Lenovo ThinkCentre M53 Hardware Maintenance Manual page 122

6. Align the two screw holes in the external optical drive metal plate with the corresponding holes in
the new external optical drive and then install the two screws to secure the metal plate on the new
external optical drive.
Figure 21. Installing the external optical drive metal plate
7. Slide the new external optical drive into the external optical drive box until it snaps into position.
Figure 22. Installing the external optical drive into the external optical drive box
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ThinkCentre M53 Hardware Maintenance Manual