Acer 6800 Series - Manual (Page 35)

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Connecting the power cable
Caution: Before you proceed, check the voltage range in your
area. Make sure that it matches your computer's voltage setting. If
they don't match, change your computer's voltage setting
according to your area's voltage range.
Set the voltage selector switch to the voltage range applicable to your area (a).
Plug the power cable into the power cable socket located on the rear panel of
your computer (b). Then plug the other end of the power cable into a power
outlet (c).