Sony VAIO VAIO PCG505F User Manual page 20

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You can use either AC power or a rechargeable battery pack as a power
source.
Plug the cable attached to the AC adapter into the DC In connector on
the computer.
Pull the prong on the AC adapter upwards and plug it into an AC
outlet.
Unplug the AC adapter from the AC outlet and the adapter cable
from the DC In connector on the computer.
Align the adapter cable with the groove on the AC adapter and wrap
the cable around the AC adapter.