Humminbird 947C manual Finding the Cause of Noise, Other electronic devices, Noise re-appears

Page 86

531374-1_A - 947 Man.qxd 2/15/2005 7:54 PM Page 86

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 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 propeller

Turbulence created by the propeller can cause noise; 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.

81

Page 85 Page 87
Image 86
Page 85 Page 87
Contents 531374-1A 947 Man.qxd 2/15/2005 752 PM Thank You Table of Contents 3D Sonar X-Press Menu Menu System Start-Up Options Menu2D Sonar X-Press Menu Navigation X-Press MenuSetup Menu Tab Chart Menu TabAlarms Menu Tab Views Menu Tab Accessories Menu Tab Troubleshooting3D Sonar Series IntroductionHOW the 900 Series Works 2D SonarSD Slot GPS and CartographyMULTI-MEDIA Card MMC SD Slot Accessory Bus Accessory BUSInstallation Overview 900 Series has a wide variety of configurationsGimbal Mounting the Control Head Control Head InstallationBasic installation tasks that you must perform include Mounting Screws Washer Gimbal Mounting Bracket Cables Routed Near Mounting Bracket Plug Cable Connector Assembly to Back of Control Head Screws providedIN-DASH Mounting the Control Head Plug Cable Connector Assembly to Back of Control Head Transducer Installation Connecting the Control Head Power Cable to the BoatStepped Hull Transom Transducer InstallationTo determine transducer mounting location But do not completely tighten To mount the transducer bracket to the boatTo attach the pivot to the transducer Attaching the BracketNormal Cavitation To mount the transducer pivot assembly to the bracketTo adjust the running position of the transducer Fully tightened To route the transom transducer cableReassemble Routing the CableDetermine the transducer mounting location Inside the Hull Transducer InstallationTrial installation Make sure the position of the transducer is marked Permanently mount the transducerRoute the cable Transducer Mounted Inside the HullTest and Finish the Transducer Installation Trolling Motor Transducer InstallationHand-tighten only GPS Receiver InstallationIf you have… Then use Follow these steps to stem mount the GPS receiverTo the cable as shown Access Under Mounting LocationAccess Under Mounting Location No Access Under Mounting Location Finish Routing the Cable and Check GPS Receiver OperationInstall the temperature probe accessory Routing the cable to the control headTesting the System Installation To test the installationPowering UP the Control Head Series 947c 3D Combo Title ScreenWHAT’S on the 3D Sonar Display TriplogWHAT’S on the 2D Sonar Display Bait Ball RTS Real Time Sonar WindowReal Time Sonar RTS Window Bottom PresentationView KEY POWER/LIGHT KEYKEY Functions Menu KEYExit KEY View Preset KeysWAY Cursor Control KEY Info KEYViews available on your 900 Series are MARK/GOTO KEYViews 3D/2D Combo View Views and Readouts3D/2D Combo View 2D Sonar View 2D Sonar View2D Zoom View 2D Zoom ViewBeam Sonar View Beam Sonar ViewBIRD’S EYE View Bird’s Eye ViewChart/Bird’s Eye Combo View with Active Cursor CHART/BIRD’S EYE Combo ViewChart View Chart View with Active CursorChart/2D Combo View CHART/3D Combo ViewCHART/2D Combo View Viewing Cartography Chart OrientationChart View with Cursor Present Waypoints, Routes and Tracks WAYPOINTS, Routes and TracksNavigation SAVE, EDIT, or Delete a Waypoint ADD a Waypoint Target or Trolling Grid Chart View with TargetNavigate to a Waypoint or Position Chart View with Grid SAVE, Edit or Delete a RouteMenu System Save or Clear a Current TrackEDIT, Delete or Hide Saved Tracks Sonar Tab, Normal Mode Sonar Tab, Advanced ModeNormal Operation Exit Normal operation by powering your 900 Series offSTART-UP Options Menu Start-Up Options MenuSimulator Self Test Accessory Test GPS Diagnostic ViewExit the Simulator by powering your 900 Series off System StatusAccessory Test Screen Accessory TestGPS Diagnostic View GPS Diagnostic ViewActive Side To Adjust Split Screen Position2D Sonar X-PRESS Menu Split PositionSensitivity To adjust the SensitivityTo adjust the Upper Range Upper RangeBottom Lock Chart SpeedLower Range 2D/3D Priority To adjust the Bottom RangeBottom Range To change the 2D/3D Priority3D Sonar X-Press Menu 3D Sonar X-PRESS MenuHighlight Split Position on the 3D Sonar X-Press Menu 3D Lower Range Beam Sensitivity3D Bottom Zoom To Reset 3D View Reset 3D ViewTo adjust the 3D History 3D HistoryHighlight Split Position on the Navigation X-Press Menu Navigation X-Press MenuSave Current Route Save Current TrackClear Current Track Skip Next WaypointRemove Grid Cancel NavigationRemove Target 3D Bottom Style Sonar Menu TAB2D Sonar Colors 3D Frame StyleTo change Beam Select 2D Beam SelectFish ID+ To set Fish ID+To change the Fish ID 3D Reference setting To change the Fish ID Sensitivity settingTo change the RTS Window setting Fish ID SensitivityKHZ Sensitivity Bottom ViewZoom Width Depth LinesSurface Clutter To change the Noise Filter settingTo change the Max Depth setting Noise FilterColor BAR Temperature GraphWater Type Waypoints Navigation Menu TABTracks Routes To change the Chart Orientation settingTo change the North Reference setting North ReferenceTrack MIN Distance Trolling Grid RotationTrackpoint Interval MAP DatumDelete ALL NAV Data Chart Menu TABExport ALL NAV Data To Export All Navigation DataLAT/LON Grid Chart Detail LevelMAP Borders Spot SoundingsClear MAP Offset Shaded DepthSET MAP Offset Fish ID Alarm Alarms Menu TABDepth Alarm To change the Depth Alarm settingOFF Course Alarm LOW Battery AlarmTemp Alarm Alarm Tone Arrival AlarmDrift Alarm To change the Units Temp setting Setup Menu TABTo change the Units Depth setting Units DepthUnits Speed User ModeUnits Distance LanguageSelect Readouts Triplog ResetRestore Defaults Default Sonar View Customized Sonar View To Select ReadoutsLocal Time Zone Depth OffsetTemp Offset Daylight Saving TimeDate Format Position FormatTime Format Nmea OutputTo turn Nmea Output on or off SonarViews Menu TAB To turn Sonar on or offSeries Doesn’t Power Up Accessories Menu TABTroubleshooting Series Defaults to Simulator with a Transducer Attached Display Problems Control head loses power at high speedsNoise re-appears Finding the Cause of NoiseOther electronic devices Boat’s engineYear Limited Warranty Humminbird Service PolicyFor IN-WARRANTY service, complete the following steps Returning Your Unit for ServiceSeries Accessories Specifications Operating FrequencyAppendix a Contact Humminbird
Top Page Image Contents