CA42/50/52 Troubleshooting, Maintenance and Service
Chapter 11
145
11.1 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 CAXX 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 10.7.
No GPS position update.
Check external position to
be OFF, refer to interface
display in [MENU], [8], [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.
Picture appears normal, but
no targets are shown or
only random “noise” is seen
Check that the correct
transducer is selected.
Go to Echosounder setup
and select transducer type.
Check the transducer con-
nectors are wired properly.
If not properly wired,
rewire the connectors.
Check that the transducer
connectors are securely
mated with the console.
Correctly mate the
connectors to the console.
Check that the receiver gain
is set high enough.
Increase the receiver gain
in 7.9 Presentation setup.
Check that the range is cor-
rect for the water depth.
Adjust the range in 7.9
Presentation setup.
Excessive noise in echo
picture.
Check for correct
grounding.
Connected equipment must
be properly grounded
between it and main unit.
