I have a key on my Roland D-20 keyboard that doesn't work and don't know if I should fix it myself or have someone else do it who knows how.
What is involved in fixing a key?
I have a Roland D-50 that is from the same era as the D-20, so the mechanism should be about the same.
Usually problems with keys not working properly is related to the circuit board contacts getting dirty.
Be sure to read all instructions before attempting this. If you do not feel comfortable taking the keyboard apart, take it to a qualified service center.
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Just a thought: I have had keys on synths stop working where they had been heavily used to input drum patterns, the same keys being tapped with gusto to achieve that authentic rhythm... Anyway, it turned out that under the keys was a plastic lug that pressed down on rubber tubing to trigger the note. Over time, the lug had cut through the tubing, which caused the keypress to be missed.
The fix was to tape over the split tube, so that the lug pressed something, rather than going into the cut, allow it to respond to keystrokes again. (Also bought a dedicated drum pad for input).
n.b. To be honest, I don't know if this applies to the D-20 but saw this on a DX9 and Sixtrak iirc.