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Thu, 25 Jul 1996 17:18:17 -0400 |
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55:28 1996 |
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We are experiencing a type of contamination on completed board
assemblies (we don't have access to bare boards). Under microscopic
inspection, some surface mount parts have a brown "gun powder" like
substance appearing on part of the solder joint. Scrubbing with a solvent is
required to remove it.
1) Has anyone experienced this?
2) What could it be - and what could be the root cause?
2) Is it something we should worry about?
3) Is there a cure?
Possibly related- all boards with this defect also have a number of traces
which appear to be over etched.
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