compaq notebook evo n150 series User Manual
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4–2Maintenance and Service Guide Removal and Replacement Preliminaries Plastic Parts Using excessive force during disassembly and reassembly can damage plastic parts. Use care when handling the plastic parts. Apply pressure only at the points designated in the maintenance instructions. Cables and Connectors Cables must be handled with extreme care to avoid damage. Apply only the tension required to unseat or seat the cables during removal and insertion. Handle cables by the connector whenever possible. In all cases, avoid bending, twisting, or tearing cables. Ensure that cables are routed in such a way that they cannot be caught or snagged by parts being removed or replaced. Handle flex cables with extreme care; these cables tear easily. ÄCAUTION:When servicing the computer, ensure that cables are placed in their proper locations during the reassembly process. Improper cable placement can damage the computer. 4.3 Preventing Damage to Removable Drives Removable drives are fragile components that must be handled with care. To prevent damage to the computer, damage to a removable drive, or loss of information, observe the following precautions: Before removing or inserting a hard drive, shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the computer on, then shut it down. Before removing a diskette drive or optical drive, ensure that a diskette or disc is not in the drive. Ensure that the optical drive tray is closed.
Removal and Replacement Preliminaries Maintenance and Service Guide4–3 Before handling a drive, ensure that you are discharged of static electricity. While handling a drive, avoid touching the connector. Handle drives on surfaces that have at least one inch of shock-proof foam. Avoid dropping drives from any height onto any surface. After removing a hard drive, CD-ROM drive, or a diskette drive, place it into a static-proof bag. Avoid exposing a hard drive to products that have magnetic fields such as monitors or speakers. Avoid exposing a drive to temperature extremes or to liquids. If a drive must be mailed, place the drive into a bubble pack mailer or other suitable form of protective packaging and label the package “Fragile: Handle With Care.”
4–4Maintenance and Service Guide Removal and Replacement Preliminaries 4.4 Preventing Electrostatic Damage Many 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 the discharge contains enough power to alter device parameters or melt silicon junctions. A sudden discharge of static electricity from a finger or other conductor can destroy static-sensitive devices or microcircuitry. Often the spark is neither felt nor heard, but damage occurs. An electronic device exposed to electrostatic discharge may not be affected at all and can work perfectly throughout a normal cycle. The device may function normally for awhile, then degrade in the internal layers, reducing its life expectancy. 4.5 Packaging and Transporting Precautions Use the following grounding precautions when packaging and transporting equipment: To avoid hand contact, transport products in static-safe containers such as tubes, bags, or boxes. Protect all electrostatic-sensitive parts and assemblies with conductive or approved containers or packaging. Keep electrostatic-sensitive parts in their containers until the parts arrive at static-free workstations. Place items on a grounded surface before removing items from their containers. Always be properly grounded when touching a sensitive component or assembly.
Removal and Replacement Preliminaries Maintenance and Service Guide4–5 Place reusable electrostatic-sensitive parts from assemblies in protective packaging or non conductive foam. Use transporters and conveyers made of antistatic belts and roller bushings. Ensure that mechanized equipment used for moving materials is wired to ground and that proper materials were selected to avoid static charging. When grounding is not possible, use an ionizer to dissipate electric charges. 4.6 Workstation Precautions Use the following grounding precautions at workstations: Cover the workstation with approved static-dissipative material (refer to Table 4-2). 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.
4–6Maintenance and Service Guide 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 megaohm ±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-megaohm 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 Non-conductive foam Conductive tabletop workstations with ground cords of one-megaohm resistance Static-dissipative table or floor mats with hard tie to ground Field service kits Static awareness labels Material-handling packages
Removal and Replacement Preliminaries Maintenance and Service Guide4–7 Non-conductive 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 4-2 lists the shielding protection provided by antistatic bags and floor mats. Ta b l e 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. Ta b l e 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
Maintenance and Service Guide5–1 5 Removal and Replacement Procedures This chapter provides removal and replacement procedures. All screws removed during disassembly are P0 Phillips screws. There are 64 screws and screwlocks in 13 different sizes that must be removed and replaced 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.
5–2Maintenance and Service Guide 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
Removal and Replacement Procedures Maintenance and Service Guide5–3 5.2 Disassembly Sequence Chart Use the following chart to determine the section number to be referenced when removing computer components. Ta b l e 5 - 1 Disassembly Sequence Chart Section Description#ofScrews Removed 5.3 Preparing the computer for disassembly 0 5.4 Computer feet 0 5.5 Hinge covers 0 5.6 Keyboard 2 5.7 Display 4 5.8 EMI shield 1 5.9 Top cover 18 5.10 TouchPad 5 5.11 Speakers 10 5.12 Microphone 0 5.13 Display lid switch board 1 5.14 Heat sink 5 5.15 Infrared board 1 5.16 System board 11 5.17 PC Card assembly 2 5.18 Mini PCI board 0 5.19 Disk cell real time clock (RTC) battery 0
5–4Maintenance and Service Guide Removal and Replacement Procedures 5.3 Preparing the Computer for Disassembly Perform the following steps before disassembling the computer. Consult the computerHardware Guidefor instructions on the following steps: 1. Turn off the computer. 2. Disconnect the AC Adapter and all external devices. 3. Remove the battery pack. 4. Remove the hard drive. 5. Remove the Media Bay device. 5.4 Computer Feet The computer feet are adhesive-backed rubber pads. The computer feet are included in the Miscellaneous Plastics Kit (spare part number 239039-001). Refer to Figure 5-2 for the computer feet locations. Figure 5-2. Replacing the Computer Feet