Jul 20, 2021
Today on the bench : a Korg Micro-Preset M500 from the late 70's.
It has a strange sound matrix (string, wood, voice, bass) with also the possibility to use some synthesizer VCOs (with white and pink noise).
The sound is awesome with some kind of weird waves. It's possible to tweak the synth sounds with a few option (LFO, VCF, a little enveloppe, a portamento).
The little lilacs capacitors were very old and some of them leaked on the PCB. Some copper traces were destroyed by the electrolytic fluid from the caps. I removed them all and changed them by new ones.
The keyboard wire was also acting weird so I put a new one. Everything is fine now !!!