Signet Depth guage..

groundhog · #1 (**permalink**) 04-29-2009

I have an older MK172 Signet, which I believe is 70s vintage. It's those round LCD meters, about 5 1/2 inches in diameter.

Well, the thing works, sometimes. Saturday, I was working on my boat, I left it on, thinking it was a heat issue. The thing ran fine for about an hour.

But if i run the engine? It quickly gets confused. Maybe it's when the boat is moving. I don't know.

Anybody have experiences?

These things are so damn expensive. I already paid $70 for an LCD display and some other really expensive stuff.

Maybe change out all the electrolytic caps?

Help!

sailingdog · #2 (**permalink**) 04-29-2009

It could also be electronic noise, which might be solved by the addition of ferrite cores.

It could be due to voltage variations caused by the alternator... have you checked the voltage output of the alternator???

groundhog · #3 (**permalink**) 04-29-2009

You know, when I think about it, it's probably not electrical noise.
The thing is always getting confused, even when sailing...

But....(here I go again..)
It still could be noise. Microprocessor noise. Very low freq ocean noise, or underwater prop noise.

So maybe changing the caps might still work.

HOw often do the transducers on these depth guages go bad?

gh