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.