Guidelines For Servicing Electrical Equipment - Lenovo 5594-5KX Replacing

Safety

Guidelines for servicing electrical equipment

Observe these guidelines when you service electrical equipment.
Check the area for electrical hazards such as moist foors, non-grounded power
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extension cords, and missing safety grounds.
Use only approved tools and test equipment. Some hand tools have handles that are
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covered with a soft material that does not provide insulation from live electrical current.
Regularly inspect and maintain your electrical hand tools for safe operational condition.
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Do not use worn or broken tools or testers.
Do not touch the refective surface of a dental mirror to a live electrical circuit. The
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surface is conductive and can cause personal injury or equipment damage if it touches a
live electrical circuit.
Some rubber foor mats contain small conductive fbres to decrease electrostatic
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discharge. Do not use this type of mat to protect yourself from electrical shock.
Do not work alone under hazardous conditions or near equipment that has hazardous
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voltages.
Locate the emergency power-off (EPO) switch, disconnecting switch, or electrical outlet
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so that you can turn off the power quickly in the event of an electrical accident.
Disconnect all power before you perform a mechanical inspection, work near power
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supplies, or remove or install main units.
Before you work on the equipment, disconnect the power cord. If you cannot disconnect
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the power cord, have the customer power-off the wall box that supplies power to the
equipment and lock the wall box in the off position.
Never assume that power has been disconnected from a circuit. Check it to make sure
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that it has been disconnected.
If you have to work on equipment that has exposed electrical circuits, observe the
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following precautions:
─ Make sure that another person who is familiar with the power-off controls is near
you and is available to turn off the power if necessary.
─ When you work with powered-on electrical equipment, use only one hand. Keep
the other hand in your pocket or behind your back to avoid creating a complete
circuit that could cause an electrical shock.
─ When you use a tester, set the controls correctly and use the approved probe
leads and accessories for that tester.
─ Stand on a suitable rubber mat to insulate you from grounds such as metal foor
strips and equipment frames.
Use extreme care when you measure high voltages.
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To ensure proper grounding of components such as power supplies, pumps, blowers,
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fans, and motor generators, do not service these components outside of their normal
operating locations.
xii Replacing the UPS Front Bezel including LCD