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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...

Saturday, November 28, 2015

Beogram 4000: Adjusting the Chassis Springs and the Platter Height

The Beogram 4000 that I am rebuilding right now is entering the 'beautification phase'. It works now very well, and what is left are the exterior and a new good plated plug etc...So I set out to adjust the platter height and tilt and the leaf springs that hold the floating chassis of the turntable. This task is a relatively complex one since one has to "try[] to hit a bullet with a smaller bullet whilst wearing a blindfold, riding a horse" (to say it with Scotty in the 2009 Star Trek reboot...;-). Since sensor arm orientation relative to the floating chassis, platter tilt angle relative to the chassis, linear travel in the opened transport lock and belt tension all play significant roles in the adjustment process, one needs some patience and may have to redo things a few times until one hits the sweet spot where the platter is centered and leveled with the aluminum panels and parallel to the arms, and the chassis does not touch the locks when they are open.

I recently made a couple of videos that show the basic approach. They are posted here. Here are a few pictures of the fully adjusted platter relative to the aluminum panels:

And an 'in-action' detail. She is getting real pretty now!..;-): 

The aluminum panels were quite dirty on this unit. Here is an area in comparison before and after cleaning with Mr. Clean Magic Eraser pads and some (hand-) dishwashing detergent:

And after:

What would we do without Mr. Clean??!!

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