5. Disconnect the heatsink screws from the system board (1) as shown in the following figure.
Figure 5-57 Disconnecting the heatsink screws
6. Before lifting the heatsink, gently twist the heatsink to break the thermal compound between the
CPU and the heatsink.
7. Lift the CPU heatsink out of the chassis (2).
8. Use alcohol and a soft cloth to clean the thermal interface residue from the CPU and the heatsink.
Let the alcohol on the CPU and CPU heatsink dry completely.
Installing the CPU heatsink
To install a heatsink:
1. Prepare the computer for servicing by following the
Predisassembly procedures on page 68.
CAUTION: Failure to follow the predisassembly procedures can result in equipment damage or
data loss.
2. Remove the access panel (see Removing the access panel on page 71).
3. Remove the airflow guide.
4. Perform one of the following tasks:
●
If you are reusing the original heatsink, clean the old themal compound from the bottom of
the heatsink, then apply a new layer of thermal compound to the center of the CPU top surface.
●
If you are using a new CPU heatsink, remove the thermal compound protective liner from the
bottom of the new heatsink. (New heatsinks already have thermal compound on the heatsink
surface.)
5. Align the heatsink's four mounting screws with the mounting holes in the chassis.
6. Carefully place the heatsink on the CPU.
7. Tighten each heatsink screw a little at a time to ensure that the CPU stays level. Do not fully tighten
one screw and then move on to the next.
8. Tighten each set of diagonally opposed screws a little at a time to 6 in.-lbs. of torque.
ENWW Removing and installing components 119
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