Furuno FS-5070 manual Simple Troubleshooting, 11-3

11.MAINTENANCE & TROUBLESHOOTING

11.3Simple Troubleshooting

The table below provides possible problems and the means with which to restore normal operation. If normal operation cannot be restored, do not attempt to check inside the equipment. Any servicing should be referred to a qualified technician.

Problem	Probable cause		Remedy
Power cannot be	•	Mains switchboard may be off.	•	Turn on the mains switchboard.
turned on.	•	(DC) voltage is too high.	•	Check supply voltage.

•Battery may have discharged, • Recharge battery and tighten battery

		or poor contact at terminals.		terminals.
Display	•	Contrast is too low.	•	Operate the 9/	key to adjust
indications do not				contrast.
appear but key
lamps are lit.
Power is on but	•	Loudspeaker is off.	•	Operate the 7/	key to turn on the
no sound from				loudspeaker.
loudspeaker.
Poor articulation	•	Wrong class of emission may	•	Class of emission should match that of
		be in use.		incoming signal.
Output power	•	Power is automatically reduced	•	Wait until the unit returns to normal
reduced to LOW		to protect against overheating		condition.
		due to continuous transmission.
Antenna coupler	•	Antenna may be disconnected	•	Check antenna connection.
cannot tune		or shorted to ground.	•	Recommended length is 10 to 18
antenna	•	Antenna is out of tunable		meters.
	•	length.	•	Check coupler ground.
		Poor grounding of antenna	• Checks mains voltage and polarity.
	•	coupler.		If normal, reset breaker.
		Breaker in coupler has tripped.	•	Check cable.
	•	Connection cable loosened or
		disconnected.
The message	•	Input has been switched from	•	Press the CANCEL key. The output
“Ship’s mains		AC to DC when AC FAIL line of		power can be increased on the RT
failure” appears,		AC/DC power supply unit		display. Note that the output power
and Output power		PR-850A is connected to		remains “HIGH” when it occurs while
indicator blinks.		FS-5070.		sending the distress call. When AC
Transmission				power is restored, this problem is
power is				automatically resolved.
decreased to
LOW2.
(FS-5070 only)
After turning on	•	After turning on the NBDP	•	Turn on the control unit before turning
the power, the		terminal unit, you have turned		on the NBDP terminal unit.
initial screen		on the control unit.
appears
continuously.
(The RT screen
should appear
after the initial
screen is erased.)

11-3