Lenovo ThinkCentre M91p Hardware Maintenance Manual - Page 100
Replacing the ac power adapter, the system board
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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 31. 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 71. 14. Reinstall the front bezel. See "Removing and reinstalling the front bezel" on page 73. 15. Go to "Completing the parts replacement" on page 98. Replacing the ac power adapter Attention: Do not open your computer or attempt any repair before reading and understanding the "Important safety information" in the ThinkCentre User Guide. To obtain a copy of the ThinkCentre User Guide, go to: http://www.lenovo.com/ThinkCentreUserGuides This section provides instructions on how to replace the ac power adapter. 94 ThinkCentre Hardware Maintenance Manual