Old reply so hopefully it's fixed. Dust or hair can get through the gaps and land on or near the contacts of the electronic key sensors. To be on the safe side (rather than doing a diy) take it in to the technicians. They'll have it fixed in a jiffy
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: I have a casio wk-200 piano. I bought headphones
The keyboard has a mic jack that is the same size as the headphones. You probably put the headphone plug into the wrong jack is all.
SOURCE: purchased Casio Keyboard CTK-4000...it seems
Check for videos on YouTube. Also check for user's BLOGs for the Casio using Google. here usually isn't enough market for people to write 101 books as the technology and models change so fast.
Best way is to just dig in and try stuff and self-discovery results in learning stuff that sticks with you.
SOURCE: I have a Casio PX-800
If that is one of the ones with a plastic "hinge/spring", breakage is usually fatal... keep cord and plug for junk box.
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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