I dont know if this is going to help U... Still....
I simply ask designer to use 0,8 mm (0,6-1,0) diameter vias that are used to access the nets and are going to be used by ICT. The rest of the vias are 0,5 or less and covered with soldermask...
The only problem U might get is that the vacuum in ICT equipment is to weak to suck the PCB in the fixture because there are new openings in the PCB, but this is nothing unsolvable...
Good Luck!
Sasha
*************************************************************************
Sasha Miladinovic - Production Engineering
Amersham Biosciences, PCB Production, Umeå
Tel: +46 (0) 90 150 232
Fax: +46 (0) 90 138 372
E-mail: [log in to unmask]
*************************************************************************
2003-04-15 13:09
Please respond to "TechNet E-Mail Forum."; Please respond to Dave Chapman
To: [log in to unmask] cc:
Subject: Re: [TN] Neither a question, or a response...
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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