Lenovo 410554U Hardware Maintenance Manual page 87

Hazardous voltage, current, and energy levels are present inside any component that has this label attached.
There are no servicable parts inside these components.
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 on how to remove or 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 76.
2. Locate the power supply assembly. See "Locations" on page 77.
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.
5. Remove the five screws at the rear of the chassis that secure the power supply.
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Chapter 10 Replacing FRUs (Type 4105, 4157, 4217)
81