Dell Precision 400 Service Manual (.pdf) - Page 54
Precautionary Measures, WARNING FOR YOUR PERSONAL SAFETY AND PROTECTION
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Precautionary Measures Before you perform any of the procedures in this chapter, take a few moments to read the following warning for your personal safety and to prevent damage to the system from ESD. WARNING FOR YOUR PERSONAL SAFETY AND PROTECTION OF THE EQUIPMENT Before you start to work on the computer, perform the following steps in the sequence indicated: 1. Turn off the computer and any attached peripherals. 2. Disconnect the computer and any attached peripherals from their power sources to reduce the potential for personal injury. Also, disconnect any telephone or telecommunication lines from the computer. 3. Wear a wrist grounding strap, and clip it to an unpainted metal surface, such as the padlock ring on the back of the chassis. If a wrist grounding strap is not available, touch an unpainted metal surface on the back of the computer to discharge any static charge from your body. 4-2 Dell WorkStation 400 Systems Service Manual