JRC JMA-2343, Instruction Manual

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217
No. Condition of the Breakdown Conceivable Cause
5 Only noise is displayed and
no radar image is displayed
(characters and markers
are, however, displayed). a. Modulator (JMA-2343: CME-307, JMA2344: CME-308)
b. Defective
magnetron
c. Breakdown in the main control circuit (CMC-1156)
d. Defective tuning voltage
6 While radar images are
displayed, the characters
and markers are not
displayed. a. Breakdown in the main control circuit (CMC-1156).
7 Reception is poor. a. Deterioration or fault in the magnetron
b. Breakdown in the modulator (JMA-2343: CME-307,
JMA-2344: CME-308). Defect in the pulse width
switching?
c. Breakdown in the receiver (JMA-2343: CAE-457,
JMA-2344: CAE-457-1)
d. Water damage to the radiation unit or cables between
equipment (soiling of the radiation unit, adherence of
ice or snow, internal erosion of the cable between
equipment)
e. Defective tuning voltage
f. Interruption in the pulse switching signal (PW)
8 The image is warped or
drifts.
a. Breakdown or defective adjustment of the monitor
b. Interruption in the synchronizing signal for horizontal
signal (HS) and vertical signal (VS)
c. Breakdown in the CRT monitor circuit (CNN-366)
9 Nothing happens on the
screen when the fixed
distance marker, variable
distance marker, electronic
cursor or panel lighting
switches are pushed. a. The brightness adjustment is at the minimum level.
b. Breakdown in the main control circuit (CMC-1156)
10 The screen returns to the
initial state during operation.
a. The electric power of the ship is inadequate.
b. Breakdown in the main control circuit (CMC-1156)
c. Breakdown in the power supply unit
11 The alarm does not activate. a. Breakdown in the main control circuit (CMC-1156)
12 The radar wake does not
operate.
a. Breakdown in the main control circuit
b. The image brightness is too low.
13 The display does not
change to true bearing
(north-up) or course up.
a. There is no data being received from the bearing
sensor (NMEA).