An IT technician is troubleshooting a desktop computer that frequently turns off without warning. After isolating the failure to a damaged internal component within the workstation's power supply unit (PSU), the technician prepares to open the PSU housing to solder a replacement part. Which of the following actions represents the proper safety procedure the technician should follow?
- Replace the entire power supply unit as a single field-replaceable unit rather than servicing internal components.Answer
- BAttach an anti-static ESD wrist strap to an unpainted metal chassis surface before opening the PSU enclosure.
- CShort the internal high-voltage capacitors with a standard insulated screwdriver to discharge remaining power before soldering.
- DDisconnect the AC power cable and allow the unit to sit for 30 seconds before opening the internal metal housing.
Answer
The technician must replace the power supply unit as an entire assembly rather than opening the housing to repair internal components.
Power supply units (PSUs) are considered non-serviceable field-replaceable units (FRUs) for computer technicians. High-voltage capacitors inside the PSU can retain lethal electrical charges long after the PC is unplugged. Standard safety procedures mandate replacing the entire unit rather than opening the chassis for internal repair.
Step-by-Step Solution
Key Concept
High-Voltage Equipment Safety & Field-Replaceable Units (FRU)