NorthStar Navigation NorthStar 491 manual Checking the transducer, Off

Page 69

No echoes displayed on sounder screen.

 

 

 

 

Is the

 

 

 

 

Advance

YES

 

 

 

Speed set to

 

 

 

 

 

zero?

 

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Configure the navigatorʼs

 

Has the

 

NO

navigatorʼs

 

Aux Port for the 491. See

Aux Port been

 

 

 

Section 1 of this manual

 

configured

 

for instructions.

 

 

for the

 

 

 

 

 

491?

 

 

 

 

 

 

YES

 

1. Check fuses and circuit

 

 

 

 

 

breakers.

 

 

 

 

STEADY

2. Check power to 491 with

OFF

 

Check

a voltmeter.

 

 

GREEN

the 491's STAT

3. Verify that the data cable

 

 

 

indicator

 

between the navigator and

 

 

 

 

 

 

 

the 491 is properly wired

 

 

 

 

 

and connected.

 

 

 

 

 

 

 

FLASHING

 

RED

 

 

 

GREEN

 

 

 

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

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

There's a hardware problem with the 491.

Figure 10: Troubleshooting the echo sounder (957/958)

Checking the transducer

To provide the best possible performance with the 491 echo sounder, Northstar recommends the use of an Airmar

491 Echo Sounder Operations Manual

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Contents Northstar Echo Sounder Contents Troubleshooting 491 Operations Reviewing past echoes using SoundTracPage 1Welcome Using this manual Welcome to the NorthstarOrganization Conventions Service and repair Technical supportHearing from you How echo sounding works 961/962 echo sounder system components Powering the 491 on and off Setting upUsing 491 with the 961/962 Press the Port Setup Options key Using the 491 with the 957/958961/962 echo sounder menu structure 957/958 echo sounder menu structure 2Quick Start Using the Echo Sounder Illustrated Echo screen Displaying the echo sounder’s pictureIllustrated Soundtrac screen Using demo mode At the Chart Overlay Selection window, pressChart Overlay screen Introducing the displayed information Depth and temperatureEcho sounding Navigation Status tabsCruising or fishing Using automatic modeManually overriding automatic mode Changing the frequency of echoes50 kHz 200 kHz Echo screen with both frequencies displayed Choosing a zoom mode Zooming in and outChoosing the zoom scale Using bottom lock zoom Using bottom zoomUsing bottom lock/ center zoom Accessing the setup screen Setup functionsEntering numerical values Transducer depth Changing the temperature graph’s units and scaleChanging the depth units Number of special waypoints961/962 sensor setup screen Speed and temperature sensor setup957958/ sensor setup screen 3Adjusting the Echo Sounder Picture Picture menu Adjusting the gain strong echoesGain window Adjusting the clutter weak echoesClutter window Adjusting the signal level weak echoesSuppressing interference the noise limiter Understanding the color bar Selecting the color bar hue and white levelHue and white level window Setting the white levelEcho Sounder Operations Manual 4Understanding Depth Settings Changing the depth settings Viewing the seabed depthViewing the depth marker Shift window Setting the picture’s shift starting depthSetting the picture’s range Range window Echo Sounder Operations Manual 5Other Functions Using the More key Changing the advance speed Using the More keyScope on single-frequency echo screen Displaying the A-scopeSetting the Echo screen data Using the A-scope with dual frequenciesScope on dual-frequency echo screen Echo screen data selections Bottom depth box Temperature boxIntroducing snapshots Temperature graphSpeed through the water Taking and storing a snapshotSnapshot screen 961/962 only Archiving and restoring a snapshot with a floppy diskArchiving snapshots screen 961/962 only Archiving and restoring snapshots with a Zip diskSetting up the video image overlay Echo Sounder Operations Manual 6Reviewing past echoes using SoundTrac SoundTrac screen Viewing past echoes using SoundTracNavigating to a past echo position Marking fish as waypointsSelected Cursor Position window appears Going directly to a past echo position7Setting the Alarms Setting the fish alarm Understanding the alarmsFish alarm window Setting the upper and lower marker depthsSetting inside or outside fish markers Setting the bottom alarmAlarm Turning the fish alarm on and offBottom alarm window Setting the bottom levelSetting the temperature alarm Turning the bottom alarm on and offTemperature alarm window Upper limit window is highlighted in black Turning the temperature alarm on and off When the temperature alarm sounds, an alert message is Troubleshooting the echo sounder Checking the transducer 8Troubleshooting 491 OperationsNo echoes displayed when Star key is pressed Troubleshooting the echo sounderOFF Checking the transducerMaintaining a transducer Manufacturer Model Power Northstar P/NPerformance characteristics A491 Features and SpecificationsEnvironmental characteristics Physical characteristicsScreen notations InterfacingON/OFF Manual controlsEcho Sounder Operations Manual Glossary Echo Sounder Operations Manual
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