User manual COMPAQ DESKPRO EXS MINITOWER MODELS - MAINTENANCE AND SERVICE GUIDE

Maintenance & Service Guide Compaq Deskpro EX and Deskpro EXS Series of Personal Computers Minitower Models Maintenance & Service Guide Compaq Deskpro EX and Deskpro EXS Series of Personal Computers Minitower 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. COMPAQ, the Compaq logo, and Deskpro Registered in U.S. 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. Intel and Pentium are registered trademarks of Intel Corporation. Celeron and MMX are trademarks of Intel Corporation. All other product names mentioned herein may be trademarks or registered trademarks of their respective companies. Compaq shall not be liable for technical or editorial errors or omissions contained herein. The information in this document is subject to change without notice. THE INFORMATION IN THIS PUBLICATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. THE ENTIRE RISK ARISING OUT OF THE USE OF THIS INFORMATION REMAINS WITH RECIPIENT. IN NO EVENT SHALL COMPAQ BE LIABLE FOR ANY DIRECT, CONSEQUENTIAL, INCIDENTAL, SPECIAL, PUNITIVE OR OTHER DAMAGES WHATSOEVER (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS, BUSINESS INTERRUPTION OR LOSS OF BUSINESS INFORMATION), EVEN IF COMPAQ HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES AND WHETHER IN AN ACTION OF CONTRACT OR TORT, INCLUDING NEGLIGENCE. The limited warranties for Compaq products are exclusively set forth in the documentation accompanying such products. Nothing herein should be construed as constituting a further or additional warranty. The following words and symbols mark special messages throughout this guide: WARNING: Text set off in this manner indicates that failure to follow directions could result in bodily harm or loss of life. CAUTION: Text set off in this manner indicates that failure to follow directions could result in damage to equipment or loss of information. Maintenance & Service Guide Compaq Deskpro EX and Deskpro EXS Series of Personal Computers Minitower Models First Edition (September 2000) Part Number 201856-001 Spare Parts Number 215879-001 Compaq Computer Corporation CONTENTS preface About This Guide Symbols and Conventions.........................................................................................................vii Technician Notes.......................................................................................................................vii Locating Additional Information .............................................................................................viii chapter 1 Product Description 1.1 Computer Features.......................................................................................................... 1-2 1.1.1 Front Panel Controls and LEDs ......................................................................... 1-2 1.1.2 Rear Panel Connectors ....................................................................................... 1-3 1.1.3 Drive Positions ................................................................................................... 1-4 1.2 Serial Number Location.................................................................................................. 1-5 chapter 2 Spare Parts 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 System Unit .................................................................................................................... 2-2 Mass Storage Devices..................................................................................................... 2-3 Cables ............................................................................................................................. 2-4 Standard, Memory, and Expansion Boards .................................................................... 2-5 Miscellaneous Plastics Kit .............................................................................................. 2-6 Keyboards (not illustrated) ............................................................................................. 2-7 Miscellaneous Screw Kit (not illustrated)....................................................................... 2-7 Miscellaneous Parts (not illustrated)............................................................................... 2-8 Shipping Boxes (not illustrated) ..................................................................................... 2-8 Documentation and Software (not illustrated)................................................................ 2-8 chapter 3 Removal and Replacement Preliminaries 3.1 Electrostatic Discharge Information ............................................................................... 3-1 3.1.1 Generating Static................................................................................................ 3-1 3.1.2 Preventing Electrostatic Damage to Equipment................................................. 3-2 3.1.3 Personal Grounding Methods and Equipment ................................................... 3-2 3.1.4 Grounding Workstations .................................................................................... 3-2 3.1.5 Recommended Materials and Equipment........................................................... 3-3 3.2 Routine Care ................................................................................................................... 3-3 3.2.1 General Cleaning Safety Precautions ................................................................. 3-3 3.2.2 Cleaning the Computer Case.............................................................................. 3-4 3.2.3 Cleaning the Keyboard....................................................................................... 3-4 3.2.4 Cleaning the Monitor ......................................................................................... 3-4 3.2.5 Cleaning the Mouse............................................................................................ 3-5 Contents iii 3.3 Service Considerations ................................................................................................... 3-5 3.3.1 Power Supply Fan .............................................................................................. 3-5 3.3.2 Tools and Software Requirements ..................................................................... 3-5 3.3.3 Screws ................................................................................................................ 3-5 3.3.4 Cables and Connectors ....................................................................................... 3-6 3.3.5 Hard Drives ........................................................................................................ 3-6 3.3.6 Lithium Coin Cell Battery.................................................................................. 3-6 chapter 4 Removal and Replacement Procedures 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10 Disassembly Sequence Chart.......................................................................................... 4-1 Disassembly Preparation................................................................................................. 4-2 Feet Installation .............................................................................................................. 4-3 Cable Lock...................................................................................................................... 4-4 Access Panel ................................................................................................................... 4-5 Front Bezel ..................................................................................................................... 4-6 Power Button .................................................................................................................. 4-7 Subpanel and Bezel Blanks............................................................................................. 4-8 Power Switch Assembly ................................................................................................. 4-9 Mass Storage Devices................................................................................................... 4-10 4.10.1 Removing an Internal 3.5-Inch Hard Drive ..................................................... 4-12 4.10.2 Removing an External 5.25-Inch Drive ........................................................... 4-13 4.10.3 Removing an External 3.5-Inch Drive ............................................................. 4-14 Expansion Boards ......................................................................................................... 4-16 4.11.1 Expansion Board Slots ..................................................................................... 4-16 4.11.2 Removing a PCI Expansion Board................................................................... 4-17 4.11.3 Installing a PCI Expansion Board .................................................................... 4-18 System Memory............................................................................................................ 4-20 Graphics Cards.............................................................................................................. 4-22 4.13.1 Graphics Performance Accelerator (GPA)/AGP Inline Memory Module (AIMM) Card with a Type I Retention Mechanism .................................... 4-22 4.13.2 AGP Card with a Type I Retention Mechanism............................................... 4-25 4.13.3 GPA/AIMM Card with a Type 2 Retention Mechanism.................................. 4-26 4.13.4 AGP Card with a Type 2 Retention Mechanism .............................................. 4-27 4.13.5 Standard AGP Expansion Card ........................................................................ 4-28 Processor....................................................................................................................... 4-29 System Board................................................................................................................ 4-31 Battery .......................................................................................................................... 4-32 Chassis Fan Assembly .................................................................................................. 4-33 Power Supply................................................................................................................ 4-34 4.11 4.12 4.13 4.14 4.15 4.16 4.17 4.18 chapter 5 Connectors & Jumpers 5.1 System Board.................................................................................................................. 5-1 5.1.1 Connectors and Jumpers .................................................................................... 5-1 5.1.2 Clearing CMOS.................................................................................................. 5-2 5.1.3 Disabling or Clearing the Power-On and Setup Passwords ............................... 5-3 5.2 Hard Drive Jumper Settings............................................................................................ 5-4 5.2.1 Seagate, Quantum, and Western Digital ............................................................ 5-4 5.2.2 Maxtor................................................................................................................ 5-5 iv Contents chapter 6 Specifications 6.1 Specifications.................................................................................................................. 6-1 6.1.1 System ................................................................................................................ 6-1 6.1.2 System Interrupts ............................................................................................... 6-2 6.1.3 System DMA...................................................................................................... 6-2 6.1.4 ICH Fixed I/O Registers..................................................................................... 6-3 6.1.5 System Memory Map ......................................................................................... 6-5 6.2 Drives.............................................................................................................................. 6-6 6.2.1 1.44-MB Diskette Drive..................................................................................... 6-6 6.2.2 Ultra ATA Hard Drives...................................................................................... 6-7 6.2.3 CD-ROM Drives ................................................................................................ 6-8 6.3 Compaq Keyboard .......................................................................................................... 6-9 6.4 Scroll Mouse................................................................................................................... 6-9 6.5 Supported Graphics Resolutions................................................................................... 6-10 6.5.1 Intel 3D Graphics ............................................................................................. 6-10 6.5.2 nVIDIA M64 Pro ............................................................................................. 6-10 index .............................................................................................................................................. I-1 Contents v preface ABOUT THIS GUIDE This Maintenance & Service Guide is a troubleshooting and repair guide that can be used for reference when servicing the Compaq Deskpro EX Series of Personal Computers Minitower Model. Only authorized technicians trained by Compaq should attempt to repair this equipment. Compaq Computer Corporation reserves the right to make changes to the these models without notice. Symbols and Conventions The following text and symbols mark special messages throughout this guide: ! WARNING: Text set off in this manner indicates that failure to follow directions in the warning could result in bodily harm or loss of life. CAUTION: Text set off in this manner indicates that failure to follow directions could result in damage to equipment or loss of data. Text set off in this manner presents commentary, sidelights, clarifying information, or specific instructions. Technician Notes ! WARNING: Only authorized technicians trained by Compaq should attempt to repair this equipment. All troubleshooting and repair procedures are detailed to allow only subassembly/module level repair. Because of the complexity of the individual boards and subassemblies, no one should attempt to make repairs at the component level or to make modifications to any printed wiring board. Improper repairs can create a safety hazard. Any indications of component replacement or printed wiring board modifications may void any warranty. WARNING: To reduce the risk of electric shock or damage to the equipment: · · · Do not disable the power grounding plug. The grounding plug is an important safety feature. Plug the power cord into a grounded (earthed) electrical outlet that is easily accessible at all times. Disconnect the power from the computer by unplugging the power cord either from the electrical outlet or the computer. ! CAUTION: To properly ventilate your system, you must provide at least 3 inches (7.6 cm) of clearance at the front and back of the computer. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers vii Locating Additional Information The following documentation is available to support these products: s User Documentation s Technical Training Guides s Compaq Service Advisories and Bulletins s Compaq QuickFind s Technical Reference Guide s Compaq Quick Reference Guide s Compaq Service Reference Guide s Compaq Quick Troubleshooting Guide viii About This Guide chapter 1 PRODUCT DESCRIPTION This chapter describes the model offerings and features of the Compaq Deskpro EX Series of Personal Computers Minitower Model. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 1-1 1.1 Computer Features Compaq Deskpro EX Series of Personal Computers Minitower Model ships with a mouse and keyboard. Some models are also equipped with a CD-ROM drive. A Compaq color monitor or other compatible monitor does not ship with the computer. 1.1.1 Front Panel Controls and LEDs Ref. Component/Function 1 2 3 4 5 Stereo Headphone Jack* Headphone Volume Control* Diskette Drive Activity Light Dual-State Power Button Power-On Light Ref. 6 7 8 9 Component/Function CD-ROM Eject Button* CD-ROM Drive Busy Indicator* Diskette Eject Button Drive Activity Light** *CD-ROM models only. **Flashes when an ATAPI device, such as the hard drive, is active. 1-2 Product Description 1.1.2 Rear Panel Connectors Ref. Component 1 2 3 Mouse Connector Keyboard Connector Universal Serial Bus (USB) Connectors (2) (connects the computer to any USB peripheral while the computer is operating; is a fully functional plug and play connector) Serial Connector Parallel Port Connector Ref. 6 7 8 Component Monitor Connector Headphone/Line-Out Audio Connector Serial Connector 4 5 9 : Line-In Audio Connector Microphone Connector Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 1-3 1.1.3 Drive Positions Reference Drive Bay 1, 2 3 4, 5 1, 2 3 4, 5 Configuration Two standard 5.25-inch, half-height bays for optional drives One standard 3.5-inch, 1.44-MB diskette drive mounted with a drive adapter into a 5.25-inch bay Two standard 3.5-inch drive bays; Bay 4 contains the preinstalled hard drive; Bay 5 is available for an optional hard drive Drive bay numbers are stamped on the chassis. To verify the type and size of the mass storage devices installed in the computer, run F10 Compaq Computer Setup. 1-4 Product Description 1.2 Serial Number Location The serial number and model information label is located on the access panel of the unit 1. A second barcode label is located on the rear of the unit 2. For the purpose of AssetControl, the serial number is embedded in CMOS and in the EEPROM on the system board and may be accessed through Diagnostics for Windows. If the system board is replaced with a spare part from Compaq, the invalid serial number condition will be recognized during POST. The original serial number must then be reentered through Computer Setup. Refer to the Software Reference Guide for more information. CAUTION: A system board borrowed from another computer is recognized as a valid serial number and will create a mismatch between the serial number label and the electronic serial number. The computer serial number should be provided to Compaq when requesting information or ordering spare parts. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 1-5 chapter 2 SPARE PARTS Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 2-1 2.1 System Unit Description 1 2 3 4 5 6 7 Access panel Front bezel Chassis/basepan Logo Kit (only minitower version-166806-002-used) Power switch with cable, LED and switch holder Feet Power supply Spare Part Number Not spared 166868-001 Not spared 166924-001 199854-001 Misc Plastics Kit 201828-001 Warranty Tier B B B B 2-2 Spare Parts 2.2 Mass Storage Devices Description 1 2 3 * Diskette drive, 3.5-inch 48X Max tray load IDE CD-ROM drive 10.0-GB Ultra ATA hard drive (66/5400) quiet 15.0-GB Ultra ATA hard drive (66/5400) Spare Part Number 158266-001 187263-001 203139-001 202903-001 Warranty Tier D B B B *Not shown (nn/nnnn) = hard drive transfer rate (MBytes/sec)/RPM Ultra ATA/100 hard drives are backwards compatible with Ultra ATA/66 devices; however, the data transfer rate is reduced to 66MB/sec. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 2-3 2.3 Cables Description Cable Kit includes: 1 2 * * 3 4 5 6 * Single device, hard drive/CD-ROM cable, 18" (108950-019) Audio cable, 21" (387527-001) Single device, hard drive/CD-ROM cable, 12.5" (105876-001) Audio cable, 21", (288489-002) (not used for this product) Single device, hard drive/CD-ROM cable, 9.75" (108950-021) Dual device, hard drive/CD-ROM cable, 18", 10" to the first connector Power switch/LED cable Diskette drive cable CD audio cable Spare Part Number 192264-001 Warranty Tier B 196667-001 199854-001 161735-001 149806-001 B B B D *Not shown 2-4 Spare Parts 2.4 Standard, Memory, and Expansion Boards Description 1 Nvidia M64 16MB SDRAM AGP Card 5 AIMM (GPA) 4MB, 133MHz for graphics Memory Module (SDIMM, 133 MHz) 2 128 MB 256 MB Intel Pentium III Processor 3 * * * * * * * 566/66 MHz with heatsink (191832-002) and clip (223575-007). 600/66 MHz with heatsink (191832-002) and clip (223575-007). 667/133 MHz with heatsink (191832-002) and clip (223575-007). 700/66 MHz with heatsink (191832-002) and clip (223575-007). 733/133 MHz with heatsink (191832-002) and clip (223575-007). 800/133 MHz with heatsink (191832-002) and clip (223575-007). 866/133 MHz with fansink (191845-002). Fansink includes fan, heatsink, and clip. 933/133 MHz with fansink (191845-002). Fansink includes fan, heatsink, and clip. Spare Part Number 182757-001 192012-001 170081-001 192014-001 203967-001 192011-001 192007-001 203968-001 192008-001 192009-001 192006-001 203969-001 188297-001 203966-001 Warranty Tier B B B B B B B B B B B B B B 4 10/100 PCI Network Interface Card 6 System Board *Not shown. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 2-5 2.5 Miscellaneous Plastics Kit Description Miscellaneous Plastics Kit, includes: 1 2 3 4 5 6 7 8 9 * Panel, sub (166835-001) Bezel, blank (166775-001) Diskette bezel (166776-001) Card guide (166778-001) Foot, rubber (4 ea.) (166939-002) Button, power (166774-001) Drivelock, DT (166779-001) (not used with this product) Spring, power button (166837-001) Springs, drivelock (2 ea.) (166837-002) Retention mechanism (2 ea.) (350767-001) Spare Part Number 166878-001 Warranty Tier B 10 Drivelock, MT (166780-001) *Not shown 2-6 Spare Parts 2.6 Keyboards (not illustrated) Description Easy Access Keyboard-US Dutch Finnish French International Norwegian Spanish Swedish UK US Spare Part Number 123130-xxx -331 -351 -051 -B31 -091 -071 -101 -031 -001 Warranty Tier D 2.7 Miscellaneous Screw Kit (not illustrated) Description Miscellaneous Screw Kit, includes: 6-32 x 1/4 hi-top, thread-forming screw with serrations (5 ea.) (192308-001) 6-19 x 5/16 panhead, plastite screw (4 ea.) (101346-068) 6-19 x .5/16 hi-top, taptite screw with captive washer (4 ea.) (114399-069) 6-32 x 3/16 hi-top, thread-forming screw with serrations (5 ea.) (192308-003) M3 x 5mm, hi-top, taptite screw with serrations (4 ea.) (247348-001) 6-32 x 3/16 buttonhead tamper-resistant, taptite screw with serrations (3 ea.) (296769-002) 6-32 x 5/16 hi-top, taptite screw (4 ea.) (109834-568) 6-19 x 1/2 Panhead, plastite screw (5 ea.) (101346-071) Thumbscrew, molded cap (4 ea.) (179333-002) Spare Part Number 179180-001 Warranty Tier D Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 2-7 2.8 Miscellaneous Parts (not illustrated) Description Mouse ­ Scroll, Opal Spare Part Number 334689-002 Warranty Tier D 2.9 Shipping Boxes (not illustrated) Description Return Kit Spare Part Number 166990-002 2.10 Documentation and Software (not illustrated) Description Maintenance & Service Guide Illustrated Parts Map Service Reference Guide Quick Troubleshooting Guide Spare Part Number 215879-001 215880-001 152611-001 153837-001 2-8 Spare Parts chapter 3 CAUTION: When the computer is plugged into an AC power source there is always voltage applied to the system board. You must disconnect the power cord from the power source before opening the computer to prevent system board or component damage. REMOVAL & REPLACEMENT PRELIMINARIES This chapter provides general service information for the computer. Adherence to the procedures and precautions described in this chapter is essential for proper service. 3.1 Electrostatic Discharge Information A sudden discharge of static electricity from your 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 (ESD) may not be affected at all and can work perfectly throughout a normal cycle. The device may function normally for a while, then degrade in the internal layers, reducing its life expectancy. 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. 3.1.1 Generating Static The following table shows that: ! ! Different activities generate different amounts of static electricity. Static electricity increases as humidity decreases. Relative Humidity 55% 40% 10% 7,500 V 3,000 V 400 V 400 V 2,000 V 3,500 V 7,000 V 5,000 V 15,000 V 5,000 V 800 V 700 V 4,000 V 5,000 V 20,000 V 11,000 V 35,000 V 12,000 V 6,000 V 2,000 V 11,500 V 14,500 V 26,500 V 21,000 V Event Walking across carpet Walking across vinyl floor Motions of bench worker Removing DIPs* from plastic tube Removing DIPs* from vinyl tray Removing DIPs* from Styrofoam Removing bubble pack from PCB Packing PCBs in foam-lined box *Dual Inline Packaging (DIP) is the packaging around individual microcircuitry. These are then multi-packaged inside plastic tubes, trays, or Styrofoam. 700 volts can degrade a product. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 3-1 3.1.2 Preventing Electrostatic Damage to Equipment Many electronic components are sensitive to ESD. Circuitry design and structure determine the degree of sensitivity. The following proper packaging and grounding precautions are necessary to prevent damage to electric components and accessories. ! ! ! ! ! ! ! To avoid hand contact, transport products in static-safe containers such as tubes, bags, or boxes. Protect all electrostatic parts and assemblies with conductive or approved containers or packaging. Keep electrostatic sensitive parts in their containers until they arrive at static-free stations. Place items on a grounded surface before removing them from their container. Always be properly grounded when touching a sensitive component or assembly. Avoid contact with pins, leads, or circuitry. Place reusable electrostatic-sensitive parts from assemblies in protective packaging or conductive foam. 3.1.3 Personal Grounding Methods and Equipment Use the following equipment to prevent static electricity damage to equipment: ! Wrist straps are flexible straps with a minimum of one-megohm +/- 10% resistance in the ground cords. To provide proper ground, a strap must be worn snug against bare skin. The ground cord must be connected and fit snugly into the banana plug connector on the grounding mat or workstation. Heel straps/Toe straps/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 them on both feet with a minimum of one-megohm +/- 10% resistance between the operator and ground. ! Static Shielding Protection Levels Method Antistatic plastic Carbon-loaded plastic Metallized laminate Voltage 1,500 7,500 15,000 3.1.4 Grounding Workstations To prevent static damage at the workstation, use the following precautions: ! ! ! ! Cover the workstation with approved static-dissipative material. Provide a wrist strap connected to the work surface and properly grounded tools and equipment. Use static-dissipative mats, foot straps, or air ionizers to give added protection. Handle electrostatic sensitive components, parts, and assemblies by the case or PCB laminate. Handle them only at static-free workstations. Turn off power and input signals before inserting and removing connectors or test equipment. 3-2 Removal & Replacement Preliminaries ! ! ! Use fixtures made of static-safe materials when fixtures must directly contact dissipative surfaces. Keep work area free of nonconductive materials such as ordinary plastic assembly aids and Styrofoam. Use field service tools, such as cutters, screwdrivers, and vacuums, that are conductive. 3.1.5 Recommended Materials and Equipment Materials and equipment that are recommended for use in preventing static electricity include: ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Antistatic tape Antistatic smocks, aprons, or sleeve protectors Conductive bins and other assembly or soldering aids Conductive foam Conductive tabletop workstations with ground cord of one-megohm +/- 10% resistance Static-dissipative table or floor mats with hard tie to ground Field service kits Static awareness labels Wrist straps and footwear straps providing one-megohm +/- 10% resistance Material handling packages Conductive plastic bags Conductive plastic tubes Conductive tote boxes Opaque shielding bags Transparent metallized shielding bags Transparent shielding tubes 3.2 3.2.1 Routine Care General Cleaning Safety Precautions 1. 2. 3. 4. 5. 6. Never use solvents or flammable solutions to clean the computer. Never immerse any parts in water or cleaning solutions; apply any liquids to a clean cloth and then use the cloth on the component. Always turn off the computer when cleaning with liquids or damp cloths. Always turn off the computer before cleaning the keyboard, mouse, or air vents. Disconnect the keyboard before cleaning it. Wear safety glasses equipped with side shields when cleaning the keyboard. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 3-3 3.2.2 Cleaning the Computer Case Follow all safety precautions in Section 3.2.1 before cleaning the computer. To clean the computer case, follow the procedures described below: ! ! ! ! ! To remove light stains or dirt, use plain water with a clean, lint-free cloth or swab. For stronger stains, use a mild dishwashing liquid diluted with water. Rinse well by wiping it with a cloth or swab dampened with clear water. For stubborn stains, use isopropyl (rubbing) alcohol. No rinsing is needed as the alcohol will evaporate quickly and not leave a residue. After cleaning, always wipe the unit with a clean, lint-free cloth. Occasionally clean the air vents on the computer. Lint and other foreign matter can block the vents and limit the airflow. 3.2.3 Cleaning the Keyboard Follow all safety precautions in Section 3.2.1 before cleaning the keyboard. To clean the tops of the keys or the keyboard body, follow the procedures described in Section 3.2.2. When cleaning debris from under the keys, review all rules in Section 3.2.1 before following these procedures: CAUTION: Use safety glasses equipped with side shields before attempting to clean debris from under the keys. ! ! Visible debris underneath or between the keys may be removed by vacuuming or shaking. Canned, pressurized air may be used to clean debris from under the keys. Caution should be used as too much air pressure can dislodge lubricants applied under the wide keys. If you remove a key, use a specially designed key puller to prevent damage to the keys. This tool is available through many electronic supply outlets. CAUTION: Never remove a wide leveled key (like the space bar) from the keyboard. If these keys are improperly removed or installed, the keyboard may not function properly. ! ! Cleaning under a key may be done with a swab moistened with isopropyl alcohol and squeezed out. Be careful not to wipe away lubricants necessary for proper key functions. Use tweezers to remove any fibers or dirt in confined areas. Allow the parts to air dry before reassembly. 3.2.4 Cleaning the Monitor ! Wipe the monitor screen with a clean cloth moistened with water or with a towelette designed for cleaning monitors. Do not use sprays or aerosols directly on the screen, the liquid may seep into the housing and damage a component. Never use solvents or flammable liquids on the monitor. To clean the monitor body follow the procedures in Section 3.2.2. ! 3-4 Removal & Replacement Preliminaries 3.2.5 Cleaning the Mouse Before cleaning the mouse, ensure that the power to the computer is turned off. ! Clean the mouse ball by first removing the retaining plate and the ball from the housing. Pull out any debris from the ball socket and wipe the ball with a clean dry cloth before reassembly. To clean the mouse body, follow the procedures in 3.2.2. ! 3.3 Service Considerations Listed below are some of the considerations that you should keep in mind during the disassembly and assembly of the computer. 3.3.1 Power Supply Fan The power supply fan is a variable-speed fan based on the temperature in the power supply. CAUTION: The cooling fan is off only when the computer is turned off or the power cable has been disconnected. The cooling fan is always on in all other instances (when the computer is either in the "On," "Standby," or "Suspend" mode). You must disconnect the power cord from the power source before opening the computer to prevent system board or component damage. 3.3.2 Tools and Software Requirements To service the computer, you need the following: ! ! ! ! Torx T-15 screwdriver (Compaq screwdriver with bits PN 161946-001) Flat-bladed screwdriver (may sometimes be used in place of the Torx screwdriver) Diagnostics software Compaq tamper-resistant T-15 wrench (Smart Cover FailSafe Key, PN 166527001) or Compaq tamper-resistant bits (Smart Cover FailSafe Key, PN 166527-002) 3.3.3 Screws The screws used in the computer are not interchangeable. They may have standard or metric threads and may be of different lengths. If an incorrect screw is used during the reassembly process, it can damage the unit. Compaq strongly recommends that all screws removed during disassembly be kept with the part that was removed, then returned to their proper locations. As each subassembly is removed from the computer, it should be placed away from the work area to prevent damage. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 3-5 3.3.4 Cables and Connectors Most cables used throughout the unit are flat, flexible cables. These cables must be handled with care to avoid damage. Apply only the tension required to seat or unseat the cables during insertion or removal from the connector. Handle cables by the connector whenever possible. 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. This applies to failed drives as well as replacement spares. ! ! ! ! ! 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. Avoid dropping drives from any height onto any surface. If you are inserting or removing a hard drive, turn off the computer. 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. While handling a drive, avoid touching the connector. 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 4.4 4.5 Feet Installation Cable Lock Access Panel 4.6 Front Bezel 4.7 Power Button 4.8 Subpanel and Bezel Blanks 4.9 Power Switch Assembly 4.10.1 Removing an Internal 3.5-Inch Hard Drive 4.10.2 Removing an External 5.25-Inch Drive 4.10.3 Removing an External 3.5-Inch Drive 4.11 Expansion Boards 4.12 System Memory 4.13 Graphics Cards 4.14 Processor 4.15 System Board 4.16 Lithium Battery 4.17 Chassis Fan Assembly 4.18 Power Supply Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 4-1 4.2 Disassembly Preparation Before adding any internal options or performing a removal/replacement: 1. Remove any diskette, compact disc, or tape from the computer. 2. 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. CAUTION: Turn off the computer before disconnecting any cables. 3. Disconnect the power cord from the electrical outlet and then from the computer. 4. 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. Before beginning these procedures, ensure that you are discharged of static electricity by briefly touching a grounded metal object. For more information, refer to Chapter 3, "Removal and Replacement Preliminaries." 4-2 Removal & Replacement Procedures 4.3 Feet Installation Four (4) rubber feet are mounted to the chassis, as shown below. No parts have to be removed to access the feet. The replacement feet have an adhesive surface and are shipped with a protective backing in place. Remove the backing from the feet before installation. If necessary, remove the old feet and remove any adhesive residue from the chassis. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 4-3 4.4 Cable Lock WARNING: To avoid injury, use care in handling the separated pieces of the cable lock bracket; metal edges may be sharp. Be sure to install the bracket so that sharp edges do not extend from the edges of the computer chassis. Depending on the model, the computer includes a cable lock provision, which consists of a three-piece security bracket. The bottom part of the bracket is attached to the computer with a screw; the top part of the bracket covers the screw and prevents its removal. 1. Separate the pieces of the security bracket by bending the metal where the three pieces join. 2. Slide the tab on the narrow piece of the bracket into the notch on the back of the computer and rotate this piece toward the screw hole, then slide the U-shaped piece of the bracket between the narrow piece and the computer. 3. Position both pieces of the bracket over the screw hole and secure the bracket to the computer with the screw provided. 4. Cover the screw with the flat portion of the security bracket. 5. Install a padlock (not provided) to secure the top part of the security bracket and inhibit access to the inside of the computer. Install a cable lock (not provided) to inhibit access to the interior of the computer and secure the computer to a fixed object. To remove the cable lock provision, reverse the above procedure. 4-4 Removal & Replacement Procedures 4.5 Access Panel 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. Lay the computer down on its large base for greater stability. 3. Loosen the two thumbscrews that secure the access panel to the back of the computer chassis. 4. Slide the access panel backward approximately 1-inch (2.5-cm); then lift it up and off the unit. To replace the access panel, reverse the previous steps. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 4-5 4.6 Front Bezel 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. Remove the access panel (Section 4.5). 3. Press the release tabs 1 on the side of the front bezel. 4. Rotate the front bezel away from the chassis to remove it from the unit 2. When replacing the front bezel, ensure that the bottom hinge points are properly placed in the chassis before rotating the front bezel back into its original position. 4-6 Removal & Replacement Procedures 4.7 Power Button 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. Lay the computer down on its large base for greater stability. 3. Remove the access panel (Section 4.5). 4. Remove the front bezel (Section 4.6). 5. Pinch the two tabs of the power button together and pull the button out of the front bezel. The spring will follow the button out of the housing. To replace the power button, reverse the above procedure. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 4-7 4.8 Subpanel and Bezel Blanks The subpanel and bezel blanks must be removed from the front bezel if you are installing a mass storage device for the first time. 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. 1. Prepare the computer for disassembly (Section 4.2). 2. Lay the computer down on its large base for greater stability. 3. Remove the access panel (Section 4.5). 4. Remove the front bezel (Section 4.6). 5. Pull on the subpanel to remove it from the inside of the front bezel. CAUTION: Hold the subpanel straight when you pull it away from the front bezel. Pulling at an angle could damage the pins that align the subpanel within the front bezel. 6. Gently push on the bezel blanks to remove them from the subpanel. CAUTION: When replacing the subpanel, ensure that the aligning pins and any remaining bezel blanks are in the proper orientation to prevent damage to the alignment pins. The subpanel has markings on it to facilitate installation. 4-8 Removal & Replacement Procedures 4.9 Power Switch Assembly CAUTION: The power switch should not be removed from the switch holder. Doing so may damage the switch components. 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. Lay the computer down on its large base for greater stability. 3. Remove the access panel (Section 4.5). 4. Remove the front bezel (Section 4.6). 5. Disconnect the power/LED cable from the system board 1. 6. Push the release tab 2 toward the drive bays, then remove the power switch assembly from the chassis. To install the new power switch, reverse the above procedure, pushing the switch assembly until it snaps into place. The power/LED connector is keyed to ensure proper installation. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 4-9 4.10 Mass Storage Devices The Compaq Deskpro EX Series of Personal Computers support up to five drives in various configurations. Drive Positions Reference Drive Bay 12 3 45 1, 2 3 4, 5 Configuration Two standard 5.25-inch, half-height bays for optional drives. One standard 3.5-inch, 1.44-MB diskette drive mounted with a drive adapter into a 5.25-inch bay. Two standard 3.5-inch drive bays; bay 4 contains the preinstalled hard drive, bay 5 is available for an optional hard drive. Drive bay numbers are stamped on the chassis. To verify the type and size of the mass storage devices installed in the computer, run Computer Setup. 4-10 Removal & Replacement Procedures When installing additional drives, follow these guidelines: ! For optimal performance, connect hard drives to the primary controller. Connect expansion devices, such as CD-ROM, IDE tape, and diskette drives to the secondary controller. You may install either a third-height or a half-height drive into a half-height bay. You must install guide screws to ensure that the drive lines up correctly in the drive cage. Compaq has provided extra guide screws, which are installed in the front of the computer chassis, behind the front bezel. Some options require metric hardware. Compaq-supplied metric screws are black. 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. ! ! Using the Cable-Select Feature with Ultra ATA Devices Optional drives are available from Compaq in kits that include a special drive cable. The configuration of the drives employs a cable-select feature that identifies the drives as device 0 (primary drive) or device 1 (secondary drive). The system board determines which drive is device 0 or device 1, based on the way the drives are connected to the special drive cable. The device 0 drive is the drive connected to the short segment of the drive cable (or that connector closest to the system board); the device 1 drive is the drive connected to the long segment of the drive cable. Drive installation requires no jumper setting changes on the existing or optional drives. All Compaq drives have the jumpers preset for cable-select installation. If installing a second device on the primary controller, you must use an 80-conductor Ultra ATA cable for optimal performance. This cable is available as a Compaq option. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 4-11 4.10.1 Removing an Internal 3.5-Inch Hard Drive 1. Prepare the computer for disassembly (Section 4.2). 2. Remove the access panel (Section 4.5). 3. Remove the front bezel (Section 4.6). 4. Disconnect the power and data cables from the back of the hard drive. 5. Slide the drivelock mechanism to unlock the hard drives 1. 6. While holding the drivelock in the unlocked position, remove the drive from the drive bay 2. 7. Remove the guide screws from the drive. 8. Install two guide screws on each side of the replacement drive (use silver screws). Metric screws (M3) have a black finish while U.S. screws (#6) have a silver finish. Replace the 3.5-inch drive by reversing the above procedure. CAUTION: When servicing the computer, ensure that cables are placed in their proper locations during the reassembly process. Improper cable placement can damage the computer. CAUTION: Use only 3/16-inch or 5-mm long screws as guide screws. Longer screws can damage the internal components of the drive. When installing a second ATA hard drive on the primary controller, you must use an 80-conductor ATA cable for optimal performance. The system automatically recognizes hard drives sold by Compaq (or any other plug and play hard drive) and will automatically reconfigure the computer. If you installed a thirdparty hard drive, or one that is not a plug and play device, you must run Computer Setup to reconfigure the computer. 4-12 Removal & Replacement Procedures 4.10.2 Removing an External 5.25-Inch Drive 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. Remove the access panel (Section 4.5). 3. Remove the front bezel (Section 4.6). 4. Slide the drivelock mechanism to unlock the drive 1. 5. While the drivelock is held in the unlatched position, remove the drive from the drive bay 2. 6. Remove the guide screws from the drive. To install a new drive: 1. Install two guide screws on each side of the replacement drive. Metric screws (M3) have a black finish while U.S. screws (#6) have a silver finish. CD and DVD drives use black metric screws. 2. Ensure that the guide screw lines up with the guide slots, then gently slide the drive into the drive bay until it snaps into place. 3. Connect the power and signal cables to the back of the drive. 4. Remove the bezel blank from the subpanel, if necessary (Section 4.8). 5. Reinstall the subpanel and the front bezel. The system automatically recognizes hard drives sold by Compaq (or any other plug and play hard drive) and will automatically reconfigure the computer. If you installed a thirdparty hard drive, or one that is not a plug and play device, you must run Computer Setup to reconfigure the computer. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 4-13 4.10.3 Removing an External 3.5-Inch Drive If you are installing a second 3.5-inch diskette drive into 5.25-inch bays #1 or 2 for the first time, you must use a special adapter bracket. If you are installing a 3.5-inch diskette drive into 5.25-inch bay #3, you must use a special adapter bracket. If installing a second ATA hard drive on the primary controller, you must use an 80conductor ATA cable for optimal performance. 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. Remove the access panel (Section 4.5). 3. Remove the front bezel (Section 4.6). The primary diskette drive is always installed in drive bay 3. 4. Slide the drivelock mechanism to unlock the drive 1. 5. While the drivelock is held in the unlatched position, remove the drive from the drive bay 2. 4-14 Removal & Replacement Procedures 6. Remove the bracket brace 1 from the top of the drive adapter by squeezing inward on both sides, then rotating the brace up and out. 7. Remove the drive bezel 2. 8. Remove the three screws 3 that secure the drive 4 to the drive adapter. 9. Lift the drive out of the drive adapter. 10. Remove the guide screws from the drive 5. To replace the drive, reverse the previous procedures. The primary 3.5-inch diskette drive should only be installed into bay 3. Bay 3 is the bottom bay in the minitower. When replacing the drive, use the existing screws. Metric screws (M3) have a black finish while U.S. screws (#6) have a silver finish. Diskette drives use black metric screws. The drive adapters use silver U.S. screws. CAUTION: When servicing the computer, ensure that cables are placed in their proper locations during the reassembly process. Improper cable placement can damage the computer. CAUTION: Use only 3/16-inch or 5-mm long screws as guide screws. Longer screws can damage the internal components of the drive. Compaq Deskpro EX and Deskpro EXS Series of Personal Computers 4-15 4.11 4.11.1