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Safety Addendum 127
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.
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 potential safety hazards due to attachment of non-IBM
features or options not covered by this inspection guide.
If any unsafe conditions are present, you must determine how serious the apparent hazard could be
and whether you can continue without first correcting the problem.
Consider these conditions and the safety hazards they present:
• Electrical hazards, especially primary power (primary voltage on the frame can cause serious or
fatal electrical shock).
• Explosive hazards, such as a damaged CRT face or bulging capacitor
• Mechanical hazards, such as loose or missing hardware