Sony PCG-K415B User Manual page 105

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105
Connecting peripheral devices
4 Close the port replicator connector cover on the bottom of your 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 your port replicator completely from the mains voltage, unplug the AC adapter.