[sdiy] de-potting

[Harry Bissell]

In my case it was a non-working unit to sacrifice. I bought the PCBs used
(excellent condition) for quite a high price, then noticed on delivery that
all the IC's and 'capacitors' has been replaced. This is a sure sign of

1) trouble
2) less than competent repair skills

It appears that power was reversed to the unit, killing all including the potted
module.

otoh, I wanted to see how well it worked, and I got to find out ~how~ it worked
at the same time. Less $$$ than a college course, and I got to sell the now-working
unit and get my "tuition" back.

Has it ~not~ been broken, I would have feared that sledgehammer approach :^)

H^) harry

----- Original Message -----
From: Colin f <colin at colinfraser.com>
To: 'Synth-DIY' <synth-diy at dropmix.xs4all.nl>
Sent: Mon, 20 Sep 2010 09:14:13 -0400 (EDT)
Subject: Re: [sdiy] de-potting

 

> I did my Gentle Electric potted module with a hammer and 
> screwdriver. OTOH I was able to discern the circuit from the 
> exposed PCB and did not need to remove ~all~ the epoxy
> 
> H^) harry  

That's an approach I've been considering with some potted modules I have
here.
If I just expose the PCB foil, identify every component leg, then isolate
each leg by cutting tracks, a combination of LCR meter and Atlas component
analyser might get me a good part of the way through RE-ing the ciruit
before I need to uncover any component bodies.
This approach does require a working circuit to be sacrificed.

Cheers,
Colin f


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-- 
Harry Bissell & Nora Abdullah 4eva