Furuno MFD12 - Chart Plotter Troubleshooting; Fish Finder Troubleshooting

14. Maintenance, Troubleshooting
14-4
14.4.3 Chart Plotter Troubleshooting
14.4.4 Fish Finder Troubleshooting
Problem Remedy
Position is not fixed. Check that antenna connector is fastened and navigator is cor-
rectly connected.
The track of your vessel is not
plotted.
Check that the track is turned on. (Put the cursor on the boat icon
to open the pop-up menu and check that "Tracks" is on.)
Problem Remedy
You selected a fish finder
display with the DISP key, but
no picture appears.
• Check that the signal cable for the fish finder is fastened.
• Check that the fish finder source is correct.
• Check that the network fish finder is properly connected.
Marks and characters appear,
but no picture appears.
Check that 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 (Menu→System→Calibration).
The picture sensitivity is too
low.
• Check the gain setting in manual operation.
• The marine life or air bubbles can attach to the transducer face.
• 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 (Menu→System→DFF(ETR).
Noise or interference shows on
the display.
• Make sure the transducer cable is not near the engine of the
bat.
• Check the ground.
• There can be another fish finder on another that has the same
frequency as your fish finder.
• Try to adjust the interference rejector (Menu→Fish Finder→
DFF/FCV(ETR)→Interference Rejector).
The water temperature graph
appears, but the data is incor-
rect.
Check that sensor cable is fastened.