Lenovo IdeaCentre K200 Hardware Maintenance Manual

Also see for IdeaCentre K Series: Hardware Maintenance Manual Hardware Maintenance Manual Hardware Maintenance Manual Hardware Maintenance Manual User guide

Contents

Hardware Maintenance Manual6If 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, isnear you.Remember: Another person must be there to switch off the power, ifnecessary.– Use only one hand when working with powered-on electricalequipment; keep the other hand in your pocket or behind your back.Remember: There must be a complete circuit to cause electricalshock. By observing the above rule, you may prevent a current frompassing through your body.– When using testers, set the controls correctly and use the approvedprobe leads and accessories for that tester.– Stand on suitable rubber mats (obtained locally, if necessary) toinsulate you from grounds such as metal floor strips and machineframes.Observe the special safety precautions when you work with veryhigh voltages; these instructions are in the safety sections ofmaintenance information. Use extreme care when measuring highvoltages.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 is conductive; such touching cancause personal injury and machine damage.Do not service the following parts with the power on when they are•removed from their normal operating places in a machine:– Power supply units– Pumps– Blowers and fans– Motor generatorsand similar units. (This practice ensures correct grounding of the units.)If an electrical accident occurs:•– Use caution; do not become a victim yourself.– Switch off power.– Send another person to get medical aid.