Description
WV863100 Main DM circuit board for NP31 keyboard
If your keyboard does not start and the LED does not light at all then providing the power supply is correct (voltage and polarity) the fault probably lies on the DM board and Yamaha recommend that this should be replaced.-
See attached flowchart from the service manual.
Board marked : YD096 #3243
Yamaha DM Board NP31
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