Lenovo manual ThinkPad T420 and T420i Hardware Maintenance Manual

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Note: Plug the yellow cable into the jack labeled MAIN, and the blue cable into the jack labeled AUX on the card.

If the computer you are servicing is a wireless WAN-ready model and does not have a wireless WAN card, route the antenna cables and secure them with a tape as shown in the following figure.

72ThinkPad T420 and T420i Hardware Maintenance Manual