Dell 4100/200, 4100/180 manual Safety Instructions, When Working Inside the Computer

Safety Instructions

Use the following safety guidelines to help protect your computer system from potential damage and to ensure your own personal safety.

When Working Inside the Computer

WARNING: The power supplies in this computer system produce high voltages and energy hazards, which can cause bodily harm. Only trained service technicians are authorized to remove the computer covers and access any of the components inside the computer.

Before taking the covers off of the computer, perform the following steps in the sequence indicated:

1.Turn off the computer and any peripherals.

2.Disconnect the computer and peripherals from their power sources. Also, disconnect any tele- phone or telecommunications lines from the computer.

Doing so reduces the potential for personal injury or shock.

3.Touch an unpainted metal surface on the com- puter chassis, such as the power supply, before touching anything inside the computer.

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

In addition, take note of these safety guidelines when appropriate:

•To help avoid possible damage to the system board, wait five seconds after turning off the system before removing a component from the system board or dis- connecting a peripheral device from the computer.

•When you disconnect a cable, pull on its connector or on its strain-relief loop, not on the cable itself. Some cables have a connector with locking tabs; if you are disconnecting this type of cable, press in on the locking tabs before disconnecting the cable. As you pull connectors apart, keep them evenly aligned to avoid bending any connector pins. Also, before you connect a cable, make sure both connectors are correctly oriented and aligned.

•Handle components and cards with care. Don’t touch the components or contacts on a card. Hold a card by its edges or by its metal mounting bracket. Hold a component such as a microprocessor chip by its edges, not by its pins.

Protecting Against Electrostatic Discharge

Static electricity can harm delicate components inside the computer. To prevent static damage, discharge static elec- tricity from your body before you touch any of the computer’s electronic components, such as the micro- processor. You can do so by touching an unpainted metal surface on the computer chassis.

As you continue to work inside the computer, periodi- cally touch an unpainted metal surface to remove any static charge your body may have accumulated.

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