Question about Furuno Ls4100 5" Mono Lcd Fishfinder Temp And Depth

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Furuno 4100 depth sounder shows depth twice what it really is

This depth sounder will indicate a depth that is twice as deep then it really is

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Check your gain setting try auto gain and try manually gaining back to see if it resolves, if yes, send unit in to furuno, if no, ducer is probably at fault.

Posted on Jan 16, 2010

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1 Answer

Bottom machine signal is slow and weak


Slow, not sure, weak al;lmost for sure it is the tarnsducer.
Buy a new one and hang over side of boat in deep water to test.
John 847-746-0100

Jan 30, 2013 | Furuno DFF1 Digital Network Sounder for...

1 Answer

When we are deep water (500 ft or deeper) the fish finder will display 3.5-10 ft. and won't show the fish or shows tons of fish. Are we able to set the depth that we would like to see eg: if we are...


Im not familiar with your particular unit but you should be using a low frequency transducer for water over 500'; something like a 50 kHz transducer or a dual frequency transducer like a 50/200kHz for detail with the high freq. but increased depth range on the lower frequency. As far as setting it to 250 ft, you should be able to use the range feature and adjust the maximum to 250'. typically the factory default is automatic so it will caonstantly adjust the range based on the maximum current depth.

May 22, 2011 | Standard Horizon Standard Ff520 Fish...

1 Answer

My Garmin 498C will not show the contore of the bottom or give me a depth reading. The GPS works and will show me charts but, not the sounder option though.


You need to check to see if the depth sounder transducer is connected or functioning. It might be turned off, the connectors may be bad or the transducer is bad. I don't have the 498 manual in front of me but I think there is a test function under the setup menu. I'd check my connections (the usual suspect) then run that.

Garmin tech support is pretty good/quick. So don;t be afraid to give them a call.

Aug 29, 2010 | Garmin GPSMAP 498C Sounder GPS Receiver

1 Answer

When I turn on the unit it will not read the depth only a blue screen and it will not let me switch out of auto mode or run the sounder test?


I know this is an old question but just ran across it. The 1833C/NT is a radar and chart plotter. It requires the external and optional black box sounder to have depth recorder functionality.

Oct 03, 2009 | Furuno 1833C/NT GPS Receiver

1 Answer

Furuno Colour Video Sounder FCV-68 tech diag need.


most are available from furuno, but not FCV 68 are you sure that is the model #?

Apr 11, 2009 | Furuno 1623 Radar 16nm Range

2 Answers

Unit showing 88.8 in the LCD window.


Hello geld1. Your problem is the transducer, cable or connector. Check transducer with an ohm meter, flex the cable while ohming the restance shouldn't change. The location and mounting of the transducer could be the main problem. Use the the correct gel film including a secure postion support.

Sep 22, 2008 | Uniden Qt206 Thru Hull, Digital Depth...

1 Answer

Faria Depth finder


I've found this manuals in Faria's site:

Depth sounder:
http://faria-instruments.com/site_manuals/IS0091F.pdf

Bombardier Depth Sounder:
http://faria-instruments.com/site_manuals/IS0138_C_digital_depth_sounder_owners_manual.pdf

Depth Sounder, Flushmount:
http://faria-instruments.com/site_manuals/IS0141c.pdf

Depth Sounder, Flush Mounted, Remotely Switched:
http://faria-instruments.com/site_manuals/IS0229_A_Digital_depth_sounder.pdf

there are also other useful manuals in the bottom of the page:
http://www.faria-instruments.com/downloads.php

Jul 14, 2008 | Faria Boating

1 Answer

I have a furuno fcv 585 echo sounder with a FURUNO CA50/200-12M -c13298 BRONZE THRU HULL HIGH PERFORMANCE TRANSDUCER. The transducer has 4 wires and it looks from the schematic that it attaches via a...


you need an MB1100 matching box has the 10 pin pigtail for your sounder and accepts bare wire input from your ducer
this will also ensure that all power from sonar get to ducer, but it from me if you like 847-746-0100

Jul 09, 2008 | Furuno FCV-582L GPS Receiver

1 Answer

Depth sounder problem


If the transducer is mounted off of level, an error is introduced due to angle. It is a fixed percent offset, say 10%. so 10 feet reads 11 and 100 reads 110. There is an offset function to read depth below ducer, depth below keel, and depth below waterline, but these are fixed amounts in feet, not a percentage. Look at the transducer when it is operating, boat angle considered.

Jun 18, 2008 | Furuno GP1650DF GPS Receiver

1 Answer

Navman 4150 fishfinder


Depth: Could be for a number of reasons, too deep for the sounder - check the manual for it's max depth. Dirty water, sounder unable to penetrate through to the bottom. Weed or other debris covering the transducer. Transducer on a swing mount & being pushed out of alignment then dropping back in once stopped.

Speed: Is the speed readout controlled by a GPS or paddlewheel? If it's GPS, check the power connection of the sounder, may be loose which would also cause the depth to 'drop out'. If it's paddlewheel, you're down to bad connections or faulty unit.

Oct 16, 2007 | Navman Fish 4150sx GPS Receiver

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