Furuno FE-700 - Manual (Page 30)

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6.5 Troubleshooting
The table below provides simple troubleshooting procedures which you may follow to restore normal
operation. If you cannot restore normal operation, contact your dealer.
SYMPTOM PROBABLE CAUSES REMEDY
Low power supply Check the supply voltage.
Fuse blown Replace the fuse.
No picture; no reading
measure
Power cable damaged Check the cable and repair.
Transducer cable damaged Repair the cable.
Transducer cable connection
loosened Tighten the connections.
No echo sounding picture
Transmitter not working Make sure the maximum output power is
selected. (See section 3.2 System Menu 1.)
Low sensitivity Increase the Gain by turning the GAIN control
clockwise.
Low reflectivity from seabed Suspect muddy seabed.
Irregular display
Marine life on transducer Remove marine life from the transducer when
dry docked.
Out of range Check the range scale setting. Loss of seabed display
Air bubbles caused by going
astern or running over other
ship wakes This is normal, it is not a sign of equipment
trouble.
Wrong installation place of
transducer Find cause of noise. Relocate the transducer if
noise persists. Heavy noise
Other echo sounders nearby If more than one echo sounder is working on
the ship, there is no ideal measure to cure the
problem.
Aeration in near surface area Not an equipment problem. Surface noise
Rough weather Not an equipment problem.