I have problem with some of my flat keys: even when I touch the key gently it gives me full volume sound. It happens especially when I hit the key hard. I have my casio 1,5 years and after 1 year of using I had only one flat key broken. Now 5 of them have this issue.
SOURCE: My WK- 3700 Casio keyboard is malfunctioning.
One portion of the key scanning matrix has gone bad. First thing is to clean the contacts with 99% isoprophyl alcohol. These USUALLY consist of traces on a circuit board that conductive rubber "pills" under silicone rubber domes are pressed down. Each note usually has two contacts, one closes before the other. This creates "velocity" measurement for the key. IF ONE of the contacts for a key doesn't work, the velocity can detect that the note has actuated, but no release occurs.
This would be on the "STROBE" line for either the first or second contact for THE OCTAVE you have problem with. There are disconnect diodes that prevent sneak paths.
You could have one bad diode, a crack in the circuit board, or a bad connection to the keyswitch board.
SOURCE: I have a Casio Privia PX-320. The left side keys
Check that the front of the keys is not hitting the lower plastic case front. If they hit it, then you need to disassemble the case partly and see what has shifted. It is ALSO possible that something has caaaused the aftertouch sensor to move out of position and it is hitting the keys early. ANY of these conditions needs to be addressed before damage is done.
SOURCE: casio privia key issue
The only way to analyze this is to open the case. You may find contaminating material has gotten in, or broken part, or key slightly out of position on pivots or pivot plastic broken.
When opening, be VERY careful of the tender ribbon cables. Have a large work surface that you can unfold the top onto. Be careful to use correct screw lengths and thread in each place you removed.
SOURCE: Casio Privia px 130 One of
One of the two contacts for that key is not working. This could be dirty or damaged contact. They use a conductive rubber pills that the key presses against circuit board traces. One contact makes before the other and this is how velocity is sensed. Unless you are adept at this repair, I would recommend you take it in for repair. Chances are any part cost is negligible... mostly labor to open and access the contacts for cleaning. Clean ONLY with 99% isoprophyl alcohol and Q TIps... VERY GENTLY.
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