Furuno FR-8251, FR-8111 manual Advanced-level Troubleshooting, Serviceman qualification

4.2Advanced-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.

Serviceman qualification

All adjustments of radio transmitter during or coinciding with the installation, servicing, or maintenance which may affect the proper opera- tion must be performed by or under the immedi- ate supervision and responsibility of a person holding an operator certificate containing a ship radar endorsement.

This is what the U.S. Codes of Federal Regula- tions part 80.169 implies (not exact extract).

As such, every administration sets forth its own rule; service personnel must be aware of this kind of competency requirements.

Problem	Check point and probable		Remedy
	cause
Power turned on but radar	1.	Blown fuse F1351	1.	Replace blown fuse.
does not operate at all.	2.	Mains voltage/polarity	2.	Correct wirings and input voltage.
Control panel is not	3.	Power Supply Board	3.	Replace Power Supply Board.
illuminated either.	4.	Illumination LEDs	4.	Replace defective LEDs.
CRT brilliance adjusted but	1.	INSTALL 3 menu setting	1.	Select "MAIN" for main radar.
no picture	2.	CRT voltage		(For further details consult a
	3.	SPU Board		FURUNO agent or dealer.)
			2.	Check high voltage supply with
				utmost care.
			3.	Replace SPU Board.
Antenna not rotating	1.	Power supply line of antenna	1.	Check connection and continuity
		motor		of signal cable.
Alphanumeric data and	1. SPU Board		1.	Replace SPU Board.
marks are not displayed in
Transmit status.

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