HP ProBook 4320s Notebook PC HP ProBook 4321s ... - Warranty Life

WWAN moduleNOTE: Only select models with include a WWAN module (see Product description on page 1).DescriptionSpare part numberQualcomm EV-DO HSPA 531993-001CAUTION: To prevent an unresponsive system, replace the wireless module only with a wirelessmodule authorized for use in the computer by the governmental agency that regulates wirelessdevices 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 Helpand 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, turnthe 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 outletand then unplugging the AC adapter from the computer.4. Remove the battery (see Battery on page 51).5. Remove the switch cover (see Switch cover on page 53)6. Remove the keyboard (see Keyboard on page 55)Remove the WWAN module:1. Position the computer right-side up with the front toward you.2. Disconnect the WWAN antenna cables (1) from the terminals on the WWAN module.NOTE: The red WWAN antenna cable is connected to the WLAN module “Main” terminal. Theblue 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 module tilts up.)64 Chapter 4 Removal and replacement procedures