Furuno 1734C 服务手册

8. MAINTENANCE, TROUBLESHOOTING 

Requires Network Sounder ETR-6/10N/30N. 

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 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.