Lenovo 4220 Laptop User Manual


 
Figure 35. Installing the front fan assembly
7. Connect the front fan assembly cable to the power fan connector on the system board.
8. Reinstall the secondary hard disk drive if removed. See “Replacing the secondary hard disk drive”
on page 93.
9. To complete the replacement, go to “Completing the FRU replacement” on page 103.
Replacing the rear fan assembly
Attention
Do not open your computer or attempt any repair before reading and understanding the “Important safety
information” in the ThinkStation Safety and Warranty Guide that came with your computer. To obtain a copy
of the ThinkStation Safety and Warranty Guide, go to:
http://www.lenovo.com/support
This section provides instructions on how to replace the rear fan assembly.
To replace the rear 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 73.
3. Locate the rear fan assembly. See “Locating components” on page 70.
98 Hardware Maintenance Manual