Lowrance electronic X-20A User Manual

X-20A

INSTALLATION AND OPERATION

INSTRUCTIONS

INC.

LITHO IN U.S.A. 988-0105-36

•LOWRANCE

12000

E. SKELLY

ELECTRONICS,

DR.,

TULSA,

OK 74128

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TABLE OF

CONTENTS

INTRODUCTION INSTALLATION

POWER CONNECTIONS KEYBOARD BASICS

OPERATION SENSITIVITY

CHART

RANGE

ZOOM

DIGITAL FISH I.D.

SPEED

FEATURE

AUTO

ALARMS

CHARTALARM

ALARM

FISH

SPEAKER

LIGHT MODE

SIMULATOR

TRANSDUCERS

SIGNAL

FISH

WATER TEMPERATURE AND THERMOCLINES SURVEYING

INTERPRETATION

ARCHES

AND CONE ANGLES

A LAKE

BAIT FISH

SPECIFICATION

SERVICE

TROUBLESHOOTING

INFORMATION

1 1

2

3

5 5 7 8 8 9

10

11 11

12

13

13 13 14 16 17 18 18 20

21

22 22 23 23

1991,

All

rights

Lowrance

reserved.

subject

Electronics,

to

change

in this manual are simulated.

Copyright

All features

©

and

specifications

All screens

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26

Inc.

without notice.

4. The boat must be

is

motionless,

lines.

fish

stay

moving

in the

at

aslowtrolling speed

cone,

showing

ELECTRICAL NOISE

A

sonar's completely

cause of sonar

major

display

is

problems

as random

electrical noise. This

patterns

of dots or

cover the screen with black

dots,

or not at all.

To

eliminate or minimize the effects of electrical

cause, With the boat at rest in the

electrical

on the sonar

the

equipment

display.

unit,

Nowturn on

the effect on the sonar's the sonar

on the VHF radio and been turned

If

you

or

power

interference. VHF radio antenna

certain to unit's

display

on,

find noise interference

radio,

to isolate the

try

cable and transducer cable

keep

powercable directlyto

on the boat off. Make certain the

then turn ASP off. There should be a

each display.

for noise. If no noise is

transmit.

their

effect on the sonar

problem.

the sonar's wires

water,

of electrical

piece

For

example,

Keep doing

from an electrical

You can

away

cables radiate noise when

awayfrom

the

batteryto

toseefish arches. If the boat

on the

display

as

usually

lines. In severe

or cause the unit

first

noise,

the

first

thing you

engine

steady

equipment

turn on the

present,

this until all electrical

display

noted,

instrument, usually

from the

it. You

isolate it from

on the boat and view

bilge pump

turn the

then turned off.

trolling

re-route the sonar unit's

wiring

need to route the sonar

may

otherwiring

straight

horizontal

appears

cases,

on the

it can

operate erraticly,

to determine the

try

should do is turn all

is

also. Turn

off,

bottom

signal

on

and view

pump

equipment

motor,

that is

causing

transmitting,

has

pump.

the

so be

then turn

off,

on the boat.

If no noise

certain Increase the RPM with the

the

problem

wiring.

power

the

battery

supplied When no noise

noise source Is experience

water,

displays

everything except

could be one of three

Try using resistorspark plugs, alternatorfilters,

cable

away

helps

with the unit when

make

orwhen the boat is at rest. In

will be the location and/or

must be

Read

placed

transducer owners

your

on the sonar unit from

the sonar

gearshift

in neutral. If

things;

from

engine wiring. Again, routing

eliminate noise

appears

probably

on the sonar unit after all of the

sonar installations which

hasty

problems.

the

wiring

cavitation.

nearly

of the

in a location that has a

angle

manual for the best

electrical

unit Is turned

noise

spark plugs,

equipment,

then start the

off,

appears

alternator,

or

routing

the

powercable directly

then make

engine.

on the

display,

ortachometer

the sonarunit's

Make certain to use the in-line fuse

cable to the

power

novices or

Many

all

cases,

transducer. The face of the transducer smooth flow of water at all boat

battery.

above

tests,

persons

function

the cause of

mounting position.

perfectly

the malfunction

then the

with limited

in shallow

speeds.

to

25

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Weak bottom

2. Electrical

the sonar to This can cause the unit to eliminate from the

3. The water

sonar can't find the bottom flash

continuously.

are in. If this

you

to a realistic

range

move Into shallower

you

4.

Check

also

drops, reducing

echo, digital readings

noisefromthe boat's motorcan interfere wlththe sonar. This

automatically

display.

may

happens, place

one,

the

battery voltage.

increase its Discrimination

be

It

may change

than the sonar's

deeper

signal

(for example,

water,

a bottom

while it's in the

the unit in the manual mode,

if the

its

to find the bottom or

ability

erratic,

weakersignals

the

range

0-100

voltage drops,

or no fish

ability

automatic

to limits far

and increase the

feet)

should

signal

signals (cont4:

or noise

such

to

the unit's transmitter

targets.

rejection

as

oreven structure

fish

find the bottom. if the

the

mode,

greaterthan

then

change

sensitivity.

appear.

causes

feature.

will

digital

the water

the

As

power

INTRODUCTION Welcome to the world of

a

high quality

sonar

sportfishing

designed

for both

This unit has an automatic feature depth, fish,

and structure. As

can "fine tune" the unit to the from

Although board and

Read this manual

a

great

the

to

sonar.

your

the X-20A

operation

reference should

the more

water,

has

many

modes makes it

and take it with

you

your

become

you

surrounding

features and

you

need it. The more

X-20A can do for

sonar. Your Lowrance

professional

that finds and

familiar with

and novice users.

displays

your

conditions to

the

use and understand.

this unit. it makes

use

know when

easy

when

functions,

to

you

you!

X-20A is

bottom

the

X-20A, you

the most

get

simple key-

you get

Bottom bottom echo while boat Is

1. The transducer

flow of water in order forthe sonar to work at all boat water

other

echo

disrupt

targets.

disappears

may

the sonar

The technical term for this is 'Cavitation'.

at

high speeds

moving

be in turbulent water. It must be mounted signals, interfering

or erratic

with its

speeds.

ability

dIgital

to find the bottom or

2. Electrical noise fromthe boat's motorcan Interfere with the the sonar to

This can cause the unit to eliminate from the

and transducer cables

No fish

1. Make certain problem

automatically

display. Try using resistorspark plugs

arches when the Fish ID feature Is off:

transducer is

if a

partial

increase its Discrimination or noise

weakersignals

from other electrical

away

arch is

pointing straight

displayed.

See the Fish Arch section in this manual

such as fish oreven structure

or

down. This is the

routing

wiring

the

on the boat.

for more information.

2. The

sensitivity may

it has to be able to receive the fish's echo from the time

arch,

it leaves. if the

until when it is in the center of the cone.

3. Use the Zoom feature, in on a small better luck This

enlarges

range

seeing

the

not be

high enough.

sensitivity

is not

It is much easierto

of waterthan a

fish arches with targets,

allowing

in orderforthe unit to

high enough,

display

one. For

large

a 30 to 60 foot

the

display

the unit

example, you

range

to show

displays

fish arches when zoomed

than a 0 to 60 foot

much more detail.

reading

or weak

in a smooth

Air bubbles in the

sonar. Thiscauses

rejection

sonar unit's

feature.

power

most common

a fish

display

it enters the cone

the fish

will have much

only

range.

INSTALLATION Mounting

install the unit in

when tilted

wood screw back of thin

there is

transducer

You can route

in the

up through

After

(RTV).

for the best

or

through

panels

enough

cables.

the

mounting

the hole. Then

routing

the

the bracket to cover the hole. Route the

Offset

convenient

any

to secure the

room behind the unit to

power

surface.

cables,

the slot in the rear of the

that can be

punched

out for

NOTCIII

location,

viewing angie.

bolt

mounting.

mounting

provided

Holes

Place a

hardware. Make certain

there is clearance

in the bracket base allow

piece attach the

and transducer cables

First

push

the transducer

pass

the

power

through

cable

connector and cable

wire down

fill the hole with silicone rubber

bracket. There are two notches

more

cables,

if

necessary.

of

plywood

on the

power

a one inch hole

through

adhesive

cables

through

in the bracket

and

it.

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