Replacing The Power Supply Assembly - Lenovo ThinkStation 4353 Hardware Maintenance Manual

Replacing the power supply assembly

Attention:
Do not open your computer or attempt any repair before reading and understanding the "Important Safety
Information" on page 1.
This document provides instructions on how to replace the power supply assembly.
CAUTION:
Never remove the cover on a power supply or any part that has the following label attached.
Hazardous voltage, current, and energy levels are present inside any component that has this label
attached. There are no serviceable parts inside these components.
CAUTION:
The heat sink and microprocessor might be very hot. Turn off the computer and wait
three to five minutes to let the computer cool before removing the computer cover.
To replace the power supply assembly, do the following:
1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Remove any locking device that secures the computer cover, such as a padlock or an integrated
cable lock.
3. Remove the computer cover. See "Removing the computer cover" on page 82.
4. Place the computer on its side to gain easier access to the power supply.
5. Disconnect the power supply assembly cables from the system board and the drives. In some models,
you might need to disconnect the power supply assembly cables from the Peripheral Component
Interconnect (PCI) cards.
6. Remove the six screws that secure the power supply as shown in the following illustration.
.
Chapter 10 Replacing FRUs
123