Lenovo H405 Hardware Maintenance Manual page 57

3. Disconnect the system fan assembly cable from the system board. Refer
to"Identifying parts on the system board".
4. Pull the system fan assembly out of the chassis.
5. Install the new system fan assembly by aligning the rubber mounts of
the system fan assembly with the holes on the chassis and then push
the rubber mounts through the holes.
Chapter 9. Replacing hardware
55