Sony VGC-LS20 - Manual (Page 17)

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Getting Started
Using the AC Adapter
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Use your computer only with the supplied AC adapter.
To use the AC adapter
1 Plug one end of the power cord (1) into the AC adapter (3).
2 Plug the other end of the power cord into an AC outlet (2).
3 Plug the cable attached to the AC adapter (3) into the DC IN port (4) on the computer.