Chapter 2. Re lated serv ice inform ation 43
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 elec trical 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 wo rk ar ea. Ex amples of t hese
hazards are moist floors, nongrounded power extension cables, power surges,
and missing safet y gro u n d s.
• Do not touch live electrical circuits with the reflective surface of a plastic dental
mirror. The surface is conductiv e ; su ch touching can cause per so nal 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 practi ce ensures correct groundi ng of the units.)
• If an electrical accident occurs:
— Use caution; d o not become a victim yourself.
—Switch off power.
— Sen d another perso n to get medi cal aid.
Safety inspection guide
The intent of this inspection guide is to assist you in identifying pot entially unsafe
conditions on these products. Each machine, as it was designed and built, had
required safety items installed to protect users and s ervice personnel fr om injur y. This
guide addresses only those item s. However, good judgment sho uld be used to
identify potential safety h aza rds due to att achmen t of non -IB M featu r es o r o ption s no t
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 correct in g 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, suc h as a damaged CRT face or bulging capacitor
• Mechanical hazards, such as loose or missing hardware
The guide consists of a series of steps presented in a checklist. Begin the checks with
the power off, a nd the power cord disconnected.
Checklist: