User manual COMPAQ DESKPRO EX DESKTOP MODELS MAINTENANCE AND SERVICE GUIDE

[. . . ] Maintenance & Service Guide Compaq Deskpro EX Series of Personal Computers Desktop Models Maintenance & Service Guide Compaq Deskpro EX Series of Personal Computers Desktop Models Notice © 2000 Compaq Computer Corporation. Except for use in connection with the accompanying Compaq product, no part of this guide may be photocopied or reproduced in any form without prior written consent from Compaq Computer Corporation. Patent and Trademark Office are trademarks of Compaq Information Technologies Group, L. P. Microsoft, Windows, Windows NT, and other names of Microsoft products referenced herein are trademarks or registered trademarks of Microsoft Corporation. [. . . ] In all cases, avoid bending or twisting the cables, and ensure that the cables are routed in such a way that they cannot be caught or snagged by parts being removed or replaced. CAUTION: When servicing this computer, ensure that cables are placed in their proper location during the reassembly process. Improper cable placement can damage the computer. 3. 3. 5 Hard Drives Handle hard drives as delicate precision components, avoiding all physical shock and vibration. ! If a drive must be mailed, place the drive in a bubble-pack mailer or other suitable protective packaging and label the package "Fragile: Handle With Care. " Do not remove hard drives from the shipping package for storage. Keep hard drives in their protective packaging until they are actually mounted in the CPU. Do not remove a hard drive while the computer is on or in standby mode. Before handling a drive, ensure that you are discharged of static electricity. For more information about preventing electrostatic damage, refer to Section 3. 1, "Electrostatic Discharge. " Do not use excessive force when inserting a drive. Avoid exposing a hard drive to liquids, temperature extremes, or products that have magnetic fields such as monitors or speakers. !! 3. 3. 6 Lithium Coin Cell Battery The battery that comes with the computer provides power to the real-time clock and has a minimum lifetime of about three years. See Chapter 4, "Removal and Replacement Procedures, " for instructions on the replacement procedures. ! WARNING: This computer contains a lithium battery. There is a risk of fire and chemical burn if the battery is handled improperly. Do not disassemble, crush, puncture, short external contacts, dispose in water or fire, or expose it to temperatures higher than 140ºF (60ºC). CAUTION: Batteries, battery packs, and accumulators should not be disposed of together with the general household waste. 3-6 Removal & Replacement Preliminaries chapter 4 REMOVAL AND REPLACEMENT PROCEDURES This chapter provides general service information for the computer. Adherence to the procedures and precautions described in this chapter is essential for proper service. After completing all necessary removal and replacement procedures, run the Diagnostics utility to verify that all components operate properly. 4. 1 Disassembly Sequence Chart Use the chart below to determine the disassembly sequence for removing components from the computer. 4. 3 Computer Cover 4. 4 Front Bezel 4. 5 Bezel Blank 4. 6 Power/LED Switch 4. 7. 1 Removing the Internal Side-Mounted 3. 5-Inch Hard Drive 4. 7. 2 Removing an External 5. 25-Inch Drive from Right Drive Bay 4. 7. 3 Removing the Diskette Drive 4. 7. 4 Removing an External 3. 5-Inch Drive from Left Drive Bay 4. 8 System Memory 4. 9 Removing an Expansion Board 4. 10 4. 11 4. 12 4. 13 4. 14 4. 15 Graphics Cards Processor System Board Lithium Battery Power Supply Chassis Fan These steps are interdependent. Compaq Deskpro EX Series of Personal Computers 4-1 4. 2 Disassembly Preparation Before adding any internal options or performing a removal/replacement: 1. Turn off the computer and any peripheral devices that are connected to it. WARNING: Power is continuous to the system board and power supply even when the power switch is turned off. To prevent damage to the unit, disconnect the power cord from the power source or the unit before beginning disassembly procedures. Disconnect the power cord from the electrical outlet and then from the computer. Disconnect all peripheral device cables from the computer. During disassembly, label each cable as you remove it, noting its position and routing. Keep all screws with the components removed. CAUTION: The screws used in the computer are of different thread sizes and lengths; using the wrong screw in an application may damage the unit. WARNING: To reduce the risk of personal injury from hot surfaces, allow the internal system components to cool before touching. CAUTION: Static electricity can damage the electronic components of the computer or optional equipment. [. . . ] Dispose of or recycle them by using the public collection system or returning them to Compaq, your authorized Compaq partners, or their agents. Compaq Deskpro EX Series of Personal Computers 4-27 4. 14 Power Supply 1. Prepare the computer for disassembly (Section 4. 2). WARNING: Power is continuous to the system board and power supply even when the power switch is turned off. To prevent damage to the unit, disconnect the power cord from the power source or the unit before beginning disassembly procedures. 2. Disconnect all power cables from the mass storage devices and the system board. Power connectors are keyed for correct installation. [. . . ]