Maintenance and Service Guide

WLAN module
Table 5-4 WLAN module description and spare part number information
Description Spare part number
Qualcomm Atheros QCA6174A-5 ac 2×2 + Bluetooth 4.2 M.2 2230 PCI-e WW with 2 antennas L54597-001
CAUTION: To prevent an unresponsive system, replace the wireless module only with a wireless module
authorized for use in the computer by the governmental agency that regulates wireless devices in your country
or region. If you replace the module and then receive a warning message, remove the module to restore device
functionality, and then contact technical support.
Before removing the WLAN module, follow these steps:
1. Turn o the computer. If you are unsure whether the computer is o or in Hibernation, turn the computer
on, and then shut it down through the operating system.
2. Disconnect the power from the computer by rst unplugging the power cord from the AC outlet, and then
unplugging the AC adapter from the computer.
3. Disconnect all external devices from the computer.
4. Remove the keyboard/top cover (see Keyboard/top cover on page 25).
5. Disconnect the battery cable from the system board (see Battery on page 33).
Remove the WLAN module:
1. Disconnect the WLAN antenna cables (1) from the WLAN module.
NOTE: The #1/white WLAN antenna cable connects to the WLAN module "#1/Main" terminal. The #2/
black WLAN antenna cable connects to the WLAN module "#2/Aux" terminal.
2. Remove the Phillips M2.0×7.0 screw (2) that secures the WLAN module to the system board.
The WLAN module rises up.
3. Remove the WLAN module (3) by pulling the module away from the slot at an angle.
Reverse this procedure to install the WLAN module.
34 Chapter 5 Removal and replacement procedures