Sony VAIO VGN-Z500 Series - Manual (Page 83)

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Using Peripheral Devices
To disconnect your computer from the docking station
1 Press the UNDOCK button (1) and wait until the IN USE indicator (2) turns off.
✍
If the IN USE indicator is unlit, you do not have to press the UNDOCK button.
Pressing the UNDOCK button while your computer is in a power saving mode returns the computer to Normal mode first, and then initiates the
disconnection process.
!
Once you have placed your computer back in Normal mode, be sure to remove your computer from the docking station. Use of the computer still on
the docking station may cause unstable operations.