Dell OptiPlex GX270 Manuel d'utilisateur télécharger pdf (Page 11)

Setup and Quick Reference Guide 9

When Using Your Computer

As you use your computer, observe the following safe-handling guidelines.

CAUTION: Do not operate your computer with any cover(s) (including computer covers,

bezels, filler brackets, front-panel inserts, and so on) removed.

• Your computer is equipped with one of the following:

– A fixed-voltage power supply — Computers with a fixed-voltage power supply do not have a

voltage selection switch on the back panel and operate at only one voltage (see the regulatory

label on the outside of the computer for its operating voltage).

– An auto-sensing voltage circuit — Computers with an auto-sensing voltage circuit do not have a

voltage selection switch on the back panel and automatically detect the correct operating voltage.

– 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.

Set the switch to the position that most closely matches the voltage used in your location.

NOTICE: 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. For Japan, 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.

• Before working inside the computer, unplug the computer 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.

When Working Inside Your Computer

Before you open the computer cover, perform the following steps in the sequence indicated.

CAUTION: Do not attempt to service the computer yourself, except as explained in your online

Dell™ documentation or in instructions otherwise provided to you by Dell. Always follow

installation and service instructions closely.

NOTICE: To help avoid possible damage to the system board, wait 5 seconds after turning off the computer

before removing a component from the system board or disconnecting a device from the computer.

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Dell OptiPlex GX270 Manuel d'utilisateur Page 11