Discussion about the Korg PolySix synthesizer

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
>
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> 
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