Humminbird Model Matrix 87 Display Problems, Finding the Cause of Noise, 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 power at If the power output of your boat’s engine is unregulated,

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

Finding the Cause of Noise

Electrical noise usually affects the display with many black dots at high speeds, and high sensitivity readings. One or more of the following sources can cause noise or interference:

Possible Source of Noise

Isolation

Other electronic devices

Turn off any nearby electronic devices to see if the

 

problem goes away, then turn them on one at a time to

 

see if the noise re-appears.

The boat’s engine

To determine whether the boat’s engine is the source of

 

the noise, increase the RPMs while the boat is in neutral

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 boats engine may be interfering with sonar reception. See Finding the Cause of Noise for more information.

 

and stationary to see if the noise increases

 

proportionately; if noise appears when you rev the

 

engine, the problem could be the spark plugs, alternator,

 

or tachometer wiring. Replace the spark plugs with

 

resistor plugs, install an alternator filter, or route the

 

control head power and transducer cables away from the

 

engine wiring.

Cavitation from the boat’s

Turbulence created by the propeller can cause noise;

propeller

make sure the transducer is mounted at least 15” (38 cm)

 

from the propeller, and that the water flows smoothly

 

over the face of the transducer at all times.

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Contents Matrix 87c Operations Manual Thank You Table of ContentsNavigation X-Press Menu Navigation Views Only Alarms Menu TabSetup Menu Tab Sonar X-Press Menu Sonar Views OnlyDualBeam Plus Sonar How Sonar WorksQuadraBeam Sonar With Optional-Purchase WideSide Transducer WideSide SonarHow GPS and Cartography Work Multi-Media Card MMCHigh Sonar Intensity Return Bait Ball KHz Blue Fish SymbolKHz Orange Fish Symbol What’s On the Sonar DisplaySonar View ViewsSonar views Real Time Sonar RTS Window Understanding Sonar HistoryBottom Presentation 200/83 kHz Split Sonar View Sonar Zoom ViewSide Beam View Big Digits ViewSide Beam View Big Digits ViewBird’s Eye View WideSide ViewBird’s Eye View View Orientation Chart ViewChart View with Active Cursor Combo ViewWaypoints, Routes and Tracks Viewing CartographyIntroduction to Navigation Waypoints, Routes and TracksNavigate to a Waypoint or Position Save, Edit, or Delete a WaypointChart View with Grid Chart View with TargetAdd a Waypoint Target or Trolling Grid Save or Clear a Current Track Save, Edit or Delete a RouteEdit, Delete or Hide Saved Tracks Info Key POWER/LIGHT KeyKey Functions View KeyZoom +/- Key Accessory BusPowering Up the Unit Goto KeySonar Tab, Normal Mode Sonar Tab, Advanced Mode Main Menu System Normal User ModeMenu System Normal Operation Exit Normal operation by powering your Matrix offExit the Simulator by powering your Matrix off Start-Up Options MenuSystem Status Exit PC Connect mode by powering the Matrix offPC Connect Sonar Views Only Sonar X-Press MenuSide View SensitivitySide Beam Range Chart SpeedUpper Range Lower RangeNavigation Views Only To adjust the Bottom ViewBottom View Navigation X-Press MenuSave Current Route Cancel NavigationSave Current Track Clear Current TrackOnly if a Grid is Active Remove GridSonar Window Sonar Menu TabHighlight Beam Select on the Sonar main menu Beam SelectFish ID+ To use Beam SelectWideSide Sensitivity Fish SensitivityKHz Sensitivity KHz BalanceSurface Clutter Depth LinesNoise Filter Navigation Menu Tab Max DepthWater Type Transducer SelectWaypoints TracksRoutes Spot Soundings Chart Detail LevelMap Borders Lat/Lon GridMap Datum Grid RotationTrackpoint Interval Track Min DistanceTo Clear Map Offset Alarms Menu TabClear Map Offset Delete All Nav DataTemp Alarm Depth AlarmFish ID Alarm Low Battery AlarmDrift Alarm Arrival AlarmAlarm Tone Units Distance Setup Menu TabUnits Depth Units TempUnits Speed User ModeTriplog Reset Restore DefaultsSpeed Calibration Select ReadoutsDepth Offset Temp OffsetTime Format Local Time ZoneDaylight Savings Time Position FormatSonar Nmea OutputMatrix Defaults to Simulator with a Transducer Attached Accessories Menu TabTroubleshooting Matrix Doesn’t Power UpIsolation Display ProblemsProblem Possible Cause Finding the Cause of NoiseSpecifications Matrix AccessoriesContact Humminbird
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