HP C9K75UT User Manual download pdf (Page 51)

Heat sink

Description Spare part number

Heat sink 689938-001

NOTE: To properly ventilate the computer, allow at least 7.6 cm (3 in) of 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.

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 base enclosure (see

Base enclosure on page 29).

5. Disconnect the battery cable (see

Battery on page 31),

6. Remove the system board (see

System board on page 39).

Remove the heat sink:

1. From the system board, remove the 4 Phillips PM screws securing the heat sink (1) to the

system board.

CAUTION: These screws must be removed in the sequence that is marked on the heat sink so

that the correct pressure is applied to the processor and other components.

Component replacement procedures 43

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HP C9K75UT User Manual Page 51