Dell OptiPlex 320 Quick Reference Manual page 10

Power Connections
NOTICE:
To 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:
In Japan, the voltage selection switch must be set to the 115-V position even though the AC power
available in Japan is 100 V.
6 Verify that the voltage selection switch is set correctly for your location.
Your computer has a manual voltage-selection switch. Computers with a voltage selection switch on
the back panel must be manually set to operate at the correct operating voltage.
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Quick Reference Guide