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Technics Digital Piano PR370 sound problem?

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my piano soft pedal wont work?

How can I fix a keyboard with dead keys. ?

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Technics SX-PX554 no sound?

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

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

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Technics PR602 replacing the disc drive with hard drive?

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

fix speaker?

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