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Related service information 157
— 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 testers, set the controls correctly and
use the approved probe leads and accessories for
— 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.
that power has been disconnected from
a circuit. First,
that it has been powered-off.
• Always look carefully for possible hazards in your work
area. Examples of these hazards are moist floors, non-
grounded 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 con-
ductive; such touching can cause personal injury and
• 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
— 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.
Safety inspection guide
The intent of this inspection guide is to assist you in identify-
ing potentially unsafe conditions on these products. Each