HP Dv4 1540us Service Guide - Page 73

WWAN module Description WWAN modules HP EVDO-A WWAN module for use in the United States HP un2400 Mobile Broadband Module HP UMTS/HSDPA/EDGE WWAN module, including GPRS Spare part number 451131-002 483377-001 459350-001 CAUTION: The WWAN module and the WLAN module are not interchangeable. 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 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 Battery on page 55). Remove the WWAN module: 1. Loosen the Phillips PM2.5×6.0 captive screw (1) that secures the WWAN module cover to the computer. (The edge of the module opposite the slot rises away from the computer.) 2. Lift the inside edge of the cover and slide out to disengage the tabs (2). 3. Remove the cover (3). 4. Disconnect the WWAN antenna cables (1) from the terminals on the WWAN module. Component replacement procedures 65