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April 2006

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Subject:
From:
Wayne Thayer <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Wayne Thayer <[log in to unmask]>
Date:
Thu, 20 Apr 2006 12:19:09 -0400
Content-Type:
text/plain
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text/plain (51 lines)
The pads do seem to be contaminated with something.  What was the
surface finish of the boards prior to soldering? OSP?  Immersion tin?
ENIG?

>>> [log in to unmask] 4/20/2006 11:42:01 am >>>
I received some PWB photo from my customer which they claim the
present
of "Solder Resist(Clear Color)" on the Solder Pad thus preventing the
solder from wetting. In your opinion, what's that clear color layer of
substance that is preventing it from wetting? Is it really solder
resist?
Picture:
http://img115.imageshack.us/img115/6089/untitled3or.jpg
http://img126.imageshack.us/my.php?image=untitled16ut.jpg

This PWB is coated with Green Color Solder resist,if it is really
solder
resist, shouldn't it be Green color instead of Clear? I am puzzle why
the
resist turn clear instead of Green when adhere to the solder pad. Can
someone teach me?

Sorry if you feel this is a noob question as I am new.

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