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Date: | Fri, 18 Jun 2010 11:16:16 -0700 |
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Ian,
You're reading my mind on this one...
Dave Hoover (aka, Groovy Hoovy)
----- Original Message -----
From: "Ian Hanna" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, June 18, 2010 11:04 AM
Subject: Re: [TN] Thursday Quiz
This did not separate during thermals the edges are too smooth -- it was
fabbed that way. Hard to tell if electrolytic or electroless voiding
from the condition on the section -- but if electrolytic would be caused
by debris and not a bubble as the tin overplate is also missing...a
little to even for an etch void and the shape looks a little 'flat' for
an air bubble...maybe a little bit of resist residue...
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chuck Brummer
Sent: Thursday, June 17, 2010 6:29 PM
To: [log in to unmask]
Subject: Re: [TN] Thursday Quiz
A ring void. Maybe no electroless but probably separated during a
thermal excursion. Has it been soldered? If so the Z axis expansion
can
cause this failure if not it was never plated.
Chuck Brummer
3M Manufacturing Engineer
8357 Canoga Ave.
Canoga Park, CA 91304-2605
(818) 734-4930
From:
Al Onderick <[log in to unmask]>
To:
[log in to unmask]
Date:
06/17/2010 02:04 PM
Subject:
[TN] Thursday Quiz
Sent by:
TechNet <[log in to unmask]>
What causes this ?
http://www.austinwoodsandwaters.com/open-via.jpg
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