Lenovo ThinkCentre M91p (English) User Guide - Page 61

Replacing the ac power adapter

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7. Completely remove the front audio and USB assembly bracket from the chassis. 8. Remove the two screws that secure the front audio and USB assembly to its bracket and remove the failing front audio and USB assembly from the bracket. 9. Install a new front audio and USB assembly into the bracket and install the two screws to secure the front audio and USB assembly to the bracket. 10. Install the front audio and USB assembly bracket into the chassis and align the screw hole in the bracket with the corresponding hole in the chassis. Figure 33. Installing the front audio and USB assembly 11. Install the screw to secure the front audio and USB assembly bracket to the chassis. 12. Install the new power switch assembly into the chassis. 13. Connect the front USB, front panel, and front audio cables to the system board. See "Locating parts on the system board" on page 10. 14. Reinstall the front bezel. See "Removing and reinstalling the front bezel" on page 28. What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the installation or replacement, go to "Completing the parts replacement" on page 51. Replacing the ac power adapter Attention: Do not open your computer or attempt any repair before reading and understanding the "Important safety information" on page vii. This section provides instructions on how to replace the ac power adapter. Chapter 5. Installing or replacing hardware 47

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7. Completely remove the front audio and USB assembly bracket from the chassis.
8. Remove the two screws that secure the front audio and USB assembly to its bracket and remove the
failing front audio and USB assembly from the bracket.
9. Install a new front audio and USB assembly into the bracket and install the two screws to secure the
front audio and USB assembly to the bracket.
10. Install the front audio and USB assembly bracket into the chassis and align the screw hole in the
bracket with the corresponding hole in the chassis.
Figure 33. Installing the front audio and USB assembly
11. Install the screw to secure the front audio and USB assembly bracket to the chassis.
12. Install the new power switch assembly into the chassis.
13. Connect the front USB, front panel, and front audio cables to the system board. See “Locating parts on
the system board” on page 10.
14. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 28.
What to do next:
•
To work with another piece of hardware, go to the appropriate section.
•
To complete the installation or replacement, go to “Completing the parts replacement” on page 51.
Replacing the ac power adapter
Attention:
Do not open your computer or attempt any repair before reading and understanding the “Important safety information”
on page vii.
This section provides instructions on how to replace the ac power adapter.
Chapter 5
.
Installing or replacing hardware
47