Advanced-Level Troubleshooting - Furuno FA Manual

6. MAINTENANCE, TROUBLESHOOTING
6.7

Advanced-level Troubleshooting

This paragraph 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
(Continued on next page)
6-6
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
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 continuously 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.