How to mend Korg C-36

How can I fix my Electric Roland Piano - notes not playing?

my piano soft pedal wont work?

Technics SX-PX554 no sound?

i have a ROLAND RD-150 with tow keys with no sound, can i fix it?

How can I fix a keyboard with dead keys. ?

fix speaker?

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wrong plug?

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korg c 15s service manual?

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No sound?

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elka x30?

Why do yahama use plastic key boards when their products are so expensive?

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My top Bflat on my Roland 4500 piano has suddenly ceased to work?

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No sound when I play my Technics SX PR170 digital Piano?