Discussion about the Korg PolySix synthesizer

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 they must have been replaced by an earlier owner.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

> > 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
> 
> 
> 
>

> > 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
> > 
> >
>

> 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 \ufffd
>> 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
>
>
>
>

> >> 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 \ufffd
>>> 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
> 
> 
> 
>