Lenovo X200 - Manual (Page 119)

Table 19. Removal steps of PCI Express Mini Card for wireless WAN (continued)
3
When installing: When you install the card, plug the red cable into the jack
labeled MAIN on the card, and the blue cable into the jack labeled AUX.
If the computer you are servicing is the wireless WAN-ready model, put the
antenna cables in the cable protection tube and place them as shown in this
figure.
Removing and replacing a FRU 111