Lenovo ThinkCentre M90 Hardware Maintenance Manual page 130

3. Remove the front bezel by releasing the three plastic tabs and pivoting the front bezel outward.
Figure 64. Removing the front bezel
4. Pivot the optical drive bay assembly upward to gain access to the internal speaker.
5. Locate the internal speaker. See "Locating components" on page 103.
6. Disconnect the internal speaker cable and the thermal sensor cable from the internal speaker connector
and the thermal sensor connector on the system board. See "Locating parts on the system board" on
page 104.
7. Push the two tabs
then lift the internal speaker up to completely remove it from the chassis.
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ThinkCentre Hardware Maintenance Manual
1 on the bottom of the internal speaker as shown to release the internal speaker, and