The power on circuit looks right. It's difficult to solve this...

I recorded a video to show the issue better....

I will check these points out! Thanks.

Another thing... Do you know what is that "pot" below the synth? Looks like a screw, but is a pot. I didn't find what its set.

Hi, I need help with the old guy Roland sh-1000. The tune is the main issue... I have to do the calibration, but before that I'm trying to get it stable. I will try to explain the issue: For example, when I play and hold a F1, it looks stable. But if I play a note higher like a F3, and again a F1, n...