Furuno FI-504 Manual De Usuario

2. MAINTENANCE, TROUBLESHOOTING

If you feel the equipment is not functioning properly, follow the proce-
dures in the table below to try to restore normal operation. If normal op-
eration cannot be restored, do not attempt to check inside the cabinet. 
There are no user-serviceable parts inside.

Display is 
blank. Panel is 
not lit.

• Power supply
• Cabling disconnected or

damaged.

• Check power supply.
• Check cabling.

Power is on but 
no or some 
data.

Sensor is turned off.
Cable from sensor is disconnected 
or damaged.

• Turn on sensor.
• Check cabling.

Inaccurate data • Electromagnetic field generating 

equipment is in operation.

• Cabling from sensor is damaged.

• Sensor is improperly aligned 

(where applicable).

• Turn off all electromagnetic field 

generating equipment. Turn them on 
and off one by one. Check the dis-
play. Relocate offending equipment 
or this instrument as appropriate.

• Check cabling.

• Check installation. If installation is 

proper, an offset may be applied to 
certain data. For details, see section 
1.7.