Replacement Of Major Parts - JRC JMA-2353 Instruction Manual

Chapter 4 MAINTENANCE

4.4 REPLACEMENT OF MAJOR PARTS

4.4 REPLACEMENT OF MAJOR PARTS
The system includes parts that need periodic replacement. The parts should be replaced
as scheduled. Use of parts over their service life can cause a system failure.
When it is necessary to get close to the antenna for maintenance
or inspection purposes, make sure to turn the indicator power
switch to "OFF" or "STBY."
Direct exposure to electromagnetic waves at close range will have
adverse effects on the human body.
When conducting maintenance work, make sure to turn off the
power and unplug the power connector J1 of the display unit so
that the power supply to the equipment is completely cut off.
Some equipment components can carry electrical current even
after the power switch is turned off, and conducting maintenance
work without unplugging the power connector may result in
electrocution, equipment failure, or accidents.
Make sure to shut off the main power before replacing parts.
Failure to comply may result in electrocution or equipment failure.
When replacing magnetrons, make sure to shut off the main power
and let the equipment stand for more than 5 minutes to discharge
the high-voltage circuit.
Failure to comply may result in electrocution.
Make sure to take off your watch when your hand must get close
to the magnetron.
Failure to comply may result in damage to the watch since the
magnetron is a strong magnet.
Do not directly touch the inverter circuit of the LCD display with a
bare hand since high voltage temporarily remains in the circuit
even after the main power is shut off.
Failure to comply may result in electrocution.
 Parts Required for Periodic Replacement
Here are parts required for periodic replacement.
1. Magnetron
2. Motor
4-16
WARNING
CAUTION
Part name Interval
4,000 hours
10,000 hours