1. Coupons will take 400 v, but I don't think many of today's components will
stand up it. That is why I am surprised re your statement about PWAs being
tested under the stated conditions.
2. Has ionic contamination testing been done on the PWA?
3. What type of solder mask is being used?
4. Wave solder flux? Solder paste? Cored solder wire? What sort of
contaminant source(s) are suspected?
5. Were the PWAs cleaned? If so, how?
6. Have there always been problems with the PWA or is this new?

I'm sure there will be other questions, but this will serve to get the gurus
underway.

Bill Kenyon
Global Centre Consulting
3336 Birmingham Drive
Fort Collins, CO   80526
Tel: 970.207.9586   New Cell: 970.980.6373

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