Lenovo 5248 - Manual (Page 46)

6. Connect the new ExpressCard to the ExpressCard connector on the system board. Align the screw
holes in the new ExpressCard with the corresponding holes in the system board and then install the four
screws to secure the new ExpressCard.
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 50.
Replacing the internal speakers
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 internal speakers.
To replace the internal speakers, 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 cover. See “Removing the computer cover” on page 14.
4. Remove the rear I/O assembly cover. See “Removing or reinstalling the rear I/O assembly cover”
on page 17.
5. Locate the internal speakers in the computer. See “Component locations” on page 10.
6. Note the location of the internal speaker cable connection. Note the routing of the internal speaker
cables. Disconnect the internal speaker cables from the system board.
38 ThinkCentre User Guide