HP ZBook 17 manual Wlan module slot, the Wwan module slot

Component		Description
(8)	Vents (3)	Enable airflow to cool internal components.
		NOTE: The computer fan starts up automatically to
		cool internal components and prevent overheating. It is
		normal for the internal fan to cycle on and off during
		routine operation.
(9)	Service door	Provides access to the hard drive bay, the wireless LAN
		(WLAN) module slot, the WWAN module slot, and the
		memory module slots.

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 support through HP Support Assistant. To access HP Support Assistant in Windows 8, on the Start screen, select the HP Support Assistant app. To access Help and Support in Windows 7, select Start > Help and Support.

20 Chapter 2 External component identification