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Question

Difficulty: EasySafety Procedures and Environmental Controls

A technician is troubleshooting a desktop computer that experiences sudden shutdowns. The technician suspects the cooling fan inside the power supply unit (PSU) has failed and considers opening the PSU chassis to replace the fan. Which of the following is the proper safety procedure the technician should follow?

  1. Do not open the power supply unit chassis and replace the entire PSU assembly instead.Answer
  2. B
    Attach a grounded ESD wrist strap to the PSU casing before disassembling the internal power circuit board.
  3. C
    Keep the power cable plugged into a grounded wall outlet to maintain continuous chassis earthing during internal PSU repairs.
  4. D
    Discharge ESD static buildup onto an anti-static mat before using uninsulated screwdrivers inside the PSU enclosure.

Answer

Do not open the power supply unit chassis and replace the entire PSU assembly instead.
Power supply units contain internal capacitors that hold high voltage even after being unplugged from an electrical outlet. Standard IT safety procedures mandate that power supplies are treated as non-serviceable Field Replaceable Units (FRUs) that must be replaced entirely rather than opened for internal repairs.

Step-by-Step Solution

1
Identify the component requiring maintenance.
The component identified is the internal cooling fan of the Power Supply Unit (PSU).
PSUs contain high-voltage capacitors capable of storing lethal electrical charges long after power has been disconnected.
2
Apply CompTIA safety standards for high-voltage hazards.
Recognize that field technicians should never open high-voltage power supplies or CRT monitors.
Internal servicing of high-voltage enclosures presents severe electrocution risks.
3
Select the correct operational procedure.
Replace the entire power supply unit rather than opening its chassis.
Replacing the modular unit eliminates the high-voltage safety hazard completely.

Key Concept

High-Voltage Hazard Safety and Field Replaceable Units (FRUs)
Estimated Time:45s
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Topics

Safety Procedures and Environmental Controls

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