LowranceNET Blue Troubleshooting

  1. Turn the unit off and back on.  Check to see if GPS is now responding.  If GPS is not responding, please proceed to next step.
     
  2. (Y-Cable):  Please make sure 60 Ohm terminator is in place on the GPS cable.  Please see the following illustration.
     
  3. (Hard tee and cables):  For the hard tee and cables make sure the 120 Ohm terminators are in place at opposite ends of the network.
    LGC-2000 direct connection to GPS unit
     
  4. Reset the unit:
    Below are the instructions for the soft reset for your unit. 
    Soft Reset:
    1. Turn unit OFF
    2. Press and hold the PAGES key
    3. Press and hold the PWR key
    4. Release both buttons when the unit powers up to the alarm box
     
    Note:    Press the menu key twice and highlight NMEA 2000, now press Enter.  Bus Setup will be high lighted and you will press Enter again.  Right arrow to highlight Diagnostics and under the Controller Status, check the amount of Rx (Receiving) and Tx (Transmit) errors you have.  You should expect zero errors if the network is functioning properly and there are no shorts.  If you see anything other than zero, you will need to contact our customer service department at 1-800-324-1356 with the information.
     
  5. You will need a volt meter to proceed from this point:
    Not a test light, we will need the voltage readings for evaluating the problem.
    Volt meter
     
  6. On the End of the GPS cable that connects to the antenna, measure ground lead on Pin 1 and (+) red, positive lead on Pin 2.  See the following illustration.
    Pinout diagram
    You should get approximately 12 volts of power.  If 12 volts are present, please contact us with test results to send module in for repair.  If 12 volts are not    present, please proceed to the next step.
     
  7. Unplug the GPS cable from the back of the unit.  Measure voltage on the network connector on the back of the unit.  Measure ground lead on Pin 1 and (+) red, positive lead on Pin 2.  See the following illustration:
    Pinout diagram of connector on back of unit case
    If 12 volts are present, please contact us with test results.  We will need to replace GPS cable. 
    If 12 volts are not present, please proceed to next step.
     
  8. Turn unit off and disconnect the power cable.  See the following illustration:
     Power cable pinout diagram
  9. Please note that pins 7 & 8 are main power for the unit’s sonar.  Pin 7 is positive (+) and Pin 8 is ground (-).  Needs 12 volts of power for unit to come on.  
     
  10. Test ground lead to Pin 9 and (+) red to Pin 1, this is NMEA 2000 GPS power for the antenna.  If you are receiving 12 volts of power, please contact us with your test results.  Your unit will need to be sent in for service.  If you are not receiving approximately 12 volts of power, please proceed to the next step.  
     
  11. Make sure the NMEA 2000 leg of the power cable is connected, red to positive, black and shield to ground or negative.  See illustration of power cable below:
    Power data cable diagram
     
  12. Check fuse to make sure it has not blown on NMEA 2000 leg of the power cable. 
     
  13. On the NMEA 2000 leg of the power cable, open the in line fuse holder.  Make sure the fuse is in the side of the holder connected to the power source (battery).  With volt meter, place positive lead on fuse, negative lead to a ground source.  This should read 12 volts and will tell you that the fuse is good. 
     
     
    Note:  If your GPS is not using the Y-Cable it may be using the hard or soft plastic “T” connector with a shorter cable and 60 ohm terminator. See the diagram below. The same troubleshooting steps outlined above would need to be taken for voltage checks regarding the 12VDC power to the corresponding pins on the back case Network port, shorter Network cable and base of the “T” connector pin holes.

T connector

Y cable