Bottom - HP Pavilion dm1-4200 Maintenance And Service Manual

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16 Chapter 2 External component identification
Component
Battery bay
SIM slot (select models only)
Battery/service door latch
Vent
Service door
Description
Holds the battery.
Supports a wireless subscriber identity module (SIM).
The SIM slot is located inside the battery bay.
Releases the battery from the battery bay.
Enables 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.
Provides access to the hard drive bay, a memory
module slot, the SIM slot (select models only), the
WLAN module, and the WWAN module (select
models only).