Lenovo Z40-75 - Manual (Page 45)

Appendix A. CRU instructions
39
Replacing the wireless LAN card - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
To replace the wireless LAN card, do the following:
1 Turn off the computer; then disconnect the AC power adapter and all
cables from the computer.
2 Close the computer display, and then turn the computer over.
3 Remove the battery pack.
4 Remove the Optical drive/Hard disk drive/Memory/Central processing
unit/Mini PCI Express Card slot compartment cover.
5 Disconnect the two wireless LAN cables (one black, one grey) .
Note: The wireless LAN card in select models may have only one cable (black).
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