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09-11-2009, 08:47 PM | #1 |
Senior Member
Join Date: Jan 2009
Location: Rancho Cucamonga
Posts: 753
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Troubled fishfinder
Need some assistance: I have the Lowrance M68C Fish Finder/ GPS unit. Today, when fishing at 184 ft depth, the FF unit suddenly started flashing, the screen went clear, and the depth went from 184 ft to 5 ft. After that, nada, except when heading back into the harbor my depth gauge registered 225 ft when in fact we were in only 25ft of water.
I don’t know if it’s the transducer or the head unit has gone belly up? Anyone else out there ever experience anything similar? The unit is only 3 months old. |
09-11-2009, 09:50 PM | #2 |
bing!
Join Date: Mar 2007
Location: socal
Posts: 246
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Sometimes, FFs turn quirky when getting low or unstable voltages.
Check the voltage of battery at the terminals and then the connector ends. With an SLA, you should get a reading of about 12.7 volts. If you are getting less than 10v with no load, that battery needs charging, or may already be dead. If you get a good reading at the terminals, and a lower one at the connectors, the connectors are corroded. Sometimes, they can be polished up, other times, you need to change them. Next, put the battery in, but not the head unit. Check the voltage at the pins that go into the unit. You should get a reading that is equal to what it is directly at the battery terminals. If not, there is something wrong along the power lines. Its either corroded connectors, corroded or bad fuse contacts or black wire disease (blackening of the wire due to saltwater shorting). Check the voltage at different points along the power line too. Particularly after each connection point (butts, connectors, jumper). If you have to, cut lightly into the wires so you can insert a DVM probe. Tape the cut close when finished. If power problems are ruled out, send the head and tx unit in. Its under warranty, so its better that the company check it out. I just solved a long standing problem with my ff. It likes to turn off on the water or sometimes not turn on at all. Found out that a perfectly good looking connector develops enough resistance to drop my voltage from 12 volts at the battery, to 6-7 volts at the pins. Change the connector, and she ran fine. /bing Last edited by peguinpower; 09-12-2009 at 09:19 AM. |
09-26-2009, 11:25 AM | #3 | |
Senior Member
Join Date: Apr 2005
Posts: 286
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Quote:
If your electrical checks out, try re-mounting the transducer. You may have an air bubble or a gap in the silicone. |
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09-26-2009, 12:31 PM | #4 | |
Administrator
Join Date: Mar 2005
Location: 1-2 miles off the point
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Quote:
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09-27-2009, 03:36 AM | #5 |
Senior Member
Join Date: Jan 2009
Location: Rancho Cucamonga
Posts: 753
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Thanks Andy. I set it back to the factory spec's on Friday and went out fishing yesterday. It seemed to be ok. A couple times the depth finder went a little haywire with incorrect depth readings when I passed the 200 ft depth. And only once did the unit powered off. But at least the screen did not clear! Thanks again. Roger
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09-27-2009, 08:51 AM | #6 |
Senior Member
Join Date: May 2008
Location: costa mesa
Posts: 124
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Roger, you don't need fishfinder if you are fish magnet
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09-25-2009, 06:42 PM | #7 | |
Junior
Join Date: Sep 2009
Posts: 12
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