Yes it is a good argument. The yield in a circuit board plant can basically
be guaranteed to show in your X out ratio since all boards in a panel are
effectively joined at the hip and every defect of short/ open and other
defect at every stage may lead to an individual coupon being X'd out, so
effectively the non X'd out quantity represent the cumulative rolled yield
through every process step.



John Burke
(408) 515 4992

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wilson, Bob
Sent: Wednesday, December 17, 2008 10:47 AM
To: [log in to unmask]
Subject: [TN] x-outs in panel

Thanks for all of the great replies on the board cleaning question....

Here's another:

Purchasing is asking: When a fabricator panels a board and there are
x-outs within the panel, does that mean that the fabricator isn't
competent?

We have received 90% of our boards separated into single units and we
now have an assembler that wants the boards in a panel.  Some of the
boards in the panel are x-ed out.

I'm saying that x-outs are common enough, that more than one board is
usually not good enough to be used for production, but that is because
of the tight tolerances and difficult manufacturing methods.

Is that a good argument?

http://video.google.com/videoplay?docid=-572077907195969915

(Link opens a video).

Bob Wilson
E/M Designer, CID+
SpectraSensors, Inc.
11027 Arrow Route
Rancho Cucamonga, CA 91730
(909) 948-4110
www.spectrasensors.com
www.ipc.org


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