Compaq 2200 Service Guide - Page 81

Removal and Replacement Preliminaries 4.6 Workstation Precautions Use the following grounding precautions at workstations: ■ Cover the workstation with approved static-shielding material (refer to "Table 4-2 Static-Shielding Materials"). ■ Use a wrist strap connected to a properly grounded work surface and use properly grounded tools and equipment. ■ Use conductive field service tools, such as cutters, screwdrivers, and vacuums. ■ When using fixtures that must directly contact dissipative surfaces, only use fixtures made of static-safe materials. ■ Keep the work area free of nonconductive materials, such as ordinary plastic assembly aids and Styrofoam. ■ Handle electrostatic-sensitive components, parts, and assemblies by the case or PCM laminate. Handle these items only at static-free workstations. ■ Avoid contact with pins, leads, or circuitry. ■ Turn off power and input signals before inserting or removing connectors or test equipment. 4.7 Grounding Equipment and Methods Grounding equipment must include either a wrist strap or a foot strap at a grounded workstation. ■ When seated, wear a wrist strap connected to a grounded system. Wrist straps are flexible straps with a minimum of one megohm ±10% resistance in the ground cords. To provide proper ground, wear a strap snugly against the skin at all times. On grounded mats with banana-plug connectors, use alligator clips to connect a wrist strap. ■ When standing, use foot straps and a grounded floor mat. Foot straps (heel, toe, or boot straps) can be used at standing workstations and are compatible with most types of shoes or boots. On conductive floors or dissipative floor mats, use foot straps on both feet with a minimum of one megohm resistance between the operator and ground. To be effective, the conductive strips must be worn in contact with the skin. Maintenance and Service Guide 4-5