HP ProBook 4325s HP ProBook 4325s, 4326s and 4425s Notebook PCs - Maintenance - Page 65
WWAN module
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WWAN module NOTE: Only select models include a WWAN module (see Product description on page 1). Description Qualcomm EV-DO HSPA Spare part number 531993-001 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 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 44). 5. Remove the switch cover (see Switch cover on page 46) 6. Remove the keyboard (see Keyboard on page 48) Remove the WWAN module: 1. Position the computer right-side up with the front toward you. Component replacement procedures 57