I have a Roland EM-1B and some keys are failing... I disassembled it, and the sensors are working correctly, even with velocity. If I press them directly with my fingers they work, also in locations known to work, ANY key that I put there work... But some keys as soon I assemble them back, they stop working again...
Does anyone have ANY clue to why this is happening?
EDIT: Seemly there are also a mechanical issue... I inserted a piece of paper between the keys and some rubber sensors, and it worked (even if in a unstable manner :/)