Moderated Discussion Areas
  ContinuousWave: Small Boat Electrical
  Lowrance LCX-112C problems

Post New Topic  Post Reply
search | FAQ | profile | register | author help

Author Topic:   Lowrance LCX-112C problems
erik selis posted 03-10-2008 03:08 AM ET (US)   Profile for erik selis   Send Email to erik selis  
My fishing buddy just recently bought this Lowrance LCX-112C GPS/Sonar. It is a very nice piece of electronics. Regretfully he has been having some problems with it and the dealer has not been able to solve the problem yet. Here's what happens:

The unit is set to auto range and this will work perfectly for a while. Then suddenly the unit will jump to a setting where the maximum depth is only 6 feet deep eventhough it may be 25 feet deep. It will stay in this low depth setting until the unit is reset. It will also show strange colored lines while in this state as if it keeps zooming in. The dealer has given him a new transducer and updated software to try out but to no avail. The next step would be to replace the whole unit.

Does anyone here have any ideas what the problem could be? Maybe it's just a parameter setting that's not correct that we haven't discovered yet.



bigjohn1 posted 03-10-2008 07:10 AM ET (US)     Profile for bigjohn1  Send Email to bigjohn1     
Eric, I'll give it a stab but please answer a few questions first:

1. Is the boat in motion when this funny thing happens while in auto range?
2. Does it happen both while at rest and at speed?
3. If it only happens at speed, does it happen at all speeds or only when he goes faster than XX mph?
4. When he switches the unit to manual range, does it show the bottom clearly and mark fish?
5. Does it happen at either frequency setting (50 and 200kHz) or just one frequency?

I have had this happen on my Navman/Northstar unit when I first bought it but I had manually adjusted the frequency to 50kHz and max power (600W). I was in shallow water (40-60ft) running at high speed. Slowing down and resetting the unit to 200kHz clearled it up and it began to read correctly. I did have one more incidence of this about a year later and could not get the unit to read correctly no mater what I tried. Northstar replaced the internal processor under warranty and it has worked fine ever since.

jimh posted 03-10-2008 08:39 AM ET (US)     Profile for jimh  Send Email to jimh     
I also have a Lowrance SONAR, and it also seems to work itself into some setting where it has lost the true bottom and is giving false readings. I have found that the fastest and most reliable way to remedy this situation is to shut off the power to the unit for a few seconds and then restart it.

I mentioned this to some friends who have used similar Lowrance units and who have much greater experience with them than I do, and who also use them much more for locating fish rather than just sounding the bottom, as I figured they would be more familiar with all the possible adjustments. When I explained the problem I was having, they just nodded their heads, and said, "Shut it off and restart it."

erik selis posted 03-10-2008 11:27 AM ET (US)     Profile for erik selis  Send Email to erik selis     

1)Yes, the boat is in motion. Usually after a fast run and slowing down.
2)It usually happens after a fast run. Sometimes it just starts when it's at rest as well. Even when we're not using the main engine or the electric-motor. BTW, the sonar is not connected to the electric-motor battery. It is connected to the main battery.
3)Yes, when you switch it manually it runs correct again. When you then put it back to auto range it will also work correctly for a while. It shows the bottom clearly and marks fish. At least it looks like it does. Then it jumps into the shallow range on it's own and gives false readings.
4)It does this at both frequencies. We set it standard to 200kHz and also tried it at 50kHz. When it jumps to shallow range it looks (by the color) that it also jumps to 50kHz on it's own. But this I'm not sure of. Only judging by the color.

Jim I also have a Lowrance depth finder. It works fine for me in auto range. I have never had the same problem as my buddy Dirk Thyssen. For my inexpensive unit I would also just reset it by turning it on and off, especially now after 5 years but in his case you would expect a 2600 Euro unit to work correctly and not have to shut it on and off.

I have a feeling that there must be a bad chip in there or a software bug. Funny thing is that the software has already been updated.

Thanks for your help so far guys.


bigjohn1 posted 03-11-2008 07:34 AM ET (US)     Profile for bigjohn1  Send Email to bigjohn1     

Given your responses, it seems like you have a bad unit. Until you metnioned that it happens while at rest, I was thinking perhaps it was transducer placement or simply running too fast. Since it is happening while the boat is at rest, that is a clear indication (to me) that the sonar section of the unit is bad.

As to why it could be doing this even after software updates, I compare it to reloading PC software on a bad hard drive - you're still going to have problems no matter how many times you reload or update the software.

I share your frustration that a unit in this price range and with its specifications, should not be having this issue.

BUT, while I paid a hefty price ($1,900) for my very capable Northstart 660, it did the same thing once and the sonar section of the unit had to be replaced.

erik selis posted 03-12-2008 10:28 AM ET (US)     Profile for erik selis  Send Email to erik selis     
Thanks for your replies John. I think he should take it back and get it replaced with a new one.


Post New Topic  Post Reply
Hop to:

Contact Us | RETURN to ContinuousWave Top Page

Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.