Discussion about the Korg PolySix synthesizer

Finally got it working correctly -- bypassed CN06 entirely;  ran a 
line from the front panel to the mixing resistor for the CV summer, 
and everything is perfect.  While there were no shorted traces to be 
found, I think you may be right about noise proximity. Normally I'd 
want to know exactly what was wrong, but having a fully-functioning 
unit is enough for me -- now on to my other repair jobs.

By the way, would like to take this opportunity to publicly 
acknowledge your FINE Polysix repair site -- 
out of all the repair jobs I've tackled on various synths over the 
years, this is the only one where I had it all laid out, step by 
step, & didn't have to reinvent the wheel.
Thanks!

~GMM

--- In PolySix@yahoogroups.com, The Old Crow <oldcrow@o...> wrote:
> 
>   That is certianly strange.  The only thing I can note is the 
trace for 
> the pitch modulation to CN06-2 does run right through the splash 
damage 
> area of the original battery, so perhaps the trace got shorted or 
opened 
> and is picking up noise from another part of the circuit.  Another 
guess: 
> replace C43, which decouples noise on the pitch mod line from CN06-
2.
> 
> Crow
> /**/
> 
> On Wed, 3 Sep 2003, cavernosum6 wrote:
> 
> > Hi -
> > thanks;  had a few minutes last night -- disconnected the wheels 
from 
> > the front panel (no help); disconnected CN06 - 2 (no help);  
> > disconnected R9 that feeds the CV mixer IC 8 :  problem vanished.
> > 
> > Didn't have any more time (dealing with a dead Prophet 5 power 
> > supply), but it's aroused my curiosity:  why would pulling R9 do 
the 
> > job, when pulling CN06-2 had no effect? -- according to the 
> > schematic, it would be basically the same thing.
> > 
> > Hope to have more time tonight;  meanwhile, any further thoughts 
> > would be appreciated.