TECHNET Archives

November 1998

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
"Kasprzak, Bill (esd) US" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 17 Nov 1998 07:28:00 PST
Content-Type:
text/plain
Parts/Attachments:
text/plain (32 lines)
Steve:

Had a recent experience with similar results where solder appears to wet the
barrel but doesn't stay in the PTH.  I also noted that the problem was
randomin nature. Our process lab here took one of the affected boards and
microsectioned a couple of holes. What they found were, excessive nodules,
roughness and plating voids. This condition  could cause outgassing of the
laminate. It appears in your case the PTH's outgassed completely. I had some
of what you had plus some joints with the usual outgassing bubble. Thinking
initially that it was moisture, we baked the boards out. This did not help.
We manged to narrow the problem down to a board lot and we got the board fab
house to confess and replace the boards. The board house blamed the problem
on a condition called "folding" where volitiles are trapped due to drilling
problems. We did not find any evidence of this.

I think you have a "bad" lot of boards.

Bill Kasprzak
Moog Inc.

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################


ATOM RSS1 RSS2