Dell Dimension 8300 - Manual (Page 10)

10 Safety Instructions
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SAFETY: 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.
SAFETY: 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.
1 Perform an orderly computer shutdown using the operating system menu.
2 Turn off your computer and any devices connected to the computer.
3 Ground yourself by touching an unpainted metal surface on the chassis, such as the metal around the card-slot
openings at the back of the computer, before touching anything inside your computer.
While you work, periodically touch an unpainted metal surface on the computer chassis to dissipate any static
electricity that might harm internal components.
4 Disconnect your computer and devices, including the monitor, from their electrical outlets. Also, disconnect any
telephone or telecommunication lines from the computer.
Doing so reduces the potential for personal injury or shock.