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8. MAINTENANCE, TROUBLESHOOTING
8-4
8.7 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.
8.7.1 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.
8.7.2 Radar
GD-1920C 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.
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