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
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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