CR40/42/50 MKII Installation manual
Chapter 9
149
9.12 Troubleshooting
For all fault finding, first check that the supply voltage is between 10 – 32 V
dc.
Symptom
Check
Remedy
No picture on display
screen.
Check that the unit is
turned on.
Press the [PWR] key on
keypad.
Check fuse in CRXX
power cable.
Replace fuse. Use only type
F6.3A.
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 if C-MAP chart is
defective.
Remove C-MAP chart via
[MENU], [1], [3].
Return to factory presets,
see section 8.2.7.
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
“Display track” in sec.5.6.
Echo image on radar
display differs from actual
image.
Check if ship’s heading is
incorrect.
Set ship’s heading correctly
– see section 7.2.2.
Check if timing is incorrect. Set Zero Range correctly –
see section 7.2.2.
Echo images on radar
display are blurred.
Check if GAIN, STC or
FTC is not adjusted
properly.
Make adjustment – see
section 7.2.5.
Too much noise in radar
display.
Check if tuning is incorrect. Adjust TUNE – see section
7.2.2.
