Hello José
There is a group on yahoo which is specifically devoted to classic
(pre-MIDI) analog Korg synthesizers, it's called the KorgKornucopia.
http://launch.groups.yahoo.com/group/korgkornucopia/I think if you ask your question in that group, you will get responses
from people much more familiar with the MS-20.
Regards,
David
On 08/27/2012 03:46 AM, letcista wrote:
> Hello:
> I'm having dificulties in troubleshooting a tune problem on a MS20 synth.
> When I press a key the note stays tuned correctly, but when the key is released, if I have VCA HOLD or RELEASE above 0, the note tunes to half tune down (If I press a C3 note, when released it assumes a B2 note).
> I searched thru several posts but couldn't find anyone with a similar problem...
> Freq mod knobs are set at zero.
> Also:
> - Jacks were reviewed and ok;
> - Changed one of the VCA ICs which was dead but causing a diferent problem, not tune related;
> - Changed transistor Q23, Capacitor C6 and IC5 just to check;
>
> Q23 has 5VDC at is gate. When a key is pressed the Q23 gate's voltage drops to -1,5 VDC (wouldn't the normal be drops to zero?)
> After release the key, Q23 gate gets again 5VDC.
> Any help will be greatly appreciated.
> Thanks!
> Best regards
> José
> Portugal
>
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>
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