Furuno FSV-84 manual Troubleshooting, 11-4, Symptom Check, Remedy

11. MAINTENANCE, TROUBLESHOOTING

11.4Troubleshooting

The table below provides common symptoms of equipment troubles and the means to rectify them.

		Troubleshooting
Symptom		Check, Remedy
Cannot turn on	•	Check cables between transceiver unit, processor unit and
the power.		monitor unit.
	•	Check ship’s mains.
	•	Have a suitably qualified technician check the fuse in the
		transceiver unit.
Bottom echo	•	Rough seas. Distance to the bottom changes due to rolling
becomes		and pitching.
irregular.	•	Long range selected. Transmission period is longer so ship’s
		pitching and rolling are apt to affect detection of echo.
Weak echo	•	Output power set to minimum. Set to maximum, on the
		H-SCAN SETTING menu.
	•	Excessive TVG. Readjust TVG on the appropriate menu
		(H-SCAN SETTING, V-SCAN SETTING). Note that
		readjustment of TVG is necessary when gain is adjusted.
Somewhat	•	Brilliance setting too low. Increase brightness with the
strange color		[BRILLIANCE] control.
Picture contains	•	Equipment not grounded properly. Check equipment ground.
noise.	•	Power cable is too close to the signal cable. Relocate power
		cable or signal cable.
	•	Debris may be on sea surface. Reject unwanted noise with
		the interference rejector on the appropriate menu among
		H-SCAN SETTING, V-SCAN SETTING.

11-4