15. MAINTENANCE, TROUBLESHOOTING
15-4
15.3 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.
15.3.1 General troubleshooting
15.3.2 Radar troubleshooting
Problem Remedy
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.
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.
For TZTBB: Picture is not dis-
played properly.
Turn off and on the power. If you do not get a proper picture, con-
tact your dealer for instructions.
For TZTBB: Nothing appears
on the screen after you press
the key.
• Check if the monitor is powered.
• Check if the monitor cable is connected.
Problem Remedy
Nothing appears on the screen
after you press the key and
select [Tx Radar] from the Ro-
toKey menu to transmit.
• Select [Tx Radar] from the RotoKey menu again.
• Check that the antenna cable is fastened.
• Check if the radar source is correct.
Marks and characters 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 power off and on.
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 zoom in or out the radar display.
• Turn the power off and on.
Poor discrimination in range. Adjust the sea control.
Range rings are not displayed. Select [Rings] from the RotoKey menu to activate the range rings.
You selected [Tx Radar] from
the RotoKey menu to transmit.
The "TX screen" appears, 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 TZT net-
work. Wait a few seconds then turn on all the equipment.
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