Sony PCV-J200 - Vaio Desktop Computer System Reference Manual page 49

Removing, Installing, and Replacing Components
8
Align the memory module over the appropriate socket; note the
location of pin 1 on the module and pin 1 on the socket.
1 1 1 1
Indicates pin 1
9
Carefully but firmly insert the edge of the module into the socket.
✍
Gently push the power supply cables and ribbon cables aside as you slip your hands into
the system to reach the module socket.
Memory module (DIMM)
37
Press down
here
Latches