Chart Plotter Troubleshooting; Fish Finder Troubleshooting - Furuno MFD12 Operator's Manual

14. Maintenance, Troubleshooting
14.4.3

Chart Plotter Troubleshooting

Problem
Position is not fixed.
The track of your vessel is not
plotted.
14.4.4

Fish Finder Troubleshooting

Problem
You selected a fish finder
display with the DISP key, but
no picture appears.
Marks and characters appear,
but no picture appears.
Picture appears but zero line
does not appear.
The picture sensitivity is too
low.
The depth indication does not
appear.
Noise or interference shows on
the display.
The water temperature graph
appears, but the data is incor-
rect.
14-4
Check that antenna connector is fastened and navigator is cor-
rectly connected.
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.)
• 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.
Check that the transducer cable is connected.
• The picture is shifted. Check the shift setting.
• Check if draft is set to zero (Menu→System→Calibration).
• 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.
• 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).
• 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).
Check that sensor cable is fastened.
Remedy
Remedy