I know this is late but I see this question come up a lot. People mention stuck or sticking keys which stay pressed or stay on after being played.
I had this issue on a WK-1800, essentially the same as the WK-1630. The fix involves applying ~3.1V to the suspect keyboard matrix line. You can determine the keyboard matrix line by inspecting the PCBs below the keyboard, or by looking at the schematic in the service manual ([link|https://www.manualslib.com/manual/2572980/Casio-Wk-1800.html|WK-1800 manual]). In my case, applying anything from around 2.8V up to 3.9V would work, except at lower voltages the keys would be erratic, at higher voltages they would get overly loud. I created a resister bridge to get the voltage needed, if the bridge has too much resistance it doesn't work, I ended up with around 10k total bridge resistance which seemed to work well.
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Schematic of what I did:
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Schematic of what I did (resistor values are approximate, it took experimenting to get it right):
[image|3353206]
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And a pic of the actual hardware:
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And a pic of the actual hardware (it looks like the resistors are shorted but it's just the angles):
[image|3353207]
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Also applies to other Casio keyboard models, CTK etc.
Hi,
I know this is late but I see this question come up a lot. People mention stuck or sticking keys which stay pressed or stay on after being played.
I had this issue on a WK-1800, essentially the same as the WK-1630. The fix involves applying ~3.1V to the suspect keyboard matrix line. You can determine the keyboard matrix line by inspecting the PCBs below the keyboard, or by looking at the schematic in the service manual ([link|https://www.manualslib.com/manual/2572980/Casio-Wk-1800.html|WK-1800 manual]). In my case, applying anything from around 2.8V up to 3.9V would work, except at lower voltages the keys would be erratic, at higher voltages they would get overly loud. I created a resister bridge to get the voltage needed, if the bridge has too much resistance it doesn't work, I ended up with around 10k total bridge resistance which seemed to work well.
Schematic of what I did:
[image|3353206]
And a pic of the actual hardware:
[image|3353207]
Also applies to other Casio keyboard models, CTK etc.