Discussion about the Korg PolySix synthesizer

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 ?
> >
>