Lenovo THINKCENTRE 4485 - Manual (Page 166)

Figure 97. Installing the new internal speaker
9. Reconnect the internal speaker cable to the system board. See “Locating parts on the system board”
on page 77.
10. Position the cover presence switch so that the screw hole in the cover presence switch is aligned with
the corresponding hole in the chassis.
158 ThinkCentre Hardware Maintenance Manual