Lowrance X136df Fishfinder With Dual Frequency Transducer Logo

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Posted on Nov 30, 2017
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Lowrance X-136DF Fishfinder Not working

Not getting a good bottom reading. Depth flashing. Then at times in shallow water (say 5-15ft) it works fine, but will eventually start flashing and not working. I plugged a friends sonar unit (good working condition in his boat) in to compare, and his did not work either. So I think it's the transducer? What should I do?

2 Answers

Dariusz Zalewski

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  • Master 1,095 Answers
  • Posted on Dec 02, 2017
Dariusz Zalewski
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Transducer can be broken and hanging loose on wire or could face not directly toward bottom. Other possibility it too much growth on transducer and in worst case scenario unit is going bad.

Gordon Richard MacLean

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  • Expert 253 Answers
  • Posted on Dec 02, 2017
Gordon Richard MacLean
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Hello Keneth,
Is The transducer In Side the Hull Or Mounted On The Transom?
If Inside Remove It And Re Fit It Using Epoxy Glue Ensuring No Air Pocket Between transducer And Hull.
If transom Mounted Replace Transducer.
Hope this Helps
Gordy

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5 Related Answers

Anonymous

  • 3 Answers
  • Posted on Jul 16, 2009

SOURCE: it shows the correct depth and then intermittently

I have this problem as well! Mine is on the LMS 332C

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Anonymous

  • 1 Answer
  • Posted on Jul 21, 2009

SOURCE: lowrance x135 not functioning properly

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??

Editor925

Dean

  • 285 Answers
  • Posted on Aug 01, 2009

SOURCE: My Lowrance X-51 is not reading the depth sitting

Yes quite possibly... But a few things to try/check first before you go out and get a new transducer...

1. Ensure the transducer is fully submersed below the waterline when floating and when on the plane... try lowering it more if you can.
2. Check the surface of the transducer itself (the underside) pointing down... If there are any minor scratches or scuffs, this can effect its function or performance. Minor scratches or marks can be sanded out with fine wet/dry sandpaper (at least 400 or 800 grit).
3. Isolate any electrical wires running near or next to the transducer cable. Also check connection of cable at head unit, and that the pins etc are clean, free of corrosion and making good contact.
4. Take your head unit to your Lowrance dealer and they may have a transducer there to use to diagnose whether it is indeed the trasnducer or a problem with the head unit.

Good luck!

Anonymous

  • 15 Answers
  • Posted on Sep 05, 2009

SOURCE: sonar inop at most times . onec in a while it works fine

(1) bad transducer. (2) bad ground from unit to battery. The cable next to the battery will have no effect.

fishdoctorfi

Shannon Currie

  • 178 Answers
  • Posted on Dec 27, 2009

SOURCE: Can I use my existing transducer(1000 watt tilted

As long as the connection is the same.....maybe. The difference will be the angle of beam from boat to bottom. May not cover the same area...or you could loose zoom etc. something will be different.

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Sounds like you do not have your transducer connected.
You will know it is working if you have a bottom sounding. If you have a bottom sounding (depth reading) and it is correct then you may have to fine tune the finder to see the fish.
I have the same finder on my boat. http://njsaltfish.com/index.php/captainsfocus?sid=61
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Pay attention if depth readings shift during times when moving from spot to spot at higher speeds. If this is the case then you have air bubbles disrupting your sonar signal causing inaccurate readings or a loss of bottom lock for the unit. If over this weeds in shallow water, this at times creates havoc with sonar readings because of the wide variance of signal returns.
check the voltage at the head unit.You should have a minimum of 11.7 volts. 12.5 to 13.5 is optimal
lower power input can affect the overall performance of your unit.
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Water depth should show automatically on your sonar page.
if it does not then either you have selected "stop sonar" under your sonar options or you have opted to turn off the depth displayou so the numbers don't show up.
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either that or you got some funky wiring issue lol
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https://www.lowrance.com/Root/Lowrance-Documents/US/ELITE-5-7_HDI_OM_EN_988-10647-001_w.pdf
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My fishfinder will not continue to read shallow depths as well as in shallow depths when drifting and occasionally running across the water. My unit is a lowrance 522c color gps/fishfinder.

Hello. Your observation is spot on and it is actually a characteristic that is always true when using sonar. Yes, your Lowrance uses the same sonar as a nuclear powered submarine does. The two factors you focus on, water depth and boat speed are perhaps, the two biggest factors when it comes to the quality of the fishfinder. The boat's engine should be in gear at an idle or just above. Experiment with your boat to find the best throttle location for good arches. Usually, a slow trolling speed works best. The depth of the fish can determine if the fish will arch on the screen. If the fish is in shallow water, the fish is not in the cone angle very long, making it difficult to show an arch. Typically, the deeper the fish, the easier it is to show an arch.
If you would like a complete tutorial on Lowrance sonar, go to this link. Enjoy. http://www.lowrance.com/Support/Tips-and-Tutorials/Sonar-Tutorial/
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X510c most of the time it reads 1.6 for the depth, it flashes 1.6 then it will go to the correct depth for a shqrt time then get stuck on 1.6 again some times other depths but mostly 1.6

Does this occur at any depths...over 20ft even.

The X510c will have problems keeping depth in shallow water...especially if it is muddy, weedy down there.

If the problem occurs even in depth over 20ft, then try resetting the unit:

1. Turn unit off
2. Press and hold ZIN, ZOUT, and PWR until you see the depth (flashing or not) in the top left corner.

If the problem still occurs, make sure the transducer is clean and still mounted so that it is sending the signal straight down to the bottom.

If the problem still occurs, make sure the power is good. You can have the voltage displayed on the screen through the overlay data menu.

Does the problem occur at any speed? If the problem clears up when you stop or slow down, the problem is due to cavitation and the transducer will need to be moved to a location where it is in a smooth flow of water at all speeds.

If none of this helps, there may be a malfunction with the X510c. You can try to update it but you will need to get the software update from someone at Lowrance support and then find a way to connect your X510c to a Lowrance unit that has a memory card slot via a NMEA 2000 network. I can help you with this if you need.

Other than that you can have the X510c returned to the factory for service.
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Your transducer needs to be adjusted so the return signal can be picked up. Some of these have to be super tuned to receive the signal. Also the transducer may be moving ever so slightly when the boat is traveling at speed. You may have some water turbulence interference all contibute to signal return.
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