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Removal and replacement procedures
Maintenance and Service Guide 4–51
Fan and heat sink
✎
The fan and heat sink spare part kits include replacement thermal material.
✎
To properly ventilate the computer, allow at least 7.6 cm (3 in) of 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 and heat sink, 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. Hard drive (see “Hard drive” on page 4-9)
b. Memory/wireless module compartment cover (see “WLAN module” on page 4-12)
c. Optical drive (see “Optical drive” on page 4-18)
d. Keyboard and switch cover (see “Keyboard and switch cover” on page 4-20)
e. Palm rest (see “Palm rest” on page 4-25)
f. Display assembly (see “Display assembly” on page 4-27)
g. Top cover (see “Top cover” on page 4-36)
h. System board (see “System board” on page 4-47)
Description Spare part number
Fan 577206-001
Description Spare part number
Heat sink for use only on computer models equipped with a graphics subsystem with discrete
memory
577227-001
Heat sink for use only on computer models equipped with a graphics subsystem with UMA memory 577226-001