Thanks for help.
Dave C.

-----Original Message-----
From: Collins Graham [mailto:[log in to unmask]]
Sent: Tuesday, April 15, 2003 6:33 AM
To: [log in to unmask]
Subject: Re: [TN] Neither a question, or a response...


Hi Dave
Whenever I hear of issues like this I usually go hound the test guys to
change the probes on the ICT tester.  We do a fair bit of partial wave
here, so lots of via surfaces don't get touched by the wave.  To
manually fill these would be a pain in the wallet, and I'm not getting
into screen printing paste on to vias if I can avoid it.  Thus far the
test guys have been able to get good results with different probes.

If you are going to use a conductive epoxy, is it as conductive as
copper?  I'd be worried about throwing off the test results.  E.G. my
ICT is looking for a 500k resistor, but my conductive epoxy is adding
10k to the reading - I might replace parts as being out of tolerance
when they are actually just on the edge... Just a thought.

Good luck!

regards,

Graham Collins
Process Engineer,
Northrop Grumman Canada Corporation
Halifax
(902) 873-2000 ext 6215

>>> [log in to unmask] 04/15/03 08:09AM >>>
I do have a question and would like a response offline please. I have
2000
vias on the bottomside of a wave soldered board and vias (not all) will
be
used by test. Problem is operators spend way too long inspecting to see
the
vias are filled by the wave. I want to  fill the vias with conductive
epoxy,
Methode or Dupont material. I hear it is done but can find none of our
board houses who have ever done it. Is this a fantasy? A good theory no
one
is doing? Why not? I got a response that it is "very very expensive"
what
does that mean? $1 a board more $10 a board more? And yes I have
searched
the archives. This is a high volume job I may be able to eliminate 3
shifts
worth of inspection vs. whatever the increased board cost is.

Thank you. I promise to post results to Steve's website complete with
pictures whether it works or not.
Dave Chapman
Manufacturing Engineer
Circuit Service Inc.


---------------------------------------------------
Technet Mail List provided as a free 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/html/forum.htm for
additional
information, or contact Keach Sasamori at [log in to unmask] or
847-509-9700
ext.5315
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a free 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/html/forum.htm for
additional
information, or contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a free 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/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a free 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/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------