CP34/44/54 Troubleshooting, Service and Specifications Chapter 9-1
9.1 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 T6.3A slow (5x20mm)
Picture appears on the
display screen, but image
is too dark or too bright
Press [PWR], adjust light
and press [ENT]
No normal picture or key
operation
Turn unit off and on again
Disconnect power and
connect power again
Check via [MENU], [6],
[CHART] if C-MAP chart
is defective
Remove C-MAP chart if
defective
Return to factory presets,
see section 8.6
No GPS position update Check that position
mode is INTERNAL,
refer to interface setup in
[MENU],[6],[2], Position
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.7.2, and turn off ‘Dis-
play track’ in sec.7.6
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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