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January 1997

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Subject:
re: Exposed circuits
From:
<[log in to unmask]> (James Kenny)
Date:
Fri, 3 Jan 97 6:38:46 PST
Content-Type:
text/plain
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Todd,

Havce you done cross sections of the soldermask coverage? Perhaps the spray 
coater is not depositing a uniform coat and thin areas are being attacked.

[log in to unmask]




"Todd Rogers" <[log in to unmask]> Wrote:
| 
| Technetters,
| We have been experiencing some sporadic problems with 
| soldermask being
| burned off the edge of the circuits at the hot air level 
| process.  The
| soldermask on the knee of the trace seems to burn off and 
| allows the solder
| to stick to the trace edge.  We are using a chemical clean 
| process prior to
| soldermask, and are spraying the soldermask on with a 
| Teledyne spray
| coater.  Has anyone else experienced these problems and 
| what did you do to
| fix it?
| 
| Todd Rogers
| PC Boards, Inc.
| [log in to unmask]
| 
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