Lowrance electronic X-15B snt

L'U -. -

Figure 20

END-OF-PAPER MARKER

The graph paper in the X-15B

has a red line printed at the

bot-

tom of the

paper

to signify

when

there is only 2 to 3 feet before the

end of the paper.

ZERO ADJUST

Occasionally, when changing

the stylus or stylus belt,

the

zero

line does not print 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-158 near

the upper left

hand corner so that the zero line's

position

may be adjusted on

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 /" 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 of the

X-15B 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 sQnar's cone of

sound is shown as "A".

When the fish has moved to

the center of the cone, the dis-

tance

to t will be shorter, (line

"B"), and as it moves out of the

cone, the distance will increase

again as shown in line "C".

0—

10 —

—

SO —

4° —

50—

60 —

Figure

If a 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,

If your transducer is mounted on

the transom, adjust

the transducer

until the fish show the distinctive

arched sighature. 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, or higher. Remember, that

there

must be some movement

between the boat and the fish to

develop the arched

mark. Usually

this means trolling at very slow

speeds with the main engine in

gear

at minimum throttle

setting.

THERMOCLINES

The

temperature of 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

called a thermoclino. The depth

and thickness of the thermocline

can vary

with the seaspn or time

of day1 In 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-153 can de-

tect this invisible layer in.tho

water, but the Sensitivity knob will

probably have to be set at the 1/2

point, or higher.

PAPER LOADING

CAUtION

— High voltage is pre-

snt 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,

to position the marking stylus

on the back side of the pla-

ten. NEVER move the belt up

—

the

stylu

may

be.

damaged. (See Figure 24.)

PECIAL NOTE: The stylus

may

be damaged if .the platen.

assembly is pulled down un-

less the stylus has been

moved to the back side of the

platen.

Figure

10 11

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