JRC JMA-5212-4, Service Manual

Page: 135 / 172

6-19
6.2.3. Error Messages for the External Input-Output Equipment
NSK(Time Out)
Description
This message indicates that the communication signals of the NSK unit connected to the display
system and the radar processing circuit are faulty.
If the message is displayed, the true bearing value cannot be displayed.
The NSK unit, the power terminal board circuit in the display system, or the radar processing
circuit may be faulty.
Location of cause
o
Procedure
NSK unit
NCT-4106A
(CMJ-304E)
x
Check the insertion of the 8-pin connector on the NSK unit
NCT-4106A.
x
Check the lighting of LEDs on the NSK unit NCT-4106A.
x
Replace the NSK unit NCT-4106A.
Power terminal board
circuit CBD-1702A in
the display system
x
Check the CBD-1702A cable connection. J5, J5002, J5003
x
Replace the CBD-1702A.
CDC-1350 in the
display system
x
Check the insertion of J4402 and J4003 on the radar processing
circuit CDC-1350.
x
Replace the CDC-1350.
GYRO(Data)
Description
This message indicates that the NSK unit connected to the display system cannot recognize the
GYRO signal.
If the message is displayed, the true bearing value cannot be displayed.
A fuse in the NSK unit may be blown or the NSK unit may be faulty.
There may be no GYRO output or GYRO signal amplification may be too low.
Location of cause
o
Procedure
NSK unit
NCT-4106A
(CMJ-304E)
x
Check the insertion of the 8-pin connector on the NSK unit NCT-4106A.
x
Check the connections of cables of the NSK unit NCT-4106A.
TB10
x
Check the settings of switches on the NSK unit NCT-4106A.
x
Check the fuses F1 to F4 on the NSK unit NCT-4106A.
x
Replace the NSK unit NCT-4106A.