Hi. I'm trying to repair Yamaha PSS-560 keyboard that has no sound. I have the service manual. The lights come on, power is there. Tried probing for sound at the amplifier chips IC16 and IC19 with no luck. I noticed some black wires going from main IC1 chip but they aren't called on the page 13 wiring diagram in the manual. What do you think? What else should I try to see which part isn't giving sound? Thanks
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