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2 Dell Latitude L400 Service Manual
Recommended Tools
Most of the procedures in this manual require the use of one or more of the
following tools:
• #0 and #1 magnetized Phillips-head screwdrivers
• Small flat-blade screwdriver
• 5-mm socket wrench
• Small plastic scribe
• Needle-nose pliers
Preparing to Work Inside Your Computer
Before you start to work on the computer, perform the following steps:
1. Save any work in progress and close all open application programs.
2. Turn off the computer and any attached peripherals.
NOTE: Make sure that the computer is turned off and not in suspend-to-
disk mode (S2D). If you cannot shut down the computer using its operating
system, press the power button for 4 seconds.
3. If the computer is docked in the L400 Advanced Port Replicator (APR),
undock the computer.
4. Disconnect the computer and any attached peripherals from their electrical
outlets to reduce the potential for personal injury or shock. Also disconnect
any telephone or telecommunications lines from the computer.
5. Remove the power cable.
6. Disconnect all other external cables from the computer.
7. Remove any installed PC Cards.
NOTICE: Make sure that the work surface is clean to prevent scratch-
ing the computer cover.
NOTICE: To avoid damaging the system board, you must remove the
main battery before you service the computer.
8. Turn the computer over and remove the main battery assembly from the
battery bay.
Slide the battery bay latch toward the right side of the computer to push
the back side of the battery up and out of the battery bay (see Figure 2).