Discussion about the Korg PolySix synthesizer

Hello All!!!

I recently purchased a P6 and mine was close to dead, wierd sounds 
and blinky lights, well I decided to head out to the electronic shop 
and try the battery replacement project, since my battery had leaked 
and affected several IC's so I took those out, and the battery also, 
did a pretty good job of cleaning it out and resoldering it back. I 
happen to find at the electronics store a barrel drum type battery of 
the same voltage, so I decided not to go with the lithium upgrade, 
and I replaced the battery and bought 2 IC holders, WHALLA, I was 
done none of the traces were bad and all traces and contacts were 
verified. according to old crows website if after this procedure the 
CPU may be bad. well it looks that way .......... I get the same 
wierd distorted sounds as before. can anyone help?

it's "voila", you eejit - a French word - not "whalla" 

LOL :-)

----- Original Message ----- 

From: "zephross" <hec_is@hotmail.com>
To: <PolySix@yahoogroups.com>
Sent: Tuesday, April 27, 2004 6:11 PM
Subject: [PolySix] some help please


> Hello All!!!
> 
> I recently purchased a P6 and mine was close to dead, wierd sounds 
> and blinky lights, well I decided to head out to the electronic shop 
> and try the battery replacement project, since my battery had leaked 
> and affected several IC's so I took those out, and the battery also, 
> did a pretty good job of cleaning it out and resoldering it back. I 
> happen to find at the electronics store a barrel drum type battery of 
> the same voltage, so I decided not to go with the lithium upgrade, 
> and I replaced the battery and bought 2 IC holders, WHALLA, I was 
> done none of the traces were bad and all traces and contacts were 
> verified. according to old crows website if after this procedure the 
> CPU may be bad. well it looks that way .......... I get the same 
> wierd distorted sounds as before. can anyone help?
> 
> 
> 
> 
> 
> 
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6 
> Yahoo! Groups Links
> 
> 
> 
>  
>

Hello-
I've repaired a number of battery-damaged P6 boards, and I would first 
question your statement that "all traces & contacts are verified".
It only requires one data or address trace to be incomplete or shorted to 
another trace, and/or only one connector trace to be broken or shorted to 
cause the kind of problem you describe.
Do you have a scope?  It's helpful to view all the lines (clock, data, 
address, etc) from the CPU  - -

But the standard method is to use a continuity tester to verify every 
single trace (using the schematic for comparison), beginning with the lines 
from CPU to ICs 31 & 30, then to 26 & 24 to the RAM chip (and don't forget 
23 & 25), looking for continuity & shorts.

Another thing to look for, when ICs have been replaced, is broken or 
shorted traces underneath the new sockets.

It's a long & painstaking process;  but it always pans out, in the 
end;  I've always been able to eventually get the board back to full 
working condition, and I've never seen a dead CPU (so far)  (fingers crossed).

~GMM

At 05:11 PM 4/27/04 +0000, you wrote:
>Hello All!!!
>
>I recently purchased a P6 and mine was close to dead, wierd sounds
>and blinky lights, well I decided to head out to the electronic shop
>and try the battery replacement project, since my battery had leaked
>and affected several IC's so I took those out, and the battery also,
>did a pretty good job of cleaning it out and resoldering it back. I
>happen to find at the electronics store a barrel drum type battery of
>the same voltage, so I decided not to go with the lithium upgrade,
>and I replaced the battery and bought 2 IC holders, WHALLA, I was
>done none of the traces were bad and all traces and contacts were
>verified. according to old crows website if after this procedure the
>CPU may be bad. well it looks that way .......... I get the same
>wierd distorted sounds as before. can anyone help?
>
>
>
>
>
>PolySix "Digiest" Page: 
><http://www.acc.umu.se/~amber/Poly6>http://www.acc.umu.se/~amber/Poly6
>
>
>Yahoo! Groups Sponsor
>ADVERTISEMENT
>
>
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>    * To visit your group on the web, go to:
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[Non-text portions of this message have been removed]

As GMM said, you may still have bad part/traced there...

I would socket all ICs near the battery area and replace them,
as well as wiring the traces.

There will be parts that visually look OK to you but are actually bad.
The acid just gets anywhere.

I've done that repair on my Kawai SX-210 and helped a friend on his 
P6 and in both cases it was not simple but definately worth the 
effort.

--- In PolySix@yahoogroups.com, greg montalbano 
<greg.montalbano@u...> wrote:
> Hello-
> I've repaired a number of battery-damaged P6 boards, and I would 
first 
> question your statement that "all traces & contacts are verified".
> It only requires one data or address trace to be incomplete or 
shorted to 
> another trace, and/or only one connector trace to be broken or 
shorted to 
> cause the kind of problem you describe.
> Do you have a scope?  It's helpful to view all the lines (clock, 
data, 
> address, etc) from the CPU  - -
> 
> But the standard method is to use a continuity tester to verify 
every 
> single trace (using the schematic for comparison), beginning with 
the lines 
> from CPU to ICs 31 & 30, then to 26 & 24 to the RAM chip (and don't 
forget 
> 23 & 25), looking for continuity & shorts.
> 
> Another thing to look for, when ICs have been replaced, is broken 
or 
> shorted traces underneath the new sockets.
> 
> It's a long & painstaking process;  but it always pans out, in the 
> end;  I've always been able to eventually get the board back to 
full 
> working condition, and I've never seen a dead CPU (so far)  
(fingers crossed).
> 
> ~GMM
> 
> At 05:11 PM 4/27/04 +0000, you wrote:
> >Hello All!!!
> >
> >I recently purchased a P6 and mine was close to dead, wierd sounds
> >and blinky lights, well I decided to head out to the electronic 
shop
> >and try the battery replacement project, since my battery had 
leaked
> >and affected several IC's so I took those out, and the battery 
also,
> >did a pretty good job of cleaning it out and resoldering it back. I
> >happen to find at the electronics store a barrel drum type battery 
of
> >the same voltage, so I decided not to go with the lithium upgrade,
> >and I replaced the battery and bought 2 IC holders, WHALLA, I was
> >done none of the traces were bad and all traces and contacts were
> >verified. according to old crows website if after this procedure 
the
> >CPU may be bad. well it looks that way .......... I get the same
> >wierd distorted sounds as before. can anyone help?
> >
> >
> >
> >
> >
> >PolySix "Digiest" Page: 
> 
><http://www.acc.umu.se/~amber/Poly6>http://www.acc.umu.se/~amber/Poly
6
> >
> >
> >Yahoo! Groups Sponsor
> >ADVERTISEMENT
> >
> >
> >----------
> >Yahoo! Groups Links
> >    * To visit your group on the web, go to:
> >    * 
> > 
<http://groups.yahoo.com/group/PolySix/>http://groups.yahoo.com/group/
PolySix/
> >    *
> >    * To unsubscribe from this group, send an email to:
> >    * 
> > <mailto:PolySix-unsubscribe@yahoogroups.com?
subject=Unsubscribe>PolySix-unsubscribe@yahoogroups.com 

> >
> >    *
> >    * Your use of Yahoo! Groups is subject to the 
> > <http://docs.yahoo.com/info/terms/>Yahoo! Terms of Service.
> 
> 
> [Non-text portions of this message have been removed]