Manuals / Humminbird / Marine Equipment / Fish Finder

Humminbird 937C DF COMBO Finding the Cause of Noise, Other electronic devices, Noise re-appears

Models: 937C DF COMBO 937C DF 937C COMBO

1 91

Download 91 pages 59.54 Kb

Page 85

www..reelsche93x Man 531370-1mA - vs4atic.qxd 2/18/2005..com11:12 AM Page 85

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.

80

Image 85

Humminbird 937C DF COMBO, 937C COMBO Finding the Cause of Noise, Other electronic devices, Noise re-appears, Boat’s engine

Contents

Page Thank YOU Table of Contents Menu System Start-Up Options Menu Contact Humminbird HOW the 900 Series Works Series IntroductionSingle Beam Sonar Dualbeam Plus SonarMulti-Media Card MMC/SD Slot MULTI-MEDIA Card MMC/SD SlotInstallation 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 Back of Control Head IN-DASH Mounting the Control Head Temperature Plug Cable Connector Assembly to Back of Control HeadConnecting the Control Head Power Cable to the Boat Transducer InstallationTo determine transducer mounting location Transom Transducer InstallationDetermine transducer mounting location Route the transducer cableMoves clockwise as the boat moves Corner of the templateNormal Cavitation Confirm that the pivot angle has not changedAttaching the Bracket To attach the pivot to the transducer Dual frequency unitForce is necessary to pivot the assembly Order to gain access to the mounting screws,To route the transom transducer cable all transducers Trial 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 Inside the HullTest and Finish the Transducer Installation Trolling Motor Transducer InstallationIf you have… Then use Stem Mounting with AN Existing 1 14 Thread StemHand-tighten only Follow these steps to stem mount the GPS receiverTo the cable as shown Access Under Mounting LocationFinish Routing the Cable and Check GPS Receiver Operation No Access Under Mounting LocationInstall the Speed accessory Speed Accessory InstallationHand tighten only Routing the speed cable to the control head Cleaning the Speed accessoryRotating Retaining Axial Clip to Remove Paddlewheel To test the installation Testing the System InstallationPowering UP the Control Head Getting Started Using Your 900 SeriesSeries 937c DF Combo Title Screen Triplog WHAT’S on the Sonar DisplayReal Time Sonar RTS Window Understanding Sonar HistoryBottom Presentation KEY Functions POWER/LIGHT KEYMARK/GOTO key Info key Zoom +/- key Menu KEY View KEYWAY Cursor Control KEY Fishing requirements see View Menu TabExit KEY View Preset KeysInfo KEY MARK/GOTO KEYViews and Readouts ViewsSonar views Navigation viewsSonar Zoom View Sonar ViewSonar View Split Sonar View Sonar Zoom ViewBird’s Eye View BIRD’S EYE ViewChart View with Active Cursor Chart/Bird’s Eye Combo View1112 Chart/Sonar Combo ViewChart View with Cursor Present Chart OrientationNavigation Waypoints, Routes and Tracks To save the marked position as a waypointNavigate to a Waypoint or Position Chart View with Grid Chart View with TargetADD a Waypoint Target or Trolling Grid Save or Clear a Current Track Press Menu Menu SystemSTART-UP Options Menu Sonar Tab, Normal ModeStart-Up Options Menu Normal Operation Exit Normal operation by powering your 900 Series offSimulator SimulatorSelf Test Accessory Test Accessory TestSystem Status Self TestSonar X-PRESS Menu GPS Diagnostic ViewSensitivity Active SideSplit Position To adjust the Lower Range To adjust the Upper RangeUpper Range Lower RangeZoom Level Chart SpeedBottom Lock Sonar ColorsNavigation X-Press Menu Highlight Split Position on the Navigation X-Press MenuClear Current Track Save Current TrackSave Current Route Remove Target Cancel NavigationRemove Grid Beam Select Sonar Menu TABTo use Beam Select Highlight Beam Select on the Sonar main menuFish ID+ To change the Fish ID Sensitivity settingFish ID Sensitivity To turn Fish ID+ on or offBottom View To adjust the Bottom ViewZoom Width To change the Zoom WidthDepth Lines KHZ SensitivitySurface Clutter Noise FilterWater Type MAX DepthTransducer Select Color BAR Temperature GraphNavigation Menu TAB Routes TracksWaypoints Trolling Grid Rotation North ReferenceTrackpoint Interval Track MIN DistanceExport ALL NAV Data MAP DatumDelete ALL NAV Data Chart Detail Level Chart Menu TABTo change the Chart Detail Level setting To change the Map Borders settingSpot Soundings LAT/LON GridShaded Depth SET MAP Offset Alarms Menu TABClear MAP Offset Fish ID Alarm Depth AlarmLOW Battery Alarm Temp AlarmArrival Alarm OFF Course AlarmDrift Alarm To change the Off Course Alarm settingTo change the Alarm Tone setting Alarm ToneHighlight Alarm Tone on the Alarms main menu To change the Units Depth setting Setup Menu TABTo change the Units Temp setting Units DepthUnits Distance User ModeUnits Speed LanguageRestore Defaults Triplog ResetTo Reset Triplog To Restore DefaultsTo Select Readouts Default Sonar View Customized Sonar ViewTemp Offset Depth OffsetSpeed Calibration Local Time ZonePosition Format Daylight Saving TimeSonar Nmea OutputFollowing Nmea sentences are output To turn Nmea Output on or offViews Menu TAB Accessories Menu TABTo Change the View Status of Any View Highlight the View main menu tabSeries Doesn’t Power Up TroubleshootingSeries Defaults to Simulator with a Transducer Attached Problem Possible Cause 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 Power Output SpecificationsPlace on bottom of hull Appendix aAlign with transom Appendix B Contact Humminbird