Which of the following precautions are fundamental steps to prevent ESD damage during a repair? (Choose two.)

Question

Options

• AClean ESD mats regularly.
• BApply a display protective cover on top of physically damaged displays.
• CAvoid synthetic materials into the work area.
• DUse a battery cover whenever the case is removed from the device.
• EDiscard used screws.

• A
  90% (54)
• B
  3% (2)
• D
  5% (3)
• E
  2% (1)

Explanation

A (Clean ESD mats regularly) is correct because ESD mats work by safely dissipating static charges to ground - but only when they're clean and properly maintained. Contamination reduces conductivity and renders the mat ineffective. C (Avoid synthetic materials) is correct because fabrics like nylon and polyester generate static electricity through friction (triboelectric effect), making them a primary source of ESD hazards in a repair environment.

B is a physical damage precaution, not an ESD control measure - protective covers guard screens but don't address static. D (using a battery cover) relates to power isolation or physical protection, not electrostatic discharge prevention. E (discarding used screws) is poor practice in general and has no connection to ESD at all.

Memory tip: Think "Clean and Natural" - keep your Clean mat (A) and ban syNthetics (C). Both letters are about maintaining a static-safe environment through surface hygiene and material control.

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