4002 speed Instability

5 replies
K(
Offline
Keiko5 (archived)
Bronze
Posted September 30, 2011 at 14:30 GMT
#1681424

My Beogram 4002 has started to exhibit some speed instability (slowing) during play.  It doesn't play steadily slow, but seems to fluctuate, slowing slightly (but very audibly) then returning to normal.  I eliminated belt slippage or motor capstan slippage as the problem, so it seems that its some poltergeist in the electronics.  The innards of the deck look absolutely unmolested, and there are no visible clues as to the source of the problem.  I don't mind replacing caps or other electronic components, but I am hoping to get some direction on where to start.  Any help or advice will be much appreciated.  As would words of encouragement.

Cheers,  Kevin

RI
Offline
richhaffner
Bronze
Posted September 30, 2011 at 15:21 GMT
#1681425

Words of encouragement I cannot offer you.  Sorry.

What I can tell you is that the symptom you describe is what happened with my BG4002 a few months ago.  See this thread.

The ultimate cure was a new motor professionally installed.

Good luck!

S(
Offline
Step1 (archived)
Bronze
Posted September 30, 2011 at 17:46 GMT
#1681426

Could be the potentiometers, relay contacts or capacitors probably in that order. Could be the motor. Have you tried a drop of oil but obviously make sure it doesn't contaminate the belt.. How did you eliminate the belt by any chance?

 

K(
Offline
Keiko5 (archived)
Bronze
Posted October 3, 2011 at 10:13 GMT
#1681427

Thanks for the reply and suggestions.  I changed the belt and cleaned the platter rim and capstan, so I am pretty confident that belt slippage is not the cause.  I'll take a closer look (and listen) to the motor, add a drop of oil as a precaution, and clean the contacts.  I'll let you know how it goes.

Kevin

RI
Offline
richhaffner
Bronze
Posted October 3, 2011 at 12:39 GMT
#1681428

Be sure and exercise the pots while you're in there, too.

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