Sony VGN-TXN17P - Manual (Page 76)

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Using Peripheral Devices
Disconnecting Your Computer from the Port Replicator
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To prevent loss of unsaved data, be sure to turn off your computer before disconnecting it from the port replicator.
To disconnect your computer from the port replicator
1 Turn off the computer and the connected peripherals.
2 Lift the computer away from the port replicator.
3 Close the port replicator connector cover on the bottom of the computer.
✍
It is extremely important to close the port replicator connector cover after disconnecting your computer from the port replicator. If the cover is left open,
dust may get inside and damage the computer.
To disconnect the port replicator completely from AC power, unplug the AC adapter.