Humminbird LCR 40.ID manual Unit comes on before I press POWER, and wont turn off

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MAINTENANCE AND WARRANTY

TROUBLESHOOTING

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.

Most Humminbird fishfinders have 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. Your fishfinder displays input voltage in the Diagnostic screen. Use this readout to determine if the voltage exceeds 20 VDC.

8. The screen begins to fadeout. Images are not as sharp as normal.

Check the input voltage using Diagnostic. The fishfinder 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 can be caused by other electronic devices. Turn off any nearby electronics and see if the problem goes away. Noise can also be caused by the engine. If engine noise is causing the interference, the problem will intensify at higher RPMs. Increase the engine speed with the boat stationary to isolate this cause. Propeller cavitation can appear as noise on-screen. If the transducer is mounted too close to the propeller, the turbulence generated can interfere with the sonar signal. Ensure that the transducer is mounted at least 15" (38cm) from the prop.

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Contents Page Table of Contents Transducer Mounting Procedure Transducer Mounting OptionsTransom Mounting Procedure Page Page Page Inside Hull Mounting Procedure Page Installing the LCR Installing the Cables Other Mounting OptionsPage Installation Test the InstallationIntroduction Theory of OperationUsing the LCR Using the LCR Total Screen Update What is Total Screen Update?How Does Total Screen Update Work? How To Use Total Screen UpdateOperational Instructions LCRUsing the LCR Automatic or Manual Mode How To Use Zoom What Zoom DoesSome Additional Things You Should Know About Zoom Bottom LockFish Alarm Bottom AlarmUsing the LCR Reading will not be seen while in the manual mode Additional Information Some additional things you should know about the LCRCaring for Your LCR Learning to USE Your LCR StepUsing the LCR Using the LCR Learning to Read the Display Using the LCR Maintenance and Warranty MaintenanceTroubleshooting Nothing happens when I turn the unit onThere is no bottom reading visible on the display Unit comes on before I press POWER, and wont turn off Humminbird ONE Year Full Warranty Service Policy Customer Support
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