NorthStar Navigation 491 installation manual 957/958/6000i echo sounder system troubleshooting

Models: 491

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SECTION FOUR — Troubleshooting and servicing the

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

the “Initial checkout”

 

 

configured

section of this manual.

 

 

for the

 

 

 

 

491?

 

 

YES

1.Check fuses and circuit breakers.

2. Check power to 491 with

OFF

Check

STEADY

a voltmeter.

GREEN

 

3. Verify that the data cable

 

the 491's STAT

 

 

 

 

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 13: 957/958/6000i echo sounder system troubleshooting

491 INSTALLATION MANUAL Revision A

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NorthStar Navigation 491 installation manual 957/958/6000i echo sounder system troubleshooting