Sony VGN-AR170GU1 - Manual (Page 93)

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Using Peripheral Devices
3 Adjust the position of the size adjuster (4) to match the size of your computer.
4 Tighten the screw on the bottom of the multi function bay docking station.
5 Plug the power cord (5) into the AC adapter (6) and an AC outlet.
6 Plug the cable attached to the AC adapter (6) into the DC IN port (7) on the multi function bay docking station.