Lenovo ThinkPad T420si (English) User Guide - Page 160
Detaching a ThinkPad Port Replicator Series 3, ThinkPad Mini Doc, ThinkPad Mini Dock Plus Series 3
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• If you attach the ThinkPad Port Replicator Series 3, the ThinkPad Mini Dock Series 3, the ThinkPad Mini Dock Plus Series 3, or the ThinkPad Mini Dock Plus Series 3 (170 W) to your computer, but do not connect the ac power adapter of that attachment to the power jack, your computer goes into battery mode. • If your computer and the ThinkPad Port Replicator Series 3, the ThinkPad Mini Dock Series 3, the ThinkPad Mini Dock Plus Series 3, or the ThinkPad Mini Dock Plus Series 3 (170 W) are connected to separate ac power adapters, your computer goes into battery mode first, and then shifts into ac mode. • If in either of the two preceding situations the battery of your computer is detached, or has no battery charge, your computer shuts down. Connecting an external display to the ThinkPad Mini Dock Plus Series 3 and the ThinkPad Mini Dock Plus Series 3 (170 W) Group 1 (top figure) and Group 2 (lower figure) are independent of each other. Each has a DisplayPort and a digital visual interface. If you connect a display to a DisplayPort and a DVI that are in the same group, the DisplayPort is inactive. Detaching a ThinkPad Port Replicator Series 3, ThinkPad Mini Dock Series 3, ThinkPad Mini Dock Plus Series 3, or the ThinkPad Mini Dock Plus Series 3 (170 W) To detach your computer from the ThinkPad Mini Dock Series 3, the ThinkPad Mini Dock Plus Series 3, or the ThinkPad Mini Dock Plus Series 3 (170 W), do the following: 1. Make sure that: • The devices connected to USB connectors are not in use. • The Ethernet connection has been stopped. • The devices connected to an eSATA port are not in use (ThinkPad Mini Dock Plus Series 3 and ThinkPad Mini Dock Plus Series 3 (170 W)). 144 User Guide