Discussion about the Korg PolySix synthesizer

--- 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 they must have been replaced by an earlier owner.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
>

> 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 they must have been replaced by an earlier owner.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
>
>
>
>

> 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
>
>
>
>

--- 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
> >
> >
> >
> >
>

> 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.
>>

> 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
>
>

> > not for a few ICs...
> >
> > Thank you for commenting.
> >
> > Best,
> >
> > Niels
> >
> >
>

> >> costs. (Outside the EU is not such a good idea because of customs
> > etc.)
> >> Payment could be done via PayPal or bank transaction.
> >>
> >> Best,
> >>
> >> Niels
> >>
> >> Niels Ott schrieb:
> >>> 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
> >
> >
> >
> >
>

> Still for sale...
>
>
>
> nanomole39 schrieb:
>> hi there is the trident still for sale as im very interested.i am in
>> the uk
>>
>> regards
>>
>> ady
>> -
>>
>> -- In PolySix@yahoogroups.com, Niels Ott <niels.ott@...> wrote:
>>> Hi again,
>>>
>>> I found that I just don't find the time any soon to fix my Trident
>> MK2.
>>> Defects as described below. I won't find much time before August or
>> even
>>> later and I'm low of cash and my cheap studio monitors are
>> signaling the
>>> end of there life...
>>>
>>> So in case anybody is interested in buying it, please make offers
>> in ¤
>>> off-list.
>>>
>>> My offer includes:
>>>
>>> - Korg Trident MK2 with defect named below, plus a scratch on the
>>> wooden side. Besides that in good condition!
>>> - Battery has been replaced
>>> - Joystick has been replaced by other part
>>> - 2x SSM 2044 NEW! but old stock
>>> - 1x SSM SSM2056 used
>>> - 2x 4066 quad CMOS switch
>>> - 5x 4558 dual OpAmp
>>> - Printouts of data sheets for all ICs named above.
>>> - Printed service manual on A3 as available online
>>> (however, not perfect quality)
>>> - Custom made transport case in mint condition!!!
>>> (wooden flight case with aluminum edges)
>>>
>>> Sooner or later I'll put it on Ebay for a fixed price but I'd be
>> happy
>>> to avoid this extra work and just sell to some enthusiast here on
>> he list.
>>> I will arrange shipping within the EU, however I need to figure out
>>> costs. (Outside the EU is not such a good idea because of customs
>> etc.)
>>> Payment could be done via PayPal or bank transaction.
>>>
>>> Best,
>>>
>>> Niels
>>>
>>> Niels Ott schrieb:
>>>> 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
>
>
>
>

> 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 - Join or create groups, clubs, forums & communities. Links
>
>
>
>