Humminbird 500 series, 515 manual Display Problems, Problem Possible Cause

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Display Problems

There are several main conditions or sources of possible interference that may cause problems with the quality of the information displayed on the control head. Look in the following table for some symptoms of display problems and possible solutions:

Problem

Possible Cause

The control head loses If the power output of your boat’s engine is

power at high speeds. unregulated, the control head may be protecting itself using its over-voltage protection feature. Make sure the input voltage does not exceed 20 Volts.

When the boat moves at higher speeds, the bottom disappears or suddenly weakens, or the display contains gaps.

There are no fish detected, even when you know they are in the water under the boat, or sonar readings seem weak or faulty.

The transducer position may need to be adjusted. A mix of air and water flowing around the transducer (cavitation) may be interfering with the interpretation of sonar data. See your Installation Guide for suggestions on adjusting the transducer position.

Electrical noise from the boat’s engine may be interfering with sonar reception. See Finding the Cause of Noise for more information.

Sonar readings may be affected if the transducer is not positioned correctly (i.e. mounted at an angle, not straight down), or there is some kind of mechanical interference, either because it is mounted inside a hull that is too thick for proper sonar transmission, the bond between the transducer and the hull is not airtight, or because the transducer is dirty. Check with your Installation Guide for guidance on re-positioning the transducer, and make sure the transducer is clean.

Low battery voltage may be affecting the power of signal transmission.

Electrical noise from the boat’s engine may be interfering with sonar reception. See Finding the Cause of Noise for more information.

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Contents Series Operations Manual Thank You Table of Contents Alarms Menu Tab Troubleshooting How Sonar Works Peak to Peak measures power output at the highest points DualBeam Sonar Single Beam SonarQuadraBeam Plus Sonar Bait Ball Hard Bottom Rocky Bottom What’s On the DisplayStructure where fish may be hiding Big Digits View Side Beam View 575 Fishfinder only ViewsSonar View Real Time Sonar RTS Window Understanding Sonar HistoryBottom Presentation Page Page Sonar Zoom View Sonar Zoom View200/83 kHz Split Sonar View Big Digits View Side Beam View Water Surface Line for 455 kHz Sonar History Windows Page POWER/LIGHT Key Key FunctionsView Key Menu Key WAY Cursor Control KeyExit Key 575 Powering Up the UnitMenu System Page Normal Operation Start-Up Options MenuSimulator Self Test System StatusAccessory Test Sonar X-Press Menu Sensitivity Advanced Sonar, Split Sonar, Big Digits Views only Upper RangeLower Range Chart Speed Bottom View Zoom Level Quad LayoutSonar Menu Tab Beam Select Fish ID+ Fish ID Sensitivity KHz Sensitivity Zoom WidthKHz Balance Advanced Depth LinesSurface Clutter Max Depth Noise FilterWater Type Alarms Menu Tab Fish ID Alarm Depth AlarmTemp Alarm Low Battery AlarmAlarm Tone Setup Menu Tab Units Depth Units TempUnits Distance User Mode Units SpeedLanguage Restore Defaults Triplog ResetSelect Views Advanced Sonar View only Select ReadoutsDepth Offset Speed Calibration Temp OffsetSeries Doesn’t Power Up TroubleshootingProblem Possible Cause Display ProblemsIsolation Finding the Cause of NoiseSeries Fishfinder Accessories 800 ft 250 m SpecificationsPolicy on Environmental Compliance Sonar Terms GlossaryPage Page Page Page Receiver See Transmitter Page Page Page Page Page Page Page Page Page Page Page Page Contact Humminbird