Sony PCV-RX791 - Manual (Page 38)

VAIO Digital Studio System Reference Manual 26
Removing the Side Panel
You must remove the side panel to access the system board, add-in cards,
power supply, battery, memory, and internal drives.
1
Locate the tab on the upper right side of the rear panel, and pull it
back until the side panel releases.
2
Lift the side panel away from the unit and set aside.