JRC JMA-610 Series Instruction Manual page 10

Do not put watches, clocks, or magnetic cards close to
the modulator unit since this unit holds magnetrons
having strong magnetic force. Failure or data
destruction of the above devices may result.
Turn off the main power source before replacing parts.
Otherwise, an electric shock or trouble may be caused.
Before replacing the magnetron, turn off the main
power source and wait for 5 minutes or more until the
high voltage circuits are discharged.
Otherwise, an electric shock may be caused.
Take off your wrist watch when bringing your hands
close to the magnetron.
Otherwise, your watch may be damaged because the
magnetron is a strong magnet.
Two or more persons shall replace the liquid crystal
monitor.
If only one person does this work, he may drop the
LCD, resulting in injury.
Even after the main power source is turned off, some
high voltages remain for a while.
Do not contact the inverter circuit in the LCD with bare
hands. Otherwise, an electric shock may be caused.
CAUTION
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