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2–10 Maintenance and Service Guide
External component identification
Bottom components
Item Component Description
1 Hard Drive bay Holds the hard drive and, on select models, the wireless LAN (WLAN) device.
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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.
2 Memory Module compartment Contains the two memory module slots.
3 Mini Card compartment Holds the real-time clock (RTC) battery and, on select models, the WLAN
device.
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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 Release latch Releases the battery from the battery bay.
5 Battery bay Holds the battery.
6 Vents (3) Enable airflow to cool internal components.
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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.