Sony PCV-RX640 - Manual (Page 36)

VAIO Digital Studio System Reference Manual 24
Removing the Side Cover
You must remove the side cover to access the system board, add-in cards,
power supply, battery, memory, and internal drives.
1
From the rear of the unit, pull the metal tab shown in the next
diagram.
2
Pull the top of the side cover away from the unit about two inches,
then gently lift out the side cover.