Sony PCV-RS310 - Manual (Page 51)

Upgrading and Maintaining Components 37
8 Press down evenly against the module's upper corners. The latches
snap into position, holding the module in place.
9
Reinstall any components or add-on cards you may have removed.
10
Replace the cover. See “Replacing the cover.”
!
To avoid damaging a memory module slot, move the end latches slightly
outward to relieve pressure. The module clicks into place.