Sony PCG-F420 - Manual (Page 19)

Connecting a Power Source '
Connecting a Power Source
You can use either AC power or a rechargeable battery pack as a power
source.
Using the AC Adapter
1
Plug the cable attached to the AC adapter into the DC In connector on
the computer.
2
Plug one end of the power cord into the AC adapter.
3
Plug the other end of the power cord into an AC outlet.
Notebook
DC In
AC adapter
(supplied)
Power cord (supplied)