Question 56 CEL02 - Chief Engineer - Limited (Alt)

The Correct Answer is D. **Why option D ("Corroded pin connectors") is correct:** The act of removing a printed circuit board (PCB) from its edge card connector and then reinserting it (a process often referred to as "reseating the board") uses physical friction. This friction, generated as the gold-plated fingers of the PCB scrape against the metal contacts inside the connector housing, can temporarily clean minor surface corrosion, oxidation, or contamination (like dust or film) that may be impeding electrical contact. When the board is reseated, the newly scrubbed area of the contact often establishes a functional electrical connection, resolving the temporary connectivity issue. **Why the other options are incorrect:** * **A) Open traces or broken connections:** These are physical structural defects (cracks in the copper trace or broken solder joints) that require repair (soldering or bridging), not simply reseating the board. Reseating cannot fix a broken circuit path on the board itself. * **B) Discolored or darkened components:** Component discoloration is usually a sign of sustained overheating or physical damage. Reseating the board does not alter the physical state or temperature history of the components. * **C) Leaking components:** "Leaking" typically refers to electrolytic capacitors that are failing and expelling electrolyte fluid. This is a permanent component failure that requires replacement; reseating the board will have no effect on this internal failure.