Lenovo ThinkPad L421 (English) User Guide - Page 144
If your computer and the ThinkPad Port Replicator Series 3, the ThinkPad Mini Dock Series 3, or
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3. Put your computer on the platform of the ThinkPad Mini Dock Series 3, or the ThinkPad Mini Dock Plus Series 3, making sure that the top-left corner of the computer is aligned to the guide plate on the ThinkPad Mini Dock Series 3, or the ThinkPad Mini Dock Plus Series 3. 4. Insert your computer into the ThinkPad Mini Dock Series 3, or the ThinkPad Mini Dock Plus Series 3, along the surface, until you hear a click. The computer is now attached to the ThinkPad Mini Dock Series 3, or the ThinkPad Mini Dock Plus Series 3. Note: If the docking indicator is not lighted after you attach the ThinkPad Mini Dock Series 3, or the ThinkPad Mini Dock Plus Series 3, your computer is not properly connected to the dock. Check the ac power adapter of the dock, or disconnect and re-attach the ac power adapter. Then attach your computer to the dock. Notes: • If you attach the ThinkPad Port Replicator Series 3, the ThinkPad Mini Dock Series 3, or the ThinkPad Mini Dock Plus Series 3, 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, or the ThinkPad Mini Dock Plus Series 3 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. 126 User Guide