Lenovo IdeaCentre B520 Hardware Replacement Manual page 21

7. Push a small iron stick (paper clip) into the small hole on the optical drive cover
so that the disk springs out as shown.
8. Remove the 2 screws that secure the optical drive to the metal bracket.
9. Use a small flat head screwdriver to press and push out the pins that secure
the cover to the disk.
10. Separate the cover from the defective optical drive.
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Hardware Replacement Guide