Furuno NAVNET 1833 - Manual (Page 215)

7. MAINTENANCE, TROUBLESHOOTING
7-3
7.5 Simple Troubleshooting
This section provides simple troubleshooting procedures which the user can
follow to restore normal operation. If you cannot restore normal operation do not
attempt to check inside the unit. Any trouble should be referred to a qualified
technician.
7.5.1 General
General troubleshooting
If… Then…
you cannot turn on the
power • check for blown fuse.
• check that the power connector is firmly fastened.
• check for corrosion on the power cable connector.
• check for damaged power cable.
• check battery for proper voltage output (10.8 to 31.2 V).
there is no response
when a key is pressed • turn off and on the power. If there still is no response the key may
be faulty. Request service.
7.5.2 Radar
Requires a network radar.
Radar troubleshooting
If… But… Then…
you pressed the
[POWER/BRILL] key
and the RADAR TX
soft key to show the
radar picture nothing appears on the display • check that the antenna cable is
firmly fastened.
• check if radar source is correct.
marks, legends
appear no echo appears • check Tx fuse in the power cable.
If it is blown, replace it.
the picture is not
updated or it freezes — • check antenna cable.
• for freeze up, turn the display unit
off and on again.
tuning is adjusted sensitivity is poor • magnetron may need to be
replaced. Contact your dealer.
the range is changed radar picture does not change • try to hit the [+] and [-] keys again.
• turn off and on the display unit.
there is poor
discrimination in range — • adjust A/C SEA.
the true motion
presentation is not
working properly — • reselect true motion mode.
• check if heading and speed are
input.
the range rings are
not displayed — • hit the RADAR DISPLY and
RINGS soft keys to display them.