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WWAN module
CAUTION: The WWAN module and the WLAN module are not interchangeable.
Description Spare part number
Ericsson F5321 HSPA+ with GPS 668969-001
Sierra MC8355 (Gobi3000) HSPA/CDMA 634400-001
Before removing the WWAN module, 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 31).
5. Remove the bottom door (see
Bottom door on page 33).
Remove the WWAN module:
1. Position the computer upside-down.
2. Disconnect the WWAN antenna cables (1) from the terminals on the WWAN module.
NOTE: The red WWAN antenna cable is connected to the WWAN module “Main” terminal. The
blue WWAN antenna cable is connected to the WWAN module “Aux” terminal.
3. Remove the two Phillips PM2.5×3.0 screws (2) that secure the WWAN module to the computer.
(The edge of the module opposite the slot rises away from the computer.)
Component replacement procedures 41