Advanced-Level Troubleshooting - Furuno FAR-2807(-D) series Operator's Manual

6.7

Advanced-level Troubleshooting

This section describes how to cure hardware and software troubles that should
be carried out by qualified service personnel.
Note 1: This radar equipment contains complex modules in which fault
diagnosis and repair down to component level are not practicable by
users.
Note 2: When replacement of the SPU board is necessary, the previous settings
can be transferred to new SPU board as follows:
- Use the CU-200 to save settings to a RAM card.
- After replacing the SPU board, load the entire contents of the RAM
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)
card to the radar, referring to section 5.12 for the procedure.
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
6. MAINTENANCE, 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.
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