Thanks for the info! I think I would have to destroy it to open it, but someone tells me it sometimes works the flood isopropal alcohol in it and hope it reaches the needed area. So that is what I have done.
The board gives no part number if I need to replace the encoder. I wonder if I can hack this by soldering wires to the contacts of the encoder and touch two wires together to make it register a rotary step.
Yes, but there’s a spesific order which you need to touch the wires so that it registers movement in one way or the other. You could also solder wires to another rotary encoder and use that (assuming of course that the new part electrically matches the old part).
Spraying contact cleaner in the case might work too while rotating the knob. Just drowning it in something most likely won’t help much, but if you can get the encoder off the board then you can sink it in a isopropyl alcohol and rotate the knob around. Just let it dry properly before putting it back together, contacts may spark when used and if there’s alcohol vapours around that might cause some new and exciting problems.