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4-4 Removal and Replacement Preliminaries
4.1.6 Grounding Workstations
To prevent static damage at the workstation, use the following precautions:
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Cover the workstation with approved static-dissipative material. Provide a
wrist strap connected to the work surface and properly grounded tools and
equipment.
■
Use static-dissipative mats, heel straps, or air ionizers to give added protection.
■
Handle electrostatic sensitive components, parts, and assemblies by the case or PCB
laminate. Handle them only at static-free workstations.
■
Avoid contact with pins, leads, or circuitry.
■
Turn off power and input signals before inserting and removing connectors or test
equipment.
■
Use fixtures made of static-safe materials when fixtures must directly contact
dissipative surfaces.
■
Keep work area free of non-conductive materials such as ordinary plastic assembly
aids and Styrofoam.
■
Use field service tools, such as cutters, screwdrivers and, vacuums, that are
conductive.
■
Use a portable field service kit with a static dissipative vinyl pouch that folds out of
a work mat. Also use a wrist strap and a ground cord for the work surface. Ground
the cord to the chassis of the equipment undergoing test or repair.
4.1.7 Grounding Equipment
Use the following equipment to prevent static electricity damage to the equipment:
Wrist Straps are flexible straps with a minimum of 1 megohm +/- 10% resistance to
the ground cords. To provide proper ground, a strap must be worn snug against the
skin. On grounded mats without banana-plug connectors, connect a wrist strap with
alligator clips.
Heel straps/Toe straps/Bootstraps can be used at standing workstations and are
compatible with most types of boots and shoes. On conductive floors or dissipative
floor mats, use straps on both feet with a minimum of 1 megohm resistance between
operator and ground. To be effective, the conductive strips must be worn in contact
with the skin.