Kat,
        The contamination is not just on components that are fine pitched or
the components that have a low stand off. There are signs on 0805 caps, TH
resistors, and chips of .5mm-1mm pitch, but are consistent with
components/areas that may need to be reworked by hand, or placed and
soldered by hand. As for washing I know that one used a machine and another
by hand.

Thank you for your input,

Ted

-----Original Message-----
From: Kathy Kuhlow [mailto:[log in to unmask]]
Sent: Wednesday, February 04, 2004 3:55 PM
To: [log in to unmask]
Subject: Re: [TN] contamination problems on reworks


Could you use the J-STD-001 for the cleanliness portion.  Can you make your
suppliers certify that the cleaning process for both the automated process
flux removal and the manual operations can maintain the ionic residues per
the standard?  You can then have them supply the rational of how they comply
and audit that process and the records that have resulted from the
monitoring of the process?
Was the rework to components that have little or no stand off of the PCB?
If so they should have formulated the process on how they would handle those
parts. Were the products hand washed or machine washed?  Maybe you can make
some rules for hand soldering in general in which you can specify ionic
removal, verification, and determine a common standard by which to judge the
products.

Kat

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