Discussion about the Korg PolySix synthesizer

This describes my problem exactly... Did you ever find a fix?

- Daniel

--- In PolySix@yahoogroups.com, jure zitnik <kokoon@...> wrote:
>
> here's the thing:
> i'm not repairing the polysix myself but i'm still pretty involved
> since the man repairing it doesn't have that much experience with
> analogue synths. and i have zero experience with actual physical 
work
> on synths :/
> 
> so - the polysix:
> the battery leaked but the traces were repaired. this guy probably 
did
> it all correctly but i'm not 100% sure. let's say they're alright 
now.
> we also replaced IC31 (the lower of the 2 identical 4xAND gates) but
> the symptoms are still the same as they were before the repair:
> - synth usually works okay for the first half hour or so. except the
> patch storage.
> - patch programmer: bank 3 and prog 3 are lit all the time. you can
> select another bank and program but nothing can be saved.
> - the attenuator 13 way switch doesn't work at all.
> - after some time other controls stop responding (and stay like they
> were set): waveform selector, VCA gate mode and effect selector.
> - usually when this happens some program and bank leds (actually 
bank
> 1 and 2 and program 2) start dimly blinking like there's some short
> circuit or something. this gives me doubts whether it's really CPU
> (IC21) fault. if it were faulty it would probably just die or
> something... right?
> 
> so - what would you guys check next? how possible do you think it is
> that it's the CPU? what about the 18-pin SRAM IC? any other ICs that
> usually fail?
> 
> i really appreciate your help so far!
> 
> thanks!
> jure
>