IBM 866251Y - Netfinity 5500 M20, Hardware Maintenance Manual

Page: 375 / 386

– 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 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.
Ÿ
Regularly inspect and maintain your electrical hand
tools for safe operational condition.
Ÿ
Do not use worn or broken tools and testers.
Ÿ
Never assume that power has been disconnected
from a circuit. First,
check that it has been
powered-off.
Ÿ
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.
Ÿ
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.
Ÿ
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.)
Ÿ
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
identifying potentially unsafe conditions on these products.
Each machine, as it was designed and built, had required
safety items installed to protect users and service
personnel from injury. This guide addresses only those
items. However, good judgment should be used to identify
Related service information
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