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February 2007

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Subject:
From:
"Roberts, Jon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Roberts, Jon
Date:
Thu, 22 Feb 2007 08:04:50 -0600
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Has anyone experience during rework of a multilayer board black residue
appearing around plated through holes and even under the solder mask.
Enclosed is a picture of one such incident.  Analysis said it was the result
of under cured epoxy. 

Some of my questions are:

1. Is this a reliability issue.
2. Can this be conductive is charred or burnt?
3. Is it a defect if under the solder mask and between plated through holes?
 
Thanks, Jon


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