Removing And Installing The Control-Button Board - Lenovo ThinkCentre M83z Maintenance Manual

9. To install the new internal speakers, position the new internal speakers in the chassis so that each
speaker is secured by the corresponding two tabs on the front bezel.
Figure 27. Installing the internal speakers
10. Route the cables of new internal speakers, and then connect the cables to the system board. See
"Locating parts on the system board" on page 71.
11. Install the rear I/O assembly. See "Replacing the rear I/O assembly" on page 87.
12. Install the system-board shield. See "Removing and installing the system-board shield" on page 86.
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 119.

Removing and installing the control-button board

This section provides instructions on how to remove and install the control-button board.
Attention: Before you replace any FRU, be sure to read and understand Chapter 1 "Safety information" on
page 1. These precautions and guidelines will help you work safely.
CAUTION:
Turn off the computer and wait three to five minutes to let the computer cool before removing the
computer cover.
To remove and install the control-button board, 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 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 stand. See "Removing and installing the computer stand" on page 73.
4. Remove the computer cover. See "Removing the computer cover" on page 76.
5. Slightly press the edge of the control-button board to release it from the latches
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