Furuno MFD8 Guía Del Usuario

14.  Maintenance, Troubleshooting

This section provides simple troubleshooting procedures which the user can follow to 
restore normal operation. If you cannot restore normal operation, do not check inside 
the unit. Have a qualified technician check the equipment.

You can not turn on the power.

•  Check for blown fuse.
•  Check that the power connector is fastened.
•  Check for corrosion on the power cable connector.
•  Check for damaged power cable.
•  Check battery for correct voltage output (10.8 to 31.2 V).

There is no response when a 
key is pressed.

Turn off and on the power. If you do not get a response, the key is 
damaged. Contact your dealer for instructions.

The message "HDD warning. 
Please contact a dealer." ap-
pears at start up.

The hard disk has been used 18,000 hours. See your dealer for 
details.

Nothing appears on the display 
after you press the power 
switch followed by the GAIN/TX 
key to transmit.

•  Make sure to push the key for more than one second.
•  Check that the antenna cable is fastened.
•  Check if the radar source is correct.

Marks and legends appear, but 
echoes do not appear.

Check that the antenna cable is fastened.

Picture is not updated or the 
picture freezes.

•  Check antenna cable.
•  If the picture freezes, turn the display unit on and off.

You tuned the receiver, but the 
sensitivity is weak.

Have a technician check the magnetron.

You changed the range, but the 
radar picture does not change.

•  Try to hit the RANGE keys again.
•  Turn the display unit off and on.

Poor discrimination in range.

Adjust the Sea control.

True motion mode is not operat-
ing correctly.

•  Select the true motion mode.
•  Check if the heading and speed are input.

Range rings are not displayed.

Use the Rings soft control to activate the range rings.

You pressed the GAIN/TX key 
to transmit. The "TX screen" ap-
pears, but the radar goes into 
stand-by.

This problem indicates that the overload protection has activated. 
To restore normal operation, turn off all equipment in the NavNet 
network. Wait a few seconds then turn on all equipment.