Lenovo ThinkCentre M73 User Manual page 77

To replace the system fan assembly, 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 36.
3. Remove the front bezel. See "Removing and reinstalling the front bezel" on page 36.
4. Pivot the drive bay assembly upward to gain access to the system fan assembly. See "Accessing the
system board components and drives" on page 38.
5. Remove the hard disk drive for easier access to the system fan assembly. See "Replacing the hard
disk drive" on page 44.
6. Remove the heat sink fan duct. See "Replacing the heat sink and fan assembly" on page 54.
7. Note the cable routing and disconnect the system fan assembly cable from the system fan connector on
the system board. See "Locating parts on the system board" on page 13.
8. The system fan assembly is attached to the chassis by four rubber mounts. Remove the system fan
assembly by cutting the rubber mounts and lifting the system fan assembly out of the chassis.
Note: The new system fan assembly will have four new rubber mounts attached.
Figure 49. Removing the system fan assembly
.
Chapter 5 Installing or replacing hardware
65