Assessments - 2, GPA: 3 ( )

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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. Maintenance and Service Guide 4-5 Removal and Replacement Preliminaries 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, connect a wrist strap with alligator clips. ■ 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. Other grounding equipment recommended for use in preventing electrostatic damage includes: ■ Antistatic tape ■ Antistatic smocks, aprons, and sleeve protectors ■ Conductive bins and other assembly or soldering aids ■ Nonconductive foam ■ Conductive tabletop workstations with ground cords of one-megohm resistance ■ Static-dissipative tables or floor mats with hard ties to the ground ■ Field service kits ■ Static awareness labels ■ Material-handling packages 4-6 Maintenance and Service Guide Removal and Replacement Preliminaries ■ Nonconductive plastic bags, tubes, or boxes ■ Metal tote boxes ■ Electrostatic voltage levels and protective materials Table 4-1 shows how humidity affects the electrostatic voltage levels generated by different activities. Table 4-1 Typical Electrostatic Voltage Levels Relative Humidity Event 10% 40% 55% Walking across carpet 35,000 V 15,000 V 7,500 V Walking across vinyl floor 12,000 V 5,000 V 3,000 V Motions of bench worker 6,000 V 800 V 400 V Removing DIPS from plastic tube 2,000 V 700 V 400 V Removing DIPS from vinyl tray 11,500 V 4,000 V 2,000 V Removing DIPS from Styrofoam 14,500 V 5,000 V 3,500 V Removing bubble pack from PCB 26,500 V 20,000 V 7,000 V Packing PCBs in foam-lined box 21,000 V 11,000 V 5,000 V A product can be degraded by as little as 700 volts. Maintenance and Service Guide 4-7 Removal and Replacement Preliminaries Table 4-2 lists the shielding protection provided by antistatic bags and floor mats. Table 4-2 Static-Shielding Materials Material Use Voltage Protection Level Antistatic plastic Bags 1,500 V Carbon-loaded plastic Floor mats 7,500 V Metallized laminate Floor mats 5,000 V 4-8 Maintenance and Service Guide 5 Removal and Replacement Procedures This chapter provides removal and replacement procedures. Phillips P1 screws are removed during disassembly. There are 48 screws, in nine different sizes, that must be removed, replaced, and loosened when servicing the computer. Make special note of each screw size and location during removal and replacement. Refer to Appendix C, “Screw Listing,” for detailed information on screw sizes, locations, and usage. Maintenance and Service Guide 5-1 Removal and Replacement Procedures 5.1 Serial Number Report the computer serial number to Compaq when requesting information or ordering spare parts. The serial number is located on the bottom of the computer (Figure 5-1). Figure 5-1. Serial Number Location 5.2 Disassembly Sequence Chart Use the chart below to determine the section number to be referenced when removing computer components. Table 5-1 Disassembly Sequence Chart Section Description # of Screws Removed 5.3 Preparing the computer for disassembly Battery pack 0 5-2 Maintenance and Service Guide Removal and Replacement Procedures Table 5-1 Disassembly Sequence Chart (Continued) Section Description # of Screws Removed 5.3 (continued) MultiBay device 0 Hard drive 1 to remove hard drive 2 to separate hard drive bezel from hard drive 5.4 Computer feet 0 5.5 Memory expansion board 1 loosened 5.6 Mini PCI communications board 1 loosened 5.7 Connector cover 2 5.8 LED cover 2 5.9 Keyboard 2 to remove keyboard shield 5.10 Display 4 5.11 Top cover 16 5.12 Speaker assembly 0 5.13 Display release assembly 2 5.14 TouchPad 4 5.15 Fan 4 loosened 5.16 Processor 0 5.17 Disk cell RTC battery 0 5.18 System board 5 5.19 Modem cable 0 Maintenance and Service Guide 5-3 Removal and Replacement Procedures 5.3 Preparing the Computer for Disassembly Perform the following steps before disassembling the computer: 1. Turn off the computer. 2. Disconnect the AC adapter and all external devices. 3. Remove the battery pack by following these steps: a. Turn the computer bottom side up with the left side fa...

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