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Keys on Casio keyboard are inoperative

There are 8 keys in sequence that sound only once when my Casio keyboard is powered up, then they won't sound again until the unit is powered down and then powered back up. When it is powered up again, the same keys become inoperative after they are struck once. I have two WK-3000s that developed the same problem about 30 days apart. The second keyboard's malfunctioning keys are at a different octave than keyboard #1 above.

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  • ginocumbe Mar 08, 2009

    I have a Casio WK-3500. I have a similar problem. When i turn on the keyboard, there is a particular block of keys that when struck, they only play once... then maybe after 30seconds to sometimes 5mins, they will become operational again.


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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.

Posted on Nov 27, 2010

  • coral_bay_co Nov 30, 2010

    Update: Done with synth repair. Not completely sure wich thing I did got it working. I took it apart

    down to where the key button contacts are. They are similar to what they use in remote controlls,

    where the black pad is pushed down onto black "painted on" traces to complete the circuit. I used a

    tooth brush to move away some light corrosion around the ribbon cable solder points. Did not seem to

    be enough corrosion to cause the problem. I also pulled up the rubber side of the buttons. At first

    they seem to be glued down then after gently pulling one up I found it was only a tight fitting

    rubber push thourgh foot type of thing. Easily pulled out and replaced, I used a jewlers flat

    screwdriver to push it back in. While the button pad was up I lightly brushed the "painted on" black

    traces with a tooth brush. They also did not seem to be corrded enough to cause any problems. Giving

    up I reassembled and was surprized to find the 8 keys in question worked fine and repeatedly as they

    were supose to. Though the key just left to those 8, that used to work, stoppe working. Well it

    would work randomly, though it always sounded as if I hit the key hard even if I pushed it down

    softly. So I dissasembled it again, this time finding that the painted on black traces has lifted

    off, seemingly due to the lubracant used on the mechanical part of the key weaights. As I do not

    have the bottle of paint on stuff, I attempted to repair by soldering two thin wires to make the

    contact - this was extreamely difficult. Re asembled and the key that was working randomly now works

    great, though the 8 keys from before stopped working. I dont think soldering wires for all 8 keys is

    a good solution, I will tell my customer that I may be able to find a bottle of the paint on stuff

    and can try that to fix them, though my observations make it seem to be another issue causing it.

    This is inconclusive but more info for the next guy to go on.


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