HP Pavilion dm4-1018tx Entertainment Notebook PC - Manual (Page 18)

Bottom components
Component Description
(1) Battery bay Holds the battery.
(2) Battery release latch Releases the battery from the battery bay.
(3) Vents (6) 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.
(4) Hard drive bay Holds the hard drive.
(5) Memory/wireless module compartment Holds a wireless LAN module, a wireless WAN module, and
memory modules.
NOTE: 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.
Wireless antennas
On select computer models, at least two antennas send and receive signals from one or more
wireless devices. These antennas are not visible from the outside of the computer.
8 Chapter 1 Features