Advanced-Level Troubleshooting - Furuno FR-8062 Operator's 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.
This radar equipment contains complex modules in which fault diagnosis and repair
Note
down to component level are not practical by users.
Problem
Power cannot be
turned on
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 (Transmis-
sion leak repre-
senting own ship
position is absent)
Picture not updated
or picture freeze-up
Radar is properly
tuned but sensitivity is
poor
Range changed but
radar picture does not
change
6-6
Advanced-level troubleshooting
Probable cause or
check points
1) Blown fuse.
2) Mains voltage/polarity
3) Power supply board
1) SPU Board
1) Antenna drive mechanism
1) SPU board
1) Signal cable between
antenna and display unit
2) IF amplifier
3) Video amplifier board
1) Magnetron
2) Modulator board
3) SPU board
1) Bearing signal generator
2) SPU board
3) Video freeze-up
1) 2nd trace echo rejector is
ON.
2) Dirt on radiator face
3) Deteriorated magnetron
4) Detuned MIC
1) Defective range key
2) SPU board
3) Video freeze-up
Remedy
1) Replace blown fuse.
2) Correct wiring and input voltage.
3) Replace power supply board.
1) Replace SPU board.
1) Replace antenna drive mechanism.
1) Replace SPU board.
1) Check continuity and isolation of coaxial
cable.
2) Replace IF amplifier.
3) Check coax line for secure connection. If
connection is good, replace SPU board.
1) Check magnetron current.
2) Replace modulator board.
3) Replace SPU board.
1) Check that signal cables are fastened
securely.
2) Replace SPU board.
3) Turn the radar off and on.
1) Turn off the 2nd-trace echo rejector, from
the Echo menu.
2) Clean radiator.
3) With the radar transmitting on 48 nm
range, check magnetron current. If cur-
rent is below normal, magnetron may be
defective. Replace the magnetron.
4) Check MIC detecting current. If it is below
normal value, MIC may have become
detuned.
1) Try to operate the RANGE key. If unsuc-
cessful, replacement of the keypad may
be necessary.
2) Replace SPU board.
3) Turn radar off and on.