Furuno TZT9 User Manual

15. MAINTENANCE, TROUBLESHOOTING
15-5
15.3.3 Chart plotter troubleshooting
15.3.4 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 ship is not
plotted.
Check that the track is turned on. Select the [Overlay] - [Tracks]
menu from the RotoKey menu.
Problem Remedy
You selected a fish finder dis-
play at the display selection
window, 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 or higher.
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.
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 adjust the interference rejection: Select the [Sounder] -
[Interference Rejection] menu of the main menu.

Furuno TZT9 Specifications

General

Brand	Furuno
Model	TZT9
Category	Monitor
Language	English