Sounder - Furuno NAVNET 1722 Operator's Manual

7. MAINTENANCE, TROUBLESHOOTING
7.4.4

Sounder

Requires Network Sounder ETR-6/10N or ETR-30N.
If...
If you selected a
sounder display with the
DISP key
marks and characters
appear
picture appears
picture sensitivity is too
low
depth is not displayed
noise or interference
shows on the display
water temperature graph
appears but wrong or no
readout
7-6
Sounder troubleshooting
But...
no sounder display appears
picture does not appear
zero line does not appear
—
—
—
—
Then...
! 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.
! check for loosened transducer connector.
! the picture is shifted. confirm the 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 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.
! 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.
!confirm that ETR is selected at DEPTH
SOURCE on GENERAL SETUP menu.