Radar; Plotter - Furuno NAVNET 1734C Operator's Manual

8. MAINTENANCE, TROUBLESHOOTING

8.5.2 Radar

GD-1720C requires a network radar.
If...
you pressed the
POWER/BRILL key and the
RADAR TX soft key to show
the radar picture
marks, legends appear
the picture is not updated or
it freezes
tuning is adjusted
the range is changed
there is poor discrimination in
range
the true motion presentation
is not working properly
the range rings are not
displayed

8.5.3 Plotter

Requires a FURUNO BB GPS receiver.
If...
position is not fixed within
three minutes
position is wrong
the track is not plotted
the bearing is wrong
Loran C (or Decca) TDs do
not appear
Loran C (or Decca) TDs
are wrong
the ship's speed indication
is not zero after the ship is
stopped
8-4
Radar troubleshooting
But...
nothing appears on the
display
no echo appears
—
sensitivity is poor
radar picture does not
change
—
—
—
Plotter troubleshooting
• check that antenna connector is firmly fastened.
• check number of satellites received, on the GPS status display. (See
page 8-11.) There should be three or more.
• check that the correct geodetic chart system is selected, on the GPS
SENSOR SETTINGS menu.
• enter position offset, on the GPS SENSOR SETTINGS menu.
• track is not being plotted. ("H" icon appears at the top of the display.)
Press the TRACK HALT soft key on the TRACKS & MARKS CONTROL
menu to start plotting again.
• check that correct magnetic variation is entered, on the GENERAL
SETUP menu.
• check that LORAN C (or DECCA) is selected at TD DISPLAY on the
GENERAL SETUP menu. Also, check that proper Loran C (Decca) chains
codes are entered, on the TD SETUP menu.
• enter TD offset, on the TD SETUP menu.
• try to decrease speed/course smoothing, on the GPS SENSOR
SETTINGS menu.
Then...
• check that the antenna cable is firmly
fastened.
• check if radar source is correct.
• check that the antenna cable is firmly
fastened.
• check antenna cable.
• for freeze up, turn the display unit on and
off again.
• magnetron may need to be replaced.
Contact your dealer.
• try to hit the [+] and [-] keys again.
• turn the display unit off and on again.
• adjust A/C SEA.
• reselect true motion mode.
• check if heading and speed are input.
• hit the RADAR DISPLY and RINGS soft
keys to display them.
Then...