Lenovo ThinkPad T420si (English) User Guide - Page 153
Mini Dock Series 3., Port Replicator Series 3.
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3 The sliding adjuster is a guide up the docking connector on your computer as you attach the ThinkPad Port Replicator Series 3. 4 The docking connector is where you attach your computer. ThinkPad Mini Dock Series 3 1 The power switch turns the computer on and off. 2 The key lock indicator lights when the system lock key is in the locked position. When the system lock key is in the locked position, the eject button of the ThinkPad Mini Dock Series 3 is locked; you cannot attach or remove your computer. 3 The docking indicator lights when your computer is docked. 4 The eject button releases the computer from the ThinkPad Mini Dock Series 3 when pressed. 5 The sliding adjuster is a guide up the docking connector on your computer as you attach the ThinkPad Mini Dock Series 3. 6 The docking connector is where you attach your computer. 7 The system lock key is for locking the eject button. Chapter 7. Enhancing your computer 137