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October 2000

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Subject:
From:
Brooks Bill <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 6 Oct 2000 09:07:33 -0700
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Steve... I don't know why but... those don't look like pits to me! they look
like lumps of soldermask... but I did see a feature at the bottom of
Pits2.jpg that looked like the trace edge had been compromised by etching...

Also the pads that are covered with solder look misshapen and the trace
seems to neck down into the pad... very unusual..
It's almost like somebody set the board in a rack and left etchant on the
surface to eat away at the traces after the resist was removed...? I can't
imagine how that could occur...
- Bill Brooks


-----Original Message-----
From: Stephen R. Gregory [mailto:[log in to unmask]]
Sent: Friday, October 06, 2000 8:34 AM
To: [log in to unmask]
Subject: [TN] Etched Pits in Traces...


Hi Ya'll!!

It's picture time again! Got some boards in at incoming inspection that are
really weird looking Go to:

http://www.driveway.com/share?sid=e25a88c4.8e904&name=Pictures

Look at Pits.jpg and Pits2.jpg...very, very strange! Never have seen
something like
this before...and it's only on the backside of the board? What could cause
this?

Looking in the IPC-A-600F, it only talks about reductions in conductor width
of more than 20% (for class-2), but doesn't talk about reductions in
thickness by pits such as these...it's hard to tell if they've gone all the
way through the trace because the pits are filled with solder mask and you
can't see all the way down to the bottom of the pits.

Common sense tells me that these boards are rejectable...am I right?

-Steve Gregory-

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