Greetings Techno's;

     I am member of a No Clean Sterring Committee that is reviewing our
     internal process that we are presently processed to perform, and
     determine what is the best approach and what it would it take to
     change over our lines to "NO CLEAN".  The industry and our owners are
     driving this change. The following are some questions I have and
     wonder anyone out there that has experienced similar changes recently
     a who would like to share their "Lessons Learned" with me.  We are
     building a mix technology, (i.e.; SMT only, SMT+thru hole, and thru
     onle). Our products have various finishes, (i.e., potting and/or
     conformal coat)

     The following are some questions I have come across:

     1) What is the best No Clean Flux that works well with organic coated
     boards. We are looking at our suppliers using Entek CU-106A organic
     coating?

     2) Does the level of preheat that the organic coating is exposed to
     detrimental to the shelf life of the coating? If so, what is the
     amount of time period between IR reflow and wavesolder for a board
     that has been exposed to IR reflow for SMT purposes?  We are
     experiencing poor solderability on the thru-hole components to the top
     side of the circuit side.

     3) Does the type of solder mask that is on the print wiring board
     surface have any effects on the PPM level for solder balls? Does
     anyone have any experience on this subject?

     4) Does it hinder a companies purchasing power to narrow your
     selection of types of solder mask? We presently have 8 different
     solder mask finishes on our various products.

     5) Does anyone out there have any experience on the Paste Inspection
     system made by General Scanning? We recently brought a GC8200 in house
     for evaluation. Initial data reflects that the measurement readings
     obtained for CpK and Gage R&R are not acceptable. We used the
     theoretical volume to calculate the mean and standard deviation. Is
     this the accurate way of measurement? If someone out there that has
     experience with this system that can help me, please respond.

     I took up your time enough. Have a good day.

     Thanks

     Donn Steffen
     Senior Quality Engineer
     VDO Control Systems, Inc.
     Auburn, IN

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