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The following grounding equipment is recommended to prevent electrostatic damage:
●
Antistatic tape
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Antistatic smocks, aprons, and sleeve protectors
●
Conductive bins and other assembly or soldering aids
Nonconductive foam
●
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Conductive tabletop workstations with ground cords of one megohm resistance
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Static-dissipative tables or floor mats with hard ties to the ground
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Field service kits
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Static awareness labels
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Material-handling packages
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Nonconductive plastic bags, tubes, or boxes
Metal tote boxes
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Electrostatic voltage levels and protective materials
The following table lists the shielding protection provided by antistatic bags and floor mats.
Material
Antistatic plastics
Carbon-loaded plastic
Metallized laminate
Electrostatic discharge damage
Electronic components are sensitive to electrostatic discharge (ESD). Circuitry design and structure determine
the degree of sensitivity. Networks built into many integrated circuits provide some protection, but in many
cases, ESD contains enough power to alter device parameters or melt silicon junctions.
A discharge of static electricity from a finger or other conductor can destroy static-sensitive devices or
microcircuitry. Even if the spark is neither felt nor heard, damage may have occurred.
An electronic device exposed to ESD may not be affected at all and can work perfectly throughout a normal
cycle. Or the device may function normally for a while, then degrade in the internal layers, reducing its life
expectancy.
CAUTION:
observe these precautions:
Keep components in their electrostatic-safe containers until you are ready to install them.
Before touching an electronic component, discharge static electricity by using the guidelines described in this
section.
Avoid touching pins, leads, and circuitry. Handle electronic components as little as possible.
If you remove a component, place it in an electrostatic-safe container.
The following table shows how humidity affects the electrostatic voltage levels generated by
different activities.
16
Chapter 4 Removal and replacement procedures preliminary requirements
To prevent damage to the tablet when you are removing or installing internal components,
Use
Bags
Floor mats
Floor mats
Voltage protection level
1,500 V
7,500 V
5,000 V
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