Discussion about the Korg PolySix synthesizer

I just got this synth and it has something wrong with 7th and 8th
voices. When i´m adjusting eg intensity, filters for the last two 
voices are working opposite way :) i opened it and found that all the 
vcf:s were SSMT2044 except voice 8 wich was SSM2044 (maybe someone 
has changed one or all of them?!) and MC14066B chip at the 8th voice 
has been replaced with F 4066BPC (having "indiana" text on it).. 
anyways battery was brand new inside the trident, and everything else 
seems to work 100%. Any ideas how to fix this?

What do you mean by "opposite way" ??

The replacements seems fine to me.






--- In PolySix@yahoogroups.com, "roisto" <roisto@...> wrote:

>
> I just got this synth and it has something wrong with 7th and 8th
> voices. When i´m adjusting eg intensity, filters for the last two 
> voices are working opposite way :) i opened it and found that all the 
> vcf:s were SSMT2044 except voice 8 wich was SSM2044 (maybe someone 
> has changed one or all of them?!) and MC14066B chip at the 8th voice 
> has been replaced with F 4066BPC (having "indiana" text on it).. 
> anyways battery was brand new inside the trident, and everything else 
> seems to work 100%. Any ideas how to fix this?
>

I mean that filter of the last two oscillators has somehow turned to 
work negative. When cutoff filter is opened, one oscillator plays it 
closed (like lowpass effect), and vice versa, when filter is closed, 
one oscillator plays filter totally opened. Two modes at the Eg-mode 
seems to change this effect between 7th and 8th osc. Thank you for 
you reply.

-t



--- In PolySix@yahoogroups.com, "gil_we" <gil_we@...> wrote:
>
> What do you mean by "opposite way" ??
> 
> The replacements seems fine to me.
> 
> 
> 
> 
> 
> 
> --- In PolySix@yahoogroups.com, "roisto" <roisto@> wrote:
> >
> > I just got this synth and it has something wrong with 7th and 8th
> > voices. When i´m adjusting eg intensity, filters for the last two 
> > voices are working opposite way :) i opened it and found that all 
the 
> > vcf:s were SSMT2044 except voice 8 wich was SSM2044 (maybe 
someone 
> > has changed one or all of them?!) and MC14066B chip at the 8th 
voice 
> > has been replaced with F 4066BPC (having "indiana" text on it).. 
> > anyways battery was brand new inside the trident, and everything 
else 

> > seems to work 100%. Any ideas how to fix this?
> >
>

Does it happen only to one of the 8 oscillators ? if so, replace its 
SSM2044 chip....



--- In PolySix@yahoogroups.com, "roisto" <roisto@...> wrote:
>
> I mean that filter of the last two oscillators has somehow turned 
to 
> work negative. When cutoff filter is opened, one oscillator plays 
it 
> closed (like lowpass effect), and vice versa, when filter is 
closed, 
> one oscillator plays filter totally opened. Two modes at the Eg-
mode 
> seems to change this effect between 7th and 8th osc. Thank you for 
> you reply.
> 
> -t
> 
> 
> 
> --- In PolySix@yahoogroups.com, "gil_we" <gil_we@> wrote:
> >
> > What do you mean by "opposite way" ??
> > 
> > The replacements seems fine to me.
> > 
> > 
> > 
> > 
> > 
> > 
> > --- In PolySix@yahoogroups.com, "roisto" <roisto@> wrote:
> > >
> > > I just got this synth and it has something wrong with 7th and 
8th
> > > voices. When i´m adjusting eg intensity, filters for the last 
two 
> > > voices are working opposite way :) i opened it and found that 
all 
> the 
> > > vcf:s were SSMT2044 except voice 8 wich was SSM2044 (maybe 
> someone 
> > > has changed one or all of them?!) and MC14066B chip at the 8th 
> voice 
> > > has been replaced with F 4066BPC (having "indiana" text on 
it).. 
> > > anyways battery was brand new inside the trident, and 
everything 

> else 
> > > seems to work 100%. Any ideas how to fix this?
> > >
> >
>

thanks, i will try that. it does happen with 7th and 8th oscillators,
but only one at time. changing eg-mode seems to affect wich one is
malfunctioning.

--- In PolySix@yahoogroups.com, "gil_we" <gil_we@...> wrote:

>
> Does it happen only to one of the 8 oscillators ? if so, replace its 
> SSM2044 chip....
> 
> 
> 
> --- In PolySix@yahoogroups.com, "roisto" <roisto@> wrote:
> >
> > I mean that filter of the last two oscillators has somehow turned 
> to 
> > work negative. When cutoff filter is opened, one oscillator plays 
> it 
> > closed (like lowpass effect), and vice versa, when filter is 
> closed, 
> > one oscillator plays filter totally opened. Two modes at the Eg-
> mode 
> > seems to change this effect between 7th and 8th osc. Thank you for 
> > you reply.
> > 
> > -t
> > 
> > 
> > 
> > --- In PolySix@yahoogroups.com, "gil_we" <gil_we@> wrote:
> > >
> > > What do you mean by "opposite way" ??
> > > 
> > > The replacements seems fine to me.
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > --- In PolySix@yahoogroups.com, "roisto" <roisto@> wrote:
> > > >
> > > > I just got this synth and it has something wrong with 7th and 
> 8th
> > > > voices. When i´m adjusting eg intensity, filters for the last 
> two 
> > > > voices are working opposite way :) i opened it and found that 
> all 
> > the 
> > > > vcf:s were SSMT2044 except voice 8 wich was SSM2044 (maybe 
> > someone 
> > > > has changed one or all of them?!) and MC14066B chip at the 8th 
> > voice 
> > > > has been replaced with F 4066BPC (having "indiana" text on 
> it).. 
> > > > anyways battery was brand new inside the trident, and 
> everything 
> > else 
> > > > seems to work 100%. Any ideas how to fix this?
> > > >
> > >
> >
>

Very strange.... any battery leakage ?

Also, you may want to try to replace any logic IC connected directly 
with the problematic control, placed on the front panel's pcb...



--- In PolySix@yahoogroups.com, "roisto" <roisto@...> wrote:
>
> thanks, i will try that. it does happen with 7th and 8th 
oscillators,
> but only one at time. changing eg-mode seems to affect wich one is
> malfunctioning.
> 
> --- In PolySix@yahoogroups.com, "gil_we" <gil_we@> wrote:
> >
> > Does it happen only to one of the 8 oscillators ? if so, replace 
its 
> > SSM2044 chip....
> > 
> > 
> > 
> > --- In PolySix@yahoogroups.com, "roisto" <roisto@> wrote:
> > >
> > > I mean that filter of the last two oscillators has somehow 
turned 
> > to 
> > > work negative. When cutoff filter is opened, one oscillator 
plays 
> > it 
> > > closed (like lowpass effect), and vice versa, when filter is 
> > closed, 
> > > one oscillator plays filter totally opened. Two modes at the Eg-
> > mode 
> > > seems to change this effect between 7th and 8th osc. Thank you 
for 
> > > you reply.
> > > 
> > > -t
> > > 
> > > 
> > > 
> > > --- In PolySix@yahoogroups.com, "gil_we" <gil_we@> wrote:
> > > >
> > > > What do you mean by "opposite way" ??
> > > > 
> > > > The replacements seems fine to me.
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > --- In PolySix@yahoogroups.com, "roisto" <roisto@> wrote:
> > > > >
> > > > > I just got this synth and it has something wrong with 7th 
and 
> > 8th
> > > > > voices. When i´m adjusting eg intensity, filters for the 
last 
> > two 
> > > > > voices are working opposite way :) i opened it and found 
that 
> > all 
> > > the 
> > > > > vcf:s were SSMT2044 except voice 8 wich was SSM2044 (maybe 
> > > someone 
> > > > > has changed one or all of them?!) and MC14066B chip at the 
8th 

> > > voice 
> > > > > has been replaced with F 4066BPC (having "indiana" text on 
> > it).. 
> > > > > anyways battery was brand new inside the trident, and 
> > everything 
> > > else 
> > > > > seems to work 100%. Any ideas how to fix this?
> > > > >
> > > >
> > >
> >
>

fixed! my friend specialized to repair old gear replaced some IC´s. he
told me that someone has earlier tried to fix it also, and there was
some amateur-soldering made. someone had manually, by soldering,
tresspassed two IC´s functions. how weird is that :)

thanks for helping!


--- In PolySix@yahoogroups.com, "gil_we" <gil_we@...> wrote:

>
> Very strange.... any battery leakage ?
> 
> Also, you may want to try to replace any logic IC connected directly 
> with the problematic control, placed on the front panel's pcb..
> 
> 
> 
> --- In PolySix@yahoogroups.com, "roisto" <roisto@> wrote:
> >
> > thanks, i will try that. it does happen with 7th and 8th 
> oscillators,
> > but only one at time. changing eg-mode seems to affect wich one is
> > malfunctioning.
> > 
> > --- In PolySix@yahoogroups.com, "gil_we" <gil_we@> wrote:
> > >
> > > Does it happen only to one of the 8 oscillators ? if so, replace 
> its 
> > > SSM2044 chip....
> > > 
> > > 
> > > 
> > > --- In PolySix@yahoogroups.com, "roisto" <roisto@> wrote:
> > > >
> > > > I mean that filter of the last two oscillators has somehow 
> turned 
> > > to 
> > > > work negative. When cutoff filter is opened, one oscillator 
> plays 
> > > it 
> > > > closed (like lowpass effect), and vice versa, when filter is 
> > > closed, 
> > > > one oscillator plays filter totally opened. Two modes at the Eg-
> > > mode 
> > > > seems to change this effect between 7th and 8th osc. Thank you 
> for 
> > > > you reply.
> > > > 
> > > > -t
> > > > 
> > > > 
> > > > 
> > > > --- In PolySix@yahoogroups.com, "gil_we" <gil_we@> wrote:
> > > > >
> > > > > What do you mean by "opposite way" ??
> > > > > 
> > > > > The replacements seems fine to me.
> > > > > 
> > > > > 
> > > > > 
> > > > > 
> > > > > 
> > > > > 
> > > > > --- In PolySix@yahoogroups.com, "roisto" <roisto@> wrote:
> > > > > >
> > > > > > I just got this synth and it has something wrong with 7th 
> and 
> > > 8th
> > > > > > voices. When i´m adjusting eg intensity, filters for the 
> last 
> > > two 
> > > > > > voices are working opposite way :) i opened it and found 
> that 
> > > all 
> > > > the 
> > > > > > vcf:s were SSMT2044 except voice 8 wich was SSM2044 (maybe 
> > > > someone 
> > > > > > has changed one or all of them?!) and MC14066B chip at the 
> 8th 
> > > > voice 
> > > > > > has been replaced with F 4066BPC (having "indiana" text on 
> > > it).. 
> > > > > > anyways battery was brand new inside the trident, and 
> > > everything 
> > > > else 
> > > > > > seems to work 100%. Any ideas how to fix this?
> > > > > >
> > > > >
> > > >
> > >
> >
>