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28 NAVMAN FISH 4200 Installation and Operation Manual
is located. To stop problems from electrical
noise, try:
- rerouting the power and transducer
cable(s) away from the boat’s other
electrical wiring.
- routing the unit's power cable directly to the
battery instead of through a fuse block or
ignition switch.
4. Bottom is not displayed:
a) The fishfinder may have Manual Range
selected and the depth may be outside the
range value selected. Either change the
fishfinder to Auto Range or select another
depth range - see section 3-9.
b) The depth may be outside the fishfinder’s
range. While in Auto Range, the display unit
will flash the last depth displayed, then display
“--.-” to indicate that there is no bottom
detected. A display of the bottom should
reappear when it is shallower than 180m (600
ft).
5. The bottom is displayed too far up the
screen:
The fishfinder may have Manual Range
selected and the selected Range value is too
high for the depth. Either change the fishfinder
to Auto Range or select another depth range -
see section 3-9.
6. Bottom echo disappears or erratic digital
reading while the boat is moving:
a) Ensure the back of the bottom surface of the
transducer is slightly lower than the front and
the front is as deep in the water as possible in
order to minimise the generation of bubbles
through cavitation. See the Transducer
Installation Guide for more information.
b) The transducer may be in turbulent water. Air
bubbles in the water disrupt the echoes
returned, interfering with the fishfinder’s ability
to find the bottom or other targets. This often
happens when the boat is reversed. The
transducer must be mounted in a smooth flow
of water in order for the fishfinder to work at all
boat speeds.
c) Electrical noise from the boat’s motor can
interfere with the fishfinder. Try some
suppression spark plugs.
7. If the fishfinder beeps when turned on but
nothing is displayed:
The fishfinder may be operating, but the
contrast settings may have been set too high
or low. Power off the fishfinder. Then hold
and press to reset the fishfinder to the
default contrast setting.
8. The wrong language is displayed:
See section 2.
9. Fuel USED or REMAINING seem inaccurate:
a) If the engine is run whilst the fishfinder is
powered off, the fishfinder does not record
the amount of fuel used during that engine
run. Consequently, the FUEL REMAINING
value will be higher than the actual amount of
fuel remaining in the tank.
To avoid this problem, use the Auto Power
Wiring option described in section 5.4. This
ensures that the fishfinder powers on
automatically whenever the boat’s ignition is
switched on.
b) In rough seas, fuel may surge back and forth
through the fuel transducer, resulting in
incorrect readings. Try installing a one-way
valve between the fuel transducer and the
fuel tank.
c) The SET REMAINING fuel value must be
reset after every refuelling. See section 4-7.
d) The fuel tank may not refill to the same
capacity each time due to air pockets. This is
particularly noticable with underfloor tanks.
e) Fuel transducers wear out over time and
should be replaced after every 5000 litres of
fuel.
10. FLOW indicates no fuel or low fuel
a) Check that the fuel cable connectors are
securely plugged in and the collar is locked in
place. The collar must be locked in place to
give a watertight connection.
b) A fuel transducer may be clogged. If so,
remove the transducer from the fuel line and
gently blow through it in the opposite direction
to the fuel flow.
A fuel filter between the fuel transducer and
the fuel tank must be installed as per the fuel
installation guide. Failure to do so will void
the warranty.
c) Inspect the fuel cable from end to end for
damage such as cuts, breaks, or squashed
sections.
d) Check that the fuel filter is clean.
e) Installation implications.
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