Advanced Troubleshooting - Furuno FR-1908V-BB Operator's Manual

5. MAINTENANCE, TROUBLESHOOTING
5.6

Advanced Troubleshooting

This section describes how to cure hardware and software troubles that should be car-
ried out by qualified service personnel.
Problem
You cannot turn on the
power.
Power turned on but radar
does not operate at all.
Antenna not rotating
Set [GAIN] to maximum
with [STC] and [RAIN]
settings at minimum. Marks
and indications appear but
no noise or echo.
Marks, indications and
noise appear but no echo in
short range.
Picture not updated or
picture freeze-up.
GAIN is poor.
Radar is correctly tuned but
sensitivity is poor.
5-6
Advanced troubleshooting
Probable causes or
check points
• Blown fuse.
• Mains voltage/polarity
• Power supply board
Panel board
• Antenna switch setting (See
the Installation manual.)
• Check for the voltage for
motor.
• Antenna switch of antenna
unit
• Gear mechanism
• RF_TB board
• IF amplifier
• Signal cable between
antenna and processor unit
• VIDEO_AMP board
• SPU cable connection on the
VIDEO_AMP board
• Magnetron
• Modulator board
• SPU board
• Bearing signal generator
• SPU board
Tuning
• Deteriorated magnetron
• Dirt on radiator face
Remedy
• Replace blown fuse.
• Correct wiring and input voltage.
• Replace power supply board.
Replace panel board.
• Check the setting of antenna
switch.
• Replace PSU board.
• Check if antenna switch is ON.
• Replace the motor.
• Replace RF_TB board.
• Replace IF amplifier.
• Check continuity and isolation of
coaxial cable.
• Replace video amplifier.
• Check magnetron current.
• Replace modulator board.
• Replace SPU board.
• Check that signal cables are
fastened.
• Replace SPU board.
• Turn off and on the radar.
Do the [TUNE INITIALIZE] setting.
See paragraph 1.8.4.
• Check the magnetron current
with the radar transmitting
on 48 nm range.
• Clean radiator.