Replacing The System Board - Lenovo 7269D7U - Topseller M58e Sff E7500 2.93G 3Gb 320Gb Dvdrw W7p/Xpp Hardware Maintenance Manual

2. Lay the computer on its side.
3. Disconnect the power supply assembly cables from the system board and from all drives. See "System
board connectors" on page 68.
4. Remove the four screws at the rear of the chassis that secure the power supply assembly.
5. Lift the power supply assembly out of the chassis.
6. Ensure that the new power supply assembly is the correct replacement. If your power supply assembly
has a voltage-selection switch, ensure that you set the voltage-selection switch to match the voltage
available at your electrical outlet. If necessary, use a ballpoint pen to slide the switch to a different
position.
• If the voltage supply range in your local country or region is 100–127 V AC, set the switch to 115 V.
• If the voltage supply range in your local country or region is 200–240 V AC, set the switch to 230 V.
7. Install the new power supply assembly into the chassis so that the screw holes in the power supply
assembly align with those in the chassis.
8. Install the four screws to secure the power supply.
Note: Use only the screws provided by Lenovo.
9. Reconnect the power supply cables to the system board and the drives.
10. Go to "Completing the FRU replacement" on page 95.

Replacing the system board

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 opening the computer cover.
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
72
ThinkCentre Hardware Maintenance Manual