Sony PCG-K415B User Manual page 174

PCG-K series
To change or add a memory module, proceed as follows:
1 Shut down your computer and disconnect all peripheral devices.
2 Unplug the computer and remove the battery.
3 Wait until the computer cools down.
4 Unscrew the screw on the bottom of the computer and remove the memory module compartment cover.
5 Touch a metal object (such as the connector panel on the back of the computer) to discharge static electricity.
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Upgrading your VAIO computer