Fixing a Yamaha PSR-280 electronic piano that has some keys that are not making any sound. Turns out there was some corrosion on the board which took out a trace . I put a jumper wire in and the keys are now working. Some of the keys share traces which explains why quite a few stopped working at once.If you don't want to do the soldering you could probably find the replacement boards easy enough just type the code on the board into google.
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Yamaha PSR-280 Electronic Keyboard Some Keys Not Working Repair
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