Two keys making weird noise


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Hi!
my Casio digital piano px 750 making weird noises on these two keys, any suggestions how can I fix that?

video of the issue
 
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happyrat1

Destroyer of Eardrums!!!
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Very weird.

Seems like something in the signal path is crosstalking for the 2 keys in question.

Possibly a shorted diode or capacitor in the keyboard multiplexer circuit.

This is definitely a screwdriver and soldering job.

You could contact Casio and locate an authorized service center in your area.

If it's no longer in warranty this will cost you a couple of hundred to repair.

Gary ;)
 

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