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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