How to mend Korg C-15s

Technics Digital Piano PR370 sound problem?

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Need a main board for my pr370?

No sound?

wrong plug?

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fix speaker?

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

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need new cord?

my piano soft pedal wont work?

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korg c 15s service manual?

how can I fix my Clavanova CLP-950 two keys make no sound?

How can I fix the back-light in the LCD screen in my Yamaha PSR-630 keyboar?