Sony PCV-LX920 - Manual (Page 50)

VAIO Slimtop System Reference Manual 38
4 Align the module over the appropriate socket; note the location of pin
1 on the module and pin 1 on the socket.
5 Carefully but firmly insert the edge of the module into the socket.
6
Press down firmly and evenly at both corners until the module is
fully seated.
✍
When the module is fully seated, the latches on each side are straight up and
locked into the slot on each side of the module. If the latches are not completely
straight upright, continue to press down on each side of the module until the
latches lock into place.
1
Indicates pin 1
Memory module (DIMM)