Northstar
Explorer 557/567
Installation and Operation Manual
72
1-1 The 557/567 won’t turn on:
a
The 557/567 is designed to operate on a
12/24 volt battery system, where the voltage
may vary from 10.5 to 32 volts. If an excessive
voltage is supplied, a fuse will be tripped,
turning the display unit off. Check the fuse.
b Check that the power cable connector at the
back of the display unit is securely plugged
in and the collar is locked in place. The collar
must be secure for watertight connection.
c
Measure the battery voltage while the battery
is under load - turn on some lights, radio or
other electrical equipment connected to the
battery. If the voltage is less than 10 volts:
-
the battery terminals or wiring on the
terminals may be corroded.
-
the battery may not be charging
correctly or may need replacing.
d Inspect the power cable from end to end for
damage such as cuts, breaks, squashed or
trapped sections.
e
Ensure that the red wire is connected to the
positive battery terminal and the black wire
to the negative battery terminal. If wired for
the Auto Power option, ensure the yellow
wire is connected to the ignition circuit. Also
check the boat’s main switch circuit (see
section 16-4).
f
Check for corrosion on the power cable
connector and clean or replace if required.
g Check fuses that are placed in line with the
power cable. A fuse can be blown despite
appearing to be good or the fuse may be
corroded. Test the fuse or replace it with a
fuse known to be good.
1-2 The 557/567 won’t turn off:
The 557/567 may have been wired for Auto
power. In this case, the 557/567 cannot be
turned off while the ignition power is on (see
section 2-3).
1-3 If the 557/567 beeps when turned on but
nothing is displayed:
The 557/567 may be operating, but the
backlight settings may have been set too low
(see section 2-4).
1-4 The wrong language is displayed:
See section 15-1.
B-1 General Problems
2-1 No GPS fix or long time to get fix at
startup:
a
May occur occasionally if the antenna does
not have a clear view of the sky. The satellite
positions are constantly changing.
b Antenna cable not connected to display unit.
c
Restart the GPS (see section 15-3).
2-2 557/567 GPS position different from true
position by more than 10 m (33 ft):
a
557/567 in simulate mode. Turn simulate
mode off (see section 15-12).
b The normal error in GPS position will exceed
10 m (33 ft) for about 5% of the time.
c
Under special circumstances the US
Department of Defence may introduce a
deliberate and changing error in the GPS
positions of up to 300 m (1000 ft).
2-3 557/567 position different from same
position on local charts:
a
557/567 in simulate mode. Turn simulate
mode off (see section 15-12).
b Incorrect chart datum. Select the correct
chart datum (see section 15-2).
c
Map shift has been applied wrongly. Clear map
shift, then reapply if necessary (see section 15-2).
2-4 Can not see boat on chart:
a Press
to switch to centre on boat
mode (see section 3-2-1).
2-5 The time or date on the satellite windows
wrong or off:
a
No GPS fix.
b In simulate mode. Turn simulate mode off
(see section 15-12).
c
Local time offset is wrong (see section 15-11).
The Local Time Offset must be changed
when daylight saving time starts or ends.
B-2 GPS navigation problems
