Discussion about the Korg PolySix synthesizer

Urrrrrgggggg !

This is driving me nutz !

The chorus/Sub problem probably was related with bad contact of the 
panel connectors. This is OK now, but when I checked the instrument 
again, if worked well for a few minute, and just than started to make 
some noise as tweaking the knobs, and the programs section now 
sometimes doesn't let you get banks B, 2 and 6, and will lite up the 
Manual button led when pushing the "Write" button.

I can see on the schematics that the Write, B, 2 and 6 buttons are 
all connected to IC30 eventually, but it was already replaced, and 
has no bad traces going from it.










--- In PolySix@yahoogroups.com, "gil_we" <gil_we@...> wrote:
>
> It looks a few problems still remain -
> 
> I just noticed that whatever setting you use, the Chorus effect is
> always working (very interesting sounding when using the Phaser or
> Ensemble, which play with the Chorus....). Also, when I use the Oct 
2
> setting (on Sub Osc), the root sound doesn't play.
> 
> Can you think of any direction ? I suspected IC34 and IC29, but no
> harm to them and no corrosion at all at this area....
> 
> Thanks !
> 
> 
> 
> --- In PolySix@yahoogroups.com, "gil_we" <gil_we@> wrote:
> >
> > Sure. As I said, IC30 was the culprit.
> > 
> > 
> > --- In PolySix@yahoogroups.com, "muffclone" <muffclone@> wrote:
> > >
> > > -HELLO
> > > THIS PROBLEM IS THE BAD TRACES OF IC30 AND IC31 (TWO 74LS08) 
AND 
> > REPLACE THIS 
> > > IC´S
> > > AND THE VIAS OF THE BOARD CAN BE BAD.
> > > SORRY FOR MY ENGLISH.....
> > > MERRY CHRISTMAS!!
> > > -- In PolySix@yahoogroups.com, "gil_we" <gil_we@> wrote:
> > > >
> > > > I have a nice looking P6 here. Battery has leaked and 
severely 
> > damaged
> > > > the 74L08 near it and all traces beneath. The symptoms where
> > > > non-functioning Release and VCO '16 Oct functions, and cases 
> > where a
> > > > few preset leds light up together including the Write button 
led 
> > which
> > > > will sometimes light on and will not turn off. Also, pitch 
and 
> > cutoff
> > > > can change spontaneously as you play some chords.
> > > > 
> > > > I had it retraced and cleaned of course, and replaced the 
74LS08 
> > and
> > > > 4011 above the battery (although the latter looked ok).
> > > > 
> > > > The current situation is that the Release and VCO '16 Oct 
> > functions
> > > > work ok, but the mess with the bank preset leds still exists. 
Can 
> > you
> > > > spot a particular IC which can cause the problem ? Other 
ideas ?
> > > >
> > >
> >
>