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OpAmp, you nailed it! I ordered two new knobs from Syntaur and some soldering time later everything works like a dream.

Thank you so much!

Thank you OpAmp

I'll explain the multimeter thing soon but in the meantime here is the test you described which also (imo) seems to implicate knob 3's capacitor

https://www.youtube.com/watch?v=hyegarkjpfA

Let me ask - if C112, the capacitor on Knob 3 was defective, could it potentially cause this behavior? I just connected my multimeter across the poles of the pots to the far end of the capacitors and they all looked fine to me, except for VR4 -> C112 which stayed at a value of 0L consistently and ...

Hey again OpAmp! Thanks for replying. I'll check the capacitors now - regarding the knobs: I did apply some deoxit and while the knob action is very nice now, the tracking issue still remains. I'll report back with the capacitors. I'm not exactly certain right now but it looks like the knob 1 value ...

Hello again! Riding the winning streak of fixing my first "as-is" Microkorg, I decided to try my luck again and pick up another unit to try and refurbish. This time the main problem seems to be with the tracking on the edit param knobs. Here's a video of the issue: https://youtu.be/D67bPxGmYSo A ...

That was it! The trace was bad. I wired a jumper cable in and that fixed the arp toggle. The unit is still pretty beat up cosmetically but it's fully functional now

Thank you OpAmp for all your help.

Ok, staring at this some more and trying to figure out more about what's going on (or not going on) https://i.imgur.com/S3g3j2b.png Am I correct in reading this schematic that one of the poles of SW17 should connect to one of the poles of SW4, the arpeggiator switch? Because putting my meter in ...

Well, I got a multimeter with a diode test function and... for better or worse D16 seems to be functioning properly

What now?

Thanks for your reply. I downloaded the service manual. Looks like I need to get a multimeter with a diode test function now! I did test the traces between the dpdt switch, the diode in question (D16) and the next D19 and it all seem sto work but I can't tell if the diode itself is functioning ...

Hi there, I recently picked up a used "as-is" Microkorg and I love it! However, the arp toggle button doesn't seem to function. I'd love some help troubleshooting it if help is available. The status currently is that every other knob and button works except for the arp on/off button, and even the ...