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4. Position the replacement memory module over the memory slot. Make sure the notch 1 on the memory
module aligns correctly with the slot key 2 on the system board. Push the memory module straight
down into the slot until the retaining clips close.
Figure 8. Installing the memory module
5. Go to “Completing the FRU replacement” on page 103.
Replacing the power supply
Attention
Do not open your computer or attempt any repair before reading and understanding the “Important safety information”
in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy of the ThinkCentre
Safety and Warranty Guide, go to:
http://www.lenovo.com/support
This section provides instructions on how to replace the power supply.
Attention
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.
To replace the power supply:
1. Remove the computer cover. See “Removing the computer cover” on page 73.
2. Disconnect the power supply cables from the system board and from all drives. See “Locating parts on
the system board” on page 76.
3. Lay the computer on its side and remove the four screws at the rear of the chassis that secure the
power supply.
Chapter 8. Replacing FRUs (Machine Types: 3063, 3231, 3285, 4084, 4085, 4086, 4087, 6138, 6209, 6239, 6302, 7188, 7244,
7347, 7355, 7358, 7373, 7484, 7571, 7628, 7635, 7639, 8494, 8854, 9728, 9960, and 9965.) 79