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)
Page 64 | 491 Echo Sounder Operations Manual |
