Chapter 10-12 GN33 Installation and service
10.9 Troubleshooting
For all fault finding, first check that the supply voltage is between 10-32 VDC
Symptom Check Remedy
No picture on display
screen
Check that the unit is
turned on
Press the [PWR] key on
keypad
Check fuse in power cable
fuse holder
Replace fuse. Use only
type 4.0A slow
Picture appears on the
display screen, but image
is too dark or too bright
Press [PWR], adjust light/
contrast, press [ENT]
No normal picture or key
operation
Turn unit off and on again
Disconnect power and
connect power again
Check via [MENU], [1],
[3] if C-MAP chart is
defective
Remove C-MAP chart if
defective
Return to factory presets,
see section 9.7
No GPS position update Check external position to
be OFF, refer to interface
display in [MENU],[7],[2]
Check antenna and cable Replace antenna or cable
Screen update is
extremely slow
Check that the stored
Tracks and Routes (not
currently in use) are not
all drawn up on the chart
Turn off ‘Course line’
for each stored route in
sec.5.2, and turn off ‘Dis-
play track’ in sec.5.6
All data is deleted after
turning off the unit and
turning it back on
Check battery lifetime.
Expected lifetime is min.
5 years
Internal battery must be
replaced by authorized
dealer
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