HP Pavilion G4 1100 Notebook Pc Series Service Guide
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Sequential part number listing Spare part number Description 490371-001 Power cord for use with all computer models in North America (black, 3-in, 1.83-m) 490371-011 Power cord for use only with computer models equipped with an Intel processor in Australia (black, 3-in, 1.83-m) 490371-021 Power cord for use only with computer models equipped with an Intel processor in Europe (black, 3-in, 1.83-m) 490371-031 Power cord for use only with computer models equipped with an Intel processor in the United Kingdom and Singapore (black, 3-in, 1.83-m) 490371-061 Power cord for use with all computer models in Italy (black, 3-in, 1.83-m) 490371-201 Power cord for use with all computer models in Thailand (black, 3-in, 1.83-m) 490371-202 Power cord for use with all computer models in Brazil (black, 3-in, 1.83-m) 490371-291 Power cord for use only with computer models equipped with an Intel processor in Japan (black, 3-in, 1.83-m) 490371-AA1 Power cord for use only with computer models equipped with an Intel processor in the Peoples Republic of China (black, 3-in, 1.83-m) 490371-AB1 Power cord for use only with computer models equipped with an Intel processor in Taiwan (black, 3-in, 1.83-m) 490371-AD1 Power cord for use only with computer models equipped with an Intel processor in South Korea (black, 3-in, 1.83-m) 490371-D01 Power cord for use with all computer models in Argentina (black, 3-in, 1.83-m) 490371-D61 Power cord for use only with computer models equipped with an Intel processor in India (black, 3-in, 1.83-m) 537921-001 Bluetooth module (for use only with computer models equipped with an Intel processor) NOTE:The Bluetooth module spare part kit does not include the Bluetooth module cable. The Bluetooth module cable is available using spare part number 602538-001. 593127-001 Atheros AR8002WB-1NGB 802.11b/g/n 1×1 WiFi and Bluetooth 2.1+EDR Combo Adapter (BT3.0+HS ready) for use only with computer models equipped with an AMD processor 593530-001 Intel Centrino Wireless-N 1000 for use only on computer models equipped with an Intel processor 593553-001 6-cell, 47-Whr, 2.20-Ah Li-ion battery 593554-001 6-cell, 55-Whr, 2.55-Ah Li-ion battery 593836-001 Broadcom 4313 802.11b/g/n 1×1 WiFi Adapter for use only on computer models equipped with an AMD processor 600370-001 Broadcom 4313 802.11b/g/n 1×1 WiFi and 2070 Bluetooth 2.1+EDR Combo Adapter (Bluetooth 3.0+HS ready) for use with all computer models 602538-001 Bluetooth module cable (for use only with computer models equipped with an Intel processor) 602993-001 Realtek 8188BC8 802.11a/b/g/n 2×2 WiFi and Bluetooth 3.0+HS Combo Adapter for use only with computer models equipped with an AMD processor 605560-005 Atheros 9285G 802.11b/g/n 1×1 WiFi Adapter for use with for use only with computer models computer models Sequential part number listing 33
Spare part number Description 609939-001 65-W RC V HP Smart AC adapter for use only with computer models equipped with an AMD processor 609940-001 90-W PFC RC V HP Smart AC adapter for use with all computer models 609947-001 90-W PFC RC V EM HP Smart AC adapter for use only with computer models equipped with an Intel processor 609948-001 65-W RC V EM HP Smart AC adapter for use only with computer models equipped with an Intel processor 616333-001 AMD V140 2.30-GHz processor (512-KB L2 cache, 1066-MHz 3.2-GT/sec, single core, 25 W; includes replacement thermal material) 616343-001 AMD Athlon II P340 2.20-GHz processor (1.0-MB L2 cache, 1066-MHz, 3.2GT/ sec, dual core, 25W; includes replacement thermal material) 616345-001 AMD Phenom II N850 2.20-GHz processor (1.5-MB L2 cache, 1333-MHz, 3.6GT/sec, triple core, 35W; includes replacement thermal material) 621565-001 2-GB memory module (DDR3, 10600, 1333-MHz) 621569-001 4-GB memory module (DDR3, 10600, 1333-MHz) 625823-001 Intel Core i3-380M 2.53-GHz processor (3-MB L3 cache, dual core, 35W; includes replacement thermal material) 625831-001 Intel Pentium P6200 2.13-GHz processor (3-MB L3 cache, dual core, 35W; includes replacement thermal material) 630703-001 Ralink 5390GN 802.11b/g/n 1×1 WiFi Adapter for use with all computer models 630705-001 Ralink RT3090BC4 802.11b/g/n 1×1 WiFi and Bluetooth 2.1+EDR Combo Adapter (Bluetooth 3.0+HS ready) for use only with computer models equipped with an AMD processor 631252-001 Intel Core i7-2620M 2.70-GHz (SC turbo up to 3.40-GHz) processor (4-MB L3 cache, dual core, 35W; includes replacement thermal material) 631253-001 Intel Core i5-2520M 2.50-GHz (SC turbo up to 3.20-GHz) processor (3-MB L3 cache, dual core, 35W; includes replacement thermal material) 631255-001 Intel Core i5-2540M 2.60-GHz (SC turbo up to 3.30-GHz) processor (3-MB L3 cache, dual core, 35W; includes replacement thermal material) 631956-001 Intel Centrino Advanced-N 6230 WLAN module for use only on computer models equipped with an Intel processor 634687-001 AMD Phenom II P650 2.60-GHz processor (2.0-MB L2 cache, 1066-MHz, 3.6GT/sec, triple core, 25W; includes replacement thermal material) 634688-001 AMD Phenom II P860 2.00-GHz processor (1.5-MB L2 cache, 1333-MHz, 3.6GT/sec, triple core, 35W; includes replacement thermal material) 634689-001 AMD Phenom II P960 1.80-GHz processor (2.0-MB L2 cache, 1066-MHz, 3.6GT/ sec, quad core, 25W; includes replacement thermal material) 634691-001 AMD Turion II P560 2.50-GHz processor (2.0-MB L2 cache, 1066-MHz, 3.6GT/ sec, dual core, 25W; includes replacement thermal material) 634692-001 Intel Core i3-390M 2.66-GHz processor (3-MB L3 cache, dual core, 35W; includes replacement thermal material) 634693-001 Intel Core i5-480M 2.66-GHz (SC turbo up to 2.93-GHz) processor (3-MB L3 cache, dual core, 35W; includes replacement thermal material) 34 Chapter 3 Illustrated parts catalog
Spare part number Description 635494-001 AMD Phenom II N660 3.00-GHz processor (2.0-MB L2 cache, 1333-MHz, 3.6GT/ sec, dual core, 35W; includes replacement thermal material) 635495-001 AMD Phenom II N870 2.30-GHz processor (1.5-MB L2 cache, 1333-MHz, 3.6GT/sec, triple core, 35W; includes replacement thermal material) 635496-001 AMD Phenom II N970 2.20-GHz processor (2.0-MB L2 cache, 1333-MHz, 3.6GT/ sec, quad core, 35W; includes replacement thermal material) 635500-001 Intel Pentium P6300 2.26-GHz processor (3-MB L3 cache, dual core, 35W; includes replacement thermal material) 636370-001 System board for use only with computer models equipped with an Intel processor, HM55 chipset, and a graphics subsystem with UMA video memory (includes replacement thermal material) 636371-001 System board for use only with computer models equipped with an Intel processor, HM55 chipset, and a graphics subsystem with 512-MB of discrete video memory (includes replacement thermal material) 636372-001 System board for use only with computer models equipped with an Intel processor, HM55 chipset, and a graphics subsystem with 1024-MB of discrete video memory (includes replacement thermal material) 636373-001 System board for use only with computer models equipped with an Intel processor, HM65 chipset, and a graphics subsystem with UMA video memory (includes replacement thermal material) 636374-001 System board for use only with computer models equipped with an Intel processor, HM65 chipset, and a graphics subsystem with 512-MB of discrete video memory (includes replacement thermal material) 636375-001 System board for use only with computer models equipped with an Intel processor, HM65 chipset, and a graphics subsystem with 512-MB of discrete video memory (includes replacement thermal material) 636376-001 Keyboard with black finish for use in the United States (includes cable) 636376-121 Keyboard with black finish for use in Canada (includes cable) 636376-161 Keyboard with black finish for use in Latin America (includes cable) 636376-171 Keyboard with black finish for use in Saudi Arabia only with computer models equipped with an Intel processor (includes cable) 636376-201 Keyboard with black finish for use in Brazil (includes cable) 636376-281 Keyboard with black finish for use in Thailand (includes cable) 636376-291 Keyboard with black finish for use in Japan (includes cable) 636376-AB1 Keyboard with black finish for use in Taiwan (includes cable) 636376-AD1 Keyboard with black finish for use in South Korea (includes cable) 636376-D61 Keyboard with black finish for use in India only with computer models equipped with an Intel processor (includes cable) 636634-001 AMD V160 2.40-GHz processor (512-KB L2 cache, 1066-MHz 3.2-GT/sec, single core, 25W; includes replacement thermal material) 636635-001 AMD Athlon II P360 2.30-GHz processor (1.0-MB L2 cache, 1066-MHz, 3.2GT/ sec, dual core, 25W; includes replacement thermal material) Sequential part number listing 35
Spare part number Description 637189-001 System board for use only with computer models equipped with an Intel processor, HM55 chipset, and a graphics subsystem with UMA video memory (includes replacement thermal material) 637190-001 System board for use only with computer models equipped with an Intel processor, HM55 chipset, and a graphics subsystem with discrete video memory (includes replacement thermal material) 637193-001 RTC battery (includes cable and double-sided tape) 637197-001 Webcam/microphone module 637312-001 640-GB, 5400-rpm hard drive (2.5-in, SATA, does not include isolators or shield) 638037-001 Intel Core i3-2310M 2.10-GHz processor (3-MB L3 cache, dual core, 35W; includes replacement thermal material) 638039-001 Intel Core i5-2410M 2.30-GHz (SC turbo up to 2.90-GHz) processor (3-MB L3 cache, dual core, 35W; includes replacement thermal material) 638854-001 System board for use only with computer models equipped with an AMD processor and a graphics subsystem with 512-MB of discrete video memory (includes replacement thermal material) 638855-001 System board for use only with computer models equipped with an AMD processor and a graphics subsystem with 1024-MB of discrete video memory (includes replacement thermal material) 638856-001 System board for use only with computer models equipped with an AMD processor and a graphics subsystem with UMA video memory (includes replacement thermal material) 639438-001 Display enclosure in ocean drive finish 639439-001 Base enclosure (includes battery release latch, replacement thermal material, and 4 rubber feet) 639440-001 Display bezel 639441-001 Display Cable Kit (includes display panel cable and webcam/microphone module cable) 639442-001 Cable Kit (includes TouchPad cable, optical drive cable, and hard drive cable) See Cable Kit on page 28 for more Cable Kit spare part information. 639443-001 Power connector cable 639444-001 Hard Drive Hardware Kit (includes hard drive isolators and shield) 639445-001 Display Hinge Kit (includes left and right display hinges and brackets) 639446-001 Display hinge covers 639447-001 14.0-in, HD, LED, BrightView display assembly in ocean drive finish (includes webcam, two microphones, and wireless antenna transceivers and cables) 639448-001 DVD±RW and CD-RW Super Multi Double-Layer Combo Drive (includes bezel and bracket) 639449-001 Blu-ray ROM DVD±R/RW Super Multi Double-Layer Drive (includes bezel and bracket) 639450-001 TouchPad button board (includes cable) 639451-001 Power button board (includes cable) 639452-001 USB board (includes cable) 639453-001 Plastics Kit 639454-001 14.0-in, HD, LED, BrightView display panel 36 Chapter 3 Illustrated parts catalog
Spare part number Description 639455-001 Rubber Feet Kit (includes 4 rubber feet) 639456-001 Screw Kit 639457-001 Display Screw Kit 639458-001 Speaker Kit (includes left and right speakers and cable) 639459-001 Top cover in ocean drive finish (includes TouchPad) 639460-001 Fan (includes replacement thermal material) 639462-001 Heat sink for use only with computer models equipped with an AMD processor and a graphics subsystem with discrete video memory (includes replacement thermal material) 639463-001 Heat sink for use only with computer models equipped with an AMD processor and a graphics subsystem with UMA video memory (includes replacement thermal material) 639736-001 1-GB memory module (DDR3, 10600, 1333-MHz) 640292-001 TouchPad LED board (includes cable) 640293-001 LED board (includes cable) 640294-001 Antenna Kit (includes left and right wireless antenna cables and transceivers) 640926-001 Realtek RTL8191SE 802.11b/g/n 1×1 WiFi Adapter for use with all computer models 641140-001 Heat sink for use only with computer models equipped with an Intel processor, HM65 chipset, and a graphics subsystem with UMA video memory (includes replacement thermal material) 641141-001 Heat sink for use only with computer models equipped with an Intel processor, HM65 chipset, and a graphics subsystem with discrete video memory (includes replacement thermal material) 641328-001 Display enclosure in Sonoma red finish 641329-001 Display enclosure in luminous rose finish 641330-001 Display enclosure in charcoal grey finish 641331-001 Display enclosure in pewter finish 641332-001 Display enclosure in Pacific blue finish 641333-001 Display enclosure in pearl pink finish 641334-001 Display enclosure in sweet purple finish 641335-001 Display enclosure in butter gold finish 641336-001 14.0-in, HD, LED, BrightView display assembly in Sonoma red finish (includes webcam, two microphones, and wireless antenna transceivers and cables) 641337-001 14.0-in, HD, LED, BrightView display assembly in luminous rose finish (includes webcam, two microphones, and wireless antenna transceivers and cables) 641338-001 14.0-in, HD, LED, BrightView display assembly in charcoal gray finish (includes webcam, two microphones, and wireless antenna transceivers and cables) 641339-001 14.0-in, HD, LED, BrightView display assembly in pewter finish (includes webcam, two microphones, and wireless antenna transceivers and cables) 641340-001 14.0-in, HD, LED, BrightView display assembly in Pacific blue finish (includes webcam, two microphones, and wireless antenna transceivers and cables) 641341-001 14.0-in, HD, LED, BrightView display assembly in pearl pink finish (includes webcam, two microphones, and wireless antenna transceivers and cables) Sequential part number listing 37
Spare part number Description 641342-001 14.0-in, HD, LED, BrightView display assembly in sweet purple finish (includes webcam, two microphones, and wireless antenna transceivers and cables) 641343-001 14.0-in, HD, LED, BrightView display assembly in butter gold finish (includes webcam, two microphones, and wireless antenna transceivers and cables) 641344-001 Top cover in Sonoma red finish (includes TouchPad) 641345-001 Top cover in luminous rose finish (includes TouchPad) 641346-001 Top cover in charcoal gray finish (includes TouchPad) 641347-001 Top cover in pewter finish (includes TouchPad) 641348-001 Top cover in Pacific blue finish (includes TouchPad) 641349-001 Top cover in pearl pink finish (includes TouchPad) 641350-001 Top cover in sweet purple finish (includes TouchPad) 641351-001 Top cover in butter gold finish (includes TouchPad) 644351-001 750-GB, 5400-rpm hard drive (2.5-in, SATA, does not include isolators or shield) 644685-001 500-GB, 7200-rpm hard drive (2.5-in, SATA, does not include isolators or shield) 645089-001 320-GB, 7200-rpm hard drive (2.5-in, SATA, does not include isolators or shield) 645529-001 System board for use only with computer models equipped with an AMD Fusion E-350 1.60- GHz processor (dual core, 18 W) and a graphics subsystem with UMA video memory (includes replacement thermal material) 645893-001 Keyboard with silver finish for use in the United States (includes keyboard cable) 645893-121 Keyboard with silver finish for use in Canada (includes keyboard cable) 645893-161 Keyboard with silver finish for use in Latin America (includes keyboard cable) 645893-171 Keyboard with black finish for use in Saudi Arabia only with computer models equipped with an Intel processor (includes cable) 645893-201 Keyboard with silver finish for use in Brazil (includes keyboard cable) 645893-281 Keyboard with silver finish for use in Thailand (includes keyboard cable) 645893-291 Keyboard with silver finish for use in Japan (includes keyboard cable) 645893-AB1 Keyboard with silver finish for use in Taiwan (includes keyboard cable) 645893-AD1 Keyboard with silver finish for use in South Korea (includes keyboard cable) 645893-D61 Keyboard with silver finish for use in India for use only with computer models equipped with an Intel processor (includes keyboard cable) 647626-001 System board for use only with computer models equipped with the AMD RS880MD chipset, an AMD processor, and a graphics subsystem with 512-MB of discrete video memory, and supports bus alive/chip off (BACO; includes replacement thermal material) 647627-001 System board for use only with computer models equipped with the AMD RS880MD chipset, an AMD processor, and a graphics subsystem with 1024-MB of discrete video memory, and upports bus alive/chip off (BACO; includes replacement thermal material) 649948-001 System board for use only with computer models equipped with the AMD A60M chipset, an AMD processor, and a graphics subsystem with UMA video memory (includes replacement thermal material) 38 Chapter 3 Illustrated parts catalog
Spare part number Description 649949-001 System board for use only with computer models equipped with the AMD A60M chipset, an AMD processor, and a graphics subsystem with 512-MB of discrete video memory (includes replacement thermal material) 649950-001 System board for use only with computer models equipped with the AMD A60M chipset, an AMD processor, and a graphics subsystem with 1024-MB of discrete video memory (includes replacement thermal material) 649952-001 Heat sink for use only with computer models equipped with the AMD RS880MD chipset, an AMD processor, and a graphics subsystem with discrete video memory (includes replacement thermal material) 649953-001 Heat sink for use only with computer models equipped with the AMD A60M chipset, an AMD processor, and a graphics subsystem with discrete video memory (includes replacement thermal material) 649954-001 Heat sink for use only with computer models equipped with the AMD A60M chipset, an AMD processor, and a graphics subsystem with UMA video memory (includes replacement thermal material) 650198-001 System board for use only with computer models equipped with the Intel HM65 chipset, an Intel processor, and a graphics subsystem with 512-MB of discrete video memory (includes replacement thermal material) 650199-001 System board for use only with computer models equipped with the Intel HM65 chipset, an Intel processor, and a graphics subsystem with 1024-MB of discrete video memory (includes replacement thermal material) 653337-001 Intel Pentium B940 TJ85 2.00-GHz processor (2.0-MB L3 cache, dual core, 35 W; includes replacement thermal material) 653338-001 Intel Pentium B950 TJ85 2.10-GHz processor (2.0-MB L3 cache, dual core, 35 W; includes replacement thermal material) 653339-001 Intel Core i3-2330M 2.20-GHz processor (1333-MHz FSB, 3.0-MB L3 cache, dual core, 35 W; includes replacement thermal material) 653340-001 Intel Core i3-2350M 2.30-GHz processor (1333-MHz FSB, 3.0-MB L3 cache, dual core, 35 W; includes replacement thermal material) 653341-001 Intel Core i5-2430M 2.40-GHz processor (turbo up to 3.00-GHz; 1333-MHz, 3.0-MB L3 cache, dual core, 35 W; includes replacement thermal material) 653348-001 AMD A4-3300M 2.50-GHz processor (1.9-GHz FSB, 4.0-MB L2 cache, dual core, 35 W; includes replacement thermal material) 653349-001 AMD A6-3400M 2.30-GHz processor (1.4-GHz FSB, 4.0-MB L2 cache, quad core, 35 W; includes replacement thermal material) 653350-001 AMD A8-3500M 2.40-GHz processor (1.5-GHz FSB, 4.0-MB L2 cache, quad core, 35 W; includes replacement thermal material) 653351-001 or 677628-001AMD E2-3000M 2.40-GHz processor (1.8-GHz FSB, 4.0-MB L2 cache, quad core, 35 W) 654117-001 System board for use only with computer models equipped with the Intel HM55 chipset, an Intel processor, and a graphics subsystem with 512-MB of discrete video memory (includes replacement thermal material) 654118-001 System board for use only with computer models equipped with the Intel HM55 chipset, an Intel processor, and a graphics subsystem with UMA video memory (includes replacement thermal material) Sequential part number listing 39
Spare part number Description 654119-001 Heat sink for use only with computer models equipped with the Intel HM65 or HM55 chipset, an Intel processor, and a graphics subsystem with discrete video memory (includes replacement thermal material) 654120-001 Heat sink for use only with computer models equipped with the Intel HM65 or HM55 chipset, an Intel processor, and a graphics subsystem with UMA video memory (includes replacement thermal material) 655795-001 Atheros 9485GN 802.11b/g/n 1×1 WiFi and 3012 Bluetooth 4.0 Combo Adapter for use with all computer models 656120-001 Ralink RT3090BC4 802.11b/g/n 1×1 WiFi and Bluetooth 2.1+EDR Combo Adapter (BT3.0+HS ready) for use only with computer models equipped with an Intel processor 657325-001 Broadcom 4313GN 802.11b/g/n 1×1 WiFi and 20702 Bluetooth 4.0 Combo Adapter for use with all computer models 659618-001 Optical drive bay space saver 659847-001 DVD±RW and CD-RW Super Multi Double-Layer Combo Drive 659848-001 Blu-ray ROM DVD±R/RW Super Multi Double-Layer Drive 659871-001 System board for use only with computer models equipped with an AMD Fusion E-450 1.65- GHz processor (dual core, 18 W) and a graphics subsystem with UMA video memory (includes replacement thermal material) 664662-001 Intel Pentium B960 TJ85 2.20-GHz processor (2.0-MB L3 cache, dual core, 35 W; includes replacement thermal material) 666173-001 Intel Core i7-2640M 2.80-GHz (SC turbo up to 3.50-GHz) processor (4-MB L3 cache, dual core, 35 W; includes replacement thermal material) 669686-001 AMD A4-3320M 2.60-GHz processor (2.0-GHz FSB, 4.0-MB L2 cache, dual core, 35 W; includes replacement thermal material) 669688-001 AMD A6-3420M 2.40-GHz processor (1.5-GHz FSB, 4.0-MB L2 cache, quad core, 35 W; includes replacement thermal material) 669690-001 AMD A8-3520M 2.50-GHz processor (1.6-GHz FSB, 4.0-MB L2 cache, quad core, 35 W; includes replacement thermal material) 672093-001 AMD A4-3305M 2.50-GHz processor (1.9-GHz FSB, 4.0-MB L2 cache, dual core, 45 W; includes replacement thermal material) 676209-001 System board for use only with computer models equipped with the Intel HM65 chipset and a graphics subsystem with 1024-MB of discrete video memory and NVIDIA GeForce GT 520M 676359-001 Intel Core i5-2450M 2.50-GHz processor (turbo up to 3.10-GHz; 1333-MHz, 3.0-MB L3 cache, dual core, 35 W; includes replacement thermal material) 676785-001 Intel Pentium B970 2.30-GHz processor (2.0-MB L3 cache, dual core, 35 W; includes replacement thermal material) 677152-001 Intel Core i3-2370M 2.40-GHz processor (turbo up to 3.00-GHz; 1333-MHz, 3.0-MB L3 cache, dual core, 35 W; includes replacement thermal material) 677166-001 Display enclosure for use in black models 677167-001 Display assembly for use in black models 677168-001 Top cover for use in black models (includes touchpad) 681045-001 System board for use only with computer models equipped with the Intel HM65 chipset and a graphics subsystem with 1024-MB of discrete video memory and NVIDIA GeForce GT 610M 40 Chapter 3 Illustrated parts catalog
4 Removal and replacement procedures Preliminary replacement requirements Tools required You will need the following tools to complete the removal and replacement procedures: ●Flat-bladed screwdriver ●Magnetic screwdriver ●Phillips P0 and P1 screwdrivers Service considerations The following sections include some of the considerations that you must keep in mind during disassembly and assembly procedures. NOTE: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 CAUTION: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 CAUTION:When servicing the computer, be sure that cables are placed in their proper locations during the reassembly process. Improper cable placement can damage the computer. 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. Be sure 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. Preliminary replacement requirements 41
Drive handling CAUTION:Drives are fragile components that must be handled with care. To prevent damage to the computer, damage to a drive, or loss of information, observe these 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 handling a drive, be sure that you are discharged of static electricity. While handling a drive, avoid touching the connector. Before removing a diskette drive or optical drive, be sure that a diskette or disc is not in the drive and be sure that the optical drive tray is closed. 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, an optical drive, or a diskette drive, place it in a static-proof bag. Avoid exposing an internal 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.” Grounding guidelines Electrostatic discharge damage 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, ESD contains enough power to alter device parameters or melt silicon junctions. A discharge of static electricity from a finger or other conductor can destroy static-sensitive devices or microcircuitry. Even if the spark is neither felt nor heard, damage may have occurred. An electronic device exposed to ESD 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. CAUTION:To prevent damage to the computer when you are removing or installing internal components, observe these precautions: Keep components in their electrostatic-safe containers until you are ready to install them. Before touching an electronic component, discharge static electricity by using the guidelines described in this section. Avoid touching pins, leads, and circuitry. Handle electronic components as little as possible. If you remove a component, place it in an electrostatic-safe container. The following table shows how humidity affects the electrostatic voltage levels generated by different activities. 42 Chapter 4 Removal and replacement procedures