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6.
Disconnect the CPU heatsink fan cable from the system board (1), as shown in the following
figure.
Figure 5-80
7.
Before lifting the heatsink, gently twist the heatsink to break the thermal compound between the
CPU and the heatsink.
8.
Lift the CPU heatsink out of the chassis (2).
9.
Use alcohol and a soft cloth to clean the thermal interface residue from the CPU and the heatsink,
allowing the alcohol on the CPU and CPU heatsink to dry completely.

Installing the CPU heatsink

To install a heatsink:
1.
Disconnect power from the system
2.
Remove the side access panel (see
3.
If your system has an airflow guide, remove it (see
4.
Remove the CPU heatsink (see
5.
Perform one of the following tasks:
If you are reusing the original heatsink, apply thermal compound to the center of the CPU top
surface.
If you are using a new CPU heatsink, do not apply thermal compound to the CPU because
the new heatsink already has thermal compound applied to the heatsink surface. Instead,
remove the thermal compound protective liner from the bottom of the new heatsink.
ENWW
Disconnecting the heatsink fan cable
(Predisassembly procedures on page
Removing the side access panel on page
Removing the CPU heatsink on page
75).
Removing the airflow guide on page
154).
Removing and installing components
78).
110).
155

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