Dell OptiPlex DCM, Setup And Quick Reference Manual

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support.dell.com Setup and Quick Reference Guide 15
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As you use your computer system, observe the following safety guidelines.
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To help avoid damaging your computer, be sure the voltage selection switch on
the power supply is set to match the AC power available at your location:
— 115 volts (V)/60 hertz (Hz) in most of North and South America and some
Far Eastern countries such as South Korea and Taiwan
— 100 V/50 Hz in eastern Japan and 100 V/60 Hz in western Japan
NOTE: The AC power available in Japan is 100 volts (V), but the voltage
selection switch must be set to the 115V position.
— 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.
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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.
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To help avoid possible damage to the system board, wait 15 seconds after
unplugging the system before disconnecting a device from the computer.
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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.