Lenovo ThinkCentre Edge 91z Hardware Maintenance Manual page 132

To replace the WI-FI card, 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 other flat 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 95.
4. Remove the system board shield. See "Removing and reinstalling the system board shield" on page 102.
5. Locate the WI-FI card on the system board. See "FRU locations" on page 86.
6. Remove the rear I/O assembly. See "Replacing the rear I/O assembly" on page 100.
7. Disconnect the two cables from the WI-FI card, and then carefully remove the screw that secures
the WI-FI card to the system board.
Figure 51. Removing the screw that secures the WI-FI card to the system board
8. Pivot the WI-FI card upward and lift the WI-FI card out of the mini PCI Express slot.
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ThinkCentre Hardware Maintenance Manual