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24 Jun 96 09:16:47 -0400 |
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| From [log in to unmask] Mon Jun 24 08: |
57:50 1996 |
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This sounds like a good solution. One question though. Can these vias
also be used as testpoints or does the soldermask come down the hole and
interfere with the probe making contact?
Thanks,
--- Chris Stack
--- Ext. 231
--- [log in to unmask]
--- CD Electronics, Inc.
--- Printed Circuit Board Designer and Purchasing Agent
********** ORIGINAL MESSAGE FOLLOWS **********
Resent-Sender: [log in to unmask]
When vacuum fixture testing is required we encourage our customers to use
the following fix.
Soldermask phototools are created that leave an open pad area on the
solder side but tent the component side of the pcb. Our curtain coat LPI
process of course does not tent or plug the vias. However the subsequent
wave solder process will!
This has the advantage that we have no risk of chemical residues from
HASL being trapped in the via holes. We can also mass produce plugged
vias effectively without the use of dry film solder mask etc.
Our customers really like this cost effective fix and have not seen
problems with solder balls on the top side.
Richard Wood-Roe
Artetch Circuits Ltd.
Littlehampton - UK
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