Lenovo 6532 - Manual (Page 124)

• 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.
Working inside the server with the power on
Attention: Static electricity that is released to internal server components when the server is powered-on
might cause the server to halt, which might result in the loss of data. To avoid this potential problem,
always use an electrostatic-discharge wrist strap or other grounding system when you work inside the
server with the power on.
You might be instructed to turn on the server while the cover is off, to look at system-board LEDs. Follow
these guidelines when you work inside a server that is turned on:
• Avoid wearing loose-fitting clothing on your forearms. Button long-sleeved shirts before working inside
the server; do not wear cuff links while you are working inside the server.
• Do not allow your necktie or scarf to hang inside the server.
116 Hardware Maintenance Manual