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April 2008

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Subject:
From:
Leland Woodall <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Leland Woodall <[log in to unmask]>
Date:
Tue, 22 Apr 2008 11:16:09 -0400
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Technetters,

We recently had a Murata SMD crystal to cause a failure in the field.
This particular unit had been to Repair and the component was manually
replaced during the manufacturing process.

The vendor analysis reported the component saw excessive heat during the
rework and caused internal depolarization which led to failure.

We made 10 attempts to re-create this condition and were unsuccessful in
doing so.  We used dual soldering irons, had the temps cranked as far as
they would go, and gave them excessive exposure times.

Could the vendor analysis have been incorrect, or was their explanation
a real possibility?

Why were we not able to replicate this?

Thanks in advance,

Leland

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