I recently repaired a battery-leaked Polysix, where the acid had crawled
via the GND wire to the control panel and damaged the analog mux ICs
(4051) there! So be very thorough when cleaning and repairing PCB
traces...
Johannes
drfuzz@aol.com wrote:
> I would suggest going back and checking the traces and chips again.? The acid damage can be subtle, and cover a wider area than you would think.? It is also best to actually remove any damaged traces, not just jumper past them.
>
> Drfuzz
>
>
> -----Original Message-----
> From: spistrich <wasteking@verizon.net>
> To: PolySix@yahoogroups.com
> Sent: Thu, 8 Nov 2007 8:21 am
> Subject: [PolySix] polysix bat tery leak issues
>
>
> i did a battery transplant and a little trace repair a few months ago
> and my Polysix was fine, but it had this 'slow warmup' when 2 of the
> program LEDs would stay lit and the 'write' LED for 30 seconds then
> flash and go off at which point everything was fine....now, months
> later, the 'warmup ' period is a few minutes, and the keyboard goes in
> and out of having the 'write, and program #6 LEDs' on ...when these
> LEDs are on, on the unit plays an odd 'mixed ' sound like there are
> competing patches. since it is now worse i was supposing that maybe
> that battery acid has worked its way in somewhere. I was wondering if
> anyone knew which specific contact points controlled those 2 LEDs...are
> they on IC 31?, this chip had the corrosion and is where i had to do
> some splicing repair of traces. It would be handy to know if there was
> a specific point that controled these things... ALSO...when working
> correctly,i tried to download the sounds onto cassette, hitting the
> tape loading button, the unit would not load and the #6 LED would go on
> again, even if it was fine before the attempted loading. and would take
> a while to go back into normal with only one program #LED lit. I have
> schematics, but I am wondering if anyone has specific pin
> identification info that could help. The unit is now inconsistant.
>
>
>
>
>
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