Advanced-Level Troubleshooting - Furuno FCR-2107 Series Operator's Manual

22.4

Advanced-Level Troubleshooting

This section describes how to cure hardware and software troubles which should be carried out by qualified service
personnel.
Note: This radar equipment contains complex modules in which fault diagnosis and repair down to component level
are not practicable by users.
Problem
Power turned on but radar does
not operate at all
Brilliance adjusted but no
picture
Antenna not rotating
Data and marks not displayed
in Transmit status
Adjust GAIN with A/C SEA
set at minimum. Marks and
indications appear but no noise
or echo
Marks, indications and noise
appear but no echo
(Transmission leak
representing own ship position
is absent)
Picture not updated or picture
freeze-up
Incorrect orientation of picture
Cannot operate radar from on-
screen boxes
Advanced troubleshooting
Probable causes or
check points
1) Blown fuse.
2) Mains voltage/polarity
3) Power supply board
SPU board
1) Antenna drive mechanism
2) Defective antenna drive
motor relay (thermal relay K2,
200/220/380, 440/100 VAC)
SPU board
1) IF amplifier
2) Signal cable between
antenna and processor
unit
3) Video amplifier board
1) TX high voltage
protection circuit has activated.
2) Magnetron
3) Modulator board
4) SPU board
1) Bearing signal generator
board (in antenna unit)
2) SPU board
3) Video freeze-up
1) SPU board
2) Gyro interface
SPU Board
22. Maintenance and Troubleshooting
Remedy
1) Replace blown fuse.
2) Correct wiring and input voltage.
3) Replace power supply board.
Replace SPU board.
1) Replace antenna drive mechanism.
2) Press relay reset button.
Replace SPU board.
1) Replace IF amplifier.
2) Check continuity and isolation of coaxial
cable.
Note: Disconnect the plug and lugs at both
ends of coaxial cable before checking it by
ohmmeter.
3) Check video coax line for secure
connection. If connection is good, replace
SPU board.
1) Reset power to restore normal operation.
2) Check magnetron current.
Replace magnetron.
3) Replace modulator board.
4) Replace SPU board.
1) Check the connection of signal cables.
2) Replace SPU board.
3) Turn off and on the radar.
1) The message GYRO appears when the
heading pulse is not received during standby.
2) Replace the gyro interface.
Replace SPU Board.
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