Appears to be isolated/propagating from the SMT lands - possible
touch-up issue?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of pearl petras
Sent: Tuesday, November 28, 2006 11:59 AM
To: [log in to unmask]
Subject: Re: [TN] More delam

This is standard FR4 with immersion silver finish.
  The standard soldermask colour we spec is clear, not green.  Allows us
to better see the copper, and often some inner layer features as well,
but if you aren't used to working with FR4 with clear soldermask, it can
definitely look a little strange, at first.
  The dark colour seen is due to an inner layer that is primarily ground
plane.
  I'm pretty sure that it isn't soldermask bubbling
  We have not yet done any microsectioning.  So far we have only seen
this on fully populated boards that have experienced some
hand-soldering, and we are reluctant to sacrifice one, if it can be
saved for production.
  I have a blank two-up panel available from each manufacturer we've
used.  We are planning to run some hand-soldering tests.  Vary
temperatures, one unbaked and one baked from each panel, etc.  Any other
ideas?


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