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April 2008

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Subject:
From:
Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Joyce Koo <[log in to unmask]>
Date:
Wed, 16 Apr 2008 13:07:00 -0400
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Moisture absorption ?
--------------------------
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----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Wed Apr 16 13:03:14 2008
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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