HP Pavilion dv4-2116tx Entertainment Notebook PC - Manual (Page 25)

Bottom components
Component Description
(1) Hard drive bay Holds the hard drive and the wireless LAN (WLAN) module.
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.
(2) SmartBay release latch Releases the SmartBay module.
(3) Memory module compartment Contains the 2 memory module slots.
(4) Mini Card compartment Holds the RTC battery and, on select models, holds a
wireless WAN (WWAN) module or a TV tuner card.
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.
(5) Battery release latch Releases the battery from the battery bay.
(6) SIM slot (select models only) Contains a subscriber identity module (SIM). The SIM slot is
located inside the battery bay.
(7) Battery bay Holds the battery.
(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.
Components 13