Furuno FS-1575 FS-2575 FS-5075 User Manual

11.  MAINTENANCE & TROUBLESHOOTING

The table below provides possible problems and the means with which to restore nor-
mal operation. If normal operation cannot be restored, do not attempt to check inside 
the equipment. Any servicing should be referred to a qualified technician.

The table below shows error messages, their meanings, and remedies. To delete the 
messages, press the CANCEL key. If other error occurs, contact your dealer.

Power cannot be 
turned on.

•  Mains switchboard is off.
•  (DC) voltage is too high.
•  Battery has discharged, or poor 

contact at terminals.

•  Turn on the mains switchboard.
• Check supply voltage.
•  Recharge the battery and tighten 

the battery terminals.

Display indications do 
not appear.

Display brilliance is too low.

Press the BRILL key to adjust the 
display brilliance.

Power is on but no 
sound from the main 
speaker.

Main speaker is off.

Press the   key to turn on the main 
speaker.

Poor articulation

Wrong class of emission.

Class of emission should match that 
of incoming signal.

Output power re-
duced to LOW

Power is automatically reduced to 
protect against overheating due to 
continuous transmission.

Wait until the unit cools.

Antenna coupler can-
not tune antenna

•  Antenna is disconnected or short-

ed to ground.

•  Antenna is out of tunable length.
•  Poor grounding of antenna cou-

pler.

•  Breaker in coupler has tripped.
•  Connection cable loosened or dis-

connected.

•  Check the antenna connection.
•  Recommended length is 10 to 18 

meters.

• Check coupler ground.
•  Check mains voltage and polarity. 

If normal, reset the breaker.

•  Check the cable.

ERROR:
TX PLL UNLOCK
[CANCEL]: Stop alarm

TX PLL is unlocked. Transmission is 
stopped.

Contact your dealer.

ERROR:
RX PLL UNLOCK
[CANCEL]: Stop alarm

RX PLL is unlocked. Reception is 
stopped.

Contact your dealer.

ERROR:
WR1(2) PLL UNLOCK
[CANCEL]: Stop alarm

WR1(2) PLL is unlocked. Reception 
is stopped.

Contact your dealer.

ERROR:
Tx power reduced.
Main AMP heated.
[CANCEL]: Stop alarm

Power amplifier is too hot. Trans-
mission power is reduced to one 
level lower.

Allow amplifier to cool.

ERROR:
Tx power reduced.
Ship's main failure.
[CANCEL]: Stop alarm

AC power is interrupted and re-
placed with DC power (only when 
connecting PR-850A).

Can use DC power with low trans-
mission power. Check AC power 
and decrease the transmission 
power to the minimum. 

System was rebooted.

Unusual event is detected.

System restarts automatically.