Lenovo ThinkCentre M77 Hardware Maintenance Manual (HMM) - ThinkCentre M77 - Page 109

6. Insert the two tabs 2 of the new front fan assembly into the corresponding holes in the chassis, and press the other two tabs 1 through the holes until the front fan assembly is secured in place. Figure 39. Installing the front fan assembly 7. Connect the front fan assembly cable to the power fan connector on the system board. 8. To complete the replacement, go to "Completing the parts replacement" on page 112. Replacing the rear fan Attention: Do not open your computer or attempt any repair before reading and understanding the "Important safety information" in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy of the ThinkCentre Safety and Warranty Guide, go to: http://support.lenovo.com This section provides instructions on how to replace the rear fan. To replace the rear fan, do the following: 1. Turn off the computer and disconnect all power cords from electrical outlets. 2. Remove the computer cover. See "Removing the computer cover" on page 79. 3. Locate the rear fan. See "Locating components" on page 76. 4. Disconnect the rear fan cable from the system fan connector on the system board. See "Locating parts on the system board" on page 77. Chapter 8. Replacing FRUs (Machine Types: 1982, 1983, 1985, 1986, 1987, 1990, 1992, 1993, 1994, and 1995.) 105