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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...

Friday, April 11, 2025

Beogram 4002 (5513): A New Arrival from California - A First Assessment

I recently received a Beogram 4002 (Type 5513, with DC platter motor) for evaluation. My customer wanted to know whether the unit could be brought up to a functional state on a budget, or whether he should sell it to the Beolover instead.

This shows the unit as extracted from the packaging:

It has pretty decent aluminum surfaces. The hood has the usual scratching but no obvious cracking around the hinges, so could be potentially polished and returned to a decent state. The wood plinth probably should be replaced with a new CNC machined frame if a pristine look is desired. The left corner could be re-glued
but the right corner is chafed at the bottom:
The keypad has the usual use traces:
This could be fixed with a new reproduction keypad plate.
I removed the hood
and the aluminum plates and platter:
Below deck this unit seems largely original. A visual inspection revealed missing hood bolt springs:
Also the transport lock bushings are degraded as usual as is evident from the many orange plastic fragments found throughout the enclosure:
Likewise the plastic plinth guidance washers are gone:
Another plastic part failed, too: The carriage position sensor housing has lost one of its legs. It is still hanging on due to it being also glued down with double sided tape:
This should probably be addressed by installing a Beolover Carriage Position PCB for Beogram 4002 and 4004. This recently made available board represents a modern redesign of the carriage position detection circuit using a monolithic IR photo-interrupter whose signal is cleaned up and shaped by an opamp in combination with a Schmitt trigger. This alleviates the sometimes tricky implementation/adjustment of new sensors and/or LEDs on the original board.
Then it was time to plug this unit in and press start for the first time. I could not help noticing the mouse bites on the power cable:
It always amazes me that rodents would prefer nibbling on plastic insulation instead of venturing out and finding a nut or something else that is nutritious and tasty! They must have a different worldview!...;-).
I pressed START and the carriage started sluggishly moving towards the LP setdown point, which was found and the solenoid engaged. All good signs. After disassembling, cleaning and re-lubricating the carriage mechanisms should work o.k. again.
The platter motor ran pretty noisily, also nothing out of the ordinary. These motors usually need a restoration before a reliably constant RPM can be achieved again.
In summary, I would think this unit could be a decent candidate for a full restoration resulting in a like-new Beogram fit for reliable day-to-day operation.



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