Furuno GP-1850WDF, GP-1850WF manual Replacement of Fuse, Battery, Simple Troubleshooting, 13-2

13. MAINTENANCE & TROUBLESHOOTING

13.2Replacement of Fuse, Battery

The fuse on the power cable protects the system from reverse polarity of the ship’s mains and equipment fault. If the fuse blows, find the cause before replacing it. Use only a 5 A fuse. Using the wrong fuse will damage the unit and void the warranty.

CAUTION

Use the correct fuse.

Use of a wrong fuse can cause fire or damage the equipment.

A battery installed on the circuit board inside display unit preserves data when the power is turned off. The life of the battery is about three years. When the battery voltage is low the battery icon () appears on the display. When this happens, contact your dealer to request replacement of the battery.

	Type	Code Number
Lithium	CR2450-F2	000-144-941
Battery	ST2L

Note : Use only the specified battery. Use of an incorrect battery may cause explosion. Dispose of the battery in accordance with local regulations.

	13.3 Simple Troubleshooting
	Below are simple troubleshooting
	procedures which the user can follow to
	restore normal operation.
Simple troubleshooting (plotter)
If …	Then …
	check for blown fuse.
	check that the power connector is firmly tightened.
you cannot turn on the power
	check for corrosion on power cable connector.
	check for damaged power cable.
	check ship’s battery for proper voltage output (12/24 V).
power is on but nothing appears	press the [POWER/BRILL] key and then the cursor pad
	to adjust display brilliance and tone.
there is no response when a key is pressed	turn on the power again.
	check for loosened antenna connector.
position is not fixed within 90 seconds.	check for frequency deviation of GPS receiver on GPS
	monitor display.
	check GPS receiver status indication.
track is not plotted	plotting is stopped. (“H” appears on the plotter display.)
bearing is wrong	check that correct magnetic variation is entered on the
	DISPLAY OPTIONS menu.
loran or Decca TDs do not appear	check that proper Loran or Decca chain codes are
	entered on the DISPLAY UNIT.
loran TDs are wrong	enter TD offset on the GPS/DGPS/TD OPTIONS menu.
ship’s speed display is not zero after ship is stopped	try to decrease GPS speed smoothing setting on the
	GPS/DGPS/TD OPTIONS menu.

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