Discussion about the Korg PolySix synthesizer

Thanks Stefan
I also replaced the oscilator board KLM-508 with one from my second
Poly61...No good results...
Best regards
Jos\ufffd
Portugal



----- Original Message ----- 
From: "Stefan Rinass" <st@rinass.de>
To: <PolySix@yahoogroups.com>
Sent: Tuesday, March 09, 2004 10:36 AM
Subject: Re: [PolySix] Re: Poly 61 in troubles....


> Hi Jos\ufffd
>
> I don\ufffdt know the Poly-61 and how he is organzied, but maybe the
> "PS61"-Messsage is not generated by the CPU Chip, so -maybe- the CPU
> itself doesn\ufffdt work cause of a bad connected (overall defect/missing
> "ground-line") main Oscillator (which feeds the main CPU)
>
> Pure speculations.
>
> Greetings
>
> Stef
>
>
> Jos\ufffd Pereira wrote:
>
> >Hi Gil
> >Yes, I did.
> >The CPU chips are assembled in sockets. I even replaced the chips...
> >Thanks and best regards
> >Jos\ufffd
> >Portugal
> >
> >----- Original Message ----- 
> >From: "gil_we" <gil_we@yahoo.com>
> >To: <PolySix@yahoogroups.com>
> >Sent: Monday, March 08, 2004 8:45 PM
> >Subject: [PolySix] Re: Poly 61 in troubles....
> >
> >
> >I don't know the P61 but does it have sockets for ICs ?
> >If so have you tried to tighten them in their places ?
> >
> >
> >
> >--- In PolySix@yahoogroups.com, Jos\ufffd Pereira
> ><jose.gouveia.pereira@n...> wrote:
> >
> >
> >>Hi Johannes
> >>1) I checked the power supply: 14,99 VDC, -15,03 VDC and 5,04 VDC
> >>2) I don't know what is the Reset circuit. When I "ground" the
> >>
> >>
> >RESET pin on
> >
> >
> >>IC30 the poly61 display clears and return to the "usual" PS61
> >>
> >>
> >message.
> >
> >
> >>3) How can I check the CPU activity at pin 11 of IC30?
> >>4) Rechecked all PCB traces around NiCd battery and everything
> >>
> >>
> >seems OK...
> >
> >
> >>5) I checked the voltage levels at IC30 and IC1. Both have 4,98 VDC
> >>
> >>
> >although
> >
> >
> >>the voltage at the entrance of the board is 4,98 VDC. Remaining IC
> >>
> >>
> >in the
> >
> >
> >>CPU board have 4,99 VDC. Are these deferences significant?
> >>
> >>In my schematics there's nothing striked or changed.
> >>
> >>Thanks for your incoming suggestions.
> >>Best regards
> >>Jos\ufffd
> >>Portugal
> >>
> >>
> >>----- Original Message ----- 
> >>From: "Johannes Hausensteiner" <jo.synth@c...>
> >>To: <PolySix@yahoogroups.com>
> >>Sent: Wednesday, February 25, 2004 7:51 PM
> >>Subject: Re: [PolySix] Poly 61 in troubles....
> >>
> >>
> >>
> >>
> >>>Hi,
> >>>
> >>>The CPU board is a safe bet ...
> >>>I would check the following (in this order):
> >>>1) Power supply. There is an adjustment/check procedure given in
> >>>
> >>>
> >the
> >
> >
> >>>    service manual. Do this.
> >>>2) Reset circuit of IC30.
> >>>3) CPU activity e.g. on ALE (pin11 of IC30).
> >>>4) Continuity of PCB traces around the NiCd battery. Electrically
> >>>
> >>>
> >+
> >
> >
> >>>    optically. I bet that they used the same brand and make as in
> >>>
> >>>
> >the
> >
> >
> >>>    Polysix...
> >>>5) Check for good voltage levels on CPU data/port lines (ca. 0V /
> >>>    ca +5V, nothing in between).
> >>>
> >>>In my copy of the schematics there are a few components around the
> >>>RST circuitry changed or eliminated manually. Do you have this?
> >>>(R145, D12, C53 (or is it C55, C33 ? - cannot read it...) are
> >>>
> >>>
> >striked
> >
> >
> >>>through; R146 is 2K2)
> >>>
> >>>Do you have access to an oscilloscope?
> >>>Where are you located?
> >>>
> >>>Good luck,
> >>>
> >>>Johannes
> >>>
> >>>
> >>>
> >>>Jos\ufffd Pereira wrote:
> >>>
> >>>
> >>>>Hi
> >>>>I know it's the polysix group but there's  a lot of tech people
> >>>>
> >>>>
> >around
> >
> >
> >>who
> >>
> >>
> >>>>could possible give me some clues...
> >>>>My Poly 61 at start up freezes with the initial message "PS 61"
> >>>>
> >>>>
> >in the
> >
> >
> >>>>display.
> >>>>I replaced the internal battery, but the malfunction continues.
> >>>>I replaced all the boards with one other damaged Poly 61,
> >>>>
> >>>>
> >except the CPU
> >
> >
> >>>>board.
> >>>>I also replaced the 2 chips CPU IC - 8049 from other CPU board.
> >>>>Can't replace the CPU board because the other one I have is
> >>>>
> >>>>
> >corroded by
> >
> >
> >>a
> >>
> >>
> >>>>leaking battery...
> >>>>This take me to conclude for a damaged CPU board (KLM 509 - new
> >>>>
> >>>>
> >>production).
> >>
> >>
> >>>>Am I wrong?
> >>>>Does anybody have any suggestion?
> >>>>Do you have one of those in stock (KLM 509)?
> >>>>Let me know, please.
> >>>>Thanks and best regards.
> >>>>Jos\ufffd
> >>>>portugal
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>----- Original Message ----- 
> >>>>From: "dotwav" <rob19@e...>
> >>>>To: <PolySix@yahoogroups.com>
> >>>>Sent: Monday, February 23, 2004 3:16 PM
> >>>>Subject: [PolySix] Warming up time....(and a service)
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>>Hello again all...
> >>>>>
> >>>>>Finally got a SSM2056 chip for my P6 which fixed the annoying
> >>>>>
> >>>>>
> >6th
> >
> >
> >>>>>note enigma I was having, it's good to hear all notes play
> >>>>>
> >>>>>
> >normally
> >
> >
> >>>>>now.
> >>>>>That said, once I got going, I noticed that little response was
> >>>>>
> >>>>>
> >had,
> >
> >
> >>>>>from altering most of the knobs (the VCO section, is the only
> >>>>
> >>>>
> >thing
> >
> >
> >>>>>that made any difference). Playing about through all the
> >>>>>
> >>>>>
> >patches, I
> >
> >
> >>>>>got very little change (hardly any) when altering the FILTER,
> >>>>>
> >>>>>
> >EG or
> >
> >
> >>>>>MG sections.
> >>>>>Wondering what had changed, I put the faulty SSM2056 back in,
> >>>>>
> >>>>>
> >but
> >
> >
> >>>>>the same thing happened.New chip back in........
> >>>>>
> >>>>>I then wthought,  did it need warming up? so I left it fo 20
> >>>>>
> >>>>>
> >mins,
> >
> >
> >>>>>but no change, however, this morning, I went out, and switched
> >>>>>
> >>>>>
> >it
> >
> >
> >>>>>on, come back 5 hours later, and it's warmed up, the cutoff knob
> >>>>>works well enough, the resonance does work (but I don't think
> >>>>>fully), most other knobs work (though some don't seem to do
> >>>>>anything, some of the time - I think maybe the way a current
> >>>>>
> >>>>>
> >patch
> >
> >
> >>>>>is setup, that particular knob changes don't make any
> >>>>>
> >>>>>
> >difference)..
> >
> >
> >>>>>Two thoughts, how long should it take to warm up, how long does
> >>>>>yours take.....?   Does this need a service, can it
> >>>>>
> >>>>>
> >be "calibrated"
> >
> >
> >>>>>so that it works much better, or should I expect this from now
> >>>>>
> >>>>>
> >on.
> >
> >
> >>>>>(I've tried pulling all the IC's that I can, and re-seating
> >>>>>
> >>>>>
> >them)
> >
> >
> >>>>>Last thing, any recommendations for a UK service/repair man.
> >>>>>
> >>>>>
> >Tony
> >
> >
> >>>>>Allgood has said he's too busy at the moment, I looked at music
> >>>>>control website, which diverted me to cimplesolutions, who told
> >>>>>
> >>>>>
> >me
> >
> >
> >>>>>they don't repair classics like the P6, the only other one I
> >>>>>
> >>>>>
> >thought
> >
> >
> >>>>>of was synth-restore, but I emailed them 3 weeks ago, and
> >>>>>
> >>>>>
> >didn't get
> >
> >
> >>>>>a reply. I have seen old crows web site, with a guide on how to
> >>>>>
> >>>>>
> >do
> >
> >
> >>>>>the job, but I don't own an oscilloscope, and I don't want to
> >>>>>
> >>>>>
> >make
> >
> >
> >>>>>it any worse, so would prefer putting it in the hands of
> >>>>>
> >>>>>
> >someone who
> >
> >
> >>>>>knows what theyre doing.
> >>>>>
> >>>>>Thanks for your previous help..
> >>>>>cross modulated  Rob
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>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
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>
> >>>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
> >
> >
> >
> >
> >
> >
> >
> >
> >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
>
>
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