Dell Latitude D420 Service Manual page 5

4. Disconnect all telephone or network cables from the computer.
5. Close the display and turn the computer upside down on a flat work surface.
NOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer.
6. Disconnect your computer and all attached devices from their electrical outlets.
1 battery 2 battery-bay latch releases (2)
7. Remove the main battery:
a. Slide the two battery-bay latch releases on the bottom of the computer.
b. Remove the battery from the battery bay.
8. Press the power button to ground the system board.
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