Lenovo ThinkCentre M81 7518 User Manual page 74

Figure 46. Installing the new internal speaker
9. Reconnect the internal speaker cable to the system board. See "Locating parts on the system board"
on page 11.
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.
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ThinkCentre User Guide