Sony PCV-RX560 - Manual (Page 103)

Removing the side cover
1. Shut down your computer and turn off all peripheral devices, such as your printer.
2. Unplug your computer and any peripheral devices.
3. Locate the tab on the upper right side of the rear panel, and pull it back until the side cover releases.
4. Lift the side cover away from the unit and set aside.
Removing the side cover
Page 103