NorthStar Navigation NorthStar 491 manual Troubleshooting the echo sounder

Page 68

Troubleshooting the echo sounder

No echoes displayed when STAR key is pressed.

Contact Northstar Service to upgrade to the latest version of 961/962 software.

Configure NMEA Port 3 for the 491. See Section 1 of this manual for instructions.

1.Check fuses and circuit breakers

2.Check power to 491 with a voltmeter.

3.Verify that the data cable between the 961/962 and the 491 is properly wired and connected.

 

 

 

Is the

 

 

 

 

Advance

YES

 

 

 

Speed set to

 

 

 

 

 

 

 

 

zero?

 

 

 

 

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

Is the

 

 

NO

961/962

 

 

software

 

 

 

 

 

 

 

 

Version 3.0 or

 

 

 

 

greater?

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Has

 

 

NO

NMEA Port 3

 

 

 

 

been configured

 

 

 

 

 

 

 

 

for the 491?

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

STEADY

 

OFF

Check

 

GREEN

 

the 491's STAT

 

 

 

 

 

 

 

 

 

 

 

indicator

 

Change the Advance Speed setting.

491 is communicating with the navigator

1.Check transducer connector for the proper wiring.

2.If wiring is correct,check transducer impedance with an ohmmeter.

3.If the transducer is open or shorted, replace it

FLASHING RED

GREEN

The 491 and the 961/962 aren't communicating properly. Check the wiring of the data cable between the 961/962

and the 491.

There's a hardware problem with the 491.

Figure 9: Troubleshooting the echo sounder (961/962)

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491 Echo Sounder Operations Manual

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Contents Northstar Echo Sounder Contents Reviewing past echoes using SoundTrac Troubleshooting 491 OperationsPage 1Welcome Organization Using this manualWelcome to the Northstar Conventions Hearing from you Service and repairTechnical support How echo sounding works 961/962 echo sounder system components Using 491 with the 961/962 Powering the 491 on and offSetting up Using the 491 with the 957/958 Press the Port Setup Options key961/962 echo sounder menu structure 957/958 echo sounder menu structure 2Quick Start Using the Echo Sounder Displaying the echo sounder’s picture Illustrated Echo screenIllustrated Soundtrac screen Chart Overlay screen Using demo modeAt the Chart Overlay Selection window, press Depth and temperature Introducing the displayed informationEcho sounding Navigation Status tabsUsing automatic mode Cruising or fishing50 kHz 200 kHz Manually overriding automatic modeChanging the frequency of echoes Echo screen with both frequencies displayed Choosing the zoom scale Choosing a zoom modeZooming in and out Using bottom zoom Using bottom lock zoomUsing bottom lock/ center zoom Setup functions Accessing the setup screenEntering numerical values Changing the temperature graph’s units and scale Transducer depthChanging the depth units Number of special waypointsSpeed and temperature sensor setup 961/962 sensor setup screen957958/ sensor setup screen 3Adjusting the Echo Sounder Picture Adjusting the gain strong echoes Picture menuAdjusting the clutter weak echoes Gain windowAdjusting the signal level weak echoes Clutter windowSuppressing interference the noise limiter Selecting the color bar hue and white level Understanding the color barSetting the white level Hue and white level windowEcho Sounder Operations Manual 4Understanding Depth Settings Viewing the depth marker Changing the depth settingsViewing the seabed depth Setting the picture’s shift starting depth Shift windowSetting the picture’s range Range window Echo Sounder Operations Manual 5Other Functions Using the More key Using the More key Changing the advance speedDisplaying the A-scope Scope on single-frequency echo screenScope on dual-frequency echo screen Setting the Echo screen dataUsing the A-scope with dual frequencies Bottom depth box Temperature box Echo screen data selectionsTemperature graph Introducing snapshotsSpeed through the water Taking and storing a snapshotArchiving and restoring a snapshot with a floppy disk Snapshot screen 961/962 onlyArchiving and restoring snapshots with a Zip disk Archiving snapshots screen 961/962 onlySetting up the video image overlay Echo Sounder Operations Manual 6Reviewing past echoes using SoundTrac Viewing past echoes using SoundTrac SoundTrac screenMarking fish as waypoints Navigating to a past echo positionGoing directly to a past echo position Selected Cursor Position window appears7Setting the Alarms Understanding the alarms Setting the fish alarmSetting the upper and lower marker depths Fish alarm windowSetting the bottom alarm Setting inside or outside fish markersAlarm Turning the fish alarm on and offSetting the bottom level Bottom alarm windowTemperature alarm window Setting the temperature alarmTurning the bottom alarm on and off Turning the temperature alarm on and off Upper limit window is highlighted in blackWhen the temperature alarm sounds, an alert message is 8Troubleshooting 491 Operations Troubleshooting the echo sounder Checking the transducerTroubleshooting the echo sounder No echoes displayed when Star key is pressedChecking the transducer OFFManufacturer Model Power Northstar P/N Maintaining a transducerA491 Features and Specifications Performance characteristicsPhysical characteristics Environmental characteristicsScreen notations InterfacingManual controls ON/OFFEcho Sounder Operations Manual Glossary Echo Sounder Operations Manual
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