I put L3 back in. With the PS on I'm not getting any voltage across D6.
I also do not appear to be getting any voltage on the output side of the transformer.
The fuse tests fine.

How can I check the D1 rectifier?
Or is there something better to test next?

I removed L3 and tested it, and it has zero resistance, so I'm guessing it is not the issue

Firstly, thank you for keeping this thread alive for over 11 years! This was the only resource I could find on these power boards. Secondly, I misspoke in my previous post, I meant +5 volts. Currently, I am not getting any voltage at the output pins/connector. Before I was getting 5 to 6 volts at th...

Firstly let me say I have a limited understanding of electronics. I kind of understand how each component works, but how they interact is beyond me. If I can find a bad part I can replace it, but that is about it I picked up 2 Korg M1s at an auction, and luckily one of them work (except the buttons ...