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I've been retired (electrical engineer) for almost 10 years and PWB technology has gotten insane! I cannot follow the traces on the RP-102 mainboard even with a jeweler's visor. I have repaired SMT PCBs under a microscope, so I know how challenging it is. This Roland RP-102 has a working sound circuit because it makes the sounds when I run the on board tests, but all of the keys are dead. I need the schematic so I can try to put a signal directly onto the mainboard via the keyboard connector. Then I can determine whether the problem is the keyboard or the mainboard.
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