Dear TechNet,

What would cause a perfect ring void just under the knee of the hole, with
the knee
intact? Drill, DML, Dry film, light scrub, Pre plate clean- acid cleaner & Na
Persulfate Etch 10-15 micro inches, Acid CU, Acid bright Tin, Mono DF strip,
Ammoniacal
Etch. Job specific to 1 part # all other product running along side is
perfect.
All material Std. .062 Fr-4 1/1. Longtime runner w/ no probs in past.

Thanks,

Julie Dixon

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