Lenovo IdeaCentre B520 - Manual (Page 53)

Chapter 8. Replacing hardware
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8. Pull the WLAN card upward to remove it from the card port.
9. Separate the WLAN card from the metal bracket by removing the 2 screws.
10. Secure the new WLAN card to the metal bracket with the 2 screws.
11. Line the new WLAN card up with the card port and secure it with the
screw.
12. Connect the antenna cables to the new WLAN card.