/3.jpg" width="640" /></a></div><div style="text-align: justify;">After immersing the bearings in motor oil and pulling a vacuum strong bubbling occurred as the air was drawn from the porous Oilite bearing material:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiT-zSdJUJu5i9auGseG6aIacfKGj2rCsBZbFRCZe4sty_z3eWe9s3KBH-U8R7A1VXA7-QcKtt0jnLFxQNptPGO-u7odUioBbKnofzRO3NoyAg3i1V4i0_dhjaYC7j4tI69uDTOACNOL4R2qODaENrzzCVogVa5Qqy2ZLoiT6L0p-IgLNzju0X2SGO8m0I/s1200/4.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiT-zSdJUJu5i9auGseG6aIacfKGj2rCsBZbFRCZe4sty_z3eWe9s3KBH-U8R7A1VXA7-QcKtt0jnLFxQNptPGO-u7odUioBbKnofzRO3NoyAg3i1V4i0_dhjaYC7j4tI69uDTOACNOL4R2qODaENrzzCVogVa5Qqy2ZLoiT6L0p-IgLNzju0X2SGO8m0I/w640-h480/4.jpg" width="640" /></a></div><div style="text-align: justify;">I did the same for the 1979 motor. After about three days the bubbling stopped for both of the bearing sets, indicating completion of the oil re-infusion process. I extracted the bearings from the oil</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiMFNs-AdGLKnXEUpJf0TG8XKU0-T3hKVTp7qBLzoPXXxT7KKpcSq0Z7rph59slRj8yskjfCxUNY-RJssHyM2o3KGv7yx3fceyd6U1bxW8NOwA2I7jkiJO5D66wEyFO9ug1MJ4mIek6ZbT4ExeJ_tNtG0e4rtF3VBJmv5V1RJl4ETSwxn0XT0-LKPdzwA8/s1200/5.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiMFNs-AdGLKnXEUpJf0TG8XKU0-T3hKVTp7qBLzoPXXxT7KKpcSq0Z7rph59slRj8yskjfCxUNY-RJssHyM2o3KGv7yx3fceyd6U1bxW8NOwA2I7jkiJO5D66wEyFO9ug1MJ4mIek6ZbT4ExeJ_tNtG0e4rtF3VBJmv5V1RJl4ETSwxn0XT0-LKPdzwA8/w640-h480/5.jpg" width="640" /></a></div><div style="text-align: justify;">and re-assembled the motors. Then I installed each of them in one of my Beogram 4002s and tested them with the BeoloverRPM device, which can log the RPM in 10s intervals for extended periods of time:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQhFbi6POGegsr0cJObTwMC-ZrTpFHlYYt1nspIkxDlwRkknpa76vUwASrB5EPtHJU5tE_CEtj6eBvjOvRqMivTDi3nGoXfUtISLDD724FUnqkuEv6YcnvZOFHUBu-J58o7necXNPny3deLwIQSEYhGZkwfbVUVbQr5TPFmMjLqscSwi7itljdA2ZNkrM/s1200/6.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQhFbi6POGegsr0cJObTwMC-ZrTpFHlYYt1nspIkxDlwRkknpa76vUwASrB5EPtHJU5tE_CEtj6eBvjOvRqMivTDi3nGoXfUtISLDD724FUnqkuEv6YcnvZOFHUBu-J58o7necXNPny3deLwIQSEYhGZkwfbVUVbQr5TPFmMjLqscSwi7itljdA2ZNkrM/w640-h480/6.jpg" width="640" /></a></div><div style="text-align: justify;">This graph shows the two RPM curves that I measured over about 24 hrs for each motors:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg_zbrqvrdFjoehKC-Q1QPt7MylzSa9E6202UwYV1aJ0VVkmgp1hSk6JUQe7SI698QUORMEP8uEaZXJfHui_07ie9lxUdxtOVQsLjUict0Q5PrSbcQEtpccdMYqQgtH-PhqrkNcnQ0CwZlQvh4DwFFTcDfWU6LSlW3_HmecWLptK4-CMDgyUMW3IHLCvSg/s1024/Beogram%204002%20RPM%20Stability%20Curves.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="593" data-original-width="1024" height="370" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg_zbrqvrdFjoehKC-Q1QPt7MylzSa9E6202UwYV1aJ0VVkmgp1hSk6JUQe7SI698QUORMEP8uEaZXJfHui_07ie9lxUdxtOVQsLjUict0Q5PrSbcQEtpccdMYqQgtH-PhqrkNcnQ0CwZlQvh4DwFFTcDfWU6LSlW3_HmecWLptK4-CMDgyUMW3IHLCvSg/w640-h370/Beogram%204002%20RPM%20Stability%20Curves.jpg" width="640" /></a></div><div style="text-align: justify;">The red curve corresponds to the 1979 4004 motor, while the blue curve (shifted for clarity) was measured for the 1976 4002 motor. Both curves are pretty similar and show the usual, probably temperature related, long term drift and some minor wiggles as the shafts polish the reoriented bearings. </div><div><div style="text-align: justify;">These motors are ready for business again!</div><p><br /></p></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-64782240214964702512023-09-19T23:20:00.004-04:002023-09-19T23:20:38.785-04:00Beogram 4004 (5526): When Disaster Strikes - Ripped Off Leaf Spring Adjustment Bolt <p>I made good progress with the restoration of the Beogram 4004 (Type 5526) that I <a href="https://beolover.blogspot.com/2023/09/beogram-4004-first-impressions.html" target="_blank">recently received from a customer in California</a>. Until I came to the part where I adjust the floating chassis and align the platter etc...what is usually a tedious, but fairly straight forward process quickly turned sour with this unit, giving me fodder for another post in my 'when disaster strikes' series!...;-):</p><p>What happened was that when I tried to adjust the height of the three leaf springs to get the floating chassis level, one of the adjustment bolts ripped off. I thought it was turning a bit difficult, but in this case it turned out that one of the previous owners had epoxied the nuts to the threaded sections of these bolts. Since I usually use a ratchet with a nut to turn these screws, I did not see that I was actually twisting the bolt and not just turning the nut!</p><p>This shows the assembly before the disaster struck (luckily I took a picture after straightening out the grossly bent alignment pins for the aluminum cover plates). The bolt in question is behind the pin to the right: </p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhiy8Q0u9ueoYU3NnRQaCjj70ijVKJHcQah507Tf43g8djmFNf26wFt_Gojptyy2WoTo_c26s8qi4cjfXoPKYK61kT-v9JeSFN-FflJnEDns1JeWsolzfi9YXD7LR-cpJ5HCvNoX9W97Xa8k6ntX9QHBhFMJG21EvUL9ald_nOKY57wV-Sk64pA6kWcwy0/s1200/1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhiy8Q0u9ueoYU3NnRQaCjj70ijVKJHcQah507Tf43g8djmFNf26wFt_Gojptyy2WoTo_c26s8qi4cjfXoPKYK61kT-v9JeSFN-FflJnEDns1JeWsolzfi9YXD7LR-cpJ5HCvNoX9W97Xa8k6ntX9QHBhFMJG21EvUL9ald_nOKY57wV-Sk64pA6kWcwy0/w640-h480/1.jpg" width="640" /></a></div>This is the section that came off:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhkLrO1wjzJIZmaJMpMdVGr-l68PdiRpiz-BE-EQY2z9jNmd6Vt8rup5YDQUJpi_RrRCGwmlqSdqspxRqH-b17DREcpyQwJ_P61WPecgNHqbNji_Ra4sFMfunHSFaS9MiPNt6quB7VmoruvO-R05OpjKo8eqmuiSJ8HBHWn7Kjol8O9PZ_qHEyxLmkgsbA/s1200/2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="899" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhkLrO1wjzJIZmaJMpMdVGr-l68PdiRpiz-BE-EQY2z9jNmd6Vt8rup5YDQUJpi_RrRCGwmlqSdqspxRqH-b17DREcpyQwJ_P61WPecgNHqbNji_Ra4sFMfunHSFaS9MiPNt6quB7VmoruvO-R05OpjKo8eqmuiSJ8HBHWn7Kjol8O9PZ_qHEyxLmkgsbA/w640-h480/2.jpg" width="640" /></a></div>After removing the leaf spring it looked like this. The bolt had separated at a level flush with the threaded hole in the enclosure bottom. Pretty Beounlovely!!:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiTrV1P87271oKceBbsidjvR_xfsXBZggVqUtQPiFTpmjou_ELLJUNQ6NwXHl1miGJJjj2oyHxDjgERATQvPF0k0Z0H9fM3iJCdh-3CCGMXTV698JPEG9elGWdLcLKoZsQe7B7KiofRqIlLweG56rXeOg2-lj6dBIzz93H2ab0LUHdyyXay2R2jrrWHQbg/s1200/3.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiTrV1P87271oKceBbsidjvR_xfsXBZggVqUtQPiFTpmjou_ELLJUNQ6NwXHl1miGJJjj2oyHxDjgERATQvPF0k0Z0H9fM3iJCdh-3CCGMXTV698JPEG9elGWdLcLKoZsQe7B7KiofRqIlLweG56rXeOg2-lj6dBIzz93H2ab0LUHdyyXay2R2jrrWHQbg/w640-h480/3.jpg" width="640" /></a></div>At least, after heating the bolt with my solder station blower I was able to get the nut separated from the bolt fragment:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhObu3MFUjgNee9PPNwANB_7NF-4IMayN-sCtdBt6JqRnWt5coVxDhOkZg1PF16kl_M-c3y6ytnAMZ7L2b3feAQTFBa-wAFL44qc_0CL4hHprPHE9np6qHpZHLG_xvlwpgHlcOm27Q69ITCpa8bnn_YjSW3do1AxtjrdOhX-fZmuIDwYMw6p6ypxiQNn2Q/s1200/4.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhObu3MFUjgNee9PPNwANB_7NF-4IMayN-sCtdBt6JqRnWt5coVxDhOkZg1PF16kl_M-c3y6ytnAMZ7L2b3feAQTFBa-wAFL44qc_0CL4hHprPHE9np6qHpZHLG_xvlwpgHlcOm27Q69ITCpa8bnn_YjSW3do1AxtjrdOhX-fZmuIDwYMw6p6ypxiQNn2Q/w640-h480/4.jpg" width="640" /></a></div>The next step was dealing with the broken off bolt fragment that sat flush in its threads. Such twisted off bolts are dreaded by anyone how deals with mechanical things! It is usually a bit of a mess to deal with such bolts. Since I only have a mini drill press for delicate tasks, I opted for drilling the M4 bolt out in three steps. First I made a mark with a center punch as centered as possible on the bolt surface. Then I used a 2 mm drill to hollow out the bolt. I used some oil to prevent the drill from getting stuck:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEix9lN8FO2qGJpKOUSqCdP4MOPfeiJY6AsfWrEahISRxRe_f5hvAADXQjdegXagkdq9f4G71lJ5rrw_scj3qxaYMYZZKAAsPiOkA1QVObGgIxvmgHTkg9uAvWTgMAdrDxn8_1_5FDQa1bGnl3V108ETQb-VGxAdiiIuQs0EJCdOd9FYuW3QBKhRscJyk2Y/s1200/5.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEix9lN8FO2qGJpKOUSqCdP4MOPfeiJY6AsfWrEahISRxRe_f5hvAADXQjdegXagkdq9f4G71lJ5rrw_scj3qxaYMYZZKAAsPiOkA1QVObGgIxvmgHTkg9uAvWTgMAdrDxn8_1_5FDQa1bGnl3V108ETQb-VGxAdiiIuQs0EJCdOd9FYuW3QBKhRscJyk2Y/w640-h480/5.jpg" width="640" /></a></div>The next step was re-drilling the hole with a 3 mm drill:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivXtQFP6qkyHTnrnlONyzatbBbB1NSTeLWs2dGzsLAC9puOfMXhYZ7tFd9-XQO2R5WBa-ygdhjfCwnJno_Bu-Pv_mp8fxqWZAgpf-Jz-R4S7KYobMSPNhMxMpaxqJOC_FZTrtDdV2x6ELTxIni6sOM4H2sLrINwKDzN26-xXn64bICuKnfARMbDGrZGq0/s1200/6.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivXtQFP6qkyHTnrnlONyzatbBbB1NSTeLWs2dGzsLAC9puOfMXhYZ7tFd9-XQO2R5WBa-ygdhjfCwnJno_Bu-Pv_mp8fxqWZAgpf-Jz-R4S7KYobMSPNhMxMpaxqJOC_FZTrtDdV2x6ELTxIni6sOM4H2sLrINwKDzN26-xXn64bICuKnfARMbDGrZGq0/w640-h480/6.jpg" width="640" /></a></div>And then I finally went in with a 4mm bit. This cleaned out all the remnants of the bolt:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiL4EL5EbYpW9zgj8h6HP17KssvtHR08VtjfzBckbo37Zwx-cKKscomdqSOylr9sl4zuov-1WMazmNU_SgeWT-PDP97Ctvo9bmUUfFEQi-11NFXmlKHwXC_raLabCQPzCiEYtqoBpx77Y3OgCSsI3iGEsxCwYnpvP25aIuvkLMPtsFyiYuSCPSVws8_TaY/s1200/7.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="899" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiL4EL5EbYpW9zgj8h6HP17KssvtHR08VtjfzBckbo37Zwx-cKKscomdqSOylr9sl4zuov-1WMazmNU_SgeWT-PDP97Ctvo9bmUUfFEQi-11NFXmlKHwXC_raLabCQPzCiEYtqoBpx77Y3OgCSsI3iGEsxCwYnpvP25aIuvkLMPtsFyiYuSCPSVws8_TaY/w640-h480/7.jpg" width="640" /></a></div>Then I Installed a M4-45mm stainless steel flat head bolt with a nut and a washer:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjiXeQUW3rGwZ1zjIWPi39cDcrYTggmLjEcMaBkXa3JxQggMg-JHcJQpcqij2VcpI0sK00q52aq6xQq56iDBFj0JrzUYC10wwVzFowtuna0D2ERTayRn6MK6G2nf7CIbE7ug5rTokC1SK_OBLYdL_Gk7-xI_Q6cOv2LiyFn7BebWrw1cQFIXBwqw9Jkgzk/s1200/8.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjiXeQUW3rGwZ1zjIWPi39cDcrYTggmLjEcMaBkXa3JxQggMg-JHcJQpcqij2VcpI0sK00q52aq6xQq56iDBFj0JrzUYC10wwVzFowtuna0D2ERTayRn6MK6G2nf7CIbE7ug5rTokC1SK_OBLYdL_Gk7-xI_Q6cOv2LiyFn7BebWrw1cQFIXBwqw9Jkgzk/w640-h480/8.jpg" width="640" /></a></div>This was possible since the mounting posts for these adjustment bolts are hollowed out and accessible from the bottom of the enclosure. The flat head of the bolt fit perfectly and flush into the hollow:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiECAaaqscqwutIgjD5z7RKOiG9hZFS_EGBDFc3PQoUd3YZNcDDEiYQx9oG9qPSpleAsCm2kthFkcEwnCtW1Mnd15Q681sqFPVppdlke7MzLeCMbTPBQrCk_XlsujOyIOmkLjgvdlHxe1G47argU0D4EB-yOXu0DOSdpXptUf90Fteu7UiXWSoSwbydSNA/s1200/9.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiECAaaqscqwutIgjD5z7RKOiG9hZFS_EGBDFc3PQoUd3YZNcDDEiYQx9oG9qPSpleAsCm2kthFkcEwnCtW1Mnd15Q681sqFPVppdlke7MzLeCMbTPBQrCk_XlsujOyIOmkLjgvdlHxe1G47argU0D4EB-yOXu0DOSdpXptUf90Fteu7UiXWSoSwbydSNA/w640-h480/9.jpg" width="640" /></a></div>And this is how it looked with the spring installed again:<br /><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXhW3E_mFnsn-0ztt-c2uc_iau5LNuiIJi68G0YCe8uRJDyqnX6GOvpiWzmc0iIgVv1hzXtgPBqRQ7_svkv0JraF_FJqnT3R1NaAkS-s4NjqoCpjAsoPrCfWQYqvC7AJM7n28a0OeufNRMX2N1q9b3fb5k3VduJFe_CxMv-Ly9uAbcAYNpMIKZdlQucoI/s1200/10.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiXhW3E_mFnsn-0ztt-c2uc_iau5LNuiIJi68G0YCe8uRJDyqnX6GOvpiWzmc0iIgVv1hzXtgPBqRQ7_svkv0JraF_FJqnT3R1NaAkS-s4NjqoCpjAsoPrCfWQYqvC7AJM7n28a0OeufNRMX2N1q9b3fb5k3VduJFe_CxMv-Ly9uAbcAYNpMIKZdlQucoI/w640-h480/10.jpg" width="640" /></a></div>Looks like it never happened! Beolovely!beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0tag:blogger.com,1999:blog-3593368886863596505.post-51271450309854019342023-09-19T13:20:00.002-04:002023-09-19T13:20:43.028-04:00Beogram 4002: Installation of a Brand New Hood and Aluminum Trim<p style="text-align: justify;">I recently received the hood hinge from a Beogram 4002 located in Florida for installation of a new hood. This shows it as I received it:</p><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjCHJ_pz5XiByQ1FHrBFKd9eJmel2RusrDVhTMf9HP49L9A89wmKfWXYJbFis5gmJ_Q0aAdblyUdnnUmK2uIiTGvSf82o_0nXgdoTJFiZc2SKR0q4f5N0WH0VHsYWzucOSdQFXLwFCVRCUkK_NhmIuCShNbhczNuF0kQOlDbuEGxK2nZJ2grDux3wwdJLE/s1200/1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="353" data-original-width="1200" height="188" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjCHJ_pz5XiByQ1FHrBFKd9eJmel2RusrDVhTMf9HP49L9A89wmKfWXYJbFis5gmJ_Q0aAdblyUdnnUmK2uIiTGvSf82o_0nXgdoTJFiZc2SKR0q4f5N0WH0VHsYWzucOSdQFXLwFCVRCUkK_NhmIuCShNbhczNuF0kQOlDbuEGxK2nZJ2grDux3wwdJLE/w640-h188/1.jpg" width="640" /></a></div><div style="text-align: justify;">Closer inspection revealed what had happened:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDE5BA3Gq93NxvkypbibYofCSL8S3oWECx9V_0yNgles7Nt8IICTbxPSlQARF_2KeRNVJ68GiaWq788nJ4Ach-WHO87ylUUPOVA8i-3-TJPkktIjYFBKIkx2RRZTUjP9VbePdYunU7stubO1cd5u_oLcFuul6WgV_zeD12d14rc7jFcBaoPKekixhYJDA/s1200/2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhDE5BA3Gq93NxvkypbibYofCSL8S3oWECx9V_0yNgles7Nt8IICTbxPSlQARF_2KeRNVJ68GiaWq788nJ4Ach-WHO87ylUUPOVA8i-3-TJPkktIjYFBKIkx2RRZTUjP9VbePdYunU7stubO1cd5u_oLcFuul6WgV_zeD12d14rc7jFcBaoPKekixhYJDA/w640-h480/2.jpg" width="640" /></a></div><div style="text-align: justify;">The hood developed a fracture around the mouting holes, which is unfortunately very common due to the design choices that B&O made back then. The use of flat head bolts created lateral stress in the plexiglass material. Over time cracks develop and eventually the hood breaks off.</div><div style="text-align: justify;">Luckily, there are brand new hood available that are faithful reproductions of the original design, but with a better bolt design, which promises to last longer. These hoods are available for DIY from the Beoparts store in Denmark.</div><div><div style="text-align: justify;">This shows the new hood together with a new reproduction 4002 aluminum trim. In the picture the trim is in process of being centered on the hood with the help of two brackets that I designed for this alignment process:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjiJQIF8_fAuCMf62ecQHfH4vkP3KhQ2fokbF9Xh_TXLUCyPndxCTpNb9JFx6nZpI7d4uQ6YXqdA5fu89NwO1kF3Q1GxWgZ2wxS_A9uueo63XFRT17Ms32lXLkxxTIc0uaB7rSZOFzl8S6YGXHvjdueY7QKoPRk9Oe83gfchifZm8byvWa65wx9fnegaQo/s1200/3.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="553" data-original-width="1200" height="294" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjiJQIF8_fAuCMf62ecQHfH4vkP3KhQ2fokbF9Xh_TXLUCyPndxCTpNb9JFx6nZpI7d4uQ6YXqdA5fu89NwO1kF3Q1GxWgZ2wxS_A9uueo63XFRT17Ms32lXLkxxTIc0uaB7rSZOFzl8S6YGXHvjdueY7QKoPRk9Oe83gfchifZm8byvWa65wx9fnegaQo/w640-h294/3.jpg" width="640" /></a></div><div style="text-align: justify;">Once the alignment mark is made on the blue tape it is time to bolt the new hood to the hinge. For this it is best to remove the sliding pads that are under the springs. This gives the hinges more room to move laterally, which makes it much easier to put the bolts in:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEisG6pYIlxr-ksWaWA0gmKFVdS1-hjz05k-GEGnnDA46oLNkvoUbAQef0qCs_HoIGdrJc4ssbkX6NA6WLPkshmTFSuSKn1p6AoymeOAyoUMIpZeSnw710F-rp40PGeYLp778-PvxVWWhRMdTzfDYP1_fzIFWkk5xLa4JCYTqgP8xb4C8WqrmWjhSb7PGVc/s1200/4.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEisG6pYIlxr-ksWaWA0gmKFVdS1-hjz05k-GEGnnDA46oLNkvoUbAQef0qCs_HoIGdrJc4ssbkX6NA6WLPkshmTFSuSKn1p6AoymeOAyoUMIpZeSnw710F-rp40PGeYLp778-PvxVWWhRMdTzfDYP1_fzIFWkk5xLa4JCYTqgP8xb4C8WqrmWjhSb7PGVc/w640-h480/4.jpg" width="640" /></a></div><div style="text-align: justify;">Once the bolts are in, the pads can be replaced:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEia9fXnil78Dcy7ZKEs0JIlCddjfZcNyO7EIx4THPwAHzbwkbLpvbYBL80G4oPJeSeUiUX3O3Ip0y7ouN94qslt1FTVts8Qz1Pnwrr1c1oOkjjKNKQH1gqDlhzm24FONeV59zo4JWd84U0W2rbMCKPBGIT-twI8aVvnrL8ZPqcwGHhtRHqEXtsbXy-ODBo/s1200/5.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="900" data-original-width="1200" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEia9fXnil78Dcy7ZKEs0JIlCddjfZcNyO7EIx4THPwAHzbwkbLpvbYBL80G4oPJeSeUiUX3O3Ip0y7ouN94qslt1FTVts8Qz1Pnwrr1c1oOkjjKNKQH1gqDlhzm24FONeV59zo4JWd84U0W2rbMCKPBGIT-twI8aVvnrL8ZPqcwGHhtRHqEXtsbXy-ODBo/w640-h480/5.jpg" width="640" /></a></div><div style="text-align: justify;">The final step is to glue the aluminum strip to the hood, and then we have a brand new hood for an almost 50 years old Beogram 4002!:</div><div class="separator" style="clear: both; text-align: justify;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh93TUHv7_N1Lv0r0VnrrXTiGKN68msyJDEP0wvqjOA_0_6-reiYrEViIcakYgc1fcZSOryy_wN55jSc5nRaMTZoxOoMKpSgQXQoKyblchCvYC-eY8Jas9gOMLb5gWcGhCiHldzrL8p4e5q8t1Ly-89f6ewI99PpeUdg18Op5wbj7WTesBw8JkPqPdEZ1E/s1200/6.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="730" data-original-width="1200" height="390" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh93TUHv7_N1Lv0r0VnrrXTiGKN68msyJDEP0wvqjOA_0_6-reiYrEViIcakYgc1fcZSOryy_wN55jSc5nRaMTZoxOoMKpSgQXQoKyblchCvYC-eY8Jas9gOMLb5gWcGhCiHldzrL8p4e5q8t1Ly-89f6ewI99PpeUdg18Op5wbj7WTesBw8JkPqPdEZ1E/w640-h390/6.jpg" width="640" /></a></div><div class="separator" style="clear: both; text-align: justify;">This hood will soon be shipped back together with a <a href="https://beolover.blogspot.com/p/beogram-internal-riaa-pre-amplifier.html" target="_blank">Beolover internal RIAA pre-amp</a> and a <a href="https://beolover.blogspot.com/p/beogram-4002-remote-control.html" target="_blank">Beolover Commander remote control</a> system. A very nice upgrade! Beolovely! </div><div style="text-align: justify;"><br /></div><p><br /></p></div>beoloverhttp://www.blogger.com/profile/18427149493268653743noreply@blogger.com0