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External component identification

Maintenance and Service Guide 2–7

Bottom components

Item Component Description

1 Subscriber identity module (SIM) slot

(select models only)

Located inside the battery bay.

2 Battery bay Holds the battery.

3 Battery release latch Releases the battery from the battery bay.

4 Vents (6) Enable airflow to cool internal components.

✎

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.

5 Memory module compartment Contains the memory module slot (2 slots on select models) and a wireless

LAN module.

✎

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.

6 Hard drive bay Holds the hard drive and wireless wide area network (WWAN) module (select

models only).

✎