Bedienungsanleitung Lenovo C445 (Seite 10 von 65) (Englisch)

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Observe the following rules when working on electrical equipment.

Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft

material that does not insulate you when working with live electrical currents. Many customers have rubber

oor mats near their equipment that contain small conductive bers to decrease electrostatic discharge.

• Find the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical

accident 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 Field Replaceable Units (FRUs)

• Before you start to work on the computer, unplug the power cord. If you cannot unplug it, ask the

customer to power-off the electrical outlet that supplies power to the machine and to lock the electrical

outlet in the off position.

• If you need to work on a computer that has exposed electrical circuits, observe the following precautions:

– Ensure that another person, familiar with the power-off controls, is near you.

Remember: 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 your

pocket or behind your back.

Remember: There must be a complete circuit to cause electrical shock. By observing the above rule,

you may prevent a current from passing through your body.

– When using a tester, set the controls correctly and use the approved probe leads and accessories for

that tester.

– Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as

metal oor strips and machine frames.

Observe the special safety precautions when you work with very high voltages; these instructions are in

the safety sections of the maintenance information. Use extreme care when measuring high voltages.

• Regularly inspect and maintain your electrical hand tools to ensure they are safe to use.

• 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 wet oors,

non-grounded power extension cables, conditions that may cause or allow power surges, and missing

safety grounds.

• Do not touch live electrical circuits with the reective surface of a plastic dental mirror. This surface is

conductive, and touching a live circuit can cause personal injury and damage to the computer.

• Do not service the following parts with the power on when they are removed from their normal operating

positions in a computer:

– Power supply units

– Pumps

– Blowers and fans

– Motor generators

and similar units. (This practice ensures correct grounding of the units.)

• If an electrical accident occurs:

– Use caution; do not become a victim yourself.

4 Lenovo C345/C445 All-In-One PCHardware Maintenance Manual

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