dell latitude c640 User Manual
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![Page 46
Microprocessor Thermal Cooling Assembly: Dell Latitude C540/C640 Service\
Manual
NOTICE: To ensure proper thermal operation, always install a new, compatible
thermal cooling assembly along with a new microprocessor.
1. Place the right side of the microprocessor thermal cooling assembly unde\
r the palm rest and lower the assembly onto the system board.
2. Tighten the four captive screws, labeled 1 through 4, in consecutive ord\
er.
Back to Contents Page...](http://img.usermanuals.tech/thumb/19/48083/w64_dell-latitude-c640-service-manual-45.png "Page 46
Microprocessor Thermal Cooling Assembly: Dell Latitude C540/C640 Service\
Manual
NOTICE: To ensure proper thermal operation, always install a new, compatible
thermal cooling assembly along with a new microprocessor.
1. Place the right side of the microprocessor thermal cooling assembly unde\
r the palm rest and lower the assembly onto the system board.
2. Tighten the four captive screws, labeled 1 through 4, in consecutive ord\
er.
Back to Contents Page...")
![Page 48
Microprocessor Module: Dell Latitude C540/C640 Service Manual
1 screwdriver
(perpendicular to
microprocessor)
2 pin-1 corner
3 processor die (do not
touch)
4 ZIF socket
5 ZIF-socket cam screw
1. Remove the
hard drive.
2. Remove the
keyboard.
NOTICE: To ensure maximum cooling for the microprocessor, do not touch the
heat transfer areas on the microprocessor thermal cooling assembly. The \
oils in
your skin reduce the heat transfer capability of the thermal pads....](http://img.usermanuals.tech/thumb/19/48083/w64_dell-latitude-c640-service-manual-47.png "Page 48
Microprocessor Module: Dell Latitude C540/C640 Service Manual
1 screwdriver
(perpendicular to
microprocessor)
2 pin-1 corner
3 processor die (do not
touch)
4 ZIF socket
5 ZIF-socket cam screw
1. Remove the
hard drive.
2. Remove the
keyboard.
NOTICE: To ensure maximum cooling for the microprocessor, do not touch the
heat transfer areas on the microprocessor thermal cooling assembly. The \
oils in
your skin reduce the heat transfer capability of the thermal pads....")
![Page 49
Microprocessor Module: Dell Latitude C540/C640 Service Manual
3. Remove the microprocessor thermal cooling assembly.
NOTICE: When removing the microprocessor module, pull the module straight
up. Be careful not to bend the pins on the microprocessor module.
4. To loosen the ZIF socket, use a small, flat-blade screwdriver and rotate\
the ZIF- socket cam screw counter-clockwise until it reaches the cam stop.
The ZIF-socket cam screw secures the microprocessor to the system board.\
Take
note of the...](http://img.usermanuals.tech/thumb/19/48083/w64_dell-latitude-c640-service-manual-48.png "Page 49
Microprocessor Module: Dell Latitude C540/C640 Service Manual
3. Remove the microprocessor thermal cooling assembly.
NOTICE: When removing the microprocessor module, pull the module straight
up. Be careful not to bend the pins on the microprocessor module.
4. To loosen the ZIF socket, use a small, flat-blade screwdriver and rotate\
the ZIF- socket cam screw counter-clockwise until it reaches the cam stop.
The ZIF-socket cam screw secures the microprocessor to the system board.\
Take
note of the...")
![Page 50
Microprocessor Module: Dell Latitude C540/C640 Service Manual
NOTICE: Do not touch the processor dienear the edges of the microprocessor
module (on the substrate surrounding the die) while turning the cam sc\
rew.
2. Press down on the edges of the microprocessor module and tighten the ZIF\
socket by turning the cam screw clockwise.
3. Install a new
microprocessor thermal cooling assembly.
NOTICE: To ensure proper thermal operation, always install a new, compatible
thermal cooling assembly along...](http://img.usermanuals.tech/thumb/19/48083/w64_dell-latitude-c640-service-manual-49.png "Page 50
Microprocessor Module: Dell Latitude C540/C640 Service Manual
NOTICE: Do not touch the processor dienear the edges of the microprocessor
module (on the substrate surrounding the die) while turning the cam sc\
rew.
2. Press down on the edges of the microprocessor module and tighten the ZIF\
socket by turning the cam screw clockwise.
3. Install a new
microprocessor thermal cooling assembly.
NOTICE: To ensure proper thermal operation, always install a new, compatible
thermal cooling assembly along...")
![Page 52
Hybrid Cooling Fan: Dell Latitude C540/C640 Service Manual
1 system-board interface
connector 5
M2 x 3-mm screw
(1)
2 fan power cable 6M2.5 x 5-mm screws
(2)
3 spring fingers 7hybrid cooling fan
4 keyboard screw hole
7. Disconnect the fan power cable from the system-board interface connector\
and remove the hybrid cooling fan.
NOTE: The fan power cable is long, and can be pulled out from under the EMI
shield to provide access to the connector.
NOTICE: Do not block the keyboard screw hole...](http://img.usermanuals.tech/thumb/19/48083/w64_dell-latitude-c640-service-manual-51.png "Page 52
Hybrid Cooling Fan: Dell Latitude C540/C640 Service Manual
1 system-board interface
connector 5
M2 x 3-mm screw
(1)
2 fan power cable 6M2.5 x 5-mm screws
(2)
3 spring fingers 7hybrid cooling fan
4 keyboard screw hole
7. Disconnect the fan power cable from the system-board interface connector\
and remove the hybrid cooling fan.
NOTE: The fan power cable is long, and can be pulled out from under the EMI
shield to provide access to the connector.
NOTICE: Do not block the keyboard screw hole...")
![Page 53
Hybrid Cooling Fan: Dell Latitude C540/C640 Service Manual
Back to Contents Page
file:///F|/Service%20Manuals/Dell/Latitude/c540-640/fan.htm (3 of 3) [\
2/28/2004 7:57:54 AM]](http://img.usermanuals.tech/thumb/19/48083/w64_dell-latitude-c640-service-manual-52.png "Page 53
Hybrid Cooling Fan: Dell Latitude C540/C640 Service Manual
Back to Contents Page
file:///F|/Service%20Manuals/Dell/Latitude/c540-640/fan.htm (3 of 3) [\
2/28/2004 7:57:54 AM]")
![Page 54
Reserve Battery: Dell Latitude C540/C640 Service Manual
Back to Contents Page
Reserve Battery
Dellâ„¢ Latitudeâ„¢ C540/C640 Service Manual
Removing the Reserve Battery
NOTICE: The reserve battery provides power to the computers RTC and
NVRAM when the computer is turned off. Removing the battery causes the
computer to lose the date and time information as well as all user-speci\
fied
parameters in the BIOS. If possible, copy the information before you rem\
ove
the reserve battery.
NOTICE: Disconnect...](http://img.usermanuals.tech/thumb/19/48083/w64_dell-latitude-c640-service-manual-53.png "Page 54
Reserve Battery: Dell Latitude C540/C640 Service Manual
Back to Contents Page
Reserve Battery
Dellâ„¢ Latitudeâ„¢ C540/C640 Service Manual
Removing the Reserve Battery
NOTICE: The reserve battery provides power to the computers RTC and
NVRAM when the computer is turned off. Removing the battery causes the
computer to lose the date and time information as well as all user-speci\
fied
parameters in the BIOS. If possible, copy the information before you rem\
ove
the reserve battery.
NOTICE: Disconnect...")
![Page 55
Reserve Battery: Dell Latitude C540/C640 Service Manual
1 reserve battery
2 reserve battery tray
3 reserve battery cable
4 reserve battery
connector on system
board
5 speaker cables
6 opening for reserve
battery cable
Replacing the Reserve Battery
1. Connect the reserve battery cable to the reserve battery connector on th\
e
file:///F|/Service%20Manuals/Dell/Latitude/c540-640/rsrvbatt.htm (2 of \
3) [2/28/2004 7:57:54 AM]](http://img.usermanuals.tech/thumb/19/48083/w64_dell-latitude-c640-service-manual-54.png "Page 55
Reserve Battery: Dell Latitude C540/C640 Service Manual
1 reserve battery
2 reserve battery tray
3 reserve battery cable
4 reserve battery
connector on system
board
5 speaker cables
6 opening for reserve
battery cable
Replacing the Reserve Battery
1. Connect the reserve battery cable to the reserve battery connector on th\
e
file:///F|/Service%20Manuals/Dell/Latitude/c540-640/rsrvbatt.htm (2 of \
3) [2/28/2004 7:57:54 AM]")
![Page 56
Reserve Battery: Dell Latitude C540/C640 Service Manual
system board and then route the battery cable through the opening in the\
EMI
shield to the battery tray.
2. Remove the backing from the adhesive on the bottom of the reserve batter\
y, and press the battery into place in the battery tray.
3. Update the BIOS using a flash BIOS update floppy disk or CD. For instruc\
tions on how to flash the BIOS, see
Flashing the BIOS.
Back to Contents Page...](http://img.usermanuals.tech/thumb/19/48083/w64_dell-latitude-c640-service-manual-55.png "Page 56
Reserve Battery: Dell Latitude C540/C640 Service Manual
system board and then route the battery cable through the opening in the\
EMI
shield to the battery tray.
2. Remove the backing from the adhesive on the bottom of the reserve batter\
y, and press the battery into place in the battery tray.
3. Update the BIOS using a flash BIOS update floppy disk or CD. For instruc\
tions on how to flash the BIOS, see
Flashing the BIOS.
Back to Contents Page...")
Hybrid Cooling Fan: Dell Latitude C540/C640 Service Manual Back to Contents Page Hybrid Cooling Fan Dellâ„¢ Latitudeâ„¢ C540/C640 Service Manual Removing the Hybrid Cooling Fan 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 touching an unpainted metal surface on the computer. NOTICE: Read Preparing to Work Inside the Computer before performing the following procedure. 1. Remove the hard drive. 2. Remove the keyboard. 3. Remove the display assembly. 4. Remove the palm rest. 5. Remove the microprocessor thermal cooling assembly. 6. Remove the two M2.5 x 5-mm screws and one M2 x 3-mm screw that secure the hybrid cooling fan to the system board. file:///F|/Service%20Manuals/Dell/Latitude/c540-640/fan.htm (1 of 3) [\ 2/28/2004 7:57:54 AM]
Hybrid Cooling Fan: Dell Latitude C540/C640 Service Manual 1 system-board interface connector 5 M2 x 3-mm screw (1) 2 fan power cable 6M2.5 x 5-mm screws (2) 3 spring fingers 7hybrid cooling fan 4 keyboard screw hole 7. Disconnect the fan power cable from the system-board interface connector\ and remove the hybrid cooling fan. NOTE: The fan power cable is long, and can be pulled out from under the EMI shield to provide access to the connector. NOTICE: Do not block the keyboard screw hole when reinstalling the fan. Route the fan power cable under the spring fingers and behind the keyboard scr\ ew hole to prevent damage to the fan power cable. file:///F|/Service%20Manuals/Dell/Latitude/c540-640/fan.htm (2 of 3) [\ 2/28/2004 7:57:54 AM]
Hybrid Cooling Fan: Dell Latitude C540/C640 Service Manual Back to Contents Page file:///F|/Service%20Manuals/Dell/Latitude/c540-640/fan.htm (3 of 3) [\ 2/28/2004 7:57:54 AM]
Reserve Battery: Dell Latitude C540/C640 Service Manual Back to Contents Page Reserve Battery Dellâ„¢ Latitudeâ„¢ C540/C640 Service Manual Removing the Reserve Battery NOTICE: The reserve battery provides power to the computers RTC and NVRAM when the computer is turned off. Removing the battery causes the computer to lose the date and time information as well as all user-speci\ fied parameters in the BIOS. If possible, copy the information before you rem\ ove the reserve battery. 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 touching an unpainted metal surface on the computer. NOTICE: Read Preparing to Work Inside the Computer before performing the following procedure. 1. Remove the hard drive. 2. Remove the keyboard. 3. Disconnect the reserve battery cable from the reserve battery connector \ on the system board. 4. Pry the reserve battery free from the EMI shield. The reserve battery is\ attached to the EMI shield with a piece of adhesive tape. 5. Remove any remnants of the adhesive tape from the EMI shield. file:///F|/Service%20Manuals/Dell/Latitude/c540-640/rsrvbatt.htm (1 of \ 3) [2/28/2004 7:57:54 AM]
Reserve Battery: Dell Latitude C540/C640 Service Manual 1 reserve battery 2 reserve battery tray 3 reserve battery cable 4 reserve battery connector on system board 5 speaker cables 6 opening for reserve battery cable Replacing the Reserve Battery 1. Connect the reserve battery cable to the reserve battery connector on th\ e file:///F|/Service%20Manuals/Dell/Latitude/c540-640/rsrvbatt.htm (2 of \ 3) [2/28/2004 7:57:54 AM]
Reserve Battery: Dell Latitude C540/C640 Service Manual system board and then route the battery cable through the opening in the\ EMI shield to the battery tray. 2. Remove the backing from the adhesive on the bottom of the reserve batter\ y, and press the battery into place in the battery tray. 3. Update the BIOS using a flash BIOS update floppy disk or CD. For instruc\ tions on how to flash the BIOS, see Flashing the BIOS. Back to Contents Page file:///F|/Service%20Manuals/Dell/Latitude/c540-640/rsrvbatt.htm (3 of \ 3) [2/28/2004 7:57:54 AM]
Flashing the BIOS: Dell Latitude C540/C640 Service Manual Back to Contents Page Flashing the BIOS Dellâ„¢ Latitudeâ„¢ C540/C640 Service Manual To update the basic input/output system (BIOS):1. Ensure that the AC adapter is plugged in and that the main battery is in\ stalled properly. 2. Turn on the computer and press to enter the system setup program. 3. Reset the boot sequence to boot first from the floppy drive or the CD dr\ ive (depending on whether your flash BIOS update is supplied on floppy disk\ or CD). 4. Insert the flash BIOS update floppy disk or CD, and reboot the computer.\ The computer updates the BIOS and then automatically reboots. 5. Immediately press to enter the system setup program, and reset the boot sequence to the normal setting. Then exit the system setup program. 6. Remove the flash BIOS update floppy disk or CD. Back to Contents Page file:///F|/Service%20Manuals/Dell/Latitude/c540-640/bios.htm [2/28/2004 \ 7:57:55 AM]
Speaker Assemblies: Dell Latitude C540/C640 Service Manual Back to Contents Page Speaker Assemblies Dellâ„¢ Latitudeâ„¢ C540/C640 Service Manual Removing the Speaker Assemblies 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 touching an unpainted metal surface on the computer. NOTICE: Read Preparing to Work Inside the Computer before performing the following procedure. The speakers are located on the front left and right sides of the bottom\ case. As you remove the speakers, take note of the speaker assembly orientations and \ the antenna wire routing under the routing clips. file:///F|/Service%20Manuals/Dell/Latitude/c540-640/speakers.htm (1 of \ 5) [2/28/2004 7:57:56 AM]
Speaker Assemblies: Dell Latitude C540/C640 Service Manual 1 right speaker 2 palm-rest screw posts (2) 3 bottom case holders (2) 4 left speaker file:///F|/Service%20Manuals/Dell/Latitude/c540-640/speakers.htm (2 of \ 5) [2/28/2004 7:57:56 AM]
Speaker Assemblies: Dell Latitude C540/C640 Service Manual file:///F|/Service%20Manuals/Dell/Latitude/c540-640/speakers.htm (3 of \ 5) [2/28/2004 7:57:56 AM]