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Old 6th Feb 2019, 11:51 am   #7
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,484
Default Re: Yamaha CLP411 Electronic Piano

Glad you got the diagrams OK.

Audio instability like that sounds (potentially) like a problem with a supply decoupling capacitor somewhere.

I have a Yamaha SY22 synth which developed a problem in the audio output stage and when I looked, found that three capacitors - all the same type - had leaked electrolyte which had in turn dissolved some of the PCB tracks in the local area. So keep an eye out for electrolytics with dark liquid stains or crystalline deposits around or under them.
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