Lenovo IdeaCentre B520 - Manual (Page 37)

Chapter 8. Replacing hardware
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6. Push the optical drive so that it slides out of the drive bay.
7. Push a small iron stick (e.g.a paper clip) into the small hole on the
optical drive cover so that the optical drive springs out as shown.
8. Remove the 2 screws that secure the optical drive to the metal bracket. 1
9. Use a small flat head screwdriver to press and push out the pins that
secure the cover to the optical drive. 2 3