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Date: | Mon, 1 Oct 2007 19:11:50 +0200 |
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Broken glass fibers caused by poor tooling parameters is my first thought.
The loss of fibers leaves a small cavity that will be filled by Copper,
sometimes even by solder. I assume, that the preparation is correctly done,
so we can exclude smear.
I think you can sleep tonight, this failure can be easily fixed with a fresh
diamond tool in your Excellon.
If you use laser drilling, the above is not valid.
Inge
-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Jack Olson
Skickat: den 1 oktober 2007 18:56
Till: [log in to unmask]
Ämne: [TN] Is This a BAD Thing?
I'm not accustomed to looking at reliability issues,
(my designs are usually so perfect... (grin))
so every time I see an X-Ray or a cross-section
I get nervous wondering what I'm actually seeing.
Can anyone explain what the following picture means?
http://www.frontdoor.biz/PCBportal/208what.jpg
onward thru the fog,
Jack
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