Discussion about the Korg PolySix synthesizer

Hi Johannes
Thanks for your kind answer.
1) I checked the power supply and the voltages are Ok. 15VDC, -15VDC and 5
VDC.
2) I'll do that, though when I ground pin 4 (reset) on both CPU ICs seems
like the POLY 61 initializes.
3) I'll also do that.
4) I checked PCb traces carefully both electrically and visual. Everything
seems OK. There's no great damage from the leaking battery. I also
resoldered some points in the PCB specially on connectors and resistors,
which seemed less trustable.
5) I'll do that.

I have to check the diagrams to look for the changings you refer.
I don't have an osciloscope but I think I can get one borrowed.
I'm located near Lisbon.

Best regards
Jos\ufffd
portugal


----- Original Message ----- 
From: "Johannes Hausensteiner" <jo.synth@crossnet.at>
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@eggconnect.net>
> > 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
>
>
>
>
>
>
>