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Author Topic:   LOWRANCE LGC-3000 Failures
RobertRibley posted 06-01-2009 11:37 PM ET (US)   Profile for RobertRibley   Send Email to RobertRibley  
Once again my LGC-3000 module has failed. A flashing ? mark is appearing inside the cursor. This has been the the third time within 1-1/2 years. The first time I sent it in they repaired it, and it failed. They then sent me a new replacement. and it failed. Has anyone had this kind of problem? It is hooked to a LCX-27c Lowrance fish-finding sonar and mapping GPS.

Robert Ribley

jimh posted 06-01-2009 11:58 PM ET (US)     Profile for jimh  Send Email to jimh     
Robert--There have been some prior discussions in which the LOWRANCE LGC-2000 or LGC-3000 GPS module was mentioned as having failed. For example:

http://continuouswave.com/ubb/Forum6/HTML/001926.html
http://continuouswave.com/ubb/Forum6/HTML/002231.html

There has been speculation that the cause of the failures could be related to poor protection against electro-static discharge (ESD) and from exposure to high-power signals from local RADAR transmitters. It has been noted that some of the newer devices now have a sticker with the notation of "ESD Protected" or something similar.

The current model of this device is believed to be the LGC-4000.

A failure rate of three times in 18 months is not good. It would appear that the LGC-3000 device may not be very robust.

jimh posted 06-02-2009 12:06 AM ET (US)     Profile for jimh  Send Email to jimh     
Robert--Where is the LGC-3000 installed on your boat?

Do you have a RADAR?

Is the LGC-3000 routinely covered by a boat canvas which is then removed and drags across the LGC-3000?

RobertRibley posted 06-02-2009 09:16 PM ET (US)     Profile for RobertRibley  Send Email to RobertRibley     
Thanks for the reply Jim.
I do not have radar.
But yes, I do cover it after every use because there is always dust on the ranch and when removing the cover I almost always get a shock and sometimes a quite strong one. I have been told that when using down riggers
for fishing the S.S cables make a small amount of electric current. I have put a volt meter between the cables while trolling and read a very small amount of current - I believe 0.005 positive. Also when the water is like glass and my wife wants to ski at 29 mph and I tell her the GPS is not working I know she radiates a high electric current. I sent the 3000 back today and the woman at Lowrance, Barbera, said that when I get it back I will have no more problems with it.
We will see.
Thanks again for the great site and the great knowledge shared here.

Robert

RobertRibley posted 06-02-2009 09:39 PM ET (US)     Profile for RobertRibley  Send Email to RobertRibley     
The LGC 3000 is mounted on the stock Boston Whaler light shield that is plastic The light shield is mounted to an aluminum pole that is also stock that comes up through the center counsel for a light.

Robert

jimh posted 06-02-2009 11:20 PM ET (US)     Profile for jimh  Send Email to jimh     
I suggest you run a 16-AWG wire with Green insulation from the battery negative terminal bus to the area where the GPS antenna is mounted. This wire will be used as a bonding wire. Connect this bonding wire to the metal portion of the fitting or pole on which you are mounting the LOWRANCE GPS antenna module. This can likely be easily done by using one of the mounting screw fasteners as a binding post and installing an extra hex nut and washer to fasten the bonding wire to the metal fitting. This may help to prevent build up of static charges in the area around the GPS antenna which are occurring when you pull the boat canvas off the boat superstructure.

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