Sony PCG-FX390K - Manual (Page 80)

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Removing a Memory Module
1 Shut down your notebook and disconnect all peripheral devices, such as your
printer.
2 Unplug the notebook and remove the battery pack(s).
3 After the notebook has cooled, loosen and remove the screw that secures the
cover of the memory bay on the bottom of your notebook. Use an
appropriate screwdriver.
4 Touch a metal object (such as the connector panel on the back of your
notebook) to discharge any static electricity.
5 Remove the memory module.
Removing the memory module cover
Screwdriver
Screw