Sony PCV-E203 - Manual (Page 30)

VAIO MicroTower System Reference 22
Removing the Side Panel
You must remove the side panel to access the system board, add-in cards,
power supply, battery, and internal drives.
1
From the rear of the unit, remove the two thumb screws that secure
the panel to the chassis.
2 Slide the side panel back with your right hand as you hold the chassis
in position with your left hand. The panel slides back about ½ inch.
3
Pull the panel straight out to remove it.
KY0064.VSD