System information

Fan/heat sink assembly
Description Spare part number
Fan/heat sink assembly (includes thermal material) 448625-001
NOTE: 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 applications.
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 36).
5.
Remove the following components:
a.
Hard drive (see
Hard drive on page 37)
b.
Optical drive (see
Optical drive on page 44)
c.
Keyboard (see
Keyboard on page 46)
d.
Switch cover (see
Switch cover on page 49)
e.
Display assembly (see
Display assembly on page 51)
f.
Top cover (see
Top cover on page 57)
g.
Wireless switch board (see
Wireless switch board on page 62)
h.
Audio board (see
Audio board on page 66)
i.
Bluetooth module (see
Bluetooth module on page 67)
j.
USB board (see
USB board on page 68)
k.
System board (see
System board on page 73)
78 Chapter 4 Removal and replacement procedures ENWW