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November 2001

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Subject:
Non-wetting
From:
John Brown <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 21 Nov 2001 08:54:35 +0000
Content-Type:
text/plain
Parts/Attachments:
text/plain (27 lines) 
Good Morning, this is my first posting to this forum I hope to get some
help. We are building a small PWB with 4 per panel. The problems we are
encountering are on 0603 resistors & capacitors and SOIC (8pin) etc. These
are all located near to or the center of the PWB. There is paste on the pad
and the component placed properly but the paste will not wet onto the leads
or terminations.
What have we done?
1. Run the PWB at various profiles even the highest. Still have problem.
2. Changed from no clean to aqueous with an agressive flux. Still have
problem.
3. Changed screen apertures. Still have problem.
This PWB is multi layer and heavily populated.
Are there any hints as to what we do next?

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