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© 2009 Dell Inc. All rights reserved. Reproduction of these materials in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden. Trademarks used in this text: Dell, the DELL logo, and Inspiron are trademarks of Dell Inc.; Microsoft, Windows, Windows Vista, and Windows Vista start button logo are either trademarks or registered trademarks of Microsoft Corporation in the United States and/or other countries. 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 Inc. disclaims any proprietary interest in trademarks and trade names other than its own. Regulatory Model D02U series Regulatory Type D02U001 and D02U002 September 2009 Rev. A00 Technical Overview Before You Begin Top Cover Bottom Cover Top Bracket I/O Bezel Optical Drive Drive Bay Power-Button Bracket Coin-Cell Battery Hard Drive Wireless Mini-Card (Inspiron 400 Only) Memory Module(s) Processor Heat Sink (Inspiron 400 Only) Processor (Inspiron 400 Only) Chassis Fan I/O Bracket Graphics-Card Heat Sink (Inspiron 400 Only) Graphics Card (Inspiron 400 Only) Graphics-Card Fan (Inspiron 400 Only) System Board System Setup Utility NOTE: A NOTE indicates important information that helps you make better use of your computer. CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem. WARNING: A WARNING indicates a potential for property damage, personal injury, or death. Back to Contents Page Before You Begin Dell™ Inspiron™ 300/400 Service Manual Recommended Tools Turning Off Your Computer Safety Instructions This manual provides procedures for removing and installing the components in your computer. Unless otherwise noted, each procedure assumes that the following conditions exist: l You have performed the steps in Turning Off Your Computer and Safety Instructions. l You have read the safety information that shipped with your computer. l A component can be replaced or—if purchased separately—installed by performing the removal procedure in reverse order. Recommended Tools The procedures in this document may require the following tools: l Small Phillips screwdriver l Hex nut driver l Flash BIOS executable update program at support.dell.com Turning Off Your Computer 1. Save and close all open files and exit all open programs. 2. Shut down the operating system: Windows® XP: Click Start® Shut Down® Shut down. Windows Vista®: Click the Start button , click the arrow , and then click Shut Down. Windows 7: Click the Start button and then click Shut Down. 3. Ensure that the computer is turned off. If your computer did not automatically turn off when you shut down your operating system, press and hold the power button until the computer turns off. Safety Instructions Use the following safety guidelines to help protect your computer from potential damage and to help to ensure your own personal safety. CAUTION: To avoid losing data, save and close all open files and exit all open programs before you turn off your computer. WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage at WARNING: Disconnect all power sources before opening the enclosure to replace, remove, or install accessories. After the installation is completed, the enclosure must be replaced and all fasteners installed before connecting to the power source. CAUTION: Only a certified service technician is authorized to remove the computer cover and access any of the components inside the computer. See the safety instructions for complete information about safety precautions, working inside your computer, and protecting against electrostatic discharge. CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such as a connector on your computer). 1. Ensure that the work surface is flat and clean to prevent the computer cover from being scratched. 2. Turn off your computer (see Turning Off Your Computer) and all attached devices. 3. Disconnect all telephone or network cables from the computer. 4. Disconnect your computer and all attached devices from their electrical outlets. 5. Disconnect all attached devices from your computer. 6. Press and hold the power button while the system is unplugged to ground the system board. Back to Contents Page CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab, not on the cable itself. As you pull connectors apart, keep them evenly aligned to avoid bending any connector pins. Also, before you connect a cable, ensure that both connectors are correctly oriented and aligned. CAUTION: To avoid damaging the computer, perform the following steps before you begin working inside the computer. CAUTION: To disc...