[sdiy] Repairing the Serge, part 1: Cleaning flux

Jim Johnson jamos at technotoys.com
Fri Aug 23 04:46:46 CEST 2002

This all seems like good advice. I'll track that book down; looks like it
might help give me the practical edge that I need.



*********** REPLY SEPARATOR  ***********

On 8/23/02 at 9:48 AM Paul Perry wrote:

>At 12:23 PM 22/08/02 -0700, Jim wrote:
>>These boards are a rat's nest of point-to-point wiring, and both sides of
>>all boards are covered with orange crystals that I suspect are
>>flux. So my first step will be to clean this crap off, so that I can scan
>>the boards for possible reverse engineering or at least reference.
>My own preference is to touch as little as possible.
>I have never seen a schematic successfully derived from a scan.
>You just have to make sharp points for your multimeter (I solder safety
>points on) and prod away.
>>I'm planning to clean them by 1) scrubbing with a dremel tool with a
>>plastic brush; 2) dousing liberally with rosin flux remove, and 3)
>>even more liberally with distilled water. 
>Jim, it is better to measure signals while the unit is trying to work, and

>keep going until 'something strange' appears. It wouldn't hurt to have a 
>copy of "Troubleshooting Analog Circuits" by Robert Pease.
>Once you get it going, THEN you can remove flux!
>paul perry Melbourne Australia

Jim Johnson 
Metaphoric Software
Makers of Techno Toys
Software for Electronic Music
info at technotoys.com

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