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This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Dear beolovers
Here is my current problem: a few weeks ago, I re-oiled the bushes of the platter motor of my 4002, and it seemed to have fixed the unstable speed problem I had. But today, in the middle of a 33T, the speed decreased and the platter stopped. I pressed the « stop » button, the arm returned to its resting position, I restarted the turntable and it could read three more LPs without any problem. I must say I made a mistake when plugging the motor after re-oiling : I plugged it into P2 instead of P1 for a few seconds, and the motor ran at high speed. But then I plugged it correctly, and all went well, I could play many LPs until today’s problem. So I assume my plugging mistake is not the cause of this unexpected stop (but I read an old post of Dillen saying such mistake would damage the motor and the PCB?). I experimented this stopping problem with this tunrntable only once before, many years ago. I have two questions:
- is it possible my plugging mistake damaged the PCB or the motor while they worked well since that, except for today’s problem?
- what do you suggest to solve the problem ?
Thank you all and sorry for my poor english (I’m french..)
Best regards,
P. Buisson (Lyon, France)
Hi,
Your Beogram is quite rugged so I suspect it is probably okay. However, you cannot lubricate the platter motor using the method you attempted. In fact I have seen several Beogram 4002 turntables that were over oiled. Oil was everywhere inside...but that is a different story.
With the platter motor the motor bearings have to be re-infused with oil. This post shows the details of re-infusing the bearings with oil.
-sonavor
Thank you very much, Sonavor. I know the re-infusing procedure for the bearings but, since I did not want to unsolder the terminals at the bottom of the motor, nor fold and unfold the thin washer which holds the top bearing, I only open the motor to get access to the bearings, put a drop of SAE 30 on each one and let it impregnate for a while, then wiped oil in excess. I'm aware it may be less effective than re-infusing, but I think it could be OK for a few years.
Any ideas for the reason of the unexpected stop (and the fixing tips) ?
Kindest regards,
P. Buisson
buisson: I'm aware it may be less effective than re-infusing, but I think it could be OK for a few years.
I'm aware it may be less effective than re-infusing, but I think it could be OK for a few years.
It'll be OK for a few hours - perhaps.Come back a few days later and the problem will be back.It's not how sinter-bronze ("Oilite") bearings work. Any oil on the outside of the material gets pushed away.
The intermittent stop could be down to f.e. a bad relay or speed setting trimmer - or a bad motor.
Martin
I had the same problem with one of my 4002s and the culprit was a defective 1TR2 that sometimes, depending on various circumstances (temperature, for example), did not supply the correct voltage or none at all. Soldered a new TIP31 and that 4002 is running without any problems since then.
Good luckIngo
Thank you very much, Martin.
So I plan to use the tunrntable normally until the slowing-down problem reappear, and then I will try, carefully, the re-infusing procedure.
best regards,
Pierre