Lenovo 7099B8U, Hardware Maintenance Manual

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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. Remove the computer cover. See “Removing the computer cover” on page 71.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 72.
4. Disconnect the front audio and USB assembly cables from the system board. See “Locating parts on
the system board” on page 69.
5. Note the front audio and USB assembly cable routing and remove the screw that secures the front audio
and USB assembly. Then, remove the front audio and USB assembly from the chassis.
Figure 29. Removing the front audio and USB assembly
6. Route the cables of the new front audio and USB assembly through the hole in the chassis.
7. Position the new front audio and USB assembly to the chassis so that the screw hole in the new front
audio and USB assembly is aligned with the corresponding hole in the chassis.
8. Install the screw to secure the new front audio and USB assembly in place.
9. Connect the new front audio and USB assembly cables to the system board. See “Locating parts on the
system board” on page 69.
10. Reinstall the front bezel. See “Removing and reinstalling the front bezel” on page 72.
11. To complete the replacement, go to “Completing the parts replacement” on page 94.
Replacing the system board
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 system board.
Chapter 8
.
Replacing FRUs (Machine Types: 0864, 7099, and 7846.)
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