Furuno GP-1850DF, GP-1850F manual Replacement of Fuse, Battery, Simple Troubleshooting, 13-2

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 3A 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 equipment damage.

A battery installed on a 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 ST2	000-133-495
Battery

13.3 Simple Troubleshooting

Below are simple troubleshooting procedures which the user can follow to restore normal operation.

Table 13-2 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 battery for proper voltage output (10.8 to 31.2 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	turn on the power again.
pressed
	check for loosened antenna connector.
position is not fixed within 3 minutes.	check for frequency deviation of GPS receiver on GPS
	monitor display.
	check GPS receiver status indication.
	check that the correct geodetic chart system is selected on
position is wrong	the GPS/DGPS/TD OPTIONS menu.
	enter GPS position offset on the GPS/DGPS/TD OPTIONS
	menu.
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 GPS/DGPS/TD OPTIONS menu.
Loran TDs are wrong	enter TD offset on the GPS/DGPS/TD OPTIONS menu.
ship's speed display is not zero after	try to decrease GPS speed smoothing setting on the
ship is stopped	GPS/DGPS/TD OPTIONS menu.

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