4–40 Maintenance and Service Guide
Removal and replacement procedures
Reverse this procedure to install the modem module cable.
Fan/heat sink assembly
✎
The fan/heat sink assembly spare kit includes replacement thermal material.
✎
To properly ventilate the computer, allow at least a 7.6-cm (3-inch) clearance on the right side and rear panel 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 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 4-6).
5. Remove the following components:
a. Hard drive (see “Hard drive” on page 4-14)
b. Optical drive (see “Optical drive” on page 4-9)
c. Switch cover and keyboard (see “Switch cover and keyboard” on page 4-18)
d. Display assembly (see “Display assembly” on page 4-24)
e. Top cover (see “Top cover” on page 4-30)
f. USB board (see “USB board” on page 4-35)
g. System board (see “System board” on page 4-37)
Remove the fan/heat sink assembly:
Description Spare part number
For use only with computer models equipped with graphics subsystems with discrete
memory
579158-001
