The encoders can become "jumpy." Often, they just need cleaning with electrical contact cleaner, but sometimes they require replacement. 3. Keybed Issues (Dead Keys/Weighted Keys) If keys are not producing sound or feel sluggish:
A typical service manual for the Korg M50 would include: korg m50 service manual
Always unplug the external 12V AC adapter (Korg KA320) and all audio/MIDI cables before loosening a single screw. The encoders can become "jumpy
Hidden in the service manual is the key combination to enter "Test Mode." Usually, this involves holding while powering on. The diagnostic menu allows you to: The encoders can become "jumpy." Often