Furuno FR-8251, FR-8111 manual Periodic Maintenance Schedule

3.1Periodic Maintenance Schedule

Interval	Check point	Check measures	Remarks
Weekly	Display unit	Periodically clean the exterior of	CRT screen produces static charge
		display unit using dry soft clean. Use	which would attract dust. DO NOT
		of commercially available CRT cleaner	use strong solvent like paint thinner
		(spray) having antistatic effect is	or abrasive cleaners for cleaning.
		recommended.	Dust and dirt on CRT creates
			symptoms similar to poor sensitivity.
3 to 6	Exposed nuts	Check for corroded or loosened nuts	Sealing compound may be used-
months	and bolts on	and bolts, If necessary, clean and	Instead of paint. Apply a small
	antenna unit	repaint them thickly. Replace them if	amount of grease between nuts and
		heavily corroded.	bolts for easy removal in future.
	Antenna radiator	Check for dirt and cracks on radiator	Do not use plastic solvent (acetone)
		surface. Thick dirt should be wiped off	for cleaning. If you need to remove
		with soft cloth dampened with fresh	ice from antenna unit, use a wooden
		water. If a crack is found, apply a	hammer or plastic. Crack on the unit
		slight amount of sealing compound or	may cause water ingress, causing
		adhesive as a temporary remedy, then	serious damages to internal circuits.
		call for repair.
	Terminal strips	Open antenna cover to check terminal	When closing antenna covers in
	and plugs in	strip and plug connections inside. Also	position, be careful not to catch loose
	antenna unit	check the rubber gasket of antenna	wires between covers and unit.
		covers for deterioration.
6 months	CRT and	High voltage at CRT and surrounding	If CRT anode rubber cap or wire
to one	surrounding	components attract dust in	sheath is cracked, ask your dealer to
year	components	environment which will cause poor	replace it. Wait for at least 3 minutes
		insulation. Ask your nearest FURUNO	until high voltage components (CRT
		representative or dealer to clean	and HV capacitors) discharge their
		internal high-voltage components.	residual charges before accessing
			them.
	Terminal strips,	Check for loose connections. Check
	sockets, earth	contacts and plugs for proper seating,
	terminal	etc.

3.2Life Expectancy of Major Parts

Parts	Type	Life expectancy
Antenna motor	D8G-516 (24 rpm)	Gear more than 10,000
	D8G-570 (36 rpm)	hours
Magnetron	MAF1422B (6kW)	2,000-3,000 hours
	MAF1425B (10kW)
	9M752/M5187F (25kW)

Remarks

Wind load 100 knots

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