Sony Vaio PCG-Z505JE Service Manual page 97

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Shut down your computer and disconnect all peripheral devices,
such as your printer.
Unplug the computer and remove the battery packs.
Wait until the computer cools down. Then unscrew the six screws
with the mark on the bottom of your computer.
Slide the LCD lock lever and lift the cover. Slide the keyboard toward
the LCD display, then lift it away slightly.
Lift the keyboard from the LCD display side, then gently turn it over
on the touchpad space. Be careful not to detach the cable when lifting
the keyboard.
If you are adding memory to the PCG-Z505JS/PCG-Z505JSK, you
must remove the existing memory module. Follow the instructions in
"To Remove a Memory Module" on page 63.
Remove the memory module from its packaging.
Install the memory module. Be careful not to touch the other
components of the motherboard.