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222. After unplugging a suspected damaged printed circuit board from its edge card connector, what may be revealed by slightly flexing the board?
Flexing a printed circuit board can reveal hairline cracks that are otherwise undetectable. These cracks are subtle fractures in the board or its traces, and flexing causes them to widen, making them visible or disrupting electrical continuity. Obvious defects like warping, corrosion, or complete breaks are typically apparent without flexing.
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