dell latitude c540 User Manual

							Palm Rest: Dell Latitude C540/C640 Service Manual
 
1 M2.5 x 12-mm screws 
(3)
2 M2 x 3-mm screws (2)
3 hard-drive bay door
5.  Remove the two M2 x 3-mm screws that are located in the hard-drive bay d\
oor  labeled circle P. 
6.  Turn the computer over, and remove the three M2 x 3-mm screws that secur\
e  the palm rest to the bottom case: 
a.  Remove the two M2 x 3-mm screws that are located on the back edge of  the bottom case, underneath the display assembly. 
b.  Remove the M2 x 3-mm screw located near the right side of the bottom  case, next to the microprocessor thermal cooling assembly and opposite 
the S-video TV-out connector. 
7.  Pull up on the pull-tab that is attached to the palm-rest flex cable con\
nector to  remove it from the interface connector on the system board. 
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							Palm Rest: Dell Latitude C540/C640 Service Manual
 
1 M2 x 3-mm screws (3)
2 palm rest
3 palm-rest flex cable
4 bottom case
5 interface connector for 
palm-rest flex cable
6 back center of the palm 
rest
NOTICE: Carefully separate the palm rest from the bottom case to avoid 
damage to the palm rest. 
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							Palm Rest: Dell Latitude C540/C640 Service Manual
8.  Starting at the back center of the palm rest, use your fingers to separa\
te the palm rest from the bottom case by lifting the inside of the palm rest wh\
ile 
pushing in on the outside. 
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							Microprocessor Thermal Cooling Assembly: Dell Latitude C540/C640 Service\
 Manual
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Microprocessor Thermal Cooling 
Assembly 
Dell™ Latitude™ C540/C640 Service Manual
Removing the Microprocessor Thermal Cooling 
Assembly 
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.  Loosen the four captive screws that secure the microprocessor thermal co\
oling  assembly. 
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							Microprocessor Thermal Cooling Assembly: Dell Latitude C540/C640 Service\
 Manual
 
1 microprocessor thermal 
cooling assembly
2 captive screws (4)
3 right side of thermal 
cooling assembly
4 recess in EMI shield 
(prying location)
4.  Insert a screwdriver into the recess in the EMI shield under the front l\
eft corner  of the thermal cooling assembly, and pry the assembly up and out of the \
system 
board. 
Replacing the Microprocessor Thermal Cooling 
Assembly 
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							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. 
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							Microprocessor Module: Dell Latitude C540/C640 Service Manual
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Microprocessor Module 
Dell™ Latitude™ C540/C640 Service Manual
Removing the Microprocessor Module 
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. 
NOTICE: To ensure proper thermal operation, always install a new, compatible 
thermal cooling assembly along with a new microprocessor. 
NOTICE: Do not touch the processor die. To ensure proper seating of the 
microprocessor in the socket, press down near the edges of the microproc\
essor 
module (on the substrate surrounding the die) while turning the cam sc\
rew. 
NOTICE: To avoid damage to the microprocessor, hold the screwdriver so that 
it is perpendicular to the microprocessor when turning the cam screw. 
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							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. 
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							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 arrow on the ZIF-socket cam screw.
5.  Use a microprocessor extraction tool to remove the microprocessor module\
. 
Replacing the Microprocessor Module 
NOTICE: Ensure that the cam lock is in the fully open position before seating 
the microprocessor module. Seating the microprocessor module properly in\
 the 
ZIF socket does not require force. 
NOTICE: A microprocessor module that is not properly seated can result in an 
intermittent connection, or permanent damage to the microprocessor and Z\
IF 
socket. 
1.  Align the pin-1 corner of the microprocessor module with the pin-1 corne\
r of the  ZIF socket, and insert the microprocessor module. 
NOTE: The pin-1 corner of the microprocessor module has a triangle that aligns\
 
with a triangle (or missing hole) on the pin-1 corner of the ZIF socke\
t. 
NOTICE: You must position the microprocessor module correctly in the ZIF 
socket to avoid permanent damage to the module and the socket. 
When the microprocessor module is correctly seated, all four corners are\
 aligned 
at the same height. If one or more corners of the module are higher than\
 the 
others, the module is not seated correctly.
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							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 with a new microprocessor. 
4.  Update the BIOS using the flash BIOS update floppy disk or CD. For instr\
uctions  on how to flash the BIOS, see 
Flashing the BIOS. 
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