Simple Troubleshooting; General; Radar - Furuno NAVNET 1824C Operator's Manual

8. MAINTENANCE, TROUBLESHOOTING
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

If...
you cannot turn on the
power
there is no response
when a key is pressed

8.7.2 Radar

GD-1920C 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
8-4
General troubleshooting
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).
turn off and on the power. If there still is no response the key may
be faulty. Request service.
Radar troubleshooting
But...
nothing appears on the
display
no echo appears
—
sensitivity is poor
radar picture does not
change
—
—
—
Then...
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.