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Beolover SyncDrive: DC Platter Motor Replacement for Beogram 4002 and 4004 (Type 551x and 552x)

Late Beogram 4002 and the 4004 (Types 551x and 552x), which have DC platter motors instead of the earlier synchronous AC motors usually suff...

Thursday, June 1, 2017

Beogram 8000: Completing the Capacitor Replacement and Checking the Work

Today I finished up the capacitor replacement by changing out the motor capacitor in the transformer box and the 5VDC power regulator capacitors on the chassis.

Here is the motor coil coupling capacitor located in the transformer box and its Beolover 3D printed part replacement.






























Very nice and tidy (and secured).
Next were the capacitors for the chassis mounted 5V regulator.



























Now for a quick test to see where this restoration is at. The first thing to check is the +5V power to the microcomputer. I measured the voltage across the new C28 capacitor in the microcomputer board. This is why I haven't close up that board assembly yet.






















Processor supply power looks good and the Beogram 8000 red standby dot illuminated in the speed display window.

Now to check the platter speeds. When this turntable first arrived I did a quick check to see if there was anything noticeably wrong. I remember that the 45 RPM appeared to work but the Beogram was having problems locking in the 33.33 RPM speed.  After the capacitor rework I wanted to check the speeds again.

Both speeds lock right in when selected now.























Those were good test results after the capacitor replacements.  There are still quite a few tasks remaining though. I need to run through the mechanical adjustments and there are several electrical adjustments/checks to do.

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