Furuno GP-3700F, Operator'S Manual

Page: 194 / 224

13. MAINTENANCE, TROUBLESHOOTING
13-4
Echo sounder troubleshooting
Track for own ship is not plot-
ted. • Check that [DISP. STOPPED TRACKS] in the
[MARK/TRACK SETTING] menu is set to [SHOW].
• Check that [DISPLAY TRACKS] in the [MARK/
TRACK SETTING] menu is set to [SHOW].
Loran (or Decca) TDs are not
displayed. Check the Loran or Decca chain number on the
[PLOTTER DISPLAY SETTING] - [LORAN/DECCA
SETTING] menu.
Loran (or Decca) TDs are
wrong. Correctly enter TD offset on the [PLOTTER DISPLAY
SETTING] - [LORAN/DECCA SETTING] menu.
Bearing is wrong. Check the [MANUAL MAG. VAR.] setting in the [SYS-
TEM SETTING] - [DISPLAY FORMAT] menu.
The ship’s speed indication is
not zero after the ship is
stopped. Try to decrease the setting for [SPEED AVERAGING]
in the [SYSTEM SETTING] - [NAVIGATOR SETUP]
menu.
Data from NMEA2000 equip-
ment are not received. Turn on the NMEA2000 network power first. If the
GP-3700F power is turned on first, restart it.
AIS target without heading data
points true north always. Check the course by displaying the AIS target data
(see section 12.4.1).
Symptom Remedy
Picture does not move, al-
though marks and characters
appear. • Check that the picture advance setting in the
[ECHO SOUNDER SETTING] menu is set to other
than [STOP PICTURE ADVANCE].
• Check if the transducer cable is tightly connected.
Zero line does not appear al-
though the picture appears. Check if the picture is shifted.
Picture sensitivity is too low. • Check gain setting if in manual operation.
• Marine life or air bubbles may be adhering to the
transducer face.
• Bottom echo may be too soft to return a suitable
echo.
Depth indication is not dis-
played. Adjust gain and range settings to display the bottom
(in reddish brown), if in manual operation.
Noise or interference appears
on the display. • Turn off engine. If noise disappears suspect engine
noise. Contact your dealer for advice.
• Check the ground for tight connection, rust.
• Other sounder of the same frequency as yours may
be in the vicinity.
Data is wrong although the wa-
ter temperature graph appears. Check if the sensor cable is firmly tightened.
Symptom Remedy