HP ProBook 4325s HP ProBook 4325s, 4326s and 4425s Notebook PCs - Maintenance - Page 79

Heat sink and fan, Remove the Phillips PM2.5×5.0 screw

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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 615575-001 615576-001 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 44). 5. Remove the following components: a. Switch cover (see Switch cover on page 46) b. Keyboard (see Keyboard on page 48) c. Palm rest (see Palm rest on page 60) 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. Component replacement procedures 71

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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
615575-001
For use with Unified Memory Architecture (UMA) graphics subsystems
615576-001
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
44
).
5.
Remove the following components:
a.
Switch cover (see
Switch cover
on page
46
)
b.
Keyboard (see
Keyboard
on page
48
)
c.
Palm rest (see
Palm rest
on page
60
)
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.
Component replacement procedures
71