Humminbird 947C manual Display Problems, Control head loses power at high speeds

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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 high speeds.

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.

If the power output of your boat’s engine is unregulated, the control head may be protecting itself using its over-voltage protection feature. Make sure the input voltage does not exceed 20 Volts.

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.

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Contents 531374-1A 947 Man.qxd 2/15/2005 752 PM Thank You Table of Contents 2D Sonar X-Press Menu Menu System Start-Up Options Menu3D Sonar X-Press Menu Navigation X-Press MenuAlarms Menu Tab Chart Menu TabSetup Menu Tab Views Menu Tab Accessories Menu Tab TroubleshootingHOW the 900 Series Works Series Introduction3D Sonar 2D SonarMULTI-MEDIA Card MMC SD Slot GPS and CartographySD Slot Installation Overview Accessory BUSAccessory Bus 900 Series has a wide variety of configurationsBasic installation tasks that you must perform include Control Head InstallationGimbal Mounting the Control Head Mounting Screws Washer Gimbal Mounting Bracket Cables Routed Near Mounting Bracket Screws provided Plug Cable Connector Assembly to Back of Control HeadIN-DASH Mounting the Control Head Plug Cable Connector Assembly to Back of Control Head Connecting the Control Head Power Cable to the Boat Transducer InstallationTo determine transducer mounting location Transom Transducer InstallationStepped Hull To attach the pivot to the transducer To mount the transducer bracket to the boatBut do not completely tighten Attaching the BracketTo adjust the running position of the transducer To mount the transducer pivot assembly to the bracketNormal Cavitation Reassemble To route the transom transducer cableFully tightened Routing the CableTrial installation Inside the Hull Transducer InstallationDetermine the transducer mounting location Route the cable Permanently mount the transducerMake sure the position of the transducer is marked Transducer Mounted Inside the HullTrolling Motor Transducer Installation Test and Finish the Transducer InstallationIf you have… Then use GPS Receiver InstallationHand-tighten only Follow these steps to stem mount the GPS receiverAccess Under Mounting Location Access Under Mounting LocationTo the cable as shown Finish Routing the Cable and Check GPS Receiver Operation No Access Under Mounting LocationRouting the cable to the control head Install the temperature probe accessoryTo test the installation Testing the System InstallationSeries 947c 3D Combo Title Screen Powering UP the Control HeadTriplog WHAT’S on the 3D Sonar DisplayBait Ball RTS Real Time Sonar Window WHAT’S on the 2D Sonar DisplayBottom Presentation Real Time Sonar RTS WindowKEY Functions POWER/LIGHT KEYView KEY Menu KEYWAY Cursor Control KEY View Preset KeysExit KEY Info KEYViews MARK/GOTO KEYViews available on your 900 Series are 3D/2D Combo View Views and Readouts3D/2D Combo View 2D Sonar View 2D Sonar View2D Zoom View 2D Zoom ViewBIRD’S EYE View Beam Sonar ViewBeam Sonar View Bird’s Eye ViewChart View CHART/BIRD’S EYE Combo ViewChart/Bird’s Eye Combo View with Active Cursor Chart View with Active CursorCHART/2D Combo View CHART/3D Combo ViewChart/2D Combo View Chart View with Cursor Present Chart OrientationViewing Cartography Navigation WAYPOINTS, Routes and TracksWaypoints, Routes and Tracks SAVE, EDIT, or Delete a Waypoint Navigate to a Waypoint or Position Chart View with TargetADD a Waypoint Target or Trolling Grid SAVE, Edit or Delete a Route Chart View with GridEDIT, Delete or Hide Saved Tracks Save or Clear a Current TrackMenu System Sonar Tab, Advanced Mode Sonar Tab, Normal ModeSTART-UP Options Menu Exit Normal operation by powering your 900 Series offNormal Operation Start-Up Options MenuExit the Simulator by powering your 900 Series off Self Test Accessory Test GPS Diagnostic ViewSimulator System StatusGPS Diagnostic View Accessory TestAccessory Test Screen GPS Diagnostic View2D Sonar X-PRESS Menu To Adjust Split Screen PositionActive Side Split PositionTo adjust the Upper Range To adjust the SensitivitySensitivity Upper RangeLower Range Chart SpeedBottom Lock Bottom Range To adjust the Bottom Range2D/3D Priority To change the 2D/3D PriorityHighlight Split Position on the 3D Sonar X-Press Menu 3D Sonar X-PRESS Menu3D Sonar X-Press Menu 3D Bottom Zoom Beam Sensitivity3D Lower Range To adjust the 3D History Reset 3D ViewTo Reset 3D View 3D HistoryNavigation X-Press Menu Highlight Split Position on the Navigation X-Press MenuClear Current Track Save Current TrackSave Current Route Skip Next WaypointRemove Target Cancel NavigationRemove Grid 2D Sonar Colors Sonar Menu TAB3D Bottom Style 3D Frame StyleFish ID+ 2D Beam SelectTo change Beam Select To set Fish ID+To change the RTS Window setting To change the Fish ID Sensitivity settingTo change the Fish ID 3D Reference setting Fish ID SensitivityZoom Width Bottom ViewKHZ Sensitivity Depth LinesTo change the Max Depth setting To change the Noise Filter settingSurface Clutter Noise FilterWater Type Temperature GraphColor BAR Tracks Navigation Menu TABWaypoints To change the North Reference setting To change the Chart Orientation settingRoutes North ReferenceTrackpoint Interval Trolling Grid RotationTrack MIN Distance MAP DatumExport ALL NAV Data Chart Menu TABDelete ALL NAV Data To Export All Navigation DataMAP Borders Chart Detail LevelLAT/LON Grid Spot SoundingsSET MAP Offset Shaded DepthClear MAP Offset Depth Alarm Alarms Menu TABFish ID Alarm To change the Depth Alarm settingTemp Alarm LOW Battery AlarmOFF Course Alarm Drift Alarm Arrival AlarmAlarm Tone To change the Units Depth setting Setup Menu TABTo change the Units Temp setting Units DepthUnits Distance User ModeUnits Speed LanguageRestore Defaults Triplog ResetSelect Readouts To Select Readouts Default Sonar View Customized Sonar ViewTemp Offset Depth OffsetLocal Time Zone Daylight Saving TimeTime Format Position FormatDate Format Nmea OutputViews Menu TAB SonarTo turn Nmea Output on or off To turn Sonar on or offTroubleshooting Accessories Menu TABSeries Doesn’t Power Up Series Defaults to Simulator with a Transducer Attached Control head loses power at high speeds Display ProblemsOther electronic devices Finding the Cause of NoiseNoise re-appears Boat’s engineHumminbird Service Policy Year Limited WarrantySeries Accessories Returning Your Unit for ServiceFor IN-WARRANTY service, complete the following steps Operating Frequency SpecificationsAppendix a Contact Humminbird