HP Pavilion dv3-4001tx Entertainment Notebook PC - Manual (Page 18)

Bottom components
Component Description
(1) Hard drive bay Holds the hard drive.
(2) 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.
(3) 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.
(4) Battery bay Holds the battery.
(5) Battery release latch Releases the battery from the battery bay.
Wireless antennas
On select computer models, at least 2 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 Notebook tour