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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 
    						
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