Furuno FM-4800 User Manual

92
14.2 Troubleshooting
When the FM-4800 does not work properly, you can follow the following
troubleshooting procedures to fix it.
Phenomena
Probable
Cause
Solution
The radio cannot
be turned on.
No DC voltage
to the radio, or
blown fuse
Step 1 Check the 10.8 to 15.6 VDC
battery connections and the
fuse.
Step 2 Long press the On/Off key to
turn on the radio.
The radio blows
the fuse when
connected to the
power supply.
Reversed
polarity of
power wires
Step 1 Make sure the red wire is
connected to the positive (+)
battery post, and the black
wire is connected to the
negative (-) battery post.
Step 2 Check the power cable for DC
voltage and replace the fuse
(8A 250V).
The speaker
makes popping
or whining noise
while t
he engine
of the ship runs.
Engine noise
Step 1 Reroute the DC power cable of
the radio away from the
engine.
Step 2 Add a noise suppressor on the
power cable.
Step 3 Change to resistive spark plug
wires and/or add an alternator
whine filter.
The sound is not
emitted from the
internal or
external speaker.
Accessory
cable
Step 1 Check that the external
speaker cable (Purple &
Gray) is physically connected.
Step 2 Check whether the external
speaker cable is broken or
short-circuited.
The sound is not
emitted from the
speaker.
Accessory
cable
Step 1 Check that the cable (Red &
Black) is physically
connected.
Step 2 Check whether the speaker
cable is broken or
short-circuited.
Transmissions
are always on
low
power even
when high power
Antenna
Check the antenna or test the radio with
another antenna.

Furuno FM-4800 Specifications

General

Brand	Furuno
Model	FM-4800
Category	Cordless Telephone
Language	English