SOURCE: My Clavinova CVP 305 Piano will no longer play the
The EPROM IC might be defective and might need a change but with the help of the Yamaha service.
Howeverr leave the set ON ffor several hours if you have not used or sparingly used.Sometimes moisture within the set can cause these issues which ccan clear up when the capacitors charge up or the board warms up.The interface is having some errors /conflicts that cause this conectivity.
So keep playing , do not switch off .
Hope this tip helps.
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