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7. Check for worn, frayed, or pinched cables.
8. Make sure that the power-supply cover fasteners (screws or rivets) have not been removed or tampered
with.
Guidelines for servicing electrical equipment
Observe the following guidelines when servicing electrical equipment:
• Check the area for electrical hazards such as moist floors, nongrounded power extension cords, power
surges, and missing safety grounds.
• Use only approved tools and test equipment. Some hand tools have handles that are covered with a soft
material that does not provide insulation from live electrical currents.
• Regularly inspect and maintain your electrical hand tools for safe operational condition. Do not use
worn or broken tools or testers.
• Do not touch the reflective surface of a dental mirror to a live electrical circuit. The surface is conductive
and can cause personal injury or equipment damage if it touches a live electrical circuit.
• Some rubber floor mats contain small conductive fibers to decrease electrostatic 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 voltages.
• Locate the emergency power-off (EPO) switch, disconnecting switch, or electrical outlet 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 supplies, or remove
or install main units.
• Before you work on the equipment, disconnect the power cord. If you cannot disconnect 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 that it has been
disconnected.
• If you have to work on equipment that has exposed electrical circuits, observe the 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 are working 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 floor strips and equipment
frames.
• Use extreme care when you measure high voltages.
• To ensure proper grounding of components such as power supplies, pumps, blowers, fans, and motor
generators, do not service these components outside of their normal operating locations.
• If an electrical accident occurs, use caution, turn off the power, and send another person to get medical
aid.
Handling static-sensitive devices
Attention: Static electricity can damage the server and other electronic devices. To avoid damage, keep
static-sensitive devices in their static-protective packages until you are ready to install them.
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ThinkServerHardware Maintenance Manual
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