Hi, glad to find this group! I got a second hand Korg poly 800 MkII that had a dead battery which I've fixed up, now that I can make a patch and save it on it, I've discovered something else.
The problem is when you apply pressure to the whole case, either by twisting it or pushing on the keys harder than normal, the whole pitch of the keyboard changes! I have no idea why! It can go out by over a semitone, so the tuning slider doesn't solve it. This makes it unable to play with other instruments.
Would anyone have ANY clue why this would happen? I'm up for poking around in side if I need to. Also looks like someone has trying to install their own audio jack on the opposite ends from the rest to make using it as a keytar easier, but I'm pretty sure its not wired up.
I'm going on holiday tomorrow for a week so might not be the fastest at replying or getting photos if anyone wanted.
I would love to mod this if I can solve this problem!
Thanks!