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What model? Diodes are either burned up (but you would see the ends still present) or missing because they aren't applicable to that model. It's more likely the rubber pads under the keys need to be replaced
Hi, I’m repairing a casio cdp-220r for the same reason. The F3 key does not sound at all and some adjacent keys sound louder than the rest at normal play attack. I will have to replace the entire octave memebrane as I found that it was broken when I finally got access to it. See phot
It sounds like the sustain is stuck on as if a sustain pedal is active. You don't mention if you have one, however if you MIGHT have one and you have used a Roland pedal, that brand is reverse sensed and would cause note to remain on.
You may need to install the drivers to give the computer to fully recognize the keyboard. The computer may see the keyboard, but isn't recogning it fully due to the lack of drivers.
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.
Most of these have VELOCITY sensing and that involves two contacts per note. If the velocity sense on those notes is somehow not working, broken wire or trace on the board or short that MIGHT cause your problem.
From the FILE menu, select INITIALIZE to select the sub menu. Select the SYSTEM option to return the keyboard to its factory settings. Keep in mind that this operation will delete anything that is stored in the keyboard memory. When you see the InitSys? on the screen, select YES. I hope this helps..........
Just wanted to "chime" in. I just recieved a Casio keyboard from a customer with this same problem to work on. I initially found 4 corroded solder joints. Repaired them, same problem. Ginocumbe's description leans me towards capacitors. Will let you know what I find or even if I cant figure it out. Though 2 years ago, you probably added your synth to the land fill.
Remove all power sources for at least 2 minutes. That means removing the batteries and power cord completely from the K board. Then try again. If that doesn't do it, it'll be time for a service visit...accordianman
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