I had the same problem last time I was out in shallow water (in less than 2 metres of water) and I suspect that the problem was weed wrapped around the transducer but won't know for sure until I take it out on the water again. I had another problem re water temp which I'll enter separately.
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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.
I own a 1995 Four Winns and what you need is a Lowrance LSM-1 depth
finder unit. It accepts the two pin lead from the transducer and send
the depth reading to the dashboard display via the 6-pin connector.
There is also a three wire harness (red/blk/wht) that connects to a
The reason I know all this is my depth finder
fried a couple years ago so I removed the Lowrance LSM-1 from the boat
in order to find a replacement. Unfortunately, this was an OEM part
that is not available from Four Winns or any aftermarket source.
Probably your best bet is to look in a boat salvage yard or purchase an
aftermarket depth finder.
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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Go to sensitivity set to manual then go up one on the menu
and set it to 95 – 97 this will clear up the rapid change now set zoom to
manual. Your back and running.
I installed my Navman 4150 depth finder along with the Navman GPS unit when I purchased my Bayliner Trophy 20Ft. Offshore model. Everything was ok for one year and it has been downhill since then. Losing signal, unbelievable high depth ranges, blank periods, etc.. I now can't even get a reading tieded up at the dock. I am now giving up and shoping for a quality unit.. Cape Disappointment.........
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.