Sony PCG-K315B Hardware Manual page 25

Troubleshooting keyboard
A key top has fallen off
If the Enter key, the Caps Lock key, the Ctrl key, the Tab key, the space bar key, or the left Shift key falls off, replace the key top as
shown below.
If any other key top falls off, place it back into position and push it in from above until it clicks.
To replace a key top
Remove the wire (1) from the key top, then attach it to the hook (2) on the key unit. Align the centre of the key top and press it
from above (3) until it clicks.
Enter key, Caps Lock key, Ctrl key, Tab key
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Using your VAIO computer