Re: B&G Sonic Speed failure
The output is a square wave: 6,25 Hz per Knot boat speed so
please measure in Hz.
The AGC pin is marked on the board, measure DC with respect to the ground pin.
I expect your electronic board is still OK => missing rubber
cap will most likely be the cause: the hole where the cap was
fills up quickly with dirt and that stops the sensor "hearing" the
sound waves emitted by the other sensor, even if its resistance
still measures "good" ( its just a resistor of 100 kilo-ohm
soldered over the crystal)
You say the boat is on the hard now so you can clean and then
fill the hole with silicone or neoprene ( with or without the
rubber cap). Then test with a tube filled with water between the
But when you are out on the hard anyhow this is the moment to order and replace Maxmarine electronics still has them.
Of cause you are very welcome in Newry to test your board.
Hope this helps you,
sv Malaka Queen
SM2k #348 @Newry, Northern Ireland
Op 11-10-2021 om 12:37 schreef David Crisp:
Thanks for the advice Stefan.