Dell Precision M90 User manual

DellPrecision™M90MobileWorkstationServiceManual
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Notes, Notices, and Cautions
Abbreviations and Acronyms
For a complete list of abbreviations and acronyms, see "Glossary" in the User's Guide.
IfyoupurchasedaDell™nSeriescomputer,anyreferencesinthisdocumenttoMicrosoft®Windows®operating systems are not applicable.
Information in this document is subject to change without notice.
©2006DellInc.Allrightsreserved.
Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.
Trademarks used in this text: Dell, the DELL logo, and Dell Precision are trademarks of Dell Inc.; 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 Inc. disclaims any
proprietary interest in trademarks and trade names other than its own.
Model PP05XA
March 2006 Rev. A00
Before You Begin
Speakers
System Components
Subwoofer
Optical Drive
USB Port Board
Hard Drive
Processor Thermal-Cooling Assembly
Memory Module(s)
Processor Module
Modem
Video Card/Thermal-Cooling Assembly
Mini-Card
System Fan(s)
Internal Card With Bluetooth®Wireless Technology
ExpressCard Cage
Hinge Cover
Smart Card Reader
Keyboard
System Board
Display
Battery Latch Assembly
Palm Rest
Flashing the BIOS
Coin-Cell Battery
Pin Assignments for I/O Connectors
NOTE: A NOTE indicates important information that helps you make better use of your computer.
NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.
CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.

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Battery Latch Assembly
DellPrecision™M90MobileWorkstationServiceManual
Removing the Battery Latch Assembly
Replacing the Battery Latch Assembly
Removing the Battery Latch Assembly
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1. Follow the instructions in Before Working Inside Your Computer.
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2. Remove the hinge cover (see Removing the Hinge Cover).
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3. Remove the keyboard (see Keyboard).
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4. Remove the display assembly (see Removing the Display Assembly).
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5. Remove the palm rest (see Removing the Palm Rest).
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6. Remove the system board (see Removing the System Board).
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7. Remove the hard drive bay by removing the four M2 x 3-mm screws, and lifting out the bay.
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8. Remove the screw in the battery latch assembly.
When you remove the screw, the battery latch release on the bottom of the computer will also be removed.
CAUTION: Before you begin the following procedure, follow the safety instructions in the Product Information Guide.
NOTICE: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface (such
as the back panel) on the computer.
NOTICE: To help prevent damage to the system board, remove the main battery (see Before Working Inside Your Computer) before working inside the
computer.
NOTE: You can remove the hard drive bay without removing the ExpressCard cage from the hard drive bay.
1
hard drive bay
2
ExpressCard cage
3
M2 x 3-mm screws (4)

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9. Remove the spring from the hook on the computer base by lifting it up and away with a screwdriver or a plastic scribe.
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10. Remove the plastic battery-latch assembly by twisting the assembly slightly and lifting it out of the channel and away from the computer base.
Replacing the Battery Latch Assembly
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1. Insert the latch assembly into the channel on the computer base, and press it into place.
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2. Using a small screwdriver, hook the spring over the hook on the computer base.
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3. Place the battery latch release under the computer base, line it up with the hole in the base, and then replace the screw in the assembly.
Ensure that the newly installed latch moves smoothly and freely when pushed and released.
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4. Replace the hard drive bay and reinsert the four M2 x 3-mm screws.
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1
screw
2
battery latch assembly
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1
hook
2
spring
1
battery latch assembly

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5. Replace the system board and the four M2.5 x 5 screws.
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6. Replace in reverse order the other components that you removed in Removing the Battery Latch Assembly.
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Before You Begin
DellPrecision™M90MobileWorkstationServiceManual
Recommended Tools
Turning Off Your Computer
Before Working Inside Your Computer
Computer Orientation
Screw Identification
This section 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 Before Working Inside Your Computer.
lYouhavereadthesafetyinformationintheDell™Product Information Guide.
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 flat-blade screwdriver
lPhillips screwdriver
lSmall plastic scribe
lFlash BIOS update program CD
Turning Off Your Computer
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1. Shut down the operating system:
Save and close any open files, exit any open programs, click Start®Shut Down®Shut down.
The computer turns off after the operating system shutdown process finishes.
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2. Ensure that the computer and any attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut
down your operating system, press and hold the power button for 4 seconds.
Before Working Inside Your Computer
Use the following safety guidelines to help protect your computer from potential damage and to help ensure your own personal safety.
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1. Ensure that the work surface is flat and clean to prevent the computer cover from being scratched.
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2. Turn off your computer (see Turning Off Your Computer).
NOTICE: To avoid losing data, save and close any open files and exit any open programs before you turn off your computer.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
NOTICE: Handle components and cards with care. Do not touch the components or contacts on a card. Hold a card by its edges or by its metal
mounting bracket. Hold a component such as a processor by its edges, not by its pins.
NOTICE: Only a certified service technician should perform repairs on your computer. Damage due to servicing that is not authorized by Dell is not
covered by your warranty.
NOTICE: When you disconnect a cable, pull on its connector or on its strain-relief loop, not on the cable itself. Some cables have a connector with
locking tabs; if you are disconnecting this type of cable, press in on the locking tabs before you disconnect the cable. 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.
NOTICE: To help prevent damage to the computer, perform the following steps before you begin working inside the computer.
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network device.