Furuno FM-2710 - Manual (Page 35)

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6. Troubleshooting
Minor Troubleshooting
Most of VHF troubles are caused not by the transceiver itself but by the ANT/feeder or power supply
system. The list below provides simple troubleshooting that can be done by the operator. DO NOT
ATTEMPT TO CHECK INSIDE THE TRANSCEIVER. CARELESS HANDLING MAY CAUSE
PERMANENT DAMAGE TO THE TRANSCEIVER.
Symptom Possible Cause Remedy
Power is off at mains switchboard. Turn mains switch on.
Power lead is loose or disconnect.
Secure connector firmly and check
connections to battery.
Mains battery is flat.
Check battery liquid, charging
system, etc.
Volume control turned
clockwise but power
does not come on.
Fuse has blown.
Check mains voltage and polarity
and then replace fuse (10A).
SQUELCH setting is too high.
(Turned too far clockwise.)
LCD looks
normal but no sound.
VOLUME setting is too low.
To confirm audio output, turn
SQUELCH fully CCW and turn
VOLUME slowly CW.