Troubleshooting - Furuno FSV-25 Operator's Manual

8.7

Troubleshooting

The table below provides common symptoms of equipment troubles and the means to
rectify them.
Symptom
Cannot turn on power.
Abnormal noise from hull unit
Bottom echo is unsteady.
Weak echoes
Color is abnormal.
Cannot operate the equipment
Picture contains noise.
Cannot turn off the power
The fish alarm does not sound.
The offcenter feature does not
work.
Troubleshooting
• Check cables between transceiver unit, processor unit and
monitor unit.
• Check the fuses.
• Check power source.
• Check if the breaker in the power supply unit has tripped.
Check if the drive shaft in the hull unit is sufficiently greased. See
section 8.2.
• Rough seas. Distance to the bottom changes due to rolling and
pitching.
• Long range selected. Transmission period is longer so ship's
pitching and rolling are apt to affect detection of echo.
• Output power set to minimum. Set [TX Power] to maximum, on
the [TX/RX Setting] menu.
• Adjust the GAIN control.
• Excessive TVG. Readjust [Near Gain], [Far Gain]. See
section 2.6.2.
Note: Readjustment of TVG is necessary after the gain is adjust-
ed.
Brilliance setting too low. Increase brightness of the monitor.
Application error. Long push the power switch on the control unit
approx. 10 seconds to turn off the power. Turn on the power and
check function.
• Equipment not grounded properly. Check equipment ground.
• Power cable is too close to the signal cable. Relocate power
cable or signal cable.
• Debris may be on the sea surface. Reject unwanted noise with
[Int Reject] in the [Picture Setting] menu or [Signal Level] in the
[Display Setting] menu.
Long push the power switch on the control unit approx. 10 sec-
onds to turn off the power.
The alarm does not sound when the setting of [Echo Disp Area]
(in the [Display Setting] menu) is changed. Re-set the alarm
range to get the audio for the fish alarm.
• When the true motion is used in the H2 mode, the range of the
H1 and H2 displays is different.
• Set the tilt angle to 0° when using the true motion.
8. MAINTENANCE, TROUBLESHOOTING
Check, remedy
8-7