Lenovo ThinkPad T540p (English) User Guide - Page 99
Replacing a wireless WAN card
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10. Connect the antenna cables to the wireless LAN card. Ensure that you attach the gray cable to the main connector and the black cable to the auxiliary connector on the wireless LAN card. 11. Reinstall the small bottom cover 1 . Then tighten the screw 2 . 12. Reinstall the battery pack. See "Replacing the battery pack" on page 69. 13. Turn the computer over again. Connect the ac power adapter and all cables to the computer. Replacing a wireless WAN card Before you start, print these instructions. Prerequisites for replacing or installing the wireless WAN card DANGER During electrical storms, do not connect the cable to or disconnect it from the telephone outlet on the wall. DANGER Electric current from power, telephone, and communication cables is hazardous. To avoid shock hazard, disconnect the cables before opening the cover of this slot. Chapter 6. Replacing devices 83