Sounder - Furuno NAVNET 1734C Operator's Manual

8.5.4 Sounder

Requires Network Sounder ETR-6/10N/30N.
If...
you selected a sounder
display with the DISP key
marks and characters
appear
the picture appears
picture sensitivity is too low
the depth indication is not
displayed
noise or interference shows
on the display
the water temperature graph
appears
Sounder troubleshooting
But...
picture does not appear
picture does not appear
zero line does not appear
—
—
—
data is wrong
8. MAINTENANCE, TROUBLESHOOTING
Then...
check that the network
sounder's signal cable is firmly
fastened.
Check that sounder source is
correct.
check that the network sounder
is plugged in. The LED on the
network sounder should flash
every second.
check for loosened transducer
connector.
the picture is shifted. Confirm
shift setting.
check gain setting, if using
manual operation.
marine life or air bubbles may
be clinging to transducer face.
bottom may be too soft to
return a suitable echo.
adjust gain and range to display
the bottom echo (in reddish
brown), if you are using the
manual sounder mode.
check to be sure the transducer
cable is not near ship's engine.
check the ground.
other video sounders of the
same frequency as yours may
be operating near you.
check that sensor cable is
tightly fastened.
8-5