How to mend Radioshack Md-1121

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

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Technics Digital Piano PR370 sound problem?

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

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

wrong plug?

Hissing Sound?