Furuno NAVNET 1833 - Manual (Page 217)

7. MAINTENANCE, TROUBLESHOOTING
7-5
7.5.4 Sounder
Requires Network Sounder ETR-6/10N.
Sounder troubleshooting
If… But… Then…
you selected a
sounder display with
the DISP key picture does not appear • 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 of the
network sounder should flash
every second.
marks and
characters appear picture does not appear • check for loosened transducer
connector.
picture appears zero line does not appear • the picture is shifted. Confirm the
shift setting.
picture sensitivity is
too low — • 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.
the depth indication
is not displayed — • adjust gain and range to display
the bottom echo, if you are using
the manual sounder mode.
noise or interference
shows on the display — • 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.
the water
temperature graph
appears data is wrong • check that sensor cable is tightly
fastened.