Koden CVS-875D, Installation Manual

Page: 121 / 122

CVS-875D/877D Chapter 3 Maintenance
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3-7
3.5 If you suspect a failure
Symptom Possible cause of trouble Measure
Even with power on,
nothing is displayed.
•
Fuse is blown.
•
Power voltage is out of
specification (21.6 to 31.2
VDC)
•
Poor connection between
power cable and battery
•
Replace the fuse (See “3.3
Fuse Replacement
”, page
3-2.
•
Use a proper power as per
specification.
•
Check the connection
between power cable and
battery.
After starting up, nothing is
displayed
•
Poor connection between
transducer and Display unit
•
Failure of LCD display panel
•
Check the connection
between transducer and
Display unit.
•
Consult a repair shop or
sales agent.
Much interference noise
•
Improper installation of
transducer
•
Interference from the echo
sounder on other boats.
•
Check the installed position
of transducer (See “1.5
Installation of transducer”,
page 1-10.
•
Implement interference
rejection.
Display of
water temperature / Speed
is abnormal or not
displayed.
•
Poor connection of sensors
connectors
•
Input sources may be
abnormal.
•
Check the connection at
sensor connectors.
•
Check the input sources.
Display of present
location/course is
abnormal or not displayed.
•
Poor connection between
this unit and navigation
equipment
•
Check the connection
between this unit and
navigation equipment.