Same date code does not necessarily mean the same batch of boards.

Its simple to test the boards this procedure has been posed before to test
the board and so have the video clips on what you may see to tell if it's
the boards or not.

Outgassing testing of boards the Bob Willis way

www.bobwillis.co.uk/video/outgassing.wmv 

This is a ? out of the 10 performance

www.bobwillis.co.uk/videoclips/outgassing01.wmv 

This is a ? out of 10

www.bobwillis.co.uk/videoclips/outgassing02.wmv   

Its not just boards that do it!!

www.bobwillis.co.uk/videoclips/outgassing5.wmv 

Test method  www.bobwillis.co.uk/outgass.rtf 

Many thanks

Bob Willis
2 Fourth Ave, Chelmsford, Essex, CM1 4HA England
Tel: (44) 1245 351502
Fax: (44) 1245 496123
Mobile: 07860 775858
 
www.ASKbobwillis.com
 
Book your place on Bob's "Step by Step Failure Analysis Workshop" 14th May
www.ASKbobwillis.com/faworkshops.pdf
 
 New "Printed Board Inspection & Quality Control" 3 July
www.ASKbobwillis.com/PCBworkshop.pdf 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ken Bloomquist
Sent: 16 April 2008 18:03
To: [log in to unmask]
Subject: [TN] Out Gassing

No sooner do I get back and I need some help. This is an age old subject
that has once again reared its ugly head.

We have an assembly that we are building with mixed technology. We have a
kit for several thousand and we release them in work orders of 250. All of
the PWB's have the same date code 3307. We process about 500 a day.

The first 250 went through without a hitch; the second 250 had a few pin
holes in the through-hole components; the last 250 were terrible with what
I'd call severe out gassing on 50 out of 250.

What the heck would cause a drift like that from Tuesday to Wednesday?

Thank,

KennyB


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