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NOTE: If the WLAN antenna cables are not connected to the terminals on the WLAN module,
protective sleeves should be installed on the antenna connectors, as shown in the following illustration.
Reverse this procedure to install the WWAN module.
Power connector cable
Description Spare part number
Power connector cable 740148-001
Before removing the power connector cable, follow these steps:
1. Turn off 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 the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
4. Remove the keyboard/top cover (see
Keyboard/top cover on page 23).
5. Disconnect the battery cable from the system board (see
Speakers on page 26).
6. Remove the USB board (see
USB board on page 35).
Remove the power connector cable:
1. Disconnect the power connector cable (1) from the system board.
2. Release the power connector cable from the retention clips/channel (2) built into the
base enclosure.
38 Chapter 4 Removal and replacement procedures preliminary requirements