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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 25, 2020

Beogram 4002 Type 5513: Inside Work

The restoration of the Beogram 4002 from Houston continues as I worked on the inside of the turntable. In this post I worked on the tangential arm assembly components and the Beogram reservoir capacitor replacement.

Here is an updated photo of this Beogram 4002 with its chassis and tangential arm assembly removed.
























The tangential arm assembly components on this Beogram 4002 are in excellent shape.  Most of my tasks were just cleaning and lubrication the Beogram chassis parts. In the photo above you can see the arm lowering damper removed and disassembled. The parts were nice and clean but the lubrication fluid for the damper was gone. I applied a fresh coat of PMX-200 silicone fluid per the service manual. The tangential drive spindle was also cleaned and lubricated along with the nylon nut (that drives the arm assembly). The tangential arm assembly tracking components were checked and all looked to be in great shape.



























Two components I did change out were the tangential arm assembly position sensor lamp and the tangential drive pulley.

I replaced the old plastic pulley with a new aluminum one.



Just for reference here is a photo of the underneath side of the Beogram 4002 tangential arm assembly carriage. It isn't seen very often in restoration photos but is a good thing to examine.
The thin wires from the phono cartridge come out of the base of the tonearm pivot and connect to a transfer board. From there they are picked up by a larger, shielded cable that takes the audio signals over to the audio muting circuit just prior to exiting the Beogram (to a preamplifier).



























....and finally here is a photo of the new Beogram 4002 reservoir capacitors. As usual I installed the nice Beolover replacement capacitor assembly.



























There were no surprises with this Beogram 4002 turntable and these components are now ready to be reassembled back in the Beogram cabinet.

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