Dell OptiPlex GX280 - Manual (Page 281)

1 power connector Insert the power cable.
2 voltage selection
switch (may not be
available on all
computers)
Your computer is equipped with either an auto-sensing voltage selector or a manual voltage
selection switch. Computers with an auto-sensing voltage selector do not have a voltage selection
switch on the back panel and can automatically detect the correct operating voltage.
To help avoid damaging a computer with a manual voltage selection switch, set the switch for the
voltage that most closely matches the AC power available in your location.
NOTICE: The voltage selection switch must be set to the 115-V position even though the AC
power available in Japan is 100 V.
Also, ensure that your monitor and attached devices are electrically rated to operate with the AC
power available in your location.
3 back panel
connectors
Plug serial, USB, and other devices into the appropriate connector.
4 card slots Access connectors for any installed PCI and PCI Express cards.