Lenovo ThinkCentre M73z Hardware Maintenance Manual page 116

8. To install the new Wi-Fi card, insert the notched end of the new Wi-Fi card into the mini PCI express
card slot at an angle of about 20 degrees. Ensure that the Wi-Fi card is inserted firmly. Then, pivot
the Wi-Fi card downward so that the screw hole in the Wi-Fi card aligns with the mounting stud
on the system board.
Figure 49. Installing the Wi-Fi card
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ThinkCentre M73z Hardware Maintenance Manual