I am not very versed in electronics repair. I’ve been playing an older Korg Delta for a couple years. Haven’t had any real issues. It could probably use a little more cleaning, but it’s been consistent. Recently, the tuning has become weirdly inconsistent. It will intermittently go out of tune by 1/4 to 1/2 step, and then often kind of corrects itself after a few seconds. Does anyone know what causes that? I’d love to try my hand at fixing the issue. It’s such a fun instrument.
You nailed it. I turned off the FM depth in the joystick control section, and the issue seemed to go away. Bends also seemed a bit inconsistent / strange when using the joystick. I definitely think it’s something in that section of the instrument. At least it’s playable with that knowledge!