Furuno FM-4800, Operator'S Manual

Page: 89 / 135

MAINTENANCE AND TROUBLES
HOOTING
FM-4800 Operator’s Manual
80
Phenomena Probable Cause Solution
speaker cable is broken
or short-circuited.
Transmissions
are always on
low power even
when high power
is selected.
Antenna
Check the antenna or test the radio
with another antenna.
The icon or
appears on
the home screen.
Too high or too low
power supply
voltage Confirm that the connected power
supply voltage is within 10.8 to
15.6 VDC.
Your position is
not displayed.
Accessory cable
Check the NMEA2000 or
NMEA0183 cable connection.
Setting of the GNSS
receiver
Choose the proper information to
check:

If the NMEA2000 or
NMEA0183 cable is
connected, make sure that
the output of the cable is
valid.

If the NMEA2000 or
NMEA0183 cable is not
connected, make sure that
the internal GNSS module is
enabled and nothing blocks
the top of the radio unit.
The radio unit
displays "PLL
UNLOCK".
The phase lock loop
not working
Restart the radio. If the problem is
not fixed, please consult your
dealer.
Output power
reduced to low
Power is
automatically
reduced to protect
against overheating
due to continuous
transmission.
Wait until the unit cools.
If the above solutions cannot fix your problems, or you may have some other queries,
please contact us or your local dealer for more technical support.