Lenovo ThinkPad W520 4284 Hardware Maintenance Manual

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Contents

Electrical safetyObserve the following rules when working on electrical equipment.Important: Use only approved tools and test equipment. Some hand tools have handles covered with a softmaterial that does not insulate you when working with live electrical currents.Many customers have, neartheir equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges.Do not use this type of mat to protect yourself from electrical shock.• Find the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electricalaccident occurs, you can then operate the switch or unplug the power cord quickly.• Do not work alone under hazardous conditions or near equipment that has hazardous voltages.• Disconnect all power before:– Performing a mechanical inspection– Working near power supplies– Removing or installing main units• Before you start to work on the machine, unplug the power cord. If you cannot unplug it, ask the customerto power-off the wall box that supplies power to the machine, and to lock the wall box in the off position.• If you need to work on a machine that has exposed electrical circuits, observe the following precautions:– Ensure that another person, familiar with the power-off controls, is near you.Attention: Another person must be there to switch off the power, if necessary.– Use only one hand when working with powered-on electrical equipment; keep the other hand in yourpocket or behind your back.Attention: An electrical shock can occur only when there is a complete circuit. By observing the aboverule, you may prevent a current from passing through your body.– When using testers, set the controls correctly and use the approved probe leads and accessories forthat tester.– Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such asmetal floor strips and machine frames.Observe the special safety precautions when you work with very high voltages; Instructions for theseprecautions are in the safety sections of maintenance information. Use extreme care when measuringhigh voltages.• Regularly inspect and maintain your electrical hand tools for safe operational condition.• Do not use worn or broken tools and testers.• Never assume that power has been disconnected from a circuit. First, check that it has been powered off.• Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors,nongrounded power extension cables, power surges, and missing safety grounds.• Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface isconductive; such touching can cause personal injury and machine damage.• Do not service the following parts with the power on when they are removed from their normal operatingplaces in a machine:– Power supply units– Pumps– Blowers and fans– Motor generators– Similar units to listed aboveThis practice ensures correct grounding of the units.• If an electrical accident occurs:– Use caution; do not become a victim yourself.– Switch off power.2 ThinkPad T520, T520i, and W520 Hardware Maintenance Manual