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Tue, 15 Apr 2003 07:32:48 -0400 |
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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.
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