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@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
>>
>>
>>
>>
>>
>>
>>
>
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>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
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>