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April 1999

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Thu, 15 Apr 1999 08:30:00 -0600
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You should be able to use either option, I would also suggest you look at one of
the clear soldermask repair products ( Chemtronics has soldermask pens in green
and clear ) since your customer objects to the appearance of the repair,
although such a small area should hardly be noticeable. Covering the copper with
solder is usually my choice if I find the exposed copper while working on a
board but for most of my assemblers soldermask repair is a safer option
especially on a ground plane where the soldermask sometimes comes off because of
the heat applied to fix the original problem!

Charles Caswell
Process  Lead
Printed Circuit Board Dept.
Frontier Electronic Systems
____________________Reply Separator____________________
Subject:    [TN] Soldermask off-rework options
Author: MIME:[log in to unmask]
Date:       4/14/99 7:54 PM

Hello all,

We are seeing some soldermask coming off the board during
assembly which exposes the copper.  The size is relatively small at
about 20-mils square, the location about 40-mils from the edge, and
located on a ground plane.  We think we know what's causing it, but my
question deals with rework.

Two options have been presented:
1)  Apply new soldermask and cure.  Seems reasonable, but the customer
doesn't like the appearance.
2)  Apply solder and clean.  There may be an issue with applying
enough heat to get good wetting and too much heat resulting in
damage, especially considering it's a ground plane.

Anyone know of a specification issue why either option can't be done?
 Any experiences, good or bad?

Thanks for all your help, today and in the past.

Glenn
[log in to unmask]
[log in to unmask]

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