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I just sold my Casio PX-A100 and the buyer found out that the on the last octave keys are out of tune, tried going to default settings. Out of tune keys - A,B,C - the last keys of the keyboard + weird thing with F key.

When shifting octaves those same keys continue being out of tune (same sound).

When F key is held, the B key is not working. This behavior occurs for several combinations: (C(#88) <> G#, G <> F).

All of these issues are localized in the last octave )

It almost feels like there is a shorted circuit between these keys.

Have anyone encountered this kind of malfunctions? How did you fix it?

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