HP Pavilion Dv9400 Entertainment Notebook Pc Series Service Guide
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Removal and Replacement Preliminaries Maintenance and Service Guide 4–3 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, and then shut it down through the operating system. ■Before removing a diskette drive or optical drive, ensure that a diskette or disc is not in the drive and 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 covered with 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 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.”
4–4 Maintenance 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 might not be affected at all and can work perfectly throughout a normal cycle. Or the device might function normally for a while, then degrade in the internal layers, reducing its life expectancy.
Removal and Replacement Preliminaries Maintenance and Service Guide 4–5 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. ■Store reusable electrostatic-sensitive parts from assemblies in protective packaging or nonconductive foam. ■Use transporters and conveyors 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 Maintenance and Service Guide Removal and Replacement Preliminaries 4.6 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, 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.
Removal and Replacement Preliminaries Maintenance and Service Guide 4–7 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, use alligator clips to connect a wrist strap. ■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. ■Nonconductive plastic bags, tubes, or boxes. ■Metal tote boxes. ■Electrostatic voltage levels and protective materials.
4–8 Maintenance and Service Guide Removal and Replacement Preliminaries 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
Maintenance and Service Guide 5–1 5 Removal and Replacement Procedures This chapter provides removal and replacement procedures. There are as many as 109 screws, in 11 different sizes, that must be removed, replaced, or loosened when servicing the computer. Make special note of each screw size and location during removal and replacement. Refer to Appendix A, “Screw Listing,” for detailed information on screw sizes, locations, and usage.
5–2 Maintenance and Service Guide Removal and Replacement Procedures 5.1 Serial Number Report the computer serial number to HP when requesting information or ordering spare parts. The serial number is located on the bottom of the computer. Serial Number Location 5.2 Disassembly Sequence Chart Use the chart below to determine the section number to be referenced when removing computer components. Disassembly Sequence Chart Section Description# of Screws Removed 5.3Preparing the Computer For Disassembly Battery 0
Removal and Replacement Procedures Maintenance and Service Guide 5–3 Section Description# of Screws Removed 5.4Hard Drive2 loosened to remove each hard drive cover 4 removed to disassemble each hard drive 5.5Computer Feet0 5.6Memory Module2 loosened to remove the memory module compartment cover 5.7RTC Batter y0 5.8Mini Card Module2 ÄTo prevent an unresponsive system and the display of a warning message, install only a Mini Card device authorized for use in your computer by the governmental agency that regulates wireless devices in your country or region. If you install a device and then receive a warning message, remove the device to restore computer functionality. Then contact technical support by selecting Start > Help and Support > Contact support. 5.9Optical Drive1 to remove the optical drive 2 to remove the optical drive bracket 5.10Switch Cover6 5.11Keyboard4 5.12Speaker Assembly2 5.13Power Button Board1 Disassembly Sequence Chart (Continued)
5–4 Maintenance and Service Guide Removal and Replacement Procedures Section Description# of Screws Removed 5.14Display Assembly Display bezel Camera module Display inverter Display panel Display hinges Display hinge covers Wireless antenna transceivers Microphones Camera cable6 5 0 0 6 4 0 4 0 0 5.15To p C o v e r18 5.16Wireless Switch Board2 5.17Audio Board1 5.18Bluetooth Module2 5.19USB/Magnetic Board1 5.20ExpressCard Assembly4 5.21Top Cover Support Trim5 5.22Display Lid Switch Module0 5.23Power Connector Assembly2 to remove the power connector assembly bracket 1 to remove the USB board 1 to remove the power connector assembly 5.24System Board7 5.25Fan/Heat Sink Assembly7 loosened 5.26Processor1 loosened Disassembly Sequence Chart (Continued)