Faulty depth sounder

[mparrish]

I have a Lowrence 3500 depth sounder which has a mind of it's own as to working !! Works fine for a brief time, then just flashes or alarm sounds with no screen display. Have had the dead unit replaced, but no change. I think the problem might be related to a bad ground connection - but I'm no electrician !!. I can make it stop working by switching on other rocker switches, but I can't seem to isolate the problem so as that I can fix it. Anyone got any ideas ??

 

[chippie]

If you have an inline fuse for the existing power supply, check there is no corrosion on the connections.
If that doesnt help I would then try rigging up a separate temporary power supply to see if the issues are still there, shouldnt be too hard. Check all connections to transducer too.

 

[yobbo]

Check your earth connections, if you are turning on other equipment when iti s on and it is going off check that the voltage to the unit is not dropping below its minimum requirements to operate which is around 9 volts so running a temporary line will prove if this is an issue