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    Safety Precautions

    Summary: This article provides information about basic safety precautions that users must take before you access the internals of a computer or electrical equipment. Find information about how to protect against electrostatic discharge (ESD), prevent electrostatic damage to the components, and safety precautions when lifting electronic equipment.


    Protection Against Electrostatic Discharge (ESD)

    Original products that have the CE marking are designed and tested for immunity to international Electrostatic Discharge (ESD) standards. While these products have been designed and determined to be compliant with standard levels for ESD, there may be situations, such as low humidity levels, that can exacerbate ESD event occurrence.

    Electrostatic discharge (ESD) events can harm electronic components inside your computer. Under certain conditions, ESD may build up on your body or an object, such as a peripheral, and then discharge into another object, such as your computer. To prevent ESD damage, you should discharge static electricity from your body before you interact with any of your computer’s internal electronic components, such as a memory module.

    You can protect against ESD and discharge static electricity from your body by touching a metal grounded object (such as an unpainted metal surface on your computer’s I/O panel) before you interact with anything electronic. When connecting a peripheral (including handheld digital assistants) to your computer, you should always ground both yourself and the peripheral before connecting it to the computer. In addition, as you work inside the computer, periodically touch a metal-grounded object to remove any static charge your body may have accumulated.

    You can also take the following steps to prevent damage from electrostatic discharge:

    • When unpacking a static-sensitive component from its shipping carton, do not remove the component from the antistatic packing material until you are ready to install the component. Just before unwrapping the antistatic package, be sure to discharge static electricity from your body.
    • When transporting a sensitive component, first place it in an antistatic container or packaging.
    • Handle all electrostatic sensitive components in a static-safe area. If possible, use antistatic floor pads and work bench pads.

    General safety guidelines

    Use the following safety guidelines to protect your computer from potential damage and to ensure your personal safety. Unless otherwise noted, each procedure included in this document assumes that you have read the safety information that shipped with your computer.

    1. Place the equipment on a hard, level surface. Leave a 10.2 cm (4 in) minimum of clearance on all vented sides of the computer to permit the airflow required for proper ventilation. Restricting airflow can damage the computer or cause a fire.
    2. Do not stack equipment or place equipment so close together that it is subject to re-circulated or preheated air.
    3. Ensure that nothing rests on your equipment’s cables and that the cables are not located where they can be stepped on or tripped over.
    4. Ensure that all cables are connected to the appropriate connectors. Some connectors have a similar appearance and may be easily confused (for example, do not plug a telephone cable into the network connector).
    5. Do not place your device in a closed-in wall unit, or on a soft, fabric surface such as a bed, sofa, carpet, or a rug.
    6. Keep your device away from radiators and heat sources.
    7. Keep your equipment away from extremely hot or cold temperatures to ensure that it is used within the specified operating range.
    8. Do not push any objects into the air vents or openings of your equipment. Doing so can cause fire or electric shock by shorting out interior components.
    9. Do not use your equipment in a wet environment, for example, near a bath tub, sink, or swimming pool or in a wet basement.
    10. Do not use AC powered equipment during an electrical storm. Battery powered devices may be used if all cables have been disconnected.
    11. Do not spill food or liquids on your equipment.
    12. Before you clean your equipment, disconnect it from the electrical outlet. Clean your device with a soft cloth dampened with water. Do not use liquids or aerosol cleaners, which may contain flammable substances.
    13. Clean the laptop LCD screen or monitor display with a soft, clean cloth and water. Apply the water to the cloth, then stroke the cloth across the display in one direction, moving from the top of the display to the bottom. Remove moisture from the display quickly and keep the display dry. Long-term exposure to moisture can damage the display. Do not use a commercial window cleaner to clean your display.

    Before working inside your computer

    1. To help avoid the potential hazard of electric shock, do not connect or disconnect any cables or perform maintenance or reconfiguration of your equipment during an electrical storm.
    2. Save and close all open files and exit all open applications.
    3. Shut down your computer. Click Start > Power > Shut down.
    4. Disconnect your computer and all attached devices from their electrical outlets.
    5. Disconnect all attached network devices and peripherals, such as keyboard, mouse, and monitor from your computer.
    6. Remove any media card and optical disc from your computer, if applicable.

    After working inside your computer

    1. Replace all screws and ensure that no stray screws remain inside your computer.
    2. Connect any external devices, peripherals, or cables you removed before working on your computer.
    3. Replace any media cards, discs, or any other parts that you removed before working on your computer.
    4. Connect your computer and all attached devices to their electrical outlets.
    5. Turn on your computer.

    General power safety guidelines

    • Check the voltage rating before you connect the equipment to an electrical outlet to ensure that the required voltage and frequency match the available power source.
    • Your device is equipped with either an internal power source or an external adapter. For internal power sources, your device is equipped with one of the following:
      • An auto-sensing voltage circuit – Devices with an auto-sensing voltage circuit do not have a voltage selection switch on the back panel and automatically detect the correct operating voltage.
      • Or, a manual voltage selection switch – Devices 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.
      • Ensure that the computer, monitor, and attached devices are electrically rated to operate with the AC power available in your location.
      • Do not plug the equipment power cables into an electrical outlet if the power cable is damaged.
      • To prevent electric shock, plug the equipment power cables into properly grounded electrical outlets. If the equipment is provided with a 3-prong power cable, do not use adapter plugs that bypass the grounding feature, or remove the grounding feature from the plug or adapter.
      • If you use an extension power cable, ensure that the total ampere rating of the products plugged in to the extension power cable does not exceed the ampere rating of the extension cable.
      • If you must use an extension cable or power strip, ensure the extension cable or power strip is connected to a wall power outlet and not to another extension cable or power strip. The extension cable or power strip must be designed for grounded plugs and plugged into a grounded wall outlet.
      • If you are using a multiple-outlet power strip, use caution when plugging the power cable into the power strip. Some power strips may allow you to insert a plug incorrectly. Incorrect insertion of the power plug could result in permanent damage to your equipment, as well as risk of electric shock and/or fire. Ensure that the ground prong of the power plug is inserted into the mating ground contact of the power strip.
      • Be sure to grasp the plug, not the cable, when disconnecting equipment from an electric socket.
      • Use only the Original provided AC adapter approved for use with this device. Use of another AC adapter may cause a fire or explosion.
      • Place the AC adapter in a ventilated area, such as a desk top or on the floor, when you use it to run the computer or to charge the battery. Do not cover the AC adapter with papers or other items that will reduce cooling; also, do not use the AC adapter inside a carrying case.
      • The AC adapter may become hot during normal operation of your computer. Use care when handling the adapter during or immediately after operation.
      • It is recommended that you lay the adapter on the floor or desk so that the green light is visible. This will alert you if the adapter should accidentally go off due to external effects. If for any reason the green light goes off, disconnect the AC cord from the wall for a period of ten seconds, and then reconnect the power cord.
      • Never use an AC adapter that shows signs of damage or excessive wear.