JRC JMR-9230-S Installation Manual page 20

Optimal values have been set for VD LEVEL and CONSTANT; therefore,
never change their values unless absolutely necessary. Failure may result in
accidents that would lower target tracking performance.
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 may result in electric shock.
Make sure to take off your watch when your hand must get close to the
magnetron.
Failure may result in damage to the watch since the magnetron is a strong
magnet.
Make sure that two or more staff member work together when replacing the
LCD. If only one person attempts to replace the LCD, he/she may drop it and
become injured.
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 may result in electric shock.
Any adjustments must be made by specialized service personnel.
Incorrect settings may result in unstable operation, and this may lead to
accidents or equipment failure.
Do not make any adjustments during navigation.
Failure may result in adverse effects on the radar function which may lead to
accidents or equipment failure.
Do not change the quantization level settings unless absolutely necessary.
If set at an inappropriate value, the target acquisition or target tracking
function deteriorates, and this may lead to accidents.
Do not use or leave the equipment under direct sunlight for a long time or in
the temperatures above 55°C.
Otherwise, a fire or a malfunction may occur.
Do not block the ventilation opening of the equipment.
Otherwise, heat may accumulate inside to cause a fire or a malfunction.
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