Lenovo 3000 C305 All-In-One - Manual (Page 54)

Hardware Maintenance Manual
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4. Pull the system fan away from the chassis.
5. Align the four screw holes on the new system fan to the four mounting
holes on the chassis.
6. Insert and tighten the four screws to secure the system fan.
7. Connect the system fan cable to the system board.
8. Install the LCD panel. Refer to steps 5 to 6 of the “Replacing the LCD