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November 1998

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Subject:
Re: Bare Board imperfections
From:
Jim Axton <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 5 Nov 1998 07:59:27 -0800
Content-Type:
text/plain
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text/plain (48 lines) 
Hi,

It's difficult to troubleshoot without seeing the product but I'm guessing it may be streaks in the oxide. Is the area in question a copper plane? Streaking could be due to poor cleaning prior to oxide or the inner layers were stacked up against the racks used in the oxide line....

Jim

>>> Connie Korth <[log in to unmask]> 11/05 7:41 AM >>>
                Good Morning,

I don't know how to explain this, but here goes... I have a bare board with,
what appears to be, delamination but I don't think it is.(can't identify any
layer separation).  There are four spots in the board (not on surface) that
are much lighter than the rest of the board.  These areas are in line with
each other.  Someone said it looked like a 'shiner'.  Has anyone heard this
term before?  If so, what is it, what causes this condition, and is there
any document referring to the acceptability of the condition?  I looked
through the IPC-A-600, but couldn't find anything that resembled this.

From someone who's trying to learn...
ps(I'm not real familiar with bare board acceptability conditions like this
so be gentle)

Connie Korth
K-Byte Hibbing Manufacturing

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