Lenovo IdeaCentre H520g Hardware Maintenance Manual page 85

Figure 17. Removing the optical drive
5. Slide the new optical drive into the drive bay from the front and align the screw holes in the new optical
drive with the corresponding holes in the drive bay. Then, install the three screws to secure the new
optical drive in place.
Figure 18. Installing the optical drive
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Chapter 9 Replacing FRUs