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the transducer is connected to the unit through a switch, temporarily
connect it directly to the unit and try again. If none of these items
identifies an obvious problem, the transducer itself may be the problem.
Be sure to include the transducer if returning the unit for repair.
4. When in very shallow water, I get gaps in the bottom reading
and inconsistent digital depth indication.
The 105SX will work reliably in water 3', or deeper. The depth is
measured from the transducer, not necessarily from the surface.
5. The unit comes on before I press POWER, and won’t turn off.
Check the transducer cable—if the outer jacket of the cable has been cut
and the cable is in contact with bare metal, you need to repair the cut
with electrical tape. If there is no problem with the cable, disconnect the
transducer from the unit and see if the problem is corrected, to confirm
the source of the problem.
6. I get gaps in the reading at high speeds.
Your transducer needs adjusting. If the transducer is transom-mounted,
there are two adjustments available to you—height, and running angle.
Make small adjustments and run the boat at high speeds to determine
the effect. It may take several tries to optimize high speed operation. This
can also be a result of air or turbulence in the transducer location caused
by rivets, ribs, etc.
7. My unit loses power at high speeds.
Your 105SX has over-voltage protection that turns the unit off when
input voltage exceeds 20 VDC. Some outboard motors do not effectively
regulate the power output of the engine’s alternator and can produce
voltage in excess of 20 volts when running at high RPMs. The 105SX
displays input voltage in the Diagnostic screen. Use this readout to
determine if the voltage exceeds 20 VDC.
8. The screen begins to fade out. Images are not as sharp as normal.
Check the input voltage using Diagnostic. The 105SX will not operate on
input voltages below 10 VDC.
9. The display shows many black dots at high speeds and high
sensitivity settings.
You are seeing noise or interference caused by one of several sources. Noise
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TROUBLESHOOTING