Just bought a P120 from craigslist. A computer recycle company was selling it as parts for $150. They said it has the SCN error code and the keys don't play. It played the demos only.. Payed $100; took it home, opened it up & found the keyboard plug had detached from the motherboard. Plugged it in & BAM! It works just fine.
I have now solved this problem. I had previously opened the top to fix a broken key and a connection had become detached. Thank you for your help.
That is an indication that an internal malfunction has occurred and it needs to be taken to a Yamaha dealer for repair. Try resetting to defaults first. Go to this link for a manual:http://www.yamaha.com/yamahavgn/CDA/ContentDetail/ModelSeriesDetail/0,6373,CNTID%253D2425%2526CTID%253D205800%2526VNM%253DLIVE%2526AFLG%253DY,00.html# and look at page 44 and follow the instructions. Hold the rightmost key on the keyboard while turning the Standby/On switch to the On position.
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