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January 1998

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Subject:
From:
Matthew Park <[log in to unmask]>
Reply To:
TechNet Mail Forum.
Date:
Tue, 6 Jan 1998 15:41:49 -0800
Content-Type:
text/plain
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Joe,

The problem you mentioned using tin/lead board finish is
nothing new ( from what I can remember working for my
previous empolyer a long ago).  Wrinkling of boards is very
problematic in addition with non-wetting surfaces. You may
need to scrub your bare boards prior the assembly.  Get
yourself a bunch of good brushes....
Try soaking tin/lead finish bare boards in alcohol-based or
flux removing solvent.  This will remove grease and foreign
contaminants. You will see solderability improvement for
wavesoldering.
Using a more active flux is another option for that finish.
RMA flux (high solid content) or water-soluble flux will
definitely work good but need freon cleaning or washing.

regards
Matthew Park

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