HP mt42 Maintenance and Service Guide - Page 53

Heat sink/fan assembly

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Heat sink/fan assembly NOTE: The heat sink/fan assembly spare part kit includes replacement thermal material. Description Heat sink/thermal module with fans Spare part number 821163-001 Before removing the heat sink/fan assembly, follow these steps: 1. Turn off 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 the power from the computer by unplugging the power cord from the computer. 3. Disconnect all external devices from the computer. 4. Bottom cover (see Bottom cover on page 25). 5. Remove the battery (see Battery on page 28). 6. Remove the internal base plate (see Internal base plate on page 41). Remove the heat sink/fan assembly: ▲ Loosen the six captive screws on the fan and heat sink following the sequence stamped on the heat sink (1), disconnect the fan cable (2), and then remove the heat sink/fan assembly from the system board (3). CAUTION: Take extreme care when removing the heat sink and fan assembly. The heatpipes between the fans are very fragile and can be easily damaged and bent during removal. NOTE: The thermal material must be thoroughly cleaned from the surfaces of the heat sink and the system board components each time the heat sink is removed. Replacement thermal material is included with the heat sink, processor, and system board spare part kits. Component replacement procedures 43

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Heat sink/fan assembly
NOTE:
The heat sink/fan assembly spare part kit includes replacement thermal material.
Description
Spare part number
Heat sink/thermal module with fans
821163-001
Before removing the heat sink/fan assembly, follow these steps:
1.
Turn
off
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 the power from the computer by unplugging the power cord from the computer.
3.
Disconnect all external devices from the computer.
4.
Bottom cover (see
Bottom cover
on page
25
).
5.
Remove the battery (see
Battery
on page
28
).
6.
Remove the internal base plate (see
Internal base plate
on page
41
).
Remove the heat sink/fan assembly:
▲
Loosen the six captive screws on the fan and heat sink following the sequence stamped on the heat sink
(1)
, disconnect the fan cable
(2)
, and then remove the heat sink/fan assembly from the system board
(3)
.
CAUTION:
Take extreme care when removing the heat sink and fan assembly. The heatpipes between
the fans are very fragile and can be easily damaged and bent during removal.
NOTE:
The thermal material must be thoroughly cleaned from the surfaces of the heat sink and the
system board components each time the heat sink is removed. Replacement thermal material is
included with the heat sink, processor, and system board spare part kits.
Component replacement procedures
43