Discussion about the Korg PolySix synthesizer

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
>
>
>----------
>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]