Furuno GP-1850WF, GP-1850WDF Error Messages, 13-3, Simple troubleshooting sounder, If … Then …

	13. MAINTENANCE & TROUBLESHOOTING
Simple troubleshooting (sounder)
If …	Then …
	check if picture advance speed is set to “STOP”
no picture but markers and characters appear	on the SOUNDER SETUP OPTIONS menu.
	check for loosened transducer connector.
picture appears but no zero line	if using manual video sounder operation, range
	is shifted; set shifting zero to correct.
	check gain setting, if using manual operation.
	marine life or air bubbles may be clinging to
picture sensitivity is too low	transducer face.
	water may be dirty.
	bottom may be too soft to return a suitable echo.
depth is not displayed	adjust echo offset on the SOUNDER SETUP
	OPTIONS menu (SYSTEM SETUP soft key).
	check if transducer cable is near ship’s engine. If
	it is, relocate it.
noise or interference obstructs the display	check ground.
	other video sounders may be operating nearby
	and on same frequency.
water temperature graph appears but no or	check for loosened sensor cable.
wrong readout

13.4 Error Messages

The GP-1850WF/1850WDF displays the following error messages on the alarm menu to alert you to possible trouble.

Error messages

Error Message	Meaning, remedy
NO GPS FIX	No GPS signal. Check
	antenna cable.
NO DIFFERENTIAL	No DGPS signal.
GPS CORRECTION.	Check antenna.
(GP-1850WDF only)
VOLTAGE OF	Voltage of internal
INTERNAL BATTERY	battery is low.
IS LOW.	Request replacement
	of battery.

13-3