dell latitude c640 User Manual

							Dell Latitude C540/C640 Service Manual
Dell™ Latitude™ C540/C640 Service 
Manual
Before You Begin
System Components
Hard Drive
Memory Modules, Mini PCI Card, and Modem
Keyboard
Display Assembly, Display Latch, and Hinge Covers
Palm Rest
Microprocessor Thermal Cooling Assembly
Microprocessor Module
Hybrid Cooling Fan
Reserve Battery
Flashing the BIOS
Speaker Assemblies
System Board
Battery and Module Bay Latches
Pin Assignments for I/O Connectors
Notes, Notices, and Cautions 
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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							Dell Latitude C540/C640 Service Manual

Trademarks used in this text: Dell, the DELL logo, and Latitude are trademarks of Dell Computer 
Corporation.
Other trademarks and trade names may be used in this document to refer t\
o either the entities 
claiming the marks and names or their products. Dell Computer Corporatio\
n disclaims any proprietary 
interest in trademarks and trade names other than its own.
April 2003  Rev. A01
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							Before You Begin: Dell Latitude C540/C640 Service Manual
Back to Contents Page 
Before You Begin 
Dell™ Latitude™ C540/C640 Service Manual
  Preparing to Work Inside the Computer
  Recommended Tools
  Screw Identification
Preparing to Work Inside the Computer
 CAUTION: Before working inside your computer, read the safety 
instructions in your System Information Guide.
 CAUTION: 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. 
1.  Ensure that the work surface is clean to prevent scratching the computer\
 cover. 
2.  Save any work in progress and exit all open programs. 
3.  Turn off the computer and all attached devices. 
NOTE: Before turning off the computer, ensure that the computer is not in a 
power management mode. If you cannot shut down the computer using the 
computer operating system, press and hold the power button for 4 seconds\
. 
4.  If the computer is connected (docked) to a docking device, undock it. \
See the  documentation that came with the docking device for instructions. 
5.  Disconnect the computer and any attached devices from electrical outlets\
. 
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							Before You Begin: Dell Latitude C540/C640 Service Manual
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 surfa\
ce. 
NOTICE: To avoid damaging the system board, you must remove the main 
battery and secondary battery (if present) before you service the comp\
uter. 
10.  Remove the primary battery from the battery bay and the secondary batter\
y  from the module bay, if a secondary battery is in use. 
11.  Remove any installed device in the module bay. 
12.  To dissipate any static electricity while you work, use a wrist groundin\
g strap or  periodically touch an unpainted metal surface. 
13.  Handle components and cards with care. Do not touch the components or  contacts on a card. Hold a card by it edges or by its metal mounting bra\
cket. 
Hold a component such as a microprocessor by its edges, not by its pins.\
 
Recommended Tools
The procedures in this manual require the following tools:
l     #1 magnetized Phillips screwdriver
l     ¼-inch flat-blade screwdriver
l     Small plastic scribe
l     Microprocessor extractor
l     Flash BIOS update program floppy disk or CD.
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							Before You Begin: Dell Latitude C540/C640 Service Manual
Computer Orientation 
 
1 back
2 right
3 front
4 left                                  
Screw Identification
When you are removing and replacing components, photocopy the placemat a\
s a tool 
to lay out and keep track of the screws. The placemat provides the numbe\
r of screws 
and their sizes.
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							Before You Begin: Dell Latitude C540/C640 Service Manual
 
NOTICE: When reinstalling a screw, you must use a screw of the correct 
diameter and length. Ensure that the screw is properly aligned with its \
corresponding hole, and avoid overtightening. 
Hard Drive Door:
(1 each)
  Memory Module Cover:
(2 captive screws)
(1 each)
NOTE: The single screw is 
one of the five keyboard 
screws. 
 
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							Before You Begin: Dell Latitude C540/C640 Service Manual
Modem to 
System Board:
(2 each)
 Keyboard to
Bottom Case:
(5 each) 
Hinges to Bottom Case:
(5 each)
  Display-Feed Flex Cable:
(4 each)
 
Display Bezel:
(6 each)
 
Rubber Screw Covers (6 
each) Display Panel to Top 
Cover:
(5 each) 
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							Before You Begin: Dell Latitude C540/C640 Service Manual
Display Latch:
(2 each) (2 each)
 Palm Rest to
Bottom Case:
(3 each) (5 each) 
Hybrid Cooling Fan:
(2 each) (1 each)
  System Board to Bottom 
Case:
(10 each) 
Back to Contents Page
 
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							System Components: Dell Latitude C540/C640 Service Manual
Back to Contents Page 
System Components 
Dell™ Latitude™ C540/C640 Service Manual
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 document assumes 
that a part can be replaced by performing the removal procedure in rever\
se 
order. 
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							System Components: Dell Latitude C540/C640 Service Manual
 
1 display assembly 10bottom case
2 center control cover 11memory module 
cover
3 microprocessor thermal 
cooling assembly 12
module bay device
4 hybrid cooling fan 13main battery
5 microprocessor 14hard drive
6 system board 15left speaker
7 right speaker 16palm rest
8 modem and network-adapter 
connector cover 17
keyboard
9 fan guard   
Back to Contents Page
 
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