Lenovo IdeaCentre B3 Series User Manual page 54

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