HP Nc6220 HP Compaq nc6220 and nc6230 Notebook PC - Maintenance and Service Gu - Page 100

Removal and Replacement Preliminaries 5.6 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, drivers, and vacuums. ■ When fixtures must directly contact dissipative surfaces, use fixtures made only 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. 5.7 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. 5-6 Maintenance and Service Guide