HP NH303EPABA, AS322USABA, NG879UPABA manual Fan

Fan

Description	Spare part number
Fan (includes thermal material)	492568-001

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 requirements. Exhaust air is displaced through the ventilation grill located on the left side of the computer.

Before removing the fan, 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 46).

5.Remove the following components:

a.Primary hard drive (see Primary hard drive on page 55)

b.Optical drive (see Optical drive on page 60) or Secondary hard drive (see Secondary hard drive on page 67)

c.Switch cover and keyboard (see Switch cover and keyboard on page 62)

d.Display assembly (see Display assembly on page 73)

e.Top cover (see Top cover on page 79)

f.System board (see System board on page 86)

Remove the fan:

1.Turn the system board upside down with the front toward you.

2.Remove the Phillips PM2.5×4.0 screw (1) securing the fan to the system board.

3.Disconnect the cable from the system board (2).

92 Chapter 4 Removal and replacement procedures