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January 2003

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Subject:
From:
"Crepeau, Phil" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 7 Jan 2003 11:43:23 -0800
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hi,

it looks like the vast majority of 'black' circles are polished ends of glass fiber.  it appears that the etch back process removed way more resin that it should have and did not remove any glass.  the observation about nail heading hits the nail on the head (pun intended).  some of the photomicrographs show inadequate copper plating in the hole.

phil

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