Furuno NAVNET 1823C - Manual (Page 224)

7. MAINTENANCE, TROUBLESHOOTING
7-6
7.7.4 Sounder
Requires Network Sounder ETR-6/10N/30N.
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 p
lugged in . The LED on the
network sounder should flash
every second.
marks and characters
appear picture does not appear
•
check for loosened transducer
connector.
the picture appears zero line does not appear
•
the picture is shifted. Confirm
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 (in reddish
brown), 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.