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7. MAINTENANCE, TROUBLESHOOTING
7-6
7.4.4 Sounder
Requires Network Sounder ETR-6/10N.
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.
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.