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June 2010

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Subject:
From:
David Hoover <[log in to unmask]>
Reply To:
David Hoover <[log in to unmask]>
Date:
Thu, 17 Jun 2010 16:41:49 -0700
Content-Type:
text/plain
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text/plain (107 lines)
I must have missed this email string.
What's all that silliness with copper at the via top along with what appears 
to be debris?
Was this a shallow drilled or plugged hole?

What caused that cross section to look that way?

Dave Hoover
San Jose, CA

----- Original Message ----- 
From: "Chuck Brummer" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, June 17, 2010 3:29 PM
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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