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4. MAINTENANCE & TROUBLESHOOTING
4-4
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.
Troubleshooting
Symptom Cause Remedy
Battery may be dead.
Check battery voltage.
Fuse may have blown.
Check fuse in processor and transceiver units.
No echo sounder
image or depth
scale
Power cable may
have become
disconnected.
Connect power cable firmly.
Picture advance may
have been stopped.
Set picture advance speed to other than STOP. No echo sounder
image but
characters and
markers appear.
Transducer cable may
have become
disconnected.
Reconnect transducer cable.
Echo sounder
image appears but
no zero line.
Display start position
may have been
shifted.
Set scale to show zero line.
Gain setting is too low.
Raise the gain.
Marine life is adhering
to transducer face.
Clean the transducer face.
Vessel is in heavily
sedimented water
No remedy available.
Sensitivity is low.
Bottom is too soft to
return an echo.
No remedy available
Bottom is off the
screen.
Change the range in order to display the bottom
echo.
No depth indication
Bottom search is
turned off.
Turn on Bottom Search, in the Echo image
dialog box.
Transducer located
too close to engine.
Relocate the transducer.
Earth connection has
loosened.
Reconnect earth.
Heavy noise and
interference
Same-frequency echo
sounder being
operated nearby.
Contact the vessel and request that they lower
the gain on their sounder.
Activate the noise limiter.
Connector from
navigator may have
become disconnected.
Reconnect cable Position is wrong or
is not shown
(external input of
said data)
Navigator may be
malfunctioning
Check navigator.