Lenovo ThinkServer User Manual page 162

Depending on the model, your server might come with one or two front system fans. See "Server
components" on page 25 to locate the front system fan(s) installed in your server model.
Note: The front system fan 2 is only available in server models with five to eight 3.5-inch hot-swap hard disk
drives installed. The front system fan 2 should only be factory-installed. Lenovo does not support users
and servicers to install a secondary front system fan by themselves.
CAUTION:
Hazardous moving parts. Keep fingers and other body parts away.
Before you begin, print all the related instructions or ensure that you can view the PDF version on another
computer for reference.
Note: Depending on the model, your server might look slightly different from the illustrations in this topic.
To replace the front system fan, do the following:
1. Remove all media from the drives and turn off all attached devices and the server. Then, disconnect all
power cords from electrical outlets and disconnect all cables that are connected to the server.
2. Remove the server cover. See "Removing the server cover" on page 85.
3. Locate the front system fan 1. See "Server components" on page 25.
4. Disconnect the front system fan 1 cable from the 4-pin system fan 1 connector on the system board.
See "System board components" on page 42.
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ThinkServer User Guide