Furuno FM-4000 - Manual (Page 75)

Page 75 FM-4000
SYMPTOM
Cannot power the
transceiver.
Transceiver blows fuse
when connected to
power supply.
Popping or whining
noise from the speaker
while engine runs.
Sound is not emitted
from the internal or ex-
ternal speaker.
Sound is not emitted
from the PA speaker.
Receiving station re-
ports low TX power,
even with transceiver
set to HI power.
“HI BATTERY” or “LO
BATTERY” appears
when the power is
turned on.
“PA ERROR” or “FOG
ERROR” is shown
when the PA/FOG
mode is activated.
Your position is not dis-
played.
While in PA or Fog lis-
ten-back modes, AM
broadcasts can be
heard.
PROBABLE CAUSE
No DC voltage to the
transceiver, or blown
fuse.
Reversed power
wires.
Engine noise.
Accessory cable.
Accessory cable.
Antenna.
The power supply
voltage is too high or
too low.
Accessory cable.
Accessory cable.
Setting at the GPS
receiver.
Strong AM radio sta-
t i o n s a r e b e i n g
pickup up by the
speaker wires.
REMEDY
a. Check the battery connections and the fuse.
b. The PWR switch needs to be pressed and
held to turn the radio on.
Check the power cable for DC voltage. Check
the fuse (6A 250V).
Make sure the red wire is connected to the posi-
tive (+) battery post, and the black wire is con-
nected to the negative (-) battery post. If the fuse
blows after replacement, contact your dealer for
advice.
Reroute the DC power cables away from the
engine. Add noise suppressor on the power
cable. Change to resistive spark plug wires and/
or add an alternator whine filter.
Check if the accessory cable is firmly fastened.
(Short circuit the external speaker cable WHITE/
SHIELD).
Check if the accessory cable is firmly fastened.
(Short circuit the PA speaker cable RED/
SHIELD).
Have the antenna checked or test the trans-
ceiver with another antenna. If the problem per-
sists, contact your dealer for advice.
Confirm that the connected power supply volt-
age is not over 17 volts or lower than 10 volts.
Check if the accessory cable is firmly fastened.
(Short circuit the PA speaker cable RED/
SHIELD).
Check if the accessory cable is firmly fastened.
Some GPS receivers use the battery ground line
for NMEA connection.
Check the output signal format of the GPS re-
ceiver. This radio requires NMEA0183 format
with GLL, RMB, or RMC sentence as an output
signal. If the GPS receiver has a facility for set-
ting baud rate and parity, select “4800” and
“NONE,” respectively.
Replace the speaker wires to a sheilded 2-con-
ductor wire. See section “8.5 ACCESSORY
CABLE” for cable connections.
14.1 TROUBLESHOOTING CHART