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Difficulty: HardSafety Procedures and Environmental Controls

An IT technician is assigned to perform internal component replacements on a legacy rackmount management console that integrates high-voltage power circuits and a CRT monitor module. Before opening the chassis and servicing internal components, which of the following safety precautions must the technician follow? (Select TWO.)

  1. Disconnect the unit from all external AC power sources and remove personal metal items such as rings and watches prior to touching internal components.Answer
  2. Refrain from wearing an anti-static ESD wrist strap while working directly on high-voltage components such as CRT display modules and power supplies.Answer
  3. C
    Attach an ESD wrist strap grounding clip directly to an uninsulated neutral conductor wire inside the electrical enclosure to maintain equipotential bonding.
  4. D
    Keep the main power cable plugged into an active wall outlet throughout internal high-voltage component replacement to maintain a continuous chassis ground connection.

Answer

The correct safety precautions are disconnecting all external AC power sources while removing metal jewelry, and refraining from wearing an ESD wrist strap when working directly around high-voltage CRT power circuitry.
When servicing high-voltage components such as CRT displays and power supplies, safety protocols dictate disconnecting all AC power and removing personal metal jewelry to prevent shorting circuits or receiving an electric shock. Additionally, technicians must never wear an ESD wrist strap when working on high-voltage circuitry, as the ground connection provides a current path through the body if high voltage is accidentally touched.

Step-by-Step Solution

1
Identify high-voltage safety hazards associated with CRT units and power supplies.
Recognize that CRTs and high-voltage power supplies store high voltages capable of causing severe electric shock.
Standard ESD protection rules differ when working with high-voltage equipment versus low-voltage computer components.
2
Evaluate power disconnection and personal PPE/jewelry protocols.
Ensure AC power is disconnected and metal jewelry is removed before servicing internal components.
Removing jewelry prevents short circuits and thermal burns, while disconnecting power removes active line voltage.
3
Evaluate ESD grounding safety rules for high-voltage environments.
Do not wear an ESD wrist strap near exposed CRT capacitors or high-voltage circuits.
ESD wrist straps ground the technician to earth; if high voltage is accidentally touched, current could flow directly through the strap across the technician's body.

Key Concept

High-Voltage Safety Precautions and ESD Wrist Strap Exceptions for CRTs and Power Supplies
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Topics

Safety Procedures and Environmental Controls

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