Scott,
           I would optimize your preclean process 1st. Check your rinse
     water quality and then your driers to be sure they are operating
     correctly.
           The next thing is how is your queing prior to application? Is
     the enviroment controlled to any degree? Hold time is kept to a
     minimum etc.?
           Hope this helps.

     Mike Doty
     P.E. Hadco TCE


______________________________ Reply Separator _________________________________
Subject: [TN] Copper cleaning
Author:  "Scott B. Westheimer" <[log in to unmask]> at smtplink-hadco
Date:    11/18/99 8:43 AM


I am looking for the procedure for checking the copper surface after LPI
pre-cleaning. I thought that there was an IPC test method to check for any
residues on the copper surface after cleaning and before LPI. Does anyone
have a test method. Also would be interested in knowing what type of
cleaning procedures people use prior to LPI screening. We have a serious
problem with oxidation after cleaning and before screening LPI.

Thanks

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