Morning All!
 
There were a few rigid flex assemblies brought to me this morning with
some scratches in the coverlay of the flex. They are pretty minor, but
they do go down into some traces a bit. I don't think the traces are
really signal traces, but are part shielding pattern on the outside of
the flex. Check-out:
http://stevezeva.homestead.com/files/Flex_Scratch.jpg
 
My question is; is this a defect that has to be repaired, and if so what
do I use to repair the scratches with? Normally I would use soldermask
on a rigid board if the scratches doesn't reduce the trace cross-section
beyond limits, but these traces aren't signal traces, and this isn't a
rigid board.
 
I think this happened during the de-masking operation after conformal
coating...
 
Thanks!
 
-Steve Gregory-

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