HP 621 Compaq 320, 321, 420, 421, 620, 621 Notebook PCs and HP 420, 620 Notebo - Page 71

Heat sink, Remove the Phillips PM2.0×3.0 screw

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3. Remove the Phillips PM2.0×3.0 screw (2) that secures the fan, and then remove the fan (3). Reverse this procedure to install the fan. Heat sink NOTE: The heat sink spare part kit includes replacement thermal material. Description Heat sink for use in computers with UMA graphics subsystems Heat sink for use in computers with discrete graphics subsystems Spare part number 605749-001 605750-001 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 service door (see Service door on page 49). 6. Remove the fan (see Fan on page 60). Remove the heat sink on computers with UMA graphics subsystems: 1. Position the computer right-side up with the front facing you. 2. Following the sequence stamped into the heat sink, loosen the captive screws (1) and (2) around the processor. Component replacement procedures 61

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3.
Remove the Phillips PM2.0×3.0 screw
(2)
that secures the fan, and then remove the fan
(3)
.
Reverse this procedure to install the fan.
Heat sink
NOTE:
The heat sink spare part kit includes replacement thermal material.
Description
Spare part number
Heat sink for use in computers with UMA graphics subsystems
605749-001
Heat sink for use in computers with discrete graphics subsystems
605750-001
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 service door (see
Service door
on page
49
).
6.
Remove the fan (see
Fan
on page
60
).
Remove the heat sink on computers with UMA graphics subsystems:
1.
Position the computer right-side up with the front facing you.
2.
Following the sequence stamped into the heat sink, loosen the captive screws
(1)
and
(2)
around the processor.
Component replacement procedures
61