Lenovo ThinkCentre M77 1990 User Manual page 73

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 32.
3. Locate the internal speaker connector on the system board. See "Locating parts on the system board"
on page 11.
4. Disconnect the internal speaker cable from the system board.
5. Push the metal tab 1
to completely remove it from the chassis.
Figure 46. Removing the old internal speaker
on the top of the internal speaker outward and slide the internal speaker upward
.
Chapter 5 Installing or replacing hardware
61