Check the Files section as for how to replace the optocoupler.
Do not touch ANY of the trimpots, as once you replace the bad part it
should stay in its normal tunning.
--- In PolySix@yahoogroups.com, "David Davis" <feline1@...> wrote:
>
> After many years faithful service, my polysix seems to have
developed
> a tuning problem :-(
>
> Usually when I first switch it on, and initially hit the keys, the
> VCOs swirl around in pitch for about a second? (I presume that's
some
> kind of autotune routine or sthg.)
>
> However, recently, when I turn it on, this doesn't happen, and the
> oscillators stay at some kind of wierd tuning (all the notes seem
> stretched out, the octaves are about a third or more off pitch!)
>
> One time, I left it for about 20 minutes and when I tried again, it
> was back to normal.
> But yesterday it just remained in this wierd state.
>
> Any suggestions to make it behave?
> I made sure that the pitch bend wheel was centred at power up.
> The VCOs are switched to "stretch tuning" inside, but that's never
> been a problem before, and this is orders of magnitude more
stretched
> than that.
>
> It's not a NiCd battery calamity, as my Polysix was upgraded a few
> years ago to a "PolysixM" (with lithium battery) (Johannes
> Hausensteiner's mod)
>
> DAVID
>