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I measured without the Synth connected to the PSU. Just followed your hint and remeasured with the Korg connected, et voilà: +4,7v, +11,2v & -11,2v.
I'm from Germany, we have a line voltage of about 220v. The PSU is labeled as KLM-1269 (220/240).

It's glue, and can be troublesome. It may or may not be related to what you're experiencing. Thanks for the hint, i will try to remove it carefully from the circuit board and see what happens. I've had similar issues with keyboards (one being my Korg Triton) and the issue was caused by bad power ...

Hey guys, i just opened up the Korg and noticed this on the power supply unit. Did the capacitors leak here aswell or could this be glue?
Thanks again!

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Thank you both for your fast replies, really appreciating it!
I'm gonna open it up tomorrow and check the cables and voltages. I'll report back then

Hello, i just bought a used Korg M1 Workstation and i noticed that the Korg is kind of "crashing" whilst using it. By crashing i mean that the Display shows the same message as when you start up the Synth ("Korg Music Workstation M1") and after the message disappeared the Korg switches back to ...