Lenovo C4 Series User Manual page 54

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 two 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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User Guide