HP ProBook 450 G2, Maintenance And Service Manual, Page: 26 / 169

Component Description
(5) num lk key Alternates between the navigational and numeric functions on
the integrated numeric keypad.
(6) Integrated numeric keypad When num lk has been enabled, it can be used like an external
numeric keypad.
Bottom
NOTE: Refer to the illustration that most closely matches your computer.
Component Description
(1) Vents (2) 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.
(2) Service door Provides access to the hard drive bay and the memory
module slots.
(3) Battery release latch Releases the battery.
14 Chapter 2 External component identification