Yamaha CLP-550 Clavinova Service Manual

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Re: Yamaha CLP-550 Service Manual

Power supplies, power amp (via aux in), midi (as controller) OK, audio from the
keyboard is very loud and distorted with volume at "0", louder yet if you turn
it up. ~4vrms at processor board with loud note seems high.

I need at least the D to A converter setup procedure and nominal levels as well
as the schematics for the filter board and waveforms.

Also, the power on with B1 pressed has no effect on the sound. Are there any
other resets?

Thanks!

Tom