Dell Latitude 5420 Owner's Manual page 6

CAUTION: When you disconnect a cable, pull on its connector or on
its pull-tab, not on the cable itself. Some cables have connectors with
locking tabs; if you are disconnecting this type of cable, press in on
the locking tabs before you disconnect the cable. As you pull
connectors apart, keep them evenly aligned to avoid bending any
connector pins. Also, before you connect a cable, ensure that both
connectors are correctly oriented and aligned.
NOTE: The color of your computer and certain components may appear
differently than shown in this document.
To avoid damaging your computer, perform the following steps before you begin
working inside the computer.
1. Ensure that your work surface is flat and clean to prevent the computer
cover from being scratched.
2. Turn off your computer (see
3. If the computer is connected to a docking device (docked) such as the
optional Media Base or Battery Slice, undock it.
CAUTION:
from your computer and then unplug the cable from the
network device.
4. Disconnect all network cables from the computer.
5. Disconnect your computer and all attached devices from their electrical
outlets.
6. Close the display and turn the computer upside-down on a flat work
surface.
NOTE:
main battery before you service the computer.
7. Remove the main battery (see Battery).
8. Turn the computer top-side up.
9. Open the display.
10. Press the power button to ground the system board.
CAUTION:
your computer from the electrical outlet before opening the
display.
Turning Off Your
To disconnect a network cable, first unplug the cable
To avoid damaging the system board, you must remove the
To guard against electrical shock, always unplug
Computer).