Bedienungsanleitung Lowrance X-1550 (Seite 7 von 12) (Englisch)

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mounted on the transom should

be washed

periodically

with

mild

soapy

water to remove

any

ac-

cumulated road

grime

oily

film.

This is essential to have

good

contact between the transducer

and the water.

Periodically,

the rubber roller on

the

paper

drive

should

be cleaned

with a cloth

dampened

with al-

cohol,

improve

the friction on

the drive shaft.

(See page 16,

Figure 29).

DO SECTION

carry

spare

fuse,

sty/us

belt,

and roll of

paper.

Do use the

tape

from a new roll

paper

to attach it to the

take-up

spool.

Do use the

empty

cardboard

core from the last roll of

paper

the

take-up post.

carry

pencil

to make

notes

on the

paper.

keep

the recorded

graphs

for future reference.

Do clean the

stylus

belt and

wheels with alcohol after

every

five rolls of

paper.

DON'T SECTION

DON'T OPEN

THE.CASE

WHEN THE UNIT IS ON.

Don't

pull

the

platen assembly

down when the

stylus

is at the

front.

Don't store

any objects

inside

the case or behind the

viewing

door.

Don't

forget

tape

the

paper

the

take-up

core.

Don't rotate the

stylus

belt

up.

Don't use

oily

cloths,

strong

sol-

vents or abrasive

cleansers.

TROUBLESHOOTING

Symptom

On/Off

switch is

ON",

but the

stylus

and

paper

don't move.

What To Do

Check

fuse;

check

connections

battery; tighten power

cord

connector,

Symptom

On/Off

switch is

'ON",

have

zero

mark,

but no echoes or bot-

tom

signals.

What To Do

Be sure the transducer is

plugged

into the unit and the

transducer is in contact with the

water.

Symptom

The unit is

ON,

but

paper

does

not move.

What To Do

Tape Paper

to cardboard

spool

take-up post.

Symptom

Recorder marks are faint or dim.

What To Do

Clean

viewing door; replace

the

stylus;

check

battery

connections.

Sympton

Recorded marks are

very

heavy; paper

is torn

by stylus.

What To Do

Bend the

stylus slightly

to re-

duce

pressure

paper.

VI ADVANCED OPERATION

Surface

Clarity

Control

(SCC)

The surface

markings

at the

top

of the chart

paper

can,

times,

extend

many

feet below the sur-

face. This often interferes with the

area that one is

trying

graph.

Surface clutter is caused

by algae

and

plankton,

air bubbles created

wave action or boat

wakes,

bait

fish,

temperature

inversions.

The

surface

clutter can be re-

duced or eliminated

using

the

MARK/SCC

key

on the control

panel.

To use the

SCC, control,

press

for minimum

effect,

for an inter-

mediate

control,

or 3 for maximum

elimination of surface

clutter,

and

then

press

MARK/SCC.

reduc-

tion of the surface clutter

will im-

When

high Sensitivity settings

are

used,

a second bottom echo

will

appear.

This is normal and is

caused

the

returning signal

re-

flecting

off the surface of

the wa-

ter,

making

a second

trip

to the

bottom and back.

When detailed information

about

brush

piles,

individual fish

or the

thermocline is

desired,

the Sen-

sitivity

knob

should be set at about

point.

Refer to the illustration

below to see what effect the Sen-

sitivity setting

has on the recorded

information.

Recording

individual fish with an

"arched"

signature

can

usually

accomplished

trolling speed

with the

Sensitivity

knob at the 3/4

point,

higher.

Refer to the sec-

tion "Arched

Signatures,"

page

10 for more information about this

important

function of

your

recorder.

Suppression

Control

The

Suppression

Control is

used to reduce interference

from

noise.

Noise,

in electronic

terms,

any

undesired

signal.

It can be

caused

an electrical

source,

(such

as the

engine's

ignition sys-

tem),

air bubbles in dis-

turbed water which is called cavi-

tation noise. In both

cases,

the

noise could

produce

unwanted

marks on the

paper. (See Figure

45.) Fortunately,

noise

pulses

are

relatively

short in time com-

pared

to real sonar

signals.

Ad-

vancing

the

Suppression

knob will

cause the

system

reject

these

unwanted,

short

pulses

without

reducing

the

sensitivity

any way.

This

patented design

is exclu-

Figure

7 SENSITIVITY: TOO Low

Figure

SENSITIVITY:

PROPER SETTiNG

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