Sony PCG-R505JL - Manual (Page 43)

Connecting the Docking Station
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1 Pull out the two release levers on either side of the rear corners of the
docking station, to release the notebook from the docking station.
2 Remove the notebook from the docking station, while moving the notebook
slightly back to disengage it from the two front latches of the docking
station.
Releasing the Notebook from the Docking Station
Removing the Notebook from the Docking Station
Pull release levers on either side of
rear corners of docking station