Lowrance electronic X-15A r

wheels by reversing

the

proce-

dure used to remove the old

one. BE SURE

the fingers of

the new stylus

are pointed UP.

6. Close the front of the case.

Latch both catches at the top

of the unit.

MAINTENANCE

NOTE: The stylus may be

damaged if it is in front of the pla-

ten when the

platen assembly is

pulled down. Always

move the

stylus

to the

back side of the pla-

ten when

changing the

paper

rolls. Remember to move the belt

down to remove the

stylus.

Black carbon dust is created dur-

ing the recording process. Use a

soft, oil-free

rag to clean the

viewing door and metal platen be-

hind the

paper. Low pressure

compressed air may

be used to

blow dust out of the case and

away from moving parts if the air

is dry and free of oil.

All mechanical connections

should be checked periodically to

be sure they

haven't worked

loose.

HIGH VOLTAGE is present

in the

transmitter section when the

unit

is ON. No attempt

should be

made by any unauthorized per-

son to modify or repair

the elec-

tronic section.

All electrical connections should

be checked periodically and

cleaned as necessary.

The

face of the transducer, if

mounted on the transom

should

be washed periodically with mild

soapy water to remove

any ac-

cumulated rod grime or oily film.

This is essential to have

good

contact between the transducer

and the water.

DO SECTION

Do carry a spare fuse, stylus belt,

and roll of paper.

Do use the empty cardboard core

from the last roll of paper

on the

take-up post.

Do keep the recorded graphs

for

future reference.

Do clean the stylus belt, wheels,

and the rubber roller after

every

five rolls ofpaper.

DON'T

SECTION

DONT 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

win-

dow. (Except for small pieces of

tape.)

Don't

forget

to tape the paper to

the take-up

core.

Don't rotate the stylus belt up.

Don't use oily cloths, strong sol-

vents, or abrasive cleansers.

TROUBLESHOOTING SECTION

Symptom

On/Off switch is 'ON", but the

stylus and paper

don't move.

What To Do

Check fuse;

check connections at

battery for tightness and

corrosion.

Symptom

On/Off

switch is "ON", have

zero

mark, but no echoes or bottom

signal.

What To Do

Be sure the transducer is plugged

— GRAYL NI

/ -

rrIviv

Han

'nan

a n--• a.

Figure 4

When high Sensitivity settings

are used, a second bottom echo

will appear.

This is normal and is

caused by the returning signal re-

flecting

off the surface of the

water, making a second trip to the

bottom and back.

If detailed information about

brush piles, individual fish, or the

I

thermocline is desired, the Sen-

sitivity knob should be rotated to

approximately the ¾ point. Refer

to the illustration below to see

Figure 6

SENSITIVITY: TOO LOW

what effect the Sensitivity control

setting has on the recorded

information.

Recording individual fish with an

"arched" signature can usually

accomplished at trolling speed

with the Sensitivity

knob at the ¾

point, or higher. Refer to the sec-

tion "Arched Signatures" 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,

is any undesired signal. It can be

caused by an electrical source,

(such as the

engine's ignition sys-

tem) or by air bubbles in disturbed

water which is call cavitation. In

both cases, the noise could

pro-

duce unwanted marks on the

paper. (See Figures 7 &

8.)

Fortunately, noise pulses are rela-

tively

short in time

compared to

real sonar signals. Advancing the

Suppression knob will cause

the

system to reject these

unwanted,

short pulses without

reducing the

Figure 5

SENSITIVITY: PROPER SETTiNG

PDF compression, OCR, web-optimization with CVISION's PdfCompressor