The control pots are demultiplexed on the CPU board by ICs 18 and 19 --
the schematic for the CPU board shows which CV (Cutoff, Attack, Effects
Speed, etc) is controlled by which pin. A scope is essential for
tracking down this type of problem. Look at pins 9, 10 and 11 of those
two chips to see if all timing signals are present; look at pin 6 of
each chip to see if the timing signals are there. Pin 3 of each chip
should show you the ADC signal, which should show meaningful response
when any of the front panel pots is turned.
It's also possible the problem is on the front panel; check out the ADC
signal to connector CN11-2.
~G
On 1/17/2013 11:29 AM, eric.pitra wrote:
>
> Is there anyone in this group who could help me with this issue? I
> guess all I really need is to be pointed in the right direction. I
> would love it if someone could help me out.
> Thanks,
> Eric
>
> --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>,
> "eric.pitra" wrote:
> >
> >
> > I actually found and fixed two more bad traces buy checking and
> triple checking the board, my bad. Now the battery is installed and
> still the same problems exist. I can tell that pulse width modulation
> is happening and is stuck on. The Lfo LED appears to either be stuck
> on or going at a very high rate and none of the bank LEDs are lit. I
> believe all voices are functioning. Does anyone have any thoughts on
> this or is there by chance a prior post that would be good to read? I
> wasn't able to find anything obvious.
> > best,
> > Eric
> >
> > --- In PolySix@yahoogroups.com <mailto:PolySix%40yahoogroups.com>,
> "eric.pitra" wrote:
> > >
> > > Hello,
> > > I recently acquired a polysix in rough shape. I tested out the
> battery board and the new connections for the corroded tracks seem to
> be all good. I have not installed the new battery yet but tested it out.
> > > The arp functions along with the rate knob, the keys function but
> need all contacts cleaned badly. The control knobs do not effect sound
> at all except for the Attack which only functions rarely. The
> connectors leading from the battery board to the controls are good.
> The Mod wheel functions properly along with the bend and tune. Is
> there an obvious area to look at regarding this issue? Thanks for any
> input.
> > > Best,
> > > Eric
> > >
> >
>
>
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