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© 2002 Dell Computer Corporation. All rights reserved. Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden. Trademarks used in this text: Dell, the DELL logo, and Dell Precision are trademarks of Dell Computer Corporation; Microsoft and Windows are registered trademarks of Microsoft Corporation. Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Computer Corporation disclaims any proprietary interest in trademarks and trade names other than its own. Models: WML and WMF October 2002 Rev. A00 Before You Begin Recommended Tools Precautionary Measures Protecting Against Electrostatic Discharge Opening the Computer Cover Inside Your Computer — Dell Precision™ 650 Computer Inside View of Your Computer System Board Components Inside Your Computer — Dell Precision™ 450 Computer Inside View of Your Computer System Board Components Drives — Dell Precision™ 650 Computer Overview Hard Drive Floppy Drive CD/DVD Drive Drive Door — Dell Precision™ 650 Computer Removing the Drive Door Replacing the Drive Door Drives — Dell Precision™ 450 Computer Overview Hard Drive Floppy Drive CD/DVD Drive Cards Installing a Card Removing a Card Card Fan and Guide — Dell Precision 650 Computer Removing the Card Fan and Guide Replacing the Card Fan and Guide The Card Fan Guide Memory Memory Installation Guidelines Removing a Memory Module Adding a Memory Module Microprocessor Airflow Shroud — Dell Precision™ 650 Computer Removing the Microprocessor Airflow Shroud Installing the Microprocessor Airflow Shroud Microprocessor Airflow Shroud — Dell Precision™ 450 Computer Removing the Microprocessor Airflow Shroud Installing the Microprocessor Airflow Shroud Microprocessor Installation Guidelines Installing the Microprocessor Removing the Microprocessor VRM Installing a VRM Removing a VRM Front Panel Removing the Front Panel Replacing the Front Panel Chassis Intrusion Switch Removing the Chassis Intrusion Switch Replacing the Chassis Intrusion Switch Control Panel Control Panel Components Removing the Control Panel Replacing the Control Panel I/O Panel I/O Panel Components for the Dell Precision 650 Computer I/O Panel Components for the Dell Precision 450 Computer Removing the I/O Panel Replacing the I/O Panel Battery Power Supply — Dell Precision™ 650 Computer Removing the Power Supply Replacing the Power Supply Power Supply — Dell Precision™ 450 Computer Removing the Power Supply Replacing the Power Supply System Board Removing the System Board Replacing the System Board Closing the Computer Cover Back to Contents Page Battery Dell Precision™ Workstation 650 and Dell Precision Workstation 450 Service Manual A coin-cell battery maintains computer configuration, date, and time information. The battery can last several years. The battery may need replacing if you have repeatedly reset the time and date information after turning on the computer or if one of the following messages appears: Time-of-day not set - please run SETUP program or Invalid configuration information - please run SETUP program or Strike the F1 key to continue, F2 to run the setup utility To determine whether you need to replace the battery, reenter the time and date in system setup and exit the program to save the information. Turn off your computer and disconnect it from the electrical outlet for a few hours; then reconnect the computer, turn it on, and enter system setup. If the date and time are not correct in system setup, replace the battery. You can operate your computer without a battery; however, without a battery, the configuration information is erased if the computer is turned off or unplugged from the electrical outlet. In this case, you must enter system setup and reset the configuration options. To replace the battery: 1. Locate the battery socket. For the Dell Precision 450 computer, see "System Board Components" or for the Dell Precision 650 computer, see "System Board Components" or see the system board label inside your computer. 2. Remove the battery by carefully prying it out of its socket with your fingers or with a blunt, nonconducting object such as a plastic screwdriver. 3. Insert the new battery into the socket with the side labeled "+" facing up, and snap the battery into place. 4. Close the computer cover, and plug your computer and devices into electrical outlets. 5. Enter system setup and restore the settings. 6. Properly dispose of the old battery. For more information see your System Information Guide. Back to Contents Page CAUTION: Before you begin this procedure, follow the safety instructions in the System Information Guide. CAUTION: A new battery can explode if it is incorrectly installed. Replace the battery only with the same or equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturer's instructions. NOTE: If you have not already don...