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Tue, 6 Mar 2012 22:34:05 +0000 |
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Working on single sided legacy boards, I finding half moon rub marks on the traces adjacent to pads, about 0.15" (3.5mm) away. They are circular in nature (half moon shape) on the edges of the traces. Definitely mechanically made. These boards are roughly 40 years old and have never been used. I'm inspecting them prior to installation.
Anyone know of any OLD process that could make these types of marks. I have inspected 4 boards and find the same types of deformation on all of the boards although not in the same places.
I suspect the boards were originally hand soldered, as there is no solder mask on the runs and they are plated with no excess solder clinging to them.
pat
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