Lenovo ThinkStation P900 User Manual page 134

CAUTION:
The heat sink and fan assembly might be very hot. Before you open the computer cover, turn off the
computer and wait several minutes until the computer is cool.
Depending on your computer model, your computer might be installed with one or two heat sink and
fan assemblies.
To replace the heat sink and fan assemblies, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove the computer cover. See "Removing the computer cover" on page 77.
3. Remove the direct cooling air baffle. See "Removing and reinstalling the direct cooling air baffle"
on page 94.
4. Lay the computer on its side for easier access to the heat sink and fan assembly.
5. Locate the heat sink and fan assembly that does not work properly. See "Locating components"
on page 4.
6. Disconnect the heat sink and fan assembly cable from the system board.
7. Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the
system board:
a. Partially remove screw
b. Partially remove screw
Note: Carefully remove the four screws from the system board to avoid any possible damage to the
system board. The four screws cannot be removed from the heat sink and fan assembly.
Figure 63. Removing the heat sink and fan assembly
8. Lift the failing heat sink and fan assembly off the system board.
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ThinkStation P900 User Guide
1 , then fully remove screw
3 , then fully remove screw
2 , and then fully remove screw
4 , and then fully remove screw
1 .
3 .