Lenovo ThinkCentre M73 10B0 Hardware Maintenance Manual page 198

1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Pull the tab 1 and then slide the ac power adapter bracket as shown to remove it from the VESA
mount bracket.
Figure 148. Removing the ac power adapter bracket
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ThinkCentre M73 Hardware Maintenance Manual