cloud wrote:After 35 years of flawless operation my Korg MS-20 croaked - literally. The top two keys issue a low croak that represents somewhere far south of the low end of the keyboard. The remainder of the keyboard is silent. Interestingly, I was about to use it to generate a storm effect, which would probably be fine, but apparently (given that it is now dismantled) this has precedence.
Poking around with a multimeter suggests the keyboard and most of the synth is still functional. The waveforms, scale (16', 8' 4' etc), filters, modulators, EG's white and pink noise sources are all fine. The problem seems to be the frequency being fed to the oscillators. I'm about to start troubleshooting the IC's. If anyone has pointers or had a similar experience, I'm interested in feedback.
Bitexion wrote:Does modulation of the filter produce sound? Try set just noise and filter LFO modulation. If that makes the expected swooshy sound, the CV from the keyboard is borked.
I had that issue with my MS-10 and the tech found that the cable from the keyboard to the VCO pitch was broken. He replaced it and everything worked fine again.
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