Well, what are the other hints? I'm curious...
as for the 4066, I had a few going bad on my Kawai SX210, interesting
input.
I would not sell the MK2, I like mine so much. But if you still want
to sell it I know someone in the UK who will be more than happy to
buy it from you.
--- In PolySix@yahoogroups.com, Niels Ott <niels.ott@...> wrote:
>
> Hi gil and others,
>
> no unfortunately not. I'm quite busy so I didn't find time for
further
> experiments. I got some great hints from German synthesizer gurus,
though.
>
> One of those hints said: The 4066 chips go bad whenever the voltage
on
> their input comes close to their supply voltage. So if you're
messing
> with those, put them on a socked and be sure to have replacements
> available...
>
> And some other hints, now I hope to find the time soon.
>
> Still I'm wonderhing whether I will sell the Trident MK2 or not
once I
> got it fixed. I'm not a collector, I'm trying to be a musician.
>
> Best,
>
> Niels
>
>
> gil_we schrieb:
> > Hey, any news ?
> >
> >
> >
> >
> > --- In PolySix@yahoogroups.com, Niels Ott <niels.ott@> wrote:
> >> Hi gil,
> >>
> >> the SSM∗ are OK, I checked them. I had a nice day with the
> > oscilloscope
> >> and found out: The output of the signal generator board is
already
> > bad.
> >> Then I replaced two opamps 4558 which I suspected to be the
problem
> > but
> >> it didn't help. Still 0V out instead if the signal on oszillator
2
> > (VCO
> >> 1 (sic)).
> >>
> >> Next suspect was the CMOS switch which I replaced by a similar
> > type. But
> >> Somehow it wasn't similar enough, so I got -9V in the output
now,
> > which
> >> is definitely not good.
> >>
> >> I'll keep on soldering. ;-)
> >>
> >> Best,
> >>
> >> Niels
> >>
> >>
> >> gil_we schrieb:
> >>> Did you switch SSM2056 and SSM2044 between voices to see if it
> > may
> >>> lay there ?
> >>>
> >>>
> >>> --- In PolySix@yahoogroups.com, Niels Ott <niels.ott@> wrote:
> >>>> Hello there,
> >>>>
> >>>> my Trident MK2 is defective.
> >>>>
> >>>> Symptom: VCO 1 is defective for one voice.
> >>>>
> >>>> Up to now I was able to found out: Input 1 of IC704 (4x CMOS
> >>> switch) on
> >>>> KLM-379 doesn't get the VCO signal on voice 7. On all others
it
> >>> does.
> >>>> There are some oddities with op amp IC707 but I'm not yet
sure.
> > The
> >>>> schematics and the circuit board design hint to the direction
> > that
> >>> IC707
> >>>> "feeds" IC704.
> >>>>
> >>>> The IC707 is a 4558, I assume that it is similar in the
Polysix.
> >>>>
> >>>> Did anybody of you experience a similar problem? What about
> >>> replacing
> >>>> the 4558, did this help?
> >>>>
> >>>> Furthermore, some of the 4558s carry a date stamp of 1997
which
> >>> means
> >>>> they must have been replaced by an earlier owner.
> >>>>
> >>>> Unfortunately there is no shop selling electronic parts in
reach
> > so
> >>> I
> >>>> can't just go for it and try replacing it. Mail order is an
> > option
> >>> but
> >>>> not for a few ICs...
> >>>>
> >>>> Thank you for commenting.
> >>>>
> >>>> Best,
> >>>>
> >>>> Niels
> >>>>
> >>>
> >>>
> >>>
> >>>
> >>> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> >>> Yahoo! Groups Links
> >>>
> >>>
> >>>
> >>>
> >
> >
> >
> >
> >
> > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> > Yahoo! Groups Links
> >
> >
> >
> >
>