HP EliteBook 755 G2 Notebook PC - Manual (Page 22)

Component Description
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.
(6) SIM slot (select models only) Supports a wireless subscriber identity module (SIM).
The SIM slot is located inside the battery bay.
Component Description
(1) 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. To access Help and Support, select
Start > Help and Support.
(2) Service door release latch Releases the service door.
12 Chapter 2 Getting to know your computer