[sdiy] Korg Minikorg 700S issue

[Luís Marka]

Hey gang!

I am finishing a restoration on my good old Korg Minikorg 700S. I got it 
some 30 years ago and in fact, I think some of the front panel switches 
never worked properly before... now that I opened and cleaned every 
switch and slider, it indeed works so much better. However, two issues 
still remain: one, engaging the "Bender" switch takes it ou of tune: 
pressed keys never reach their intended frequencies; not sure if this is 
by design or not. Actually, holding a note and engaging Bender takes its 
frequency down. And two, releasing a key when Sustain (in fact, Release) 
is turned on makes the pitch slooowly slide down, almost like a pitch 
bend being applied to the note. Holding a key maintains the pitch, but 
soon as it is released, the pitch decays.

I already checked all resistors and replaced every capacitor around the 
Keio VCO module, but it made no difference. Has anyone ran into such 
issues before?


Thanks!
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