Furuno 520 Manuales De Servicio

6.MAINTENANCE & TROUBLESHOOTING 

In addition to alarm messages your equipment displays error messages to alert 
you of potential equipment trouble. 
 

COMMUNICATION ERROR 

Communication between the control 

unit and the processor unit is 

interrupted for more than two 

seconds. 

Check the interconnection 

cable between control unit 

and processor unit. 

A SUDDEN POWER FAILURE 

HAS OCCURRED. 

Power supply was interrupted for 

more than two seconds. 

Press any key on the control 

unit. 

RUDDER ANGLE ERROR 

The rudder angle sent from the 

rudder reference unit exceeded 55°.

Check the rudder reference 

unit, rudder angle and its 

connection. 

RUDDER DRIVE ERROR 

The rudder did not move more than 

3° over 10 seconds after rudder 

command. 

Check the hydraulic system. 

After the solving problem, do 

the rudder test. 

DRIVE UNIT ERROR. PLEASE 

TURN OFF AND CHECK DRIVE 

CIRCUIT. 

Current of more than 50 A was 

detected on the drive circuit without 

rudder command. 

Check the drive circuit. 

DRIVE UNIT IS OVERLOADED. 

PLEASE TURN OFF AND 

CHECK DRIVE CIRCUIT. 

Overcurrent was detected. 

Check the drive circuit. 

DRIVE UNIT IS OVERHEATED. 

80°C temperature in drive unit was 

detected. 

Check the drive unit system.

BYPASS/CLUTCH IS 

OVERLOADED. 

Current of more than 5 A was 

detected on the bypass/clutch 

circuit. 

DISCONNECT B/C 

No current on the bypass/clutch 

circuit. 

Check the bypass/clutch 

circuit. 

FU REMOTE CONTROLLER 

ERROR 

Command from the FU remote 

controller exceeded 55°. 

Check the remote controller 

connection. 

MISSING HEADING DATA 

The heading data from the heading 

sensor is missing for 600 ms. 

Check the heading sensor 

and interconnection cable.. 

HEADING DATA ERROR 

Heading data with error flag was 

detected three times continuously. 

Check the heading sensor. 

MISSING NAV DATA 

The navigational data has been 

interrupted for more than 15 

seconds. 

Check the navigator. 

DEGRADATION OF NAV DATA 

QUALITY 

The navigation data was 

incomplete. 

Check the navigator settings.

PARAMETER ERROR OF NAV 

MODE 

The navigation data included an 

error flag. 

 

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