Hi Leif,

As a CM it varies greatly.  We sometimes get boards that do not have
fiducials on them and end up using a PTH or a SMT pad.  With this set-up
it's not uncommon to incorrectly read what is being used as a fiducial
and end up with a misprint.  I'd say this happens about 20% of the time
we need to do it.

When we have a proper board with fiducials properly designed and located
and we wipe the stencil as specified any misprint triggers a corrective
action.
This is for products that are released for production.  

On NPI we may have some misprints before we are completely happy with
the alignment but still a maximum of 2-3 panels.

Regards,

Jerry Dengler
Production Manager
Pergamon Corporation
PH:  610-239-0721
Fax: 610-239-0720



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leif Erik Laerum
Sent: Thursday, February 19, 2009 9:00 AM
To: [log in to unmask]
Subject: [TN] Misprints

Technetters,

We are discussing misprints and what would be an acceptable ratio of
misprints. What are people on this forum comfortable with? I realize
this this is a very open ended question, but it would be interesting to
hear if there is a industry consensus on this one. What would trigger
corrective action?

Thank you!


--
Leif Erik Laerum
Quality Assurance Manager
Texas Memory Systems
[log in to unmask]
Tel: (713) 266-3200 x468
www.texmemsys.com

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