Furuno USA Inc 9ZWRTR104 ユーザーズマニュアル

14.  MAINTENANCE, TROUBLESHOOTING

You selected a fish finder dis-
play, but no picture appears.

•  Check that the transducer cable is fastened.
•  Check that the fish finder source is correct.
•  If you are using a network fish finder, check that it is properly 

connected.

Marks and characters appear, 
but no picture appears.

Check if the transducer cable is connected.

Picture appears but zero line 
does not appear.

•  The picture is shifted. Check the shift setting.
•  Check if draft is set to zero or higher.

The picture sensitivity is too 
low.

•  If you are in the manual mode, check the gain setting.
•  Check the transducer face for marine life or air bubbles.
•  Bottom is too soft to return an acceptable echo.

The depth indication does not 
appear.

•  For manual operation, adjust gain and range to display the bot-

tom echo (in reddish-brown).

•  Adjust bottom level HF/LF.

Noise or interference shows on 
the display.

•  Make sure the transducer cable is not near the engine.
•  Check the ground.
•  Check if another fish finder in the vicinity of your boat has the 

same frequency as your fish finder.

•  Try to reject the interference with [Interference Rejection] in the 

[Settings] - [Sounder] menu.