Bedienungsanleitung Navman FISH 4431 (Seite 29 von 30) (Englisch)

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Fish 4430/4431 Installation and Operation Manual

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

180 m (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 3-8).

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).

e) 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).

f) Check the transducer and power cable LT

connectors at the back of the display unit

are securely plugged in and the collar is

locked in place. The collar must be secure

for watertight connection.

g) Inspect the transducer and power cables

from end to end for damage such as cuts,

breaks or squashed sections.

h) Ensure there is not another fishfinder

or depth sounder turned on, which may

interfere with the FISH 4430/4431.

i) Electrical noise from the boat’s engine

or an accessory may be interfering with

the transducer(s) and/or the NAVMAN

fishfinder. This may cause the fishfinder

to automatically decrease the gain unless

using Manual Gain. The fishfinder thus

eliminates weaker signals such as fish or

even the bottom from the display. This

may be checked by switching off other

instruments, accessories (e.g. bilge pump)

and the motor until the offending device 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 3-8).

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Navman FISH 4431 Seite 29

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