Beogram 4002 stopping suddenly

6 replies
B(
buisson (archived2)
Bronze
18 posts
Posted February 2, 2020 at 21:01 GMT
#2133083

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)

S(
sonavor (archived2)
Bronze
3536 posts
Posted February 2, 2020 at 23:10 GMT
#2133084

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. 

B(
buisson (archived2)
Bronze
18 posts
Posted February 3, 2020 at 17:44 GMT
#2133085

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

DI
Dillen
BronzeModeratorFounder
12777 posts
Posted February 3, 2020 at 21:22 GMT
#2133086

buisson wrote:

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

 

KA
Karnayna
Bronze
29 posts
Posted February 4, 2020 at 08:11 GMT
#2133087

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 luck
Ingo

B(
buisson (archived2)
Bronze
18 posts
Posted February 4, 2020 at 15:43 GMT
#2133088

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

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