Lawrence wrote in
:

I'm a flight simulator tech working on military simulators.We used to
use a visual system that would really fry certain parts of the circuit
boards. I'm talking enough crispy critters that at times we had to cut
out a hole about the size of a quarter or slightly larger and rebuild
the board. We used just regular 5-minute epoxy which we mixed in some
circuit board fibres we scrapped off old garbaged circuit boards. That
filled in the hole and by the next day everything would be good and
dry so we would use the minichine attachment of the Pace kit to
grind/sand that area flat with the board again. We would lay out the
circuit traces with more 5-minute epoxy and once that was dry we would
use "Print Kote" conformal coating to seal the new traces to the
repaired area. If there were any solder pads that we replaced with
didn't cover those over the coating. The same for where we had to
overlap traces. We would use a very small iron to solder to those
areas or we would use hot air. It all worked great and we never had
any problems. It may seem a bit of a chore to do it this way but when
you get a 10" x 10" board that is worth (supposedly) $37,000.00 then
you don't mind spending a bit of time fixing one.

Cheers,
Lawrence




I used to fill in holes from burned components(while at TEK) with
epoxy,Dremel them flat and level,drill lead holes,and then used an eyelet
kit to hold down the new traces at the solder pads.
After soldering in the new part,I would use clear nailpolish to coat the
new PCB traces if necessary.

--
Jim Yanik
jyanik
at
kua.net