From looking at the x-section it appears that the trace is a
Power/Ground, 1 oz Cu.   Most signals are typically 1/2 oz Cu.   How
many layers does the PCB have?

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Thursday, February 07, 2008 11:32 AM
To: [log in to unmask]
Subject: Re: [TN] FAB: Thin Trace Failures

By recommending furthur polishing, are you saying it would be helpful to
know if the void is circular? So if the void gradually goes away it
means we
might have just hit it  in the "fat" part, but there might really be
enough
copper to consider it a good trace? I'm not so familiar with these type
of
conditions, but several responses seemed to indicate that this might be
okay, but we have over 50% assemblies failing final test when we heat
them
up. (which is not okay)

Jack


On 2/7/08, Igoshev, Vladimir <[log in to unmask]> wrote:
>
> I have (at least something similar). Try to polish it a bit more and
it
> will either go away. Or become a "complete" trace (depending on how
> deep-in it has been already polished).
>
> Vladimir
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
> Sent: Thursday, February 07, 2008 10:33 AM
> To: [log in to unmask]
> Subject: [TN] FAB: Thin Trace Failures
>
> Has anyone ever seen a cross-section like this?
>
> http://www.frontdoor.biz/PCBportal/opentrace.jpg
>
> (ignore the words on the pic, just a guess)
>
> Can you point me in the right direction for cause?
>
> thanks,
> Jack
>
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