45
●
When the unit has any problems, please check the following points before sending
back the unit for repair.
Symptoms Cause
Remedy
Voltage of battery is lower
than standard value (11V).
Recharge the battery.
Contact of power connector
is poor.
Retighten it. Remove and
clean the rust/dust. Replace it
in the case of corrosion.
・
Replace the power cable
・
Replace the connector on the
unit.
Wrong connection of power.
Opposite polarity
+-
.
Check the polarity and connect
it property.
Cut wire inside power cable.
Exchange to new power cable.
Power cannot be
turned on.
Blown fuse.
Send it for repair.
No display on
screen
Brightness is set to minimum
level.
Adjust the brightness.
(refer to [Brightness
Adjustment] p.19
)
Contact problem with
transducer connector
Retighten the connection.
Remove/clean the rust/dust.
Replace it in the case of
corrosion. Send it for repair.
<Problem with Transducer>
Check followings and replace it in the case of actual problems.
1
.
It’s normal if you hear the sound like “Bo Bo” from the
surface of transducer.
2
.
It’s normal if rain like dots appear on the transducer surface
after setting the sensitivity and depth to the max and rubbing
the transducer surface.
Transducer is not immersed
enough into the water.
Adjust the transducer
installation so that it is always
beneath water surface.
Bottom or fish
cannot be
displayed at all.
Internal liquid is not enough
inside the case.
Add enough liquid to immerse
the transducer.
Transducer is not immersed
enough into the water.
Adjust the transducer
installation so that it is always
beneath water surface.
Problem with transducer
installation causes the image
problem due to air bubbles at
speeding the vessel.
Check the installation of
transducer.
Image does not
appear sometimes.
Influence from other vessel
causing air bubbles.
Move to other location or wait
until air bubble disappears.
18. CAUTION ON SAFETY