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8. MAINTENANCE, TROUBLESHOOTING
8-6
8.7.4 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
sounders signal cable is firmly
fastened.
Check that sounder source is
correct.
check that the network
sounder is plugged 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.
205


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