3. MAINTENANCE & TROUBLESHOOTING
3-3
Sensitivity is low. • Gain setting is too low. Raise the gain.
• Marine life is adhering to transducer face. Clean the trans-
ducer face.
• Vessel is in heavily sedimented water.
• Bottom is too soft to return an echo.
Extreme interference
or noise.
• Transducer is located too close to the engine. Relocate the
transducer.
• Ground wire has loosened or damaged. Check the wire, and
reconnect or replace it as necessary.
• Same-frequency echo sounder is operating nearby.
No depth indication. • Bottom is off the screen. Change the range setting.
Speed and/or water
temperature readout is
unrealistic or not
shown.
• The sensor cable is disconnected or damaged. Check the
cable, and reconnect or replace it as necessary.
• The sensor is malfunctioning. Check the sensor.
Position readout is un-
realistic or not shown.
• The cable connected to the navigation equipment is discon-
nected or damaged. Check the cable, and reconnect or re-
place it as necessary.
• The navigation equipment is malfunctioning. Check the nav-
igation equipment.
Problem Reason, remedy
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