Discussion about the Korg PolySix synthesizer

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, José 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
> José
> 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
> >
> >
> >
> > José 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.
> > > José
> > > 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
> >
> >
> >
> >
> >
> >
> >