Lenovo 3000 Hardware Maintenance Manual page 162

4. Install the new rear fan assembly by aligning the rubber mounts of the system
5. Pull on the tips of the rubber mounts until the fan assembly is in place.
6. Route the fan cable to the system board and connect the cable to the system
7. Go to "Completing the FRU replacement" on page 161.
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Hardware Maintenance Manual
fan assembly with the holes on the chassis and push the rubber mounts
through the holes.
board. See "Locating parts on the system board" on page 125.