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Cleaning degraded foam off a circuit board
I've got an old Moog Opus 3 that I opened up to clean pots. The
protective foam seems to be reverting to the petroleum from whence it came. I pulled off the big pieces that were still intact and scrapped off as much as I could but there's still sticky, gooey black gunk all over the pots and on the circuit board. Is there a good way to clean this stuff off? Is there any truth to idea that the foam becomes conductive as it degrades and ends up causing problems wit the circuitry? What solvents would be safe to use on the board? Thanks, Andy |
#2
Posted to rec.audio.pro
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Cleaning degraded foam off a circuit board
apa wrote:
I've got an old Moog Opus 3 that I opened up to clean pots. The protective foam seems to be reverting to the petroleum from whence it came. I pulled off the big pieces that were still intact and scrapped off as much as I could but there's still sticky, gooey black gunk all over the pots and on the circuit board. Is there a good way to clean this stuff off? Is there any truth to idea that the foam becomes conductive as it degrades and ends up causing problems wit the circuitry? What solvents would be safe to use on the board? The urethane, when it breaks down, absorbs moisture from the air. The end result is a tiny little bit conductive. Not very conductive, but conductive enough to totally screw up high-Z condenser microphone circuits. Try cleaning it off with Goo-Gone or Ronsonol, then using some alcohol to get the solvent off. Flux remover will take it off too, but it's harder to work with. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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