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8. MAINTENANCE, TROUBLESHOOTING
8-4
8.5.2 Radar
GD-1720C requires a network radar.
Radar troubleshooting
If… ButThen…
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 that the antenna cable
is firmly fastened.
the picture is not updated or
it freezes
check antenna cable.
for freeze up, turn the display
unit on and off 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 the display unit off and on
again.
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.
8.5.3 Plotter
Requires GPS Receiver GP-310B/320B.
Plotter troubleshooting
If… Then…
position is not fixed within
three minutes
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.
position is wrong
check that the correct geodetic chart system is selected, on the GPS
SENSOR SETTINGS menu.
enter position offset, on the GPS SENSOR SETTINGS menu.
the track is not plotted
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.
the bearing is wrong
check that correct magnetic variation is entered, on the GENERAL
SETUP menu.
Loran C (or Decca) TDs do
not appear
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.
Loran C (or Decca) TDs
are wrong
enter TD offset, on the TD SETUP menu.
the ship’s speed indication
is not zero after the ship is
stopped
try to decrease speed/course smoothing, on the GPS SENSOR
SETTINGS menu.
207


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