Lenovo ThinkCentre M91p 4524 Hardware Maintenance 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.
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ThinkCentre Hardware Maintenance Manual