Lenovo 64575KU Hardware Maintenance Manual page 76

Removing and replacing a FRU
When installing: Plug the gray cable into the jack labeled MAIN on the card, and
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MT 6463, 6464, 6465, 6466, 6467, 6478, 6471, 6457, 6458, 6459, 6460, 6461, 6462, and 6470
the black cable into the jack labeled AUX. If the computer you
are servicing has three cables, put the white cable in the cable
bag in the card slot.
After you secured the card, make sure that the antenna cables
are routed as shown in the following figure.