If using a small selective solder pot for the PTH soldering, be sure to
check it and take action. Had a small pot reach 5 times the Au limit. Tests
plotted nicely with a steady proportionate increase every month. No action
taken. That pot was worth more than usual reclaim metal 10 years ago.
My former EU colleagues had a flaw in their monitoring system. Took the
data and plotted it, did not forward the information from the Quality group
to the Production group.
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