Dell Precision M40 User manual

DellPrecision™MobileWorkstationM40ServiceManual
Before You Begin
Preparing to Work Inside the Computer
Recommended Tools
Screw Identification
Removing and Replacing Parts
System Components
Hard Drive
Fixed Optical Drive
Memory Module
Mini PCI Card Assembly
Keyboard Assembly
Display and Bezel Assemblies
Microprocessor Thermal Cooling Assembly
Microprocessor Module
Video Graphics Board
Palmrest Assembly
Reserve Battery
System Board Assembly
Battery and Modular Bay Latch Assemblies
Battery Charger Board
LED Board
Fan Assembly
RJ-11/RJ-45 Board
Notes, Notices, and Cautions
Information in this document is subject to change without notice. ©2001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.
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.
September2001
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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Before You Begin
DellPrecision™MobileWorkstationM40ServiceManual
Preparing to Work Inside the Computer
Recommended Tools
Screw Identification
Preparing to Work Inside the Computer
1. Make sure that the work surface is flat and clean to prevent scratching the computer cover.
2. Save any work in progress and close all open application programs.
3. Turn off the computer and all attached devices.
4. Make sure the computer is undocked.
5. Disconnect the computer from the electrical outlet.
6. To avoid possible damage to the system board, wait 10 to 20 seconds and then disconnect any attached devices.
7. Disconnect all other external cables from the computer.
8. Remove any installed PC Cards or plastic blanks from the PC Card slot.
9. Close the display and turn the computer upside down on a flat work surface.
10. Remove the battery from the battery bay.
11. Remove any device installed in the modular bay.
12. To dissipate static electricity while you work, periodically touch an unpainted metal surface on the computer chassis.
13. Handle components and cards by their edges, and avoid touching pins and contacts.
Recommended Tools
The procedures in this manual require the following tools:
l#1 magnetized Phillips screwdriver
lSmall flat-blade screwdriver
lSmall plastic scribe
lMicroprocessor extractor
lNonmarring tool
lFlash BIOS upgrade program diskette or CD (provided when needed to upgrade the system BIOS)
System Orientation
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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: To avoid damaging the computer, perform the following steps before you begin working inside the computer:
NOTE: Before turning off the computer, make sure the computer is not in a power-management mode.
NOTICE: To avoid component damage, always remove any installed batteries before you service the computer.

Screw Identification
When you are removing and replacing components, photocopy the placemat as a tool to lay out and keep track of the component screws.The placemat
provides the number of screws and the sizes.
Screw Identification
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NOTICE: When reinstalling a screw, you must use a screw of the correct diameter and length. Make sure that the screw is properly aligned with its
corresponding hole, and avoid overtightening.
Screw Placement Map
Hard Drive Door Security:
M3.0 x 5 mm (1 each)
Keyboard to Bottom Case Assembly:
M2.5 x 20 mm (4 each; one in memory door and
one in mini-PCI door)
Display to Base:
M2.5 x 6 mm (3 each; 2 at back of system; 1 at
flex cable strain relief)
Display Bezel:
Rubber screw covers (4
each)
Plastic screw covers (2
each)
M2.5 x 4 mm (6 each)
Display Panel to Display Mounting Bracket:
M2.0 x 3 mm(6 each)
Flex Cable Mounting Bracket to Top Cover:
M2.5 x 4 mm (1 each)
Video Graphics Board:
M2.5 x 8 (3 each)
Palmrest to
Bottom Case Assembly:
M2.5 x 20 mm (9 each)
System Board:
M2.5 x 4 mm captive washer
(3 each)
LED Board:
M2.0 x 4 mm (2 each)

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Palmrest Bracket:
M2.5 x 4 mm (2 each)
M2.5 x 20 mm (1 each)
Fan Assembly:
M2.0 x 4 mm (3 each)
RJ-11/RJ-45 Board Assembly:
M2.5 x 4 mm (1 each)

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Removing and Replacing Parts
DellPrecision™MobileWorkstationM40ServiceManual
System Components
Exploded View

Hard Drive
System Components
Hard Drive
Fixed Optical Drive
Memory Module
Mini PCI Card Assembly
Keyboard Assembly
Display and Bezel Assemblies
Microprocessor Thermal Cooling Assembly
Microprocessor Module
Video Graphics Board
Palmrest Assembly
Reserve Battery
System Board Assembly
Battery and Modular Bay Latch Assemblies
Battery Charger Board
LED Board
Fan Assembly
RJ-11/RJ-45 Board
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: Unless otherwise noted, each procedure in this manual assumes that a part can be replaced by performing the removal procedure in reverse
order.
NOTICE: Disconnect the computer and attached devices from the electrical outlet and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.
NOTICE: The hard drive is very sensitive to shock. Handle it by its edges (do not squeeze the top of the case), and avoid dropping it.

Hard Drive

Removing the Hard Drive
1. Follow the instructions in "Preparing to Work Inside the Computer."
2. Remove the drive door screw.
3. Pull the hard drive out.
Replacing the Hard Drive
1. Gently push the hard drive into the drive bay until the drive door is flush with the computer case.
2. Push down on the drive until it snaps into place.
3. Replace the screw in the hard drive door.
Fixed Optical Drive
Fixed Optical Drive
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Removing the Fixed Optical Drive
1. Follow the instructions in "Preparing to Work Inside the Computer."
2. Loosen the captive screw on the bottom of the computer.
NOTICE: Disconnect the computer and attached devices from the electrical outlet and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.

3. Turn the computer over, pull out the pull tab, and use the pull tab to remove the fixed optical drive.
Memory Module
Removing the Memory Module Cover
Memory Module Cover

1. Follow the instructions in "Preparing to Work Inside the Computer."
2. Remove the screw.
3. Disengage the metal tabs at the opposite end of the cover.
Memory Modules

Removing the Memory Modules
1. Remove the memory module cover.
2. To release a memory module from its socket, spread apart the tabs at each side of the module until the module pops up slightly.
NOTICE: To keep the pull tab from catching on the captive screw, turn the computer over before removing the fixed optical drive.
NOTICE: Disconnect the computer and any attached devices from electrical outlets and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.

3. Lift the memory module out of its socket.
Replacing the Memory Modules
1. If you only have one memory module, install it in the socket labeled "DIMM A." Install a second memory module in the socket labeled "DIMM B."
2. Insert the memory module's edge connector into the socket slot at a 45-degree angle and press the module firmly into the slot.
3. Pivot the module down until it clicks into place. If you do not hear a click, remove the module and reinstall it.
4. Insert the metal tabs on the memory module cover into the bottom case assembly, rotate the cover down, and replace the screw.
Mini PCI Card Assembly
You must remove the Mini PCI Card assembly before the system board assembly can be removed. A Mini PCI Card assembly consists of a modem and NIC
combination. A NIC combination must be connected to the wiring harness as appropriate.
Mini PCI Card Cover
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Removing the Mini PCI Card Assembly
1. Follow the instructions in "Preparing to Work Inside the Computer."
2. Remove the Mini PCI Card cover.
3. To release the Mini PCI Card assembly, spread the metal securing tabs until the assembly pops up slightly.
4. Disconnect the assembly from the wiring harness.
5. Lift out the assembly and disconnect any attached cables.
Replacing the Mini PCI Card Assembly
1. Align the Mini PCI Card assembly with the socket at a 45-degree angle, and press the Mini PCI Card into the socket.
2. Connect the wiring harness to the Mini PCI Card assembly.
Mini PCI Card Assembly Wiring Harness
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NOTE: Memory modules are keyed to fit into their sockets in only one direction.
NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.
NOTICE: The connectors are keyed for correct insertion; do not force the connections.

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3. Pivot the Mini PCI Card assembly down until it clicks into place.
4. Replace the Mini PCI Card assembly cover.
Keyboard Assembly
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Keyboard Screws

Removing the Keyboard Assembly
1. Follow the instructions in "Preparing to Work Inside the Computer."
2. Turn the computer over and remove the four screws labeled with a "circle K."
3. Turn the computer over and open the display.
4. Use a nonmarring tool under the blank key to pry up the keyboard.
NOTICE: Disconnect the computer and attached devices from electrical outlets and remove any installed batteries.
NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by periodically touching unpainted metal on the computer.
NOTICE: Be careful when handling the keyboard. The keycaps are fragile, easily dislodged, and time-consuming to replace.

Keyboard Removal
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5. Lift the right end of the keyboard and slide it slightly toward the right side of the computer to disengage the tabs at the left end.
6. Pivot the keyboard and balance it upright on the left side of the computer.
Keyboard Cable

7. Disconnect the keyboard cable and lay the keyboard assembly aside.
Replacing the Keyboard Assembly
1. While bracing the keyboard assembly upright on its left end, connect the keyboard cable to the interface connector on the system board.
2. Insert the metal tabs at the left end of the keyboard under the edge of the bottom case assembly, and fit the keyboard into place.
3. Check that the keyboard is correctly installed. The keys should be flush with the left and right surfaces of the palmrest.
4. Reinstall the four screws in the holes labeled "circle K."
Display and Bezel Assemblies
NOTICE: Position the keyboard/track stick flex cable so it is not pinched when you replace the keyboard in the bottom case assembly.