Beogram 4004 Type 5526 - California Project - Completed, Tested and Ready to Ship

This post continues from the last post where the initial power on and start play operations were tested on this Beogram 4004.

Even though most of the functions I tried appeared to work I still needed to finalize moving the new trimmer for the platter sensor circuit to its final position.

Here is the DC voltage check of that platter sensor circuit as measured at the collector of 1TR3.
The new trimmer is adjusted to get 4 VDC at the collector with no platter in place.

That was easy to dial in but when I examined the platter sensor signal with an oscilloscope I could see quite a bit of noise on the signal.  The signal was the expected shape but the noise wasn't expected.

I checked the 21 VDC rail voltage for the circuit and could see noise there as well.

The voltage was good but the noise wasn't.

To remove the unwanted noise on the 21 VDC rail voltage I changed the filtering capacitor I had added to a 10uF value, then remeasured the rail voltage and platter sensor signal.

Much better now.

Even though the sensor circuit appeared to be working correctly, I have seen where noise like I was getting cause strange things with the Beogram control circuit.  

I installed the new Beogram platter speed indicator lamps next.
These are the Beolover LED replacement lamps from the DKaudiolover.com store.

Here are photos of the cleaning and Deoxit treated Beogram control panel contacts.
This Beogram 4004 will be getting the Beolover Remote Commander installed but I want to make sure the manual control button operation is perfect.

This picture shows a couple of contacts cleaned and treated on the left while the other contacts have yet to be cleaned.

...and this picture shows the full set cleaned and treated.

I used the Beolover RPM measurement tool to calibrate the 33.33 and 45 RPM platter speeds of the Beogram 4004.  This Beogram 4004 has a Beolover restored DC platter motor so it must be calibrated to the correct speeds.

Next is the installation of the Beolover Remote Commander (one of my favorite additions to any Beogram 4002 and 4004 turntable).

The installation of the Remote Commander to a Beogram 4004 is slightly different from a Beogram 4002 as the Beogram 4004 has a basic, no-frills remote control circuit that must be tied in to.

A drawback of the built in Beogram 4004 remote control circuit is that it is only functional when the Beogram 4004 is paired with a Beomaster 2400 receiver.  And...the remote control of the Beogram is just play, pause and stop.  The Remote Commander provides all of the Beogram 4004 control panel functions.

Now the Beogram 4004 is ready to be reassembled and some records played on it.

The final step of this restoration project was to replace the original dust cover with a brand new one from DKSoundParts along with a new aluminum trim piece.

The first step is to center the new trim piece and mount the trim onto the top portion of the new dust cover.  The two ends that bend down over the left and right sides are left straight at this point so the dust cover can be mounted onto the metal hinge assembly.

Here is one side of the metal hinge assembly and dust cover attachment screws.

After the dust cover is attached to the metal hinge assembly, the left and right sides of the new aluminum trim can be bent into place.

Note:  This attachment of the trim can be a little tricky. I found that I had to clamp the top and sides in place to make sure the double-sided tape bonded the trim securely (without pulling away).

The new dust cover assembly is now ready for installation on the Beogram 4004 frame.

There are two of these spring loaded mounting clamps that screw down on the dust cover assembly.

I am leaving the protective plastic wrap on the dust cover and Remote Commander remote so the owner of this Beogram can be the first to open them up.

I will listen to a few more records on this Beogram before shipping it back to its owner.

After that, I have another Beogram 4004 to begin restoration on.