Hi All,
We've made boards for a customer for a few years.  They've  been very
satisfied with HASL finish.  Last month they started rejecting approx 40% of
boards received (3 lots) because their P&P camera couldn't locate the
fiducials.  The coating looks typical to us (thickness & smoothness).
Customer can't see any difference between good & bad boards until they're on
the P&P machine.  They say they haven't changed equipment, processes or
operators.  We say the same.  No HASL hassles from other customers in this
time period.  We tried reworking by wicking solder from the fiducials.
Customer rejected approx. 20% for the same reason.  They also say that
boards from another vendor are working fine.
Any comments/ ideas?


Mark

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