Dell OptiPlex GX240 - Manual (Page 15)

Setup and Quick Reference Guide 13
NOTE: The voltage selection switch must be set to the 115V position
even though the AC supply in Japan is 100 V.
– 230 V/50 Hz in most of Europe, the Middle East, and the Far East
Also be sure your monitor and attached peripherals are electrically
rated to operate with the AC power available in your location.
NOTE: Auto-select power supplies do not require a voltage selection
switch. Your power supply may not have this switch.
• To help prevent electric shock, plug the computer and peripheral
power cables into properly grounded power sources. These cables are
equipped with three-prong plugs to help ensure proper grounding. Do
not use adapter plugs or remove the grounding prong from a cable. If
you must use an extension cable, use a three-wire cable with properly
grounded plugs.
• Before working inside the computer, unplug the system to help prevent
electric shock or system board damage. Certain system board
components continue to receive power any time the computer is
connected to AC power.
• To help avoid possible damage to the system board, wait 15 seconds
after unplugging the system before disconnecting a device from the
computer.
NOTICE: Observe when the auxiliary power light-emitting diode (LED)
indicator on the system board turns off to verify that system power is off (see
your
User’s Guide for the location of this LED).