Furuno GP-1650F, GP-1650DF Error Messages, 13-3, Simple troubleshooting sounder, Error messages

Table 13-3 Simple troubleshooting (sounder)

If...	Then...
no picture but marks and characters	check if picture advance speed is set to "STOP" on the
appear	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 to zero to correct.
picture sensitivity is too low	check gain setting, if using manual operation.
	marine life or air bubbles may be clinging to transducer face.
	water may be dirty.
	bottom may be too soft to return a suitable echo.
depth is not displayed	adjust gain to display bottom echo in dark tone.
noise or interference obstructs the	check if transducer cable is near ship's engine. If it is,
display	relocate it.
	check ground.
	other video sounders may be operating nearby and on same
	frequency.
water temperature graph appears	check for loosened sensor cable.
but no or wrong readout

13.4 Error Messages

This equipment displays the following error messages on the alarm menu to alert you to possible trouble.

Table 13-4 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-1650DF only)
VOLTAGE OF	Voltage of internal
	battery is low.
INTERNAL BATTERY IS
	Request replacement
LOW.	of battery.

13-3