This unit has been a major pain.... the original symptom was the sound
cutting out on both channels. It would run normally for a while and then cut
out, or sometimes it would power on with no sound (relay clicks on, final
preamp and output stages are fine). Tapping the volume up or down control
causes it to come back on. Without a service manual, I could only take
guesses. I replaced two IC's (TC9177P and TC9185P, volume control) on the
control board, but no change. I replaced a third IC (AN4046 equiv) and again
no change. In desperation, I tried replacing every last transistor and
filter capacitor on that board, and checked the value of every last
resistor. STILL no change.
Never one to give up easily, I'm considering ordering a service manual.
But if there's a possibility of logic problems or other
expensive/tricky/impossible repairs needed, I don't want to waste $20 on a
manual. Do you think this is a simple problem or will it require too much
time and money to make it worthwhile? Or is it possible that the replacment
IC's were defective?
Thanks for any advice.

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