Thanks for that Bob. That all sounds pretty frustrating. Mine is working after a 20 min warm up period or so and I've ruled out the ssm as well.
Based on your experience I'll start by sticking a new turnpin socket in, reflow everything and perhaps give it a clean as well then take some freezer spray to the circuit. Will let you know how I get on. Did you change all the ceramics (these can breakdown) and mylars around the filter chip then?
And have you had any other associated issues with that voice? I have a different voice which is pretty much a semitone flat of all the others, that also takes around 20 mins or so to settle.
Pat
--- In PolySix@yahoogroups.com, Bob Stewart <bob@...> wrote:
>
> Hi Pat.
>
> No didn't get to the bottom of it, but it wasn't any of the following...
>
> Filter chip, electrolytics, filter caps, control inputs (multiplexers), VCA
> transistors (just incas it was a loading issue).
> The only thing I did that seemed to make difference was to clean the board
> with isopropyl. The effect of doing this was that once the Polysix
> has warmed up.... The problem disappears.
> I can only think that the issue is related to either spillage, or
> electrolyte on the board in that area.
>
> If you have any joy, please let me know.
>
> Cheers
>
>
> B
>
> On Wednesday, July 31, 2013, murger wrote:
>
> > ∗∗
> >
> >
> > Hi Bob,
> >
> > Any luck with this one? Got the same issue. Looking at the 560p between
> > pin 4 and 5 of the ssm.
> >
> > Pat
> >
> > --- In PolySix@yahoogroups.com <javascript:_e({}, 'cvml',
> > 'PolySix%40yahoogroups.com');>, Robert Stewart <bob@> wrote:
> > >
> > > First thing I did.
> > > Problem is not the SSM2044
> > >
> > > :-s
> > > On 10/07/2013 14:53, alesisfusion8hd wrote:
> > > >
> > > > Have you swap SSM2044 with another voice to make sure the issue
> > > > follows the filter? Never serviced a Polysix though, but I had a
> > > > similar behavior on my Trident MkII. The SSM2044 was faulty.
> > > >
> > > > HTH
> > > > François
> > > >
> > > > --- In PolySix@yahoogroups.com <javascript:_e({}, 'cvml',
> > 'PolySix%40yahoogroups.com');> <mailto:PolySix%40yahoogroups.com<javascript:_e({}, 'cvml', 'PolySix%2540yahoogroups.com');>>,
> >
> > > > "blzproductions" <bob@> wrote:
> > > > >
> > > > > Hi
> > > > >
> > > > > Servicing a Polysix for a client, and have come up against a weird
> > > > issue, which I can't fathom. Hoping someone out there has had a
> > > > similar issue, and may be able to help...
> > > > >
> > > > > One voice has a faulty filter section in that the resonance can be
> > > > adjusted as per the line up procedure, but then if you lower the cut
> > > > off, the resonance decreases.
> > > > >
> > > > > I have ruled out the problem being the SSM2044, all signals coming
> > > > into the chip (ie. cut off/resonance control etc.) look correct, and
> > > > are comparable, and I'm pretty sure it's not the filter caps as
> > > > they're not electrolytics or Tantalums.
> > > > > Also the connections between the caps and the filter chip are all OK.
> > > > >
> > > > > If anyone has any ideas, please get it touch. It's beginning to
> > > > drive me mad.
> > > > >
> > > > >
> > > > > Bob
> > > > >
> > > >
> > > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>