Question about Lowrance Lcx 27c 7" Gps Fish Finder Combo With Df Tm Transducer

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Transducer loses bottom at any type of speed greater than trolling. Worked fine last year with all the same setttings. All I can think of is , maybe the battery is low. The boat just came out of storage for the winter. The finder is a lcx 27c. Hope someone can help.Thanks Jay.

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Check the transducer for any damage on the front part. Also make sure there isn't any damage on the bottom of the boat that is causing air bubbles to cross the face of the transducer. If it works at slow speeds there is definitely something causing air bubbles.

Posted on Jun 14, 2010

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Posted on Jan 02, 2017

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What can i do to stop the flashing of the depth finder at times it will not show the current depth


Hey Joe,
Wow.. where to start.. there are so many things that will cause the issue you are describing.What type of electronics do you have? Does this happen at all speeds? Where is the transducer mounted? I need more info about when it stops reading.
1.Wrong setting on the unit
2 Bad transducer
3 Bad transducer mounting (either inside the hull or outside the hull.)
4. (In hull) Turbulence going under the boat (mine quits reading at about 55 mph @ half trim...the boat is lifting so much it causes air pockets so the transducer loses contact with the water)
5. (Outside hull) Turbulence around the bottom of the boat where the transducer meets the water.
Good luck,, when you get the info.. reply to me..

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My depth finder keeps loseing the bottom and just flickers the last reading


Hi, if this happens when stationery check the angle of the transducer, if it only happens when moving check the height of the transducer also. Regards Phil

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When at speed i tend to lose sight of the bottom it becomes very broken. Also the depth reading takes a while to record depth.


What you are experiencing sounds like air bubbles crossing the face of the transducer. If you have a transom mount transducer check the face of the transducer. Make sure that it is clean. Also make sure the front of the transducer is a tiny bit lower than the back. The digital readout on the screen will only happen when you have a strong signal of the bottom.

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You need to set the transducer lower. When at speed, the hull of the ship raises up out of the water and hence your transducer is probably not deep enough at these times to give a proper reading.

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I havew a Minn Kota trolling motor on a Z21 Ranger. Minn Kota has a built in (puck type) transducer on the motor. I have a lowrance 135x on the front. The lowrance will read the temp but will blink the depth. I switched out the depth finder with another 135x with the same results. I have a 522c gps unit networked together and mounted on the console that works fine. Any suggestions on the problem with the 135x?

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Did you ever get your problem fixed, I having the same issues.
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Had the same issue with another brand. Turned out the transducer cable was picking up noise from other cables (power, trolling mtr. etc). Try moving the transducer cable away from any other cables. I put the cable in a 1/4 " plastic housing up to the point where it was above deck and it stopped all the strange stuff. Not sure about the temp issue??

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Did the unit come with a strap to mount the transducer to a bow mount electric? Most units do... If not there is probably one available for the unit as an aftermarket accessory or accessory from the manufacturer... Regarding the transducer wire, just wrap and rout this up the front of the bow mount motor shaft so when you pull the motor up and secure it, it is not going to get in the way. You could cable tie the cord down near the bottom of the shaft and one up near the top where they wont interfere with the motor bracket when the motor is positioned up on the boat.

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1 Answer

False fish readings


False fish readings are commonly caused by electrical interference such as alternator noise, and by air bubbles flowing across transducer.

For starters make sure your fishfinder is on an independent circuit and not on one powered by your ignition switch. In other words, you should be able to turn your fishfinder on, even though the engine is turned off. Ideally the fishfinder should be wired directly to the battery with an in line fuse.

Try running the boat at a speed slightly higher than trolling speed, then kill the engine, as the boat slows down to trolling speed do you still see false echos? If yes then the problem probably lies with how the transducer is mounted, or where it is located on the hull.

If you don't see the false echos when the engine is off, it may be necessary to reroute the transducer cable to keep it away from the boat's ignition wires. You can get transducer extension cables if necessary. Also there are filters that you can buy that suppress alternator noise buy attaching between the battery and the engine.

Another common cause of false echos from electrical interference is a transducer cable that has been cut and spliced.

I hope this information helps. Please reply if you have any questions about my response.

Feb 25, 2008 | GPS

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