Lenovo IdeaCentre K330B - Manual (Page 39)

Chapter 7. Replacing hardware
37
5. Install the new system fan assembly by aligning the rubber mounts of
the system fan assembly with the holes on the chassis and push the
rubber mounts through the holes.
6. Pull on the tips of the rubber mounts until the fan assembly is in place.
7. Connect the system fan assembly cable to the system fan connector
on the system board.
8. Refer to the “Completing the installation”.