Lenovo ThinkStation S20 4157 Hardware Manual page 164

This section provides instructions on how to replace the hard disk drive fan
assembly.
To replace the hard disk drive fan assembly:
1. Remove the computer cover. See "Removing the cover" on page 96.
2. Locate the hard disk drive fan assembly. See "Locations" on page 97.
3. Unlatch and open the adapter card retainer.
4. Press the hard disk drive fan assembly bracket latch downwards and pivot the
5. Disconnect the hard disk drive fan assembly cable from the system board.
6. The hard disk drive fan assembly is attached to the bracket by four rubber
7. Install the new hard disk drive fan assembly by aligning the rubber mounts of
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bracket to remove it from the chassis.
mounts 1 . Remove the fan assembly by gently pulling it out of the bracket.
the fan assembly with the holes in the hard disk drive fan assembly bracket
and pushing the rubber mounts through the holes.