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Yamaha P2200 - VU meters display strong pulse every few seconds

H

Hifibythekg

Super Member
Have just noticed that the VU meters on my recently acquired Yamaha P2200 have begun to act strangely. They both lie dormant then but shoot across the display every six seconds!

The movement is not related to the music playing while connected to source (a Chord Hugo DAC.)
Switched off source and the needle pulses continued exactly as before.

Have now switched off the amp.

Sound quality has been just great and no odd sounds related to the pulses..

Recently cleaned up the unit and adjusted bias but changed nothing inside - all seemed pretty good but was planning on replacing the VU bulb meters as most of them have failed.
Sounds so good that I think this will be my main amp for a very long time.

Any suggestions as to what the cause might be?
 
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Thanks.
Yes, I’ll do this when I go back in to change the bulbs.
In so far as this is likely just an issue with the metering display should it be ok to continue using the amp for another couple of weeks?

Also, when I checked speaker outputsa few weeks ago..

After 10 mins..
Left channel is rock steady at 2.8 mV
Right channel flickers up and down between 28 mV and 36 mV.

Any likely suspect components to check for fixing this?
 
every 6 second ? Nothing else than electronic problem !

For your information Meters are the same in YAMAHA B2 only the scale is different
 
I recapped and resoldered the meter board to fix my spastic needles, I've got high bias on one channel now and suspect a flaky trim pot. One of these days I'll get around to it.
 
Sorry, when you say ‘electronic problem’ please could you expand a little more?
I’m not sure whether you mean that solder reflow might be sufficient, or is it more likely a faulty component in your opinion?
Thank you for contributing.
 
Sorry, when you say ‘electronic problem’ please could you expand a little more ?

Yes , I mean a capacitor because of time constant
 
Thanks clinic-audio, appreciate the explanation. Most likely a capacitor on the meters pcb, or could it be located somewhere else?
 
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