Echo sounder issues

[Misterbreeze]

I've fitted a new wind instrument display in a binnacle alongside existing nav displays, this involved disturbing all the cable runs. Now I find my elderly Silva echosounder doesn't show any data although the display itself seems ok. There was a particularly awkward part of the cable routeing where they all passed through small holes in tightly adjacent panels and I'm wondering if the scissor effect when one panel was lifted slightly has damaged the delicate data cable. Connections at each end look fine so is there a way of checking that output from the transducer is reaching the display? Or another way to determine if the fault lies with the transducer, cable or display?

 

[hurley]

Have you got an old spare transducer you could substitute just to test to eliminate that part of the system? In my experience usually any type or make seems to work OK.
Is the transducer still "clicking"? If it is then your probably right and its probably the coax.

This happened to me and it was a broken coax cable around a sliding hatch. I was able to find the break and splice it back together.

If internally mounted you could make sure there is still enough oil in the tube.

Failing that you may need to short the cable out with new coax. It should work but no guarantee. Nasa instruments say you must keep the length of cable the same the alternative is replacement.

 

[Concerto]

You could buy a cheap cable integrity tester kit, they start under £20. This will see if there is a fracture in the cable.