DELL 10JEJ ユーザーズマニュアル

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21

Before you start to work on the computer, perform the following steps in the 
sequence indicated:

1

Turn off the computer and all devices.

2

Touch an unpainted metal surface on the computer, such as the metal 
around the card-slot openings at the back of your computer, before 
touching anything inside your computer. 

3

Disconnect the computer and devices from their electrical outlets. 
Doing so reduces the potential for personal injury or shock. Also 
disconnect any telephone or telecommunication lines from the 
computer.

 NOTE: Before disconnecting a device from the computer or removing a 

component from the system board, verify that the standby power light on the 
system board has turned off. See the interior service label located on the inside 
of the cover to locate the standby power light.

While you work, periodically touch an unpainted metal surface on the 
computer to dissipate any static electricity that might harm internal 
components.

In addition, Dell recommends that you periodically review the safety 
instructions in the documentation that came with your computer.

Opening the Computer Cover

You may need to open the computer cover if you are going to remove or 
install a part, reset a forgotten password, or diagnose a computer problem.

  CAUTION: Before you perform this procedure, see " Safety First—

For You and Your Computer" on page 20.

Opening the Cover

1

Turn off the computer and devices, disconnect them from their 
electrical outlets, and wait 10 to 20 seconds.

2

If you have installed a padlock through the padlock ring on the back 
panel, remove the padlock (see the following figure).

3

Lay the computer on its right side.