Sony VPCZ22SHX - Manual (Page 116)

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Using Peripheral Devices >
Connecting a Docking Station
Alternatively, you can disconnect the docking station from the computer as follows:
1 Click Start, the arrow next to the Shut down button, and Undock.
2 Make sure that a message balloon appears and the IN USE indicator light turns off. Then unplug the docking station
connector from the computer.
✍
To disconnect the docking station completely from AC power, unplug the AC adapter.