6 7.4.4 sounder – Furuno 1763C User Manual
Page 224
7. MAINTENANCE, TROUBLESHOOTING
7-6
7.4.4 Sounder
Requires Network Sounder ETR-6/10N or ETR-30N.
Sounder troubleshooting
If… But…
Then…
If you selected a
sounder display with the
DISP key
no sounder display appears
!
check that the signal cable between the
network sounder and this equipment is
firmly fastened.
!
check that the network sounder is
plugged in. The LED of the network
sounder should flash every second.
!
Check that sounder source is correct.
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.
depth is not displayed
—
!
adjust gain to display the bottom echo (in
reddish brown on the color model), if
you are using the manual sounder
mode.
!
correctly display bottom echo on the
display, if you are using manual sounder
mode.
!
confirm that ETR is selected at DEPTH
SOURCE on GENERAL SETUP menu.
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.
water temperature graph
appears but wrong or no
readout
—
!
check that sensor cable is tightly
fastened.
!
confirm that ETR is selected at DEPTH
SOURCE on GENERAL SETUP menu.