I experienced this issue as well. I still have not figured out what the cause is. I replaced the 4051's, swapped out CEMs from other voices, replaced the electrolytics, and still cannot make voice one tune. It seems to be happening to both oscillators on voice 1, so this is something affecting the CV coming from the DA I am guessing. Perhaps the offset calculations happening on the 4051s could be wrong? Does anyone have any ideas as to what else this might be?
-Rob

--- In chromapolaris@yahoogroups.com, "Paul D. DeRocco" <pderocco@...> wrote:
>
> > From: charlespjackson
> >
> > Recently I began to experience an issue with my Polaris going out
> > of tune. Upon doing some research and reviewing older posts here
> > regarding similar problems it appears that the culprit has been
> > narrowed down to a faulty Channel (1). If I manually disable
> > this channel then the Polaris functions and stays in tune just fine.
> > From what I've gathered so far it seems the problem might be some
> > bleeding and/or bad (Sample & Hold) caps?
> > I would just like to know if I'm accurately diagnosing the
> > problem and if so how intricate/expensive a fix this may be? Are
> > the parts necessary for such a fix available? Where might I be
> > able to locate them?
>
> I think it's usually the 4051 analog switches that leak. They're pretty easy
> to find, since they're near the left end of each channel, which are the six
> step-and-repeat sections on the right half of the board.
>
> This is a pretty easy thing to diagnose and fix, for anyone with a scope and
> good soldering skills. You can tell if a S&H is leaking by looking at the
> op-amp outputs (pins 1, 7, 8 and 14 of the nearby TL084/LF347 parts) and
> seeing if there's any sawtooth modulation larger than a few millivolts.
>
> --
>
> Ciao, Paul D. DeRocco
> Paul mailto:pderocco@...
>