Vintage Synth Repair

You need to neutralize the acid , the chemical I use is bicarbonate of soda,
a teaspoonful in a glass of warm water will work.  Then rinse with warm
water, dry thoroughly before powering up.
 
73
Brian G3OYU
www.g3oyu.co.uk
www.surreyraynet.net
 
  _____  

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
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.
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
it's gotten to them as well.
--- In
vintagesynthrepair@ <mailto:vintagesynthrepair%40yahoogroups.com>
yahoogroups.com, "Brian Davies"
<brian@...>
wrote:
>
> How did you clean off the
battery acid?
> 
> Regards
> Brian
G3OYU
> www.g3oyu.co.uk
> 
> _____ 
>

> From: vintagesynthrepair@
<mailto:vintagesynthrepair%40yahoogroups.com> yahoogroups.com
>
[mailto:vintagesynthrepair@ <mailto:vintagesynthrepair%40yahoogroups.com>
yahoogroups.com] On Behalf Of plastikanimal
> Sent: Wednesday, 04
June 2008 08:26
> To: 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).
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 things. I
thought I
had
> it right, but after a few minutes voice
2 and 3
begin 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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