Lenovo T420 - Manual (Page 88)

3
When installing:
• In models with a wireless LAN card that has two antenna connectors, plug the gray cable into the jack
marked MAIN or M, and the black cable into the jack marked AUX or A on the card. If the computer
you are servicing has three cables, put the white cable in the cable protection tube and secure it with a
tape as shown in this figure.
• In models with a wireless LAN card that has three antenna connectors, plug the gray cable (MAIN) into
the jack marked TR1, the white cable (third) into the jack marked RO or TR3, and the black cable (AUX)
into the jack marked TR2 on the card.
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82 ThinkPad T420 and T420i Hardware Maintenance Manual