Furuno FR-8252, FR-8062 Advanced-level Troubleshooting, Advanced-level troubleshooting, Echo menu

6. MAINTENANCE & TROUBLESHOOTING

6.7Advanced-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.
			Advanced-level troubleshooting
Problem			Probable cause or		Remedy
			check points
Power cannot be		1)	Blown fuse.	1)	Replace blown fuse.
turned on		2)	Mains voltage/polarity	2)	Correct wiring and input voltage.
		3)	Power supply board	3)	Replace power supply board.
Brilliance adjusted		1)	SPU Board	1)	Replace SPU board.
but no picture
Antenna not rotating		1)	Antenna drive mechanism	1)	Replace antenna drive mechanism.
Data and marks not		1)	SPU board	1)	Replace SPU board.
displayed in Transmit
status
Adjust GAIN with A/C		1)	Signal cable between	1)	Check continuity and isolation of coaxial
SEA set at minimum.			antenna and display unit		cable.
Marks and indications		2)	IF amplifier	2)	Replace IF amplifier.
appear but no noise		3)	Video amplifier board	3)	Check coax line for secure connection. If
or echo					connection is good, replace SPU board.
Marks, indications		1)	Magnetron	1)	Check magnetron current.
and noise appear but		2)	Modulator board	2)	Replace modulator board.
no echo (Transmis-		3)	SPU board	3)	Replace SPU board.
sion leak repre-
senting own ship
position is absent)
Picture not updated		1)	Bearing signal generator	1)	Check that signal cables are fastened
or picture freeze-up					securely.
		2)	SPU board	2)	Replace SPU board.
		3)	Video freeze-up	3)	Turn the radar off and on.
Radar is properly		1)	2nd trace echo rejector is	1)	Turn off the 2nd-trace echo rejector, from
tuned but sensitivity is			ON.		the Echo menu.
poor		2)	Dirt on radiator face	2)	Clean radiator.
		3)	Deteriorated magnetron	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)	Detuned MIC	4)	Check MIC detecting current. If it is below
					normal value, MIC may have become
					detuned.
Range changed but		1)	Defective range key	1)	Try to operate the RANGE key. If unsuc-
radar picture does not					cessful, replacement of the keypad may
change					be necessary.
		2)	SPU board	2)	Replace SPU board.
		3)	Video freeze-up	3)	Turn radar off and on.

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