[sdiy] Korg Minikorg 700S issue

[S Ridley]

In the 700, the portamento pot sits between the S&H fet and capacitor, so
if any cleaning fluid got left on the portamento pot, it might give a
discharge path to the pot case and ground.  It might be worth checking that
before taking the board out.  You could disconnect the pot - remove the two
wires from the pot and join them together - then see if the pitch still
slides down.

Steve


On Sat, 21 Dec 2024 at 13:53, Luís Marka via Synth-diy <
synth-diy at synth-diy.org> wrote:

> 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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