Lenovo ThinkPad SL400c Hardware Maintenance Manual page 79

Table 18. Removal steps of PCI Express Mini Card (half size) for wireless LAN (continued)
4
When installing: In models with wireless LAN card that has two antenna
connectors, plug the black cable with gray label into the jack labeled MAIN, and
the black cable with black label into the jack labeled AUX on the card. If the
computer you are servicing has three cables, put the white cable in the cable
holder.
In models with wireless LAN card that has three antenna connectors, plug the
black cable with gray label (MAIN) into the jack labeled TR1, the black cable with
white label (3rd) into jack labeled TR3, and the black cable with black label (AUX)
into jack labeled TR2 on the card.
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ThinkPad SL400, SL400c, SL500, and SL500c