Lenovo ThinkCentre M90z Hardware Maintenance Manual for ThinkCentre M90z - Page 98

8. Connect the new ambient light sensor cable to the system board. See "System board connectors" on page 70. 9. Go to "Completing the parts replacement" on page 110. Replacing the ExpressCard 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 ExpressCard. Note: The ExpressCard is available only in some models. To replace the ExpressCard, 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 71. 4. Locate the ExpressCard in the computer. See "FRU locations" on page 69. 5. Carefully remove the four screws 1 that secure the ExpressCard to the system board and then lift it off the system board. Figure 30. Removing the ExpressCard 92 ThinkCentre Hardware Maintenance Manual