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| Date: | Fri, 15 Sep 95 12:06:21 EDT |
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MY EXPERIENCE WITH OPENS IN RIGID FLEX LEADS ME TO BELIEVE POOR QUALITY OF
PLATED THRU HOLES (ESPECIALLY SMALL ONES) IS CAUSING THE OPENS, ESPECIALLY IF
THE STACKUP HAS A LARGE PERCENTAGE OF ACRYLIC IN THE HOLE BARRELS. I WOULD
CROSS SECTION THE HOLES AFTER YOUR THERMAL CYCLING.
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