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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, February 29, 2020

Beogram 4002 Type 5513: Initial Assessment

A local Beogram 4002 owner dropped off a turntable for assessment of restoring it.
This is a long time owner of this turntable and I can tell before opening it up that it has been well taken care of.
























There is the typical wear on the control panel buttons that comes from a well used Beogram 4002.
The dust cover has minor marks but overall is shiny and can be cleaned up with a light polish.

There is some issue with the tonearm. It functions but is out of adjustment.
You can see that the tonearm is hanging a little low when the Beogram is parked.





















Opening the Beogram up I can see that it is very clean inside. Signs that this turntable always enjoyed a very comfortable environment.






















Surprisingly the original washers for the floating suspension lock down are intact. The are looking a little dry but haven't cracked and crumbled like most. I can apply some plastic restoration cream on them and they should be okay.






















Looking at the tonearm issue a little closer I can see that everything is intact. It may just need the service manual adjustments.
























I plugged the Beogram in and ran a few operational tests.
The buttons all work and the turntable appears to function.
With the tonearm needing adjustment I won't attempt to play a record.
The Beogram runs very smoothly although I spotted the LED light source for the carriage position sensor is out.  The tangential tracking lamp does function and so does the record sensor in the fixed arm.






















I will check out all of the sensor signals in more detail later.

Here are more photos of the inside of this Beogram 4002 Type 5513.




























Very clean and in excellent shape.
The tangential drive screw pulley is in really great shape. Those usually have a small crack somewhere in the plastic where it attaches to the shaft. I will look at that closer with a magnifier later but it operates very smooth.
The platter motor works nice but we know from all of our other Beogram 4002/4004 restorations that at forty plus years old the two bearings in the DC motor have to be low on oil.
I will pull this platter motor and send it to Beolover for a rework. After that the motor will be good for another forty to fifty years.

So from this initial assessment I see that the platter motor should be restored by Beolover.
The Beogram mechanical service manual checks need to be performed.
The voltages on all of the sensors needs to be checked and the Beogram needs a new carriage position sensor LED.
We typically recommend recapping the electrolytic capacitors and replacing the trimmers for the platter speed.
Changing the two speed indication lamps on the display panel is also recommended for maximum stability of the platter motor (those lamps are actually part of the analog control circuit).
Cosmetically the dust cover could use polishing and the control panel could use restoring.

There could still be some hidden problems I don't know about but from what I see this Beogram 4002 is in as good a condition anyone would want to begin a restoration.

This Beogram is also a good example of why a forty year old turntable should be given a thorough check and adjustment. It is in beautiful condition and for the most part functions nicely. But with a proper servicing this turntable can be functioning perfectly and at its full capability again.

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