Manual Lowrance X-15A (page 12 of 12) (English)

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END-OF-PAPER MARKER

The

graph paper

the X-1SA

has a red line

printed

at the bot-

tom of the

paper

signify

when

there is

only

2 to 3 feet before the

end of the

paper.

ZERO ADJUST

Occasionally,

when

changing

the

stylus

belt,

the zero

line does not

at the same

place

near the

top

of the chart

paper.

A zero

adjust

control has been

placed

on the back inside wall of

the X-15A near the

upper

left

hand corner so that the zero line's

position may

adjusted

the

paper.

Open

the case front and look

for the decal

marked 'ZERO AD-

JUST". You

may

have to

pull

the

paper transport assembly

down to

see the decal for the first time.

Push the

transport

closed and turn

on the unit.

(Caution

—

Keep

hands

away

from the

stylus

belt

and

stylus. High voltage

present.)

Insert a 6"-8"

long

screwdriver

with a 1/s" blade into the zero ad-

just

hole and rotate the control on

the circuit board until the zero line

is at the desired

position. (Note:

This

may

also be

adjusted

with

the unit turned OFF.

Adjust

the

control,

then remove the screw-

driver and turn

power

back ON.

Repeat

until

the zero line is in

the desired

position.)

IV HOW TO READ GRAPHS

"Arched

Signatures"

A remarkable

advantage

the

X-15A is that it can record indi-

vidual fish with a characteristic

arched mark that

separates

them

from their

stationary surroundings.

The

reason for this is shown be-

low.

The

distance to a fish when it

moves into the sonar's cone of

sound is shown as

"A".

When the fish has moved to

the center of the

cone,

the

dis-

tance to it will be

shorter,

(line

"B"),

and as it

moves out of the

cone,

the distance will increase

again

as shown in line "C".

—

Figure

partial

arch occurs most of

the time on

your

unit,

(the

mark

curves

up,

but not back

down,

vice-versa)

it is

because the trans-

ducer is

not

pointed

straight

down.

your

transducer is

mounted on

the

transom, adjust

the

transducer

until the fish show the

distinctive

arched

signature.

This

may

take

some trial and error until the cor-

rect

mounting

is achieved.

Sharp,

well defined

signatures

will occur most often when the

Sensitivity

knob is set at the ¾

point,

higher.

Remember,

that

there must be some movement

between the boat and the fish to

develop

the arched mark.

Usually

this means

trolling

very

slow

speeds

with the main

engine

gear

at minimum throttle

setting.

THERMOCLINES

The

temperature

water

in the

lake is seldom constant from

top

to bottom.

Layers

of different tem-

peratures

form,

and the

junction

a warm and cool

layer

of water is

called a thermocline. The

depth

and thickness of the thermocline

can

vary

with the season or time

day.

deep

lakes there

may

be two or

more,

at different

depths.

Thermoclines are

import-

ant to the fisherman because

they

are areas where fish are active.

Many

times bait fish will be above

the thermocline while

larger game

fish

suspend just

below it.

Your Lowrance X-15A can de-

tect this invisible

layer

in the

water,

but the

Sensitivity

knob will

probably

have to be set at the 1/2

point,

higher.

PAPER LOADING

CAUTION

—

High voltage

pre-

sent in the electronic section

when the unit is turned on.

1. TURN THE UNIT OFF.

2. Release both catches on the

top

of the case. Pull out and

down on the

top

of the case

front to

expose

the

platen

as-

sembly. (See Figure 23.)

3. Move the

stylus

belt

DOWN,

position

the

marking stylus

the back side of the

pla-

ten. NEVER move the belt

—

the

stylus may

damaged. (See Figure 24.)

SPECIAL NOTE: The

stylus

may

damaged

if the

platen

assembly

pulled

down un-

less the

stylus

has been

moved to

the back side of the

platen.

0—

—

40—

-4

-v-,

Figure

10 11

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Lowrance X-15A Manual

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