dell latitude c840 User Manual

							Palm Rest: Dell Latitude C840 Service Manual
Replacing the Palm Rest 
When replacing the palm rest screws, install the two screws at the back \
corners of the 
computer first to help align the palm rest correctly.
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							Reserve Battery: Dell Latitude C840 Service Manual
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Reserve Battery 
Dell™ Latitude™ C840 Service Manual
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. 
 
1 palm rest bracket
2 reserve battery
3 reserve battery cable
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							Reserve Battery: Dell Latitude C840 Service Manual
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 NVRAM. If possible, copy the information before you remove\
 the 
reserve battery. 
Removing the Reserve Battery 
1.  Follow the instructions in Preparing to Work Inside the Computer. 
2.  Remove the 
keyboard. 
3.  Remove the 
hinge cover. 
4.  Remove the 
display assembly. 
5.  Remove the 
palm rest. 
6.  On the underside of the palm rest, disconnect the palm-rest flex cable f\
rom the  ZIF connector. 
 
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							Reserve Battery: Dell Latitude C840 Service Manual
1M2.5 x 4-mm screws (4)
2 palm rest bracket
3 palm-rest flex cable
7.  Remove the four M2.5 x 4-mm screws that secure the palm rest bracket. 
8.  While supporting the palm-rest flex cable, lift out the palm rest bracke\
t and turn  it over. 
9.  Disconnect the reserve battery cable. 
10.  Remove the reserve battery:  a.  Pry the reserve battery free from the metal palm rest bracket. 
b.  Remove the foam-pad remnants from the palm rest bracket. 
Replacing the Reserve Battery 
1.  Seat the reserve battery and press it into place. 
2.  Connect the reserve battery cable. 
3.  Place the palm rest bracket loosely in the palm rest, and connect the pa\
lm-rest  flex cable to the ZIF connector. 
4.  Replace the four M2.5 x 4-mm screws that secure the palm rest bracket to\
 the  palm rest. 
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							System Board: Dell Latitude C840 Service Manual
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System Board 
Dell™ Latitude™ C840 Service Manual
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. 
 
1 M2.5 x 4-mm captive-
washer screws (3)
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							System Board: Dell Latitude C840 Service Manual
2system board
3 network connector
4 modem connector
5 network cable cover
6 M2.5 x 20-mm screw
The BIOS chip on the system board contains the service tag sequence, whi\
ch is also 
visible on a bar code label on the bottom of the computer.
The replacement kit for the system board includes a floppy disk or CD th\
at provides a 
utility for transferring the service tag sequence to the replacement sys\
tem board.
NOTICE: If you received a flash BIOS update floppy disk or CD with the 
replacement microprocessor, you must update the BIOS after replacing the\
 
microprocessor module. 
Removing the System Board 
1.  Follow the instructions in Preparing to Work Inside the Computer. 
2.  Remove the 
hard drive and the fixed optical drive. 
3.  Remove any installed 
Mini PCI Cards. 
4.  If migrating the memory, remove all installed 
memory modules. 
5.  Remove (if migrating) or disconnect the 
modem daughter card. 
6.  Remove the 
keyboard. 
7.  Remove the 
hinge cover. 
8.  Remove the 
display assembly. 
9.  Remove the 
palm rest. 
10.  Remove the 
video graphics board. 
11.  Remove the 
microprocessor thermal-cooling assembly. 
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							System Board: Dell Latitude C840 Service Manual
12.  If migrating the microprocessor, remove the microprocessor module. 
13.  Separate the network cable from the system board:  a.  First remove the network cable cover: Insert a narrow plastic scribe or \
small screwdriver just barely into the slot that faces the back of the 
computer (do not insert the scribe far enough to catch on the wires 
inside), press down on the cover lightly to secure it, and pry upward t\
o 
release the cover. 
 
1 network cable cover
b.  Disconnect the network cable. Do not pull on the cable wires. Instead, p\
ry up the outer corner of the upper connector until the connectors start to\
 
separate. 
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							System Board: Dell Latitude C840 Service Manual
 
1 outer corner of upper 
connector
2 network cable
14.  Remove the three M2.5 x 4-mm captive-washer screws from the system board\
. 
15.  Remove the M2.5 x 20-mm screw from the center of the LED board. 
16.  Lift the front of the system board and work it out of the back panel. 
If necessary to help release the system board, pull outward on the top o\
f the 
plastic near the back left corner of the bottom case (see the small arr\
ow at the far 
left in the following figure).
System Board 
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							System Board: Dell Latitude C840 Service Manual
 
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							Battery and Module Bay Latches: Dell Latitude C840 Service Manual
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Battery and Module Bay Latches 
Dell™ Latitude™ C840 Service Manual
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. 
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