Lenovo ThinkCentre 3231 Hardware Maintenance Manual page 162

Figure 65. Installing the new internal speaker
10. Go to "Completing the FRU replacement" on page 158.
156
Hardware Maintenance Manual
8. Align the four tabs on the bottom of the new internal speaker with the
corresponding holes in the chassis, and push the new internal speaker straight
down until it snaps into position.
Note: Carefully place the thermal sensor cable so that it will not impede
installing the new internal speaker.
9. Reconnect the internal speaker cable and the thermal sensor cable to the
system board.