HP ProBook 4420s HP ProBook 4320s, 4321s, 4420s, and 4421s Notebook PCs - Mai - Page 82

Heat sink and fan

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Heat sink and fan NOTE: The heat sink spare part kit includes replacement thermal material. Description Fan Processor heat sink For use with discrete graphics subsystems For use with Unified Memory Architecture (UMA) graphics subsystems Spare part number 599544-001 599653-001 599546-001 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 49). 5. Remove the following components: a. Switch cover (see Switch cover on page 51) b. Keyboard (see Keyboard on page 53) c. Palm rest (see Palm rest on page 64) Remove the heat sink: 1. Position the computer right-side up with the front toward you. 2. Remove the six Phillips PM2.5×3.0 screws (1) that secure the heat shield to the top cover. 3. Remove the Phillips PM2.5×5.0 screw (2) that secures the heat shield to the top cover. 74 Chapter 4 Removal and replacement procedures

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Heat sink and fan
NOTE:
The heat sink spare part kit includes replacement thermal material.
Description
Spare part number
Fan
599544-001
Processor heat sink
For use with discrete graphics subsystems
599653-001
For use with Unified Memory Architecture (UMA) graphics subsystems
599546-001
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
49
).
5.
Remove the following components:
a.
Switch cover (see
Switch cover
on page
51
)
b.
Keyboard (see
Keyboard
on page
53
)
c.
Palm rest (see
Palm rest
on page
64
)
Remove the heat sink:
1.
Position the computer right-side up with the front toward you.
2.
Remove the six Phillips PM2.5×3.0 screws
(1)
that secure the heat shield to the top cover.
3.
Remove the Phillips PM2.5×5.0 screw
(2)
that secures the heat shield to the top cover.
74
Chapter 4
Removal and replacement procedures