Sony VGN-AR170GU1 - Manual (Page 98)

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Using Peripheral Devices
Alternatively, you can disconnect the computer from the multi function bay docking station as follows:
1 Click Start and then Undock Computer.
2 Make sure that a message balloon appears and the IN USE indicator turns off, and then press the PUSH RELEASE
button.
3 Lift the computer away from the multi function bay docking station.
4 Close the multi function bay docking station connector cover on the bottom of the computer.
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It is extremely important to close the multi function bay docking station connector cover after disconnecting the computer from the multi function bay
docking station. If the cover is left open, dust may get inside and damage the computer.
To disconnect the multi function bay docking station completely from AC power, unplug the AC adapter.