dell latitude l400 User Manual

support.dell.com Dell Latitude L400 Service Manual 17
NOTICE: The keycaps on the keyboard are fragile, easily dislodged, 
and time-consuming to replace. Be careful when removing and 
handling the keyboard.
6. Remove the keyboard assembly.
To replace the keyboard assembly, perform the following steps.
NOTICE: Position the keyboard cable so it is not twisted when it is 
connected to the system board.
1. Connect the keyboard cable to the connector on the system board.
NOTE: Five metal tabs retain the bottom...

18 Dell Latitude L400 Service Manual
Memory Module
Figure 13.  Memory Module Removal 
NOTICE: To avoid damaging the system board, you must remove the 
main battery before you service the computer.
1. Remove the keyboard bezel. 
2. Remove the keyboard assembly.
3. Ground yourself by touching the unpainted metal surface of an I/O 
connector on the computer’s back panel.
4. To release the memory module from its socket, carefully spread apart          
the inner tabs of the memory module socket just far...

support.dell.com Dell Latitude L400 Service Manual 19
3. Pivot the memory module down until it clicks into place. 
If you do not hear a click as each end of the memory module snaps into the 
tabs, remove the memory module and reinstall it (see Figure 13).
Palmrest Assembly 
Figure 14.  Removing the Palmrest Assembly Bottom Screws
The palmrest assembly consists of the palmrest, status lights, and touch pad 
assembly.
NOTICE: To avoid damaging the system board, you must remove the 
main battery before you...

20 Dell Latitude L400 Service Manual
7. Remove the four black M2 x 4-mm screws across the top of the computer 
(see Figure 15). 
 
Figure 15.  Removing the Palmrest Assembly Top Screws
8. Remove the three silver M2 x 6-mm screws in the keyboard-assembly  
area that secure the middle of the palmrest assembly to the bottom case 
(see Figure 15).
9. Disconnect the status lights flex cable from the ZIF connector on the 
system board.
10. Disconnect the touch pad flex cable from the ZIF connector on the...

support.dell.com Dell Latitude L400 Service Manual 21
To replace the palmrest assembly, perform the following steps:
1. Place the palmrest assembly on the bottom assembly.
2. Reinstall the three silver M2 x 6-mm screws in the keyboard-assembly area 
that secure the middle of the palmrest assembly to the bottom-case 
assembly (see Figure 15).
3. Reinstall the four black M2 x 4-mm screws that secure the top of the 
palmrest assembly to the bottom-case assembly (see Figure 15).
4. Connect the touch pad flex...

22 Dell Latitude L400 Service Manual
2. Remove the display assembly.
3. Remove the keyboard assembly.
4. Remove the palmrest assembly.
5. Remove the three M2 x 3.5-mm screws that secure the touch pad 
assembly to the palmrest assembly (see Figure 16).
6. Slide the touch pad assembly out from under the two hold-down tabs.
7. Remove the touch pad assembly from the palmrest assembly.
8. Disconnect the flex cable from the ZIF connector on the back of the touch 
pad (see Figure 16).
The flex cable remains...

support.dell.com Dell Latitude L400 Service Manual 23
Reserve Battery    
Figure 18.  Reserve Battery Removal
NOTICE: The reserve battery provides power to the computers RTC 
and nonvolatile random-access memory (NVRAM) when the com-
puter is turned off. Removing the battery causes the computer to lose 
the date and time information as well as all user-specified parame-
ters in the BIOS. If possible, make a copy of this information before 
you remove the reserve battery.
1. Remove the keyboard bezel.
2....

24 Dell Latitude L400 Service Manual
Modem
Figure 19.  Modem Removal
1. Remove the keyboard bezel.
2. Remove the display assembly.
3. Remove the keyboard assembly.
4. Remove the palmrest assembly.
5. Use a 5-mm socket wrench to remove the four 5-mm socket screws for the 
VGA and parallel ports located on the back of the bottom assembly.
6. Use a small flat-blade screwdriver to remove the two integrated drive 
electronics (IDE) connector screws at both ends of the IDE (modular bay) 
connector located on...

support.dell.com Dell Latitude L400 Service Manual 25
To replace the modem, perform the following steps:
1. Connect the modem cable to the connector on the system board.
2. Align the connector on the bottom of the modem with the connector on 
the system board, and carefully press the modem onto the system board.
3. Put the modem retainer bracket in place.
4. Reinstall the M2 x 9.5-mm screw to secure the modem retainer bracket 
and modem to the system board.
5. Reinstall the two IDE connector screws at...

26 Dell Latitude L400 Service Manual
4. Remove the palmrest assembly.
5. Carefully disconnect the fan wire connector from the system board       
(see Figure 20).
The male connector on the fan wire is keyed to fit into the female 
connector one way only.
6. Remove the two M2 x 8-mm screws with double rubber washers that 
secure the fan to the bottom assembly (see Figure 20). 
7. Remove the fan from the bottom assembly.
To replace the fan, perform the following steps:
1. Place the fan in the bottom...