Subject: | |
From: | |
Reply To: | TechNet E-Mail Forum. |
Date: | Fri, 12 Dec 2003 08:56:16 -0500 |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
Hey guys,
I have be hit recently on a couple of occasions by the quality folks
over "foreign material" that is present on CCA's after conformal coating.
On quite a few boards we install heat sinks after CC and usually use an
epoxy to aid in heat transfer as well as loctite on the mounting screws. I
have been gigged for the residuals (just smears really) whether it is on
the solder pads or not. I know that we all are concerned with material
left over directly on the solder connections, but I am having trouble with
this one from a logical standpoint. I mean lets face it, you definitely
can't test for the presence of ionic contaminants or anything, but I know
the general impression is the boards should be clean.
I know the simple answer here is to clean up all the residuals (and
everyone is instructed to do that), but there are times when stuff just
happens.
Your thoughts
Bruce Stilmack
GDLS-TO Manufacturing Engineer
(850) 574-4773
[log in to unmask]
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------
|
|
|