Bedienungsanleitung Lowrance X-20A (Seite 4 von 16) (Englisch)

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4. The boat must be

moving

aslowtrolling speed

toseefish arches. If the boat

motionless,

fish

stay

in the

cone,

showing

on the

display

straight

horizontal

lines.

ELECTRICAL NOISE

major

cause of sonar

problems

electrical noise. This

usually

appears

on the

sonar's

display

as random

patterns

of dots or

lines. In severe

cases,

it can

completely

cover the screen with black

dots,

or cause the unit

operate erraticly,

or not at all.

eliminate or minimize the effects of electrical

noise,

first

try

to determine the

cause, With the boat at rest in the

water,

the

first

thing you

should do is turn all

electrical

equipment

on the boat off. Make certain the

engine

off,

also. Turn

on the sonar

unit,

then turn ASP off. There should be a

steady

bottom

signal

the

display.

Nowturn on

each

piece

of electrical

equipment

on the boat and view

the effect on the sonar's

display.

For

example,

turn on the

bilge pump

and view

the sonar

display

for noise. If no noise is

present,

turn the

pump

off,

then turn

on the VHF radio and

transmit.

Keep doing

this until all electrical

equipment

has

been turned

on,

their

effect on the sonar

display

noted,

then turned off.

you

find noise interference

from an electrical

instrument,

trolling

motor,

pump.

radio,

try

to isolate the

problem.

You can

usually

re-route the sonar unit's

power

cable and transducer cable

away

from the

wiring

that is

causing

the

interference. VHF radio antenna

cables radiate noise when

transmitting,

so be

certain to

keep

the sonar's wires

awayfrom

it. You

may

need to route the sonar

unit's

powercable directlyto

the

batteryto

isolate it from

otherwiring

on the boat.

If no noise

displays

on the sonar unit from

electrical

equipment,

then make

certain

everything except

the sonar

unit Is turned

off,

then start the

engine.

Increase the RPM with the

gearshift

in neutral. If

noise

appears

on the

display,

the

problem

could be one of three

things;

spark plugs,

alternator,

ortachometer

wiring.

Try using resistorspark plugs, alternatorfilters,

routing

the sonarunit's

power

cable

away

from

engine wiring. Again, routing

the

powercable directly

the

battery

helps

eliminate noise

problems.

Make certain to use the in-line fuse

supplied

with the unit when

wiring

the

power

cable to the

battery.

When no noise

appears

on the sonar unit after all of the

above

tests,

then the

noise source Is

probably

cavitation.

Many

novices or

persons

with limited

experience

make

hasty

sonar installations which

function

perfectly

in shallow

water,

orwhen the boat is at rest. In

nearly

all

cases,

the cause of

the malfunction

will be the location and/or

angle

of the

transducer. The face of the transducer

must be

placed

in a location that has a

smooth flow of water at all boat

speeds.

Read

your

transducer owners

manual for the best

mounting position.

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