HP ProBook 4446s HP ProBook 4445s Notebook PC HP ProBook 4446s Notebook PC - M - Page 56

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4. Lift the fan at an angle to remove it from the computer (3). Reverse this procedure to install the fan. NOTE: 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. Top cover Description Top cover with TouchPad for use in models with a fingerprint reader Top cover with TouchPad for use in models without a fingerprint reader Spare part number 683666-001 683667-001 Before removing the top cover, 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 following components: a. Battery (see Battery on page 33) b. Bottom door (see Bottom door on page 34). 48 Chapter 4 Removal and replacement procedures

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4.
Lift the fan at an angle to remove it from the computer
(3)
.
Reverse this procedure to install the fan.
NOTE:
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.
Top cover
Description
Spare part number
Top cover with TouchPad for use in models with a fingerprint reader
683666-001
Top cover with TouchPad for use in models without a fingerprint reader
683667-001
Before removing the top cover, 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 following components:
a.
Battery (see
Battery
on page
33
)
b.
Bottom door (see
Bottom door
on page
34
).
48
Chapter 4
Removal and replacement procedures