Lenovo ThinkPad T420si (English) User Guide - Page 158
Attaching a ThinkPad Port Replicator Series 3, ThinkPad Mini Doc
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Note: If you attach your computer to the ThinkPad Mini Dock Plus Series 3 or the ThinkPad Mini Dock Plus Series 3 (170 W) and use an external monitor connector, use the external monitor connector on the ThinkPad Mini Dock Plus Series 3 or the ThinkPad Mini Dock Plus Series 3 (170 W), not the one on the computer. 10 When you attach a mechanical lock to the security keyhole, the eject button is locked so that the computer cannot be removed from the ThinkPad Mini Dock Plus Series 3 or the ThinkPad Mini Dock Plus Series 3 (170 W). Attaching a ThinkPad Port Replicator Series 3, ThinkPad Mini Dock Series 3, ThinkPad Mini Dock Plus Series 3, or ThinkPad Mini Dock Plus Series 3 (170 W) To attach your computer to a ThinkPad Port Replicator Series 3, a ThinkPad Mini Dock Series 3, a ThinkPad Mini Dock Plus Series 3, or a ThinkPad Mini Dock Plus Series 3 (170 W), do the following: The following drawings are for the ThinkPad Mini Dock Series 3, the ThinkPad Mini Dock Plus Series 3, or the ThinkPad Mini Dock Plus Series 3 (170 W). The procedure is the same for the ThinkPad Port Replicator Series 3. Notes: • Before you attach the computer to a ThinkPad Port Replicator Series 3, a ThinkPad Mini Dock Series 3, a ThinkPad Mini Dock Plus Series 3, or a ThinkPad Mini Dock Plus Series 3 (170 W), disconnect an ac power adapter from the computer. • If your computer is operating, make sure that it has finished any operations involving devices that are connected to a USB connector and a USB/eSATA connector. Also make sure that any Ethernet connection has stopped. • Before you attach your computer to a ThinkPad Mini Dock Series 3, a ThinkPad Mini Dock Plus Series 3, or a ThinkPad Mini Dock Plus Series 3 (170 W), make sure that the system lock key is in place and in the unlocked (horizontal) position. • For ThinkPad Mini Dock Plus Series 3 (170 W), use the 170 ac power adapter and U.S. power cord shipped with your computer. 1. To attach your computer, make sure that the system lock key is in place and in the unlocked (horizontal) position for the ThinkPad Mini Dock Series 3, the ThinkPad Mini Dock Plus Series 3, or the ThinkPad Mini Dock Plus Series 3 (170 W). Make sure that the mechanical lock is detached for the ThinkPad Port Replicator Series 3. 142 User Guide