Lenovo ThinkCentre E73 User Manual page 82

1. Remove the WiFi adapter card from the computer, and then disconnect the front and rear WiFi antenna
cables from the WiFi card module.
Figure 51. Removing the WiFi antenna cables
2. Remove the two screws that secure the WiFi card module to the WiFi adapter card.
Figure 52. Removing the screws that secure the WiFi card module
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ThinkCentre E73 User Guide