Vintage Synth Repair

Well I played with it some more and it seems that when in "poly mode"

voices two and three in DCO1 play (with increasing pitch)while the

others are only audible with the square wave. DCO2 plays all voices3;
fine but 2&3. 
So it's confused by 2&3. But why?
--- In vintagesynthrepair@yahoogroups.com, "plastikanimal"
<plasticanimal1@...> wrote:
>
> Thanks Brian! I will check into it.
--- In
vintagesynthrepair@yahoogroups.com, "Brian Davies"
<brian@>
wrote:
>
> You need to neutralize
the acid , the chemical I use is bicarbonate
of&#13;
soda,
> a teaspoonful in a glass of warm water will work. 
Then rinse with warm
> water, dry thoroughly before powering
up.
>  
> 73
> Brian G3OYU
0;>
www.g3oyu.co.uk
> www.surreyraynet.net
> 3;

>   _____  
> 
> From:
vintagesynthrepair@yahoogroups.com
>
[mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of
plastikanimal
> Sent: Wednesday, 04 June 2008
18:46
> To: vintagesynthrepair@yahoogroups.com
>
Subject: [vintagesynthrepair] Re: Korg POLY-61 pitch drift
problem
>  
> I used soap and water on the cpu
board. The voice board didn't seem
> to
&#10;have any
acid on it except in one spot where the acid
seemed
to
> move
along the "jumper ribbon". I cleaned that
with a
Q-tip,soap
> and water.
&#10;It ended up
eating traces for a couple of
capacitors and
> a
transistor.
The "high" and "bend" adjustments are
just
below this
> spot so maybe
0;it's gotten
to them as well.
--- In
> vintagesynthrepair@
<mailto:vintagesynthrepair%40yahoogroups.com>
;>
yahoogroups.com, "Brian Davies"
>
<brian@>3;
wrote:
>
> How did you clean off
the

> battery acid?
> 
> Regards
>
Brian
> G3OYU
> www.g3oyu.co.uk
>

0;> _____

>
> 
> From:
vintagesynthrepair@
>
<mailto:vintagesynthrepair%40yahoogroups.com>
yahoogroups.com
>
>
[mailto:vintagesynthrepair@
<mailto:vintagesynthrepair%40yahoogroups.com>
&#10;>
yahoogroups.com] On Behalf Of plastikanimal
>
&#10;Sent:
Wednesday, 04
> June 2008 08:26
> To:&#13;
vintagesynthrepair@
>
<mailto:vintagesynthrepair%40yahoogroups.com>
yahoogroups.com
>
> Subject: [vintagesynthrepair]
Korg POLY-61 pitch drift
problem
;
>
>

> Hi, I'm trying to repair a POLY-61 for a friend. I
have
> very
> little
experience at this.(I
replaced the
battery
> in mine so he
>
thinks I'm
a
genius).
&#10;Anyway, I
>
replaced his
battery,but
;> some of the ni-cad
acid
found
> it's
;way across to the
voice
board. I
>
had to
> replace
a transistor and some
other
&#10;things.
I
thought I
> had
> it
&#10;right, but after a few minutes voice
2 and 3
> begin&#13;
to
drift up
> in pitch to no end. I
don't
know if I
> used
the wrong
parts
;
or if
> something
else is
>
wrong.

Any ideas?
> 
>

>
> 
> 
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