Troubleshooting; Dialog Box - Furuno FCV-30 Operator's Manual

4. MAINTENANCE & TROUBLESHOOTING
4.2

Troubleshooting

The section provides information which the user can follow to restore normal operation. If
normal operation cannot be restored, do not attempt to check inside any unit. Any repair
work is best left to a qualified technician.
Symptom
No echo sounder
image or depth
scale
No echo sounder
image but
characters and
markers appear.
Echo sounder
image appears but
no zero line.
Sensitivity is low.
No depth indication
Heavy noise and
interference
Position is wrong or
is not shown
(external input of
said data)
4-4
Troubleshooting
Cause
Battery may be dead.
Fuse may have blown. Check fuse in processor and transceiver units.
Power cable may
have become
disconnected.
Picture advance may
have been stopped.
Transducer cable may
have become
disconnected.
Display start position
may have been
shifted.
Gain setting is too low. Raise the gain.
Marine life is adhering
to transducer face.
Vessel is in heavily
sedimented water
Bottom is too soft to
return an echo.
Bottom is off the
screen.
Bottom search is
turned off.
Transducer located
too close to engine.
Earth connection has
loosened.
Same-frequency echo
sounder being
operated nearby.
Connector from
navigator may have
become disconnected.
Navigator may be
malfunctioning
Remedy
Check battery voltage.
Connect power cable firmly.
Set picture advance speed to other than STOP.
Reconnect transducer cable.
Set scale to show zero line.
Clean the transducer face.
No remedy available.
No remedy available
Change the range in order to display the bottom
echo.
Turn on Bottom Search, in the Echo image

dialog box.

Relocate the transducer.
Reconnect earth.
Contact the vessel and request that they lower
the gain on their sounder.
Activate the noise limiter.
Reconnect cable
Check navigator.