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compaq presario 900 series User Manual

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    							3–14Maintenance and Service Guide
    Illustrated Parts Catalog
    3.6 Miscellaneous
    Ta b l e  3 - 5
    Spare Parts: Miscellaneous (not illustrated)
    DescriptionSpare Part 
    Number
    Logo Kit285547-001
    Screw Kit, includes the following screws (Refer to Appendix C, 
    “Screw Listing,” for more information on screw specifications 
    and usage.)285542-001
    ■Torx T8 Metric 2.5 × 5.0
    ■Torx T8 Metric 2.5 × 8.0
    ■Torx T8 Metric 2.5 × 9.0
    ■Torx T8 Metric 2.5 × 14.0
    shoulder screw
    ■Phillips Metric 3.0 × 3.0
    ■Phillips Metric 2.5 × 4.0
    ■Phillips Metric 2.0 × 4.5
    AC adapter, 90 W, 3 wire, slim line286755-001
    Power cords, 3 wire
    Danish
    International
    Italian170513-081
    170513-002
    170513-061Swiss
    U.K. English
    U.S. English170513-115
    170513-031
    170513-001
    272638-001.book  Page 14  Thursday, July 25, 2002  4:21 PM 
    						
    							Maintenance and Service Guide4–1
    4
    Removal and Replacement
    Preliminaries
    This chapter provides essential information for proper and safe 
    removal and replacement service.
    4.1 Tools Required
    You will need the following tools to complete the removal and 
    replacement procedures:
    ■Magnetic screwdriver
    ■Phillips P0 screwdriver
    ■Torx T8 screwdriver
    ■Tool kit (includes connector removal tool, loopback plugs, 
    and case utility tool)
    272638-001.book  Page 1  Thursday, July 25, 2002  4:21 PM 
    						
    							4–2Maintenance and Service Guide
    Removal and Replacement Preliminaries
    4.2 Service Considerations
    The following sections include some of the considerations that 
    you should keep in mind during disassembly and assembly 
    procedures.
    ✎As you remove each subassembly from the computer, place the 
    subassembly (and all accompanying screws) away from the work 
    area to prevent damage.
    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.
    272638-001.book  Page 2  Thursday, July 25, 2002  4:21 PM 
    						
    							Removal and Replacement Preliminaries
    Maintenance and Service Guide4–3
    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.
    ■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 in 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 in a bubble-pack 
    mailer or other suitable form of protective packaging and 
    label the package “Fragile: Handle With Care.”
    272638-001.book  Page 3  Thursday, July 25, 2002  4:21 PM 
    						
    							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. Or the device may function normally for a while, 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.
    272638-001.book  Page 4  Thursday, July 25, 2002  4:21 PM 
    						
    							Removal and Replacement Preliminaries
    Maintenance and Service Guide4–5
    ■Store reusable electrostatic-sensitive parts from assemblies in 
    protective packaging or nonconductive 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 
    are 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.
    272638-001.book  Page 5  Thursday, July 25, 2002  4:21 PM 
    						
    							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 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
    272638-001.book  Page 6  Thursday, July 25, 2002  4:21 PM 
    						
    							Removal and Replacement Preliminaries
    Maintenance and Service Guide4–7
    ■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 4-2 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 V.
    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
    272638-001.book  Page 7  Thursday, July 25, 2002  4:21 PM 
    						
    							Maintenance and Service Guide5–1
    5
    Removal and Replacement
    Procedures
    This chapter provides removal and replacement procedures.
    There are 57 screws, in seven 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.
    272638-001.book  Page 1  Thursday, July 25, 2002  4:21 PM 
    						
    							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 as indicated in Figure 5-1.
    Figure 5-1. Serial Number Location
    272638-001.book  Page 2  Thursday, July 25, 2002  4:21 PM 
    						
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