JRC JMR-611 Instruction Manual page 10

Safety Cautions
Cautions for High Voltage
High voltages, ranging from several hundreds to tens of thousands volts, are used in
electronic apparatus, such as radio and radar instruments. These voltages are totally
harmless in most operations. However, touching a component inside the unit is very
dangerous. (Any person other than authorized service engineers should not maintain,
inspect, or adjust the unit.)
High voltages on the order of tens of thousands volts are most likely to cause instant
deaths from electrical shocks. At times, even voltages on the order of several hundred
volts could lead to electrocution. To defend against electrical shock hazards, don't put
your hand into the inside of apparatus. When you put in a hand unavoidably in case of
urgent, it is strongly suggested to turn off the power switch and allow the capacitors,
etc. to discharge with a wire having its one end positively grounded to remove residual
charges. Before you put your hand into the inside of apparatus, make sure that internal
parts are no longer charged. Extra protection is ensured by wearing dry cotton gloves
at this time. Another important precaution to observe is to keep one hand in your pocket
at a time, instead of using both hands at the same time.
It is also important to select a secure footing to work on, as the secondary effects of
electrical shock hazards can be more serious. In the event of electrical shocks, disinfect
the burnt site completely and obtain medical care immediately.
Precautions for Rescue of Victim
of Electric Shock
When a victim of electric shock is found, turn off the power source and ground the
circuit immediately. If this is impossible, move the victim away from the unit as quick as
possible without touching him or her with bare hands. He or she can safely be moved if
an insulating material such as dry wood plate or cloth is used.
Breathing may stop if current flows through the respiration center of brain due to
electric shock. If the electric shock is not large, breathing can be restored by artificial
respiration. A victim of electric shock looks pale and his or her pulse may become very
weak or stop, resulting in unconsciousness and rigidity at worst. It is necessary to
perform first aid immediately.
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