Lenovo IdeaCentre B520 - Manual (Page 38)

Hardware Maintenance Manual
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10. Separate the cover from the defective optical drive.
11. Install the new optical drive as follows:
(1) Align the new optical drive with the cover, then push the cover
back into position.
(2) Secure the metal bracket onto the new optical drive using the 2
screws.
(3) Slide the new optical drive into the drive bay.
12. Secure the new optical drive to the chassis using the screw.
13. Slide the computer cover back into position.