Archive of the former Yahoo!Groups mailing list: Korg Poly800/EX800 Users

I don't really know a lot about electronics, but I can use a soldering iron and I've done a bit of minor modding of things in the past. I had previously installed the moog slayer mod and lithium battery backup into my Poly800, and was really happy with the results. So the other day I decided to put in the 12/24 db switch.

I had run out of shrink-tubing, so I took C103 right off the board and installed it switch-side. Except in a moment of idiocy I put the capacitor in backwards...

When I switched it on, the synth was still outputting, but really, really quietly (except for an initial "pop" when notes were triggered). Oh no! I opened it up spotted that I'd put the cap in backwards. I switched it around again but as I feared it was still doing the same thing.

Figuring I had probably busted the capacitor, I went into town and got a replacement. They didn't have any 10uF 16v caps, so I substituted two 22uF 25v ones, connected in series, instead. Which I think should be ok?

Anyway I put them in, definitely the right way around this time, but it's still making that same noise, or lack of noise. The wiring all seems to be fine and I can't see any shorts. So now I'm thinking maybe I caused another nearby component to fritz when I put the cap in backwards. If you turn the volume right up, you can hear that the keyboard is still making the right noises, so I'm hoping that it can be saved.

If anybody with a proper understanding of electronics has some insight as to what has gone wrong and what I could do to remedy it, it would be gratefully received.