SIM slot board
NOTE: This section applies only to computer models with WWAN capability.
Description Spare part number
SIM slot board 443907-001
Before removing the SIM slot board, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet and
then unplugging the AC adapter from the computer.
4. Remove the battery (see
Battery on page 46).
5. Remove the following components:
a. Hard drive (see
Hard drive on page 50)
b. Memory/WLAN module compartment cover (see
Expansion memory module on page 54)
c. Optical drive (see
Optical drive on page 60)
d. Keyboard (see
Keyboard on page 62)
e. Switch cover (see
Switch cover on page 68)
f. Fan (see
Fan on page 69)
g. Heat sink (see
Heat sink on page 71)
h. Display assembly (see
Display assembly on page 75)
i. Top cover (see
Top cover on page 79)
j. System board (see
System board on page 86)
Remove the SIM slot board:
1. Turn the system board right-side up, with the front toward you.
92 Chapter 4 Removal and replacement procedures
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