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Zorluk: Çok zorSafety Procedures and Environmental Controls

A field technician is servicing hardware inside a server room. The technician disconnects a modular computer power supply unit (PSU) from the main AC electrical outlet and allows it to sit on an anti-static mat for 15 minutes. Intending to replace a faulty internal cooling fan inside the power supply casing, the technician attaches an ESD wrist strap to the PSU's metal enclosure and opens the PSU housing using insulated hand tools. Which of the following identifies the primary safety violation committed by the technician?

  1. Opening and attempting internal component repairs on a power supply unit rather than replacing the entire modular assemblyCevap
  2. B
    Attaching the ESD wrist strap to the power supply enclosure instead of connecting it directly to an external earth ground point
  3. C
    Failing to allow a mandatory 24-hour discharge window for internal components before removing the outer metal casing
  4. D
    Using insulated hand tools inside an anti-static work area without first treating the tools with anti-static spray

Cevap

Opening and attempting internal component repairs on a power supply unit rather than replacing the entire modular assembly is the primary safety violation because power supplies contain high-voltage capacitors that retain lethal electrical charges even when unplugged.
Power supply units (PSUs) and CRT monitors contain high-voltage capacitors capable of storing lethal electrical charges long after being unplugged from an electrical outlet. According to CompTIA A+ safety standards, PSUs are considered non-field-serviceable components and should never be opened or repaired internally by a field technician. The entire PSU assembly must be replaced if faulty.

Adım Adım Çözüm

1
Analyze the high-voltage hazard involved in opening a computer Power Supply Unit (PSU).
Recognize that PSUs store high voltage inside internal capacitive components.
Capacitors can retain lethal voltage levels for an extended period even after the unit is disconnected from external power.
2
Evaluate CompTIA safety procedures regarding field-serviceable parts.
Determine that PSUs are classified as non-field-serviceable assemblies.
Technicians must always replace the entire PSU assembly rather than disassembling the unit to fix internal components such as fans or capacitors.
3
Identify the primary safety violation from the scenario.
The act of opening the PSU casing poses a severe risk of electrical shock or electrocution.
Personal safety takes precedence over ESD precautions or tool selection when dealing with high-voltage hazards.

Anahtar Kavram

High-Voltage Safety and Non-Field-Serviceable Components
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Konular

Safety Procedures and Environmental Controls

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