Lenovo ThinkPad 600E Hardware Maintance Manual - June 1999: ThinkPad 600, 600E - Page 18

Introduction, exposed, Never assume, check, with the power on, floors

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Introduction 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 your pocket or behind your back. Attention: 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 testers, 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 floor strips and machine frames. Observe the special safety precautions when you work with very high voltages; these instructions are in the safety sections of maintenance information. Use extreme care when measuring high 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 is conductive; 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 operating places in a machine: - 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. - Switch off power. - Send another person to get medical aid. 12

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Introduction
±
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 your pocket or behind your back.
Attention:
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 testers, 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 floor strips and machine frames.
Observe the special safety precautions when you
work with very high voltages; these instructions are in
the safety sections of maintenance information. Use
extreme care when measuring high 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 is
conductive; 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 operating
places in a machine:
–
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.
–
Switch off power.
–
Send another person to get medical aid.
12