Connectors can become loose over time. Corrosion can build up around the terminals and cause increased resistance. Faulty wiring or bad or loose connections are the most common cause of this problem and should always be checked first.
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I think that you need someone who knows how to open the Clavinova and replace the floppy disk drive in it.
Aside from getting the floppy drive replaced, there's not much to this repair, aside from the removal from the Yamaha Clavinova's case.
(How is the floppy drive not working? if there is an error code, please mention it.)
What is the model # ***** your Clavinova, please?
What is your local zip code, also?