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6
Cautionary Items for Service
•
Turn off all the powers before performing the following tasks.
1 Machine inspection
2 Work near the power supply
1
3 Main device removal or installation
•
Before working on the system, remove the power cord. If you cannot remove the power cord, ask the customer to turn
off the switch for the power supply box that supplies power to the system and lock it.
•
If you work in the system that exposes the electrical circuits, you must take the following preventive actions. Work next
to the person who is familiar with the electrical power system.
CAUTION
!
• If necessary, let other persons be located in the spot where they can easily turn off the power switch.
•
If you work on the equipment with power on, use one hand only. Put the other hand in the pocket or move it behind your
back.
CAUTION
!
• Electrical shocks only occur when the circuit composition is completed. If you obey the above rules, you can prevent
current conduction in your boy.
•
When using a tester, accurately set the control switch and use the tester reader and additional devices.
•
To protect yourself against metallic floor, or machine devices groundings, you must stand on a proper type of rubber mat.
•
For safe works, periodically inspect and repair electrical tools that you use with hands.
•
Take the special safety prevention measures when working with high voltage. The items are related to safety cautions for
repair and maintenance. Be extra careful when you measure a high voltage.
•
Do not use an old or malfunctioning device or tester.
•
Do not assume that the circuit is powered off. First check yourself that the power is off.
•
Carefully observe potential risk factors near the working areas. Wet floors, not grounded expansion power cables, sudden
voltage change (surge) or instable ground are the risk factors.
•
Do not touch the electrical circuit with something like a plastic dental mirror The surface of dental mirror is a conductor
so if you touch the circuitry with it, it can cause damages to the human body or the system.
•
If the following parts are out of their position in the system, do not start the service while the power is on.
1 Power supply
2 Pump
3 Ventilator or fan
4 Motor
5 Other similar devices (always check the grounds for these devices.)
•
If an electrical accident occurs,
1 Pay special attention to avoid becoming a victim yourself.
2 Turn off the power switch.
3 Ask others to request medical supports.
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