Furuno DS-80 Troubleshooting, Problem Probable cause Remedy General, Doppler speed indication

3.2Troubleshooting

This section provides troubleshooting procedures. Advanced level troubleshooting should be done by referring to the Service Manual (optional supply).

Problem	Probable cause	Remedy
General
Cannot turn on the	Loosened power cable	Fasten the power cable.
power.
	Blown fuse	Replace the fuse.
Power is on but	Contrast too low.	Press the [*] key several times.
nothing appears on
the screen.

Doppler speed indication

SPEEDSTW

10.0
	kt
DISTANCE

12.50

nm

Last correct speed is displayed (display freezes).

Reverse video and blinking

Ship’s speed cannot be calculated because of air bubbles, etc. (Speed error : 30 seconds)

						• Problem with the transducer or air
	SPEED	STW		Speed shown as "**.*".
		**. *kt					bubbles.
	DISTANCE
		12.50				• Speed error continues more than 30
		nm					seconds.
					STW	•	Temperature sensor is abnormal.
	SPEED	STW
	DISTANCE	10.0 kt			flashing
		12.50
		nm
GPS speed indication
						GPS data error.
	SPEED	GPS	Speed indication shown as "**.*".
	DISTANCE	**.*kt
		12.50
		nm
						•	No GPS data for 30 seconds.
	SPEED	----		"GPS" is replaced with "----".
		---				•	GPS receiver disconnected.
	DISTANCE	kt
		12.50
		nm

If any abnormal speed indication continues contact your dealer for advice.

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