If you had some visible corrosion it is very possible that there is/was
more hidden elsewhere that you missed. Or that got worse over time. That
stuff is insidious.
I would suggest doing a lot of continuity checking to rule that or a short
out as the culprit. Perhaps some other folks can chime in on where to
start.
jed
On Thu, Sep 20, 2012 at 7:59 AM, Jw W <arpomni@yahoo.com> wrote:
> ∗∗
>
>
> Thanks, but your LFO LED link is a dead one, and the problem we have is on
> the programming display LED's
>
> Question to the smart guys on here: Why is the subosc and the octave
> switch messed, as well as the programming section? I'm thinking CPU or
> Memory Chip 32?
>
> I pulled the board out. Power supply output is perfect. Replaced IC 30 and
> 31. Replaced the 40 pin socket for the CPU. Checked all of my traces for
> continuity as per Old Crow's site. I replaced the battery a couple years
> back and had a little corrosion, so the traces are fine on my board. I put
> it all back together and now have LED #5 stuck on now along with
> Found/Manual LED is also stuck on. My next step will be to replace IC32
> with one on order, not easy to find that old memory chip! Hopefully this
> will be the fix. If not I will be ordering a new CPU chip from ?? Vintage
> Planet?? I guess. Any one have any other ideas or advice? I cannot believe
> how sad a broken Polysix makes me. It is a sweet machine.
>
> John
>
>
>
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