Replacing the microprocessor fan. Lenovo E73z, 10Bl

4. Remove the system board shield. See “Removing and reinstalling the system board shield” on page 83.

5. Remove the VESA mount bracket. See “Removing the VESA mount bracket” on page 86.

6. Locate the power supply. See “Locating major FRUs and CRUs” on page 66.

7. Disconnect the power supply cables from the system board. See “Locating parts on the system board” on page 69.

8. Remove the power cord connector from the rear I/O bracket. See “Replacing the rear I/O assembly” on page 84.

9. Remove the two screws 1 that secure the power supply, and then remove the power supply from the computer.

Figure 25. Removing the two screws that secure the power supply

10. To reinstall the power supply, reinstall the power cord connector to the rear I/O bracket. See “Replacing the rear I/O assembly” on page 84

11. Position the new power supply in the computer and align the two screw holes in the new power supply with those in the computer main bracket. Install the two screws to secure the new power supply.

12. Route the new power cord connector cable, and then reinstall the rear I/O assembly. See “Replacing the rear I/O assembly” on page 84.

13. Connect the new power supply cables to the power supply connectors on the system board. See

“Locating parts on the system board” on page 69.

14. Reinstall the VESA mount bracket. See “Removing the VESA mount bracket” on page 86.

15. Reinstall the system board shield. See “Removing and reinstalling the system board shield” on page 83.

16. Reinstall the computer cover. See “Removing the computer cover” on page 75.

17. Go to “Completing the parts replacement” on page 108.

Replacing the microprocessor fan

Attention: Do not open your computer or attempt any repair before reading and understanding the

“Important safety information” on page 1

This section provides instructions on how to replace the microprocessor fan.

88 ThinkCentre E73z Hardware Maintenance Manual

To replace the microprocessor fan, 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. Place a soft, clean towel or cloth on the desk or other flat surface. Hold the sides of your computer and gently lay it down so that the screen is against the surface and the cover is facing up.

3. Remove the computer cover. See “Removing the computer cover” on page 75.

4. Locate the microprocessor fan in the computer. See “Locating major FRUs and CRUs” on page 66.

5. Remove the microprocessor board shield. See “Removing and reinstalling the system board shield” on page 83.

6. Remove the rear I/O assembly. See “Replacing the rear I/O assembly” on page 84.

7. Remove the VESA mount bracket. See “Removing the VESA mount bracket” on page 86.

8. Note the routing of the microprocessor fan cable, and then disconnect the microprocessor fan cable

from the system board. See “Locating parts on the system board” on page 69.

9. Remove the two screws 1 that secure the microprocessor fan to the main bracket. Then, lift the microprocessor fan off the main bracket.

Figure 26. Removing the microprocessor fan

10. To reinstall the microprocessor fan, position the new microprocessor fan on the main bracket and align the screw holes in the new microprocessor fan with those in the main bracket. Reinstall the two screws that secure the microprocessor fan to the main bracket.

11. Connect the new microprocessor fan cable to the system board. See “Locating parts on the system board” on page 69.

12. Reinstall the VESA mount bracket. See “Removing the VESA mount bracket” on page 86.

13. Reinstall the rear I/O assembly. See “Replacing the rear I/O assembly” on page 84.

14. Reinstall the system board shield. See “Removing and reinstalling the system board shield” on page 83.

15. Reinstall the computer cover. See “Removing the computer cover” on page 75.

16. Go to “Completing the parts replacement” on page 108.

Chapter 9 .

Replacing FRUs

89