HP ProBook 4525s Maintenance And Service Manual page 70

CAUTION:
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 computer functionality, and then contact technical support through Help
and Support.
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
5. Remove the switch cover and keyboard (see
Remove the WWAN module:
1. Position the computer right-side up with the front toward you.
2. Remove the protective gasket that is adhered to the top of the WWAN module.
3. Disconnect the WWAN antenna cables (1) from the terminals on the WWAN module.
NOTE:
blue WWAN antenna cable is connected to the WWAN module "Aux" terminal. The terminals
and cables are both identified by number and color.
62 Chapter 4 Removal and replacement procedures
To prevent an unresponsive system, replace the wireless module only with a wireless
Battery on page
The red WWAN antenna cable is connected to the WWAN module "Main" terminal. The
48).
Switch cover and keyboard on page 49).