Lenovo ThinkStation S20 4157 Hardware Manual page 145

Attention
Do not open your computer or attempt any repair before reading and understanding the
"Important safety information" in the ThinkStation Safety and Warranty Guide that came
with your computer. To obtain a copy of the ThinkStation Safety and Warranty Guide, go to:
http://www.lenovo.com/support
This section provides information about how to move and replace the power
supply.
To replace the power supply, do the following:
1. Remove the computer cover and then lay the computer on its side. See
"Removing the cover" on page 96.
2. Locate the power supply. See "Locations" on page 97.
3. Disconnect the power supply cables from the system board connectors.
Disconnect the power supply cables from all adapter cards (some models) and
from all drives.
4. Remove the power supply cables from the cable clips and ties.
Chapter 11. Replacing FRUs - Ibiza Computers
139