Sony PCG-K415B User Manual page 31

Troubleshooting the keyboard
A key top has fallen off
If any of the following keys falls off, replace the key top as shown below.
VGN-A series: Caps Lock, Shift, Backspace, Enter, or space bar
PCG-K series: Enter, Caps Lock, Ctrl, Tab, space bar, left Shift
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 hooks (2) on the key unit. Align the centre of the key top and press it
from above (3) until it clicks.
VGN-A series
Caps Lock key, Shift key, Backspace key
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Using your VAIO computer