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Removal and replacement procedures
Maintenance and Service Guide 4–39
Fan/heat sink assembly
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The fan/heat sink assembly spare part kit includes replacement thermal material.
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To properly ventilate the computer, allow at least a 7.6-cm (3-in) clearance on the left side of the computer. The
computer uses an electric fan for ventilation. The fan is controlled by a temperature sensor and is designed to
turn on automatically when high temperature conditions exist. These conditions are affected by high external
temperatures, system power consumption, power management/battery conservation configurations, battery fast
charging, and software requirements. Exhaust air is displaced through the ventilation grill located on the left side
of the computer.
Before removing the fan/heat sink assembly, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the computer on,
and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet and then
unplugging the AC adapter from the computer.
4. Remove the battery (see “Battery” on page 4-7).
5. Remove the following components:
a. Wireless module compartment cover (see “WLAN module” on page 4-8).
b. Hard drive (see “Hard drive” on page 4-10).
c. Optical drive (see “Optical drive” on page 4-15).
d. Keyboard (see “Keyboard” on page 4-16).
e. Keyboard cover (see “Keyboard cover” on page 4-18).
f. Display assembly (see “Display assembly” on page 4-21).
g. Top cover (see “Top cover” on page 4-29).
h. System board (see “System board” on page 4-36).
Description Spare part number
For use with discrete systems 580719-001
For use with UMA systems 580718-001