Lenovo ThinkCentre 3026 Maintenance Instructions Manual page 150

Figure 65. Removing the internal speaker
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Hardware Maintenance Manual
7. Push the two tabs 1 on the bottom of the internal speaker as shown to
release the internal speaker, and then lift the internal speaker up to completely
remove it from the chassis.
8. Remove the attached thermal sensor cable from the old internal speaker and
install it on the new internal speaker.