Furuno Radar Detector CH 37 User Manual

COLOR SECTOR SCANNING SONAR

CH-37

MODEL

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Your Local Agent/Dealer

9-52 Ashihara-cho,

Nishinomiya, Japan

Telephone : 0798-65-2111

Telefax :

0798-65-4200

FIRST EDITION : JUL. 1998

Printed in Japan

: MAY. 17,2002

PUB.No. OME-13030

*00080821101*

* 0 0 0 8 0 8 2 1 1 0 1 *

( TENI

)

CH-37

*OME13030E00*

* O M E 1 3 0 3 0 E 0 0 *

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CAUTION

WORKING WITH THE SONAR OIL

Precautions

•

Keep oil away from eyes. Wear protective

gloves when working with the oil. The oil

can cause inflammation of the eyes.

Do not touch the oil. Wear protective

gloves when working with the oil. The oil

can cause inflammation of the skin.

Do not ingest the oil. Diarrhea or vomiting

can result.

•

Keep the oil out of reach of children.

Emergency

•

If the oil enters eyes, flush with clean water

about 15 minutes. Consult a physician.

If the oil contacts skin, wash with soap and

water.

If the oil is ingested, see a physician

immediately.

Name: Warning Label (1)

Type: 86-003-1011-0

Code No.: 100-236-230

Disposal of oil and its container

Dispose of oil and its container in accord-

ance with local regulations. For further

details, contact place of purchase.

Storage

Seal container to keep out foreign

material. Store in dark place.

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TABLE OF CONTENTS

FOREWORD ................................................................................................................... v

SYSTEM CONFIGURATION................................................................................... vi

MENU TREE.................................................................................................................. vii

OPERATIONAL OVERVIEW

1.1 Control Description....................................................................................................... 1-1

1.2 Turning the Power On/Off ............................................................................................ 1-3

1.3 Adjusting Screen Brilliance, Panel Backlighting........................................................... 1-3

1.4 Lowering the Transducer ............................................................................................. 1-3

1.5 Presentation Mode ....................................................................................................... 1-4

1.6 Background Color ........................................................................................................ 1-6

1.7 Degaussing the Screen................................................................................................ 1-6

SONAR MODE

2.1 Typical Operating Procedure........................................................................................ 2-1

2.2 Selecting Range........................................................................................................... 2-2

2.3 Selecting Sector, Sector Stepping ............................................................................... 2-3

2.4 Setting the Tilt Angle .................................................................................................... 2-4

2.5 Adjusting Gain .............................................................................................................. 2-7

2.6 Rejecting Sonar Interference and Noise ...................................................................... 2-7

2.7 Detecting Fish Schools Aurally .................................................................................... 2-9

2.8 R/B and Event Markers (trackball operation) ............................................................. 2-10

2.9 Selecting Training Sector Quickly ...............................................................................2-11

2.10 Suppressing Bottom and Sea Surface Reflections in Shallow Fishing Grounds ......2-11

2.11 Suppressing Bottom Tail........................................................................................... 2-12

2.12 Displaying Surface Fish Clearly (TVG adjustment).................................................. 2-12

2.13 Relocating Fish School for Easy Observation.......................................................... 2-14

2.14 Finding Fish School Center...................................................................................... 2-14

2.15 Sonar Menu Operation............................................................................................. 2-15

2.16 E/S Menu ................................................................................................................. 2-16

2.17 Turning Trackline Plotting On/Off ............................................................................. 2-17

2.18 Interpreting the Display ............................................................................................ 2-18

2.19 Sonar Mode Indications ........................................................................................... 2-24

2.20 Application Example................................................................................................. 2-26

VERTICAL FAN MODE

3.1 Typical Operating Procedure........................................................................................ 3-1

3.2 Selecting Range........................................................................................................... 3-2

3.3 Selecting Bearing for the Vertical Fan.......................................................................... 3-3

3.4 Selecting the Display Sector ........................................................................................ 3-4

3.5 Automatic Shifting of Own Ship Position ...................................................................... 3-5

3.6 Rejecting Sonar Interference and Noise ...................................................................... 3-5

3.7 Horizontal, Vertical and Event Markers (trackball operation) ....................................... 3-6

3.8 Applying Proper TVG ................................................................................................... 3-7

iii

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3.9 Bottom/3D Menu Operation ......................................................................................... 3-8

3.10 Interpreting the Display .............................................................................................. 3-9

3.11 Vertical Fan Mode Indications .................................................................................. 3-12

3.12 How to Use the Vertical Fan Mode .......................................................................... 3-13

3D MODE

4.1 Selecting a 3D Display ................................................................................................. 4-1

4.2 Turning Vertical Echoes On/Off.................................................................................... 4-2

4.3 Changing 3D View Scale Mode and Scale Selection .................................................. 4-3

4.4 Other Operations.......................................................................................................... 4-3

CUSTOM MODE KEYS ( 1 , 2 , 3 )

5.1 About the Custom Mode Keys ..................................................................................... 5-1

5.2 Customizing the Keys .................................................................................................. 5-1

5.3 Custom Mode Operation .............................................................................................. 5-2

MENU SETTINGS

6.1 System Setting Menu ................................................................................................... 6-1

6.2 Screen Adjustment....................................................................................................... 6-2

6.3 System Menu ............................................................................................................... 6-4

6.4 Dual Menu.................................................................................................................... 6-9

MAINTENANCE & TROUBLESHOOTING

7.1 Maintenance of Display Unit ........................................................................................ 7-1

7.2 Maintenance of Transceiver Unit ................................................................................. 7-1

7.3 Maintenance of Hull Unit .............................................................................................. 7-2

7.4 Display Unit Test .......................................................................................................... 7-3

7.5 Train/Tilt Test ................................................................................................................ 7-5

7.6 Test Pattern .................................................................................................................. 7-6

7.7 Error Messages............................................................................................................ 7-6

7.8 Troubleshooting Table .................................................................................................. 7-9

CUSTOM MODE KEY LABELS .......................................................................AP-1

SPECIFICATIONS ..................................................................................................SP-1

INDEX .......................................................................................................................Index-1

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FOREWORD

Congratulations on your choice of the FURUNO CH-37 Color

Sector Scanning Sonar! We are confident that you will enjoy

many years of trouble-free operation with this fine piece of equip-

ment.

For over 40 years FURUNO Electric Company has enjoyed an

enviable reputation for quality and reliability throughout the

world. This dedication to excellence is furthered by our exten-

sive global network of agents and dealers.

The CH-37 is the newest addition to FURUNO’s CH family of

sonars. This new sonar is especially designed to provide faster

detection capability by sector scanning method and improved

operation by rotary controls and trackball. The sonar picture is

presented in 16 or 8 colors on a high resolution CRT. The ex-

cellent signal processing technique and improved receiver bring

you a clear and high-quality picture on a 15-inch screen.

We would appreciate feedback from you, the end-user, about

whether we are achieving our purpose.

Thank you for considering and purchasing FURUNO equip-

ment.

Features

• Multi sector scanning provides quick coverage of full 360°

area in just 8 transmissions.

• PPI operation can be selected for superior detection range

and bottom fish sounding.

• Custom mode keys provide desired sonar settings by one

key stroke.

• Selectable background color lessens eye fatigue in both

daytime and nighttime operations.

• Selection of frequencies - 60, 81, 113, 162 kHz.

• Trackball offers easy-to-use operation for marker settings.

• Quick training and quick raise/lower operation.

• Vertical mode presents a vertical section of underwater con-

ditions.

• 3D mode shows vertical echoes like a graphic track plotter.

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SYSTEM CONFIGURATION

OPTIONAL SUPPLY

STANDARD SUPPLY

DISPLAY UNIT

CH-370

LOUDSPEAKER

SC-05WR

REMOTE CONTROL BOX

CH-343

External

Interface

OP06-13

(Built-in)

External

Interface

OP06-13

(Built-in)

OP06-13

02S8040 6M

24-32V DC

External

Interface

OP06-14

(Built-in)

EXTERNAL

MONITOR

Clinormeter

BS-704

MOTION

SENSOR

MS-100

250V-DPYCYS-2

: Connector to fitted at installation

: Connector fitted at factory

: Crimp-on lug to be fitted at installation

NOTE 1: Two sets of rectifiers are necessary for AC mains.

NOTE 2: DC ship's mains only. For AC ship's mains, the power

is supplied directly from the rectifier unit to the trans-

ceiver unit.

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MENU TREE

TX RATE

SONAR

TX PULSE LENGTH

TX OUTPUT POWER

TX EXT SYNC

STABILIZER

COLOR

RES. COLOR

[MENU] key

BOTTOM/3D

TVG (LEVEL)

TVG (TIME)

BEAM WIDTH

AUTO TRAIN SECTOR

VERT. ECHO OVERLAY

3D VIEW SCALE

TIME SCALE

DUAL

DUAL MODE

NET MOUTH SHIFT

NET MOUTH WIDTH

NET MOUTH HEIGHT

NET DEPTH

HOR SCAN RATE

VERSCAN RATE

E/S

RANGE

SHIFT

GAIN

N.L.

ADVANCE SPEED

RES. COLOR

[PWR] key + [MENU] key

SYSTEM MENU

SYSTEM SETTING

3D DISPLAY

SHIP'S POSITION

CURRENT DATA

DEPTH DATA

RANGE - SONAR MODE

RANGE - VERTICAL FAN MODE

RANGE/SHIFT - E/S

COLOR

HEADING INDICATION

NORTH MARK

LANGUAGE

TRACK

HDG/SPD DATA

NAV DATA

DISPLAY TEST1 - ROM/RAM/KEY

TRAIN/TILT TEST

DATA FORMAT FOR NAV2

CIF BAUD RATE

TVG CORRECTION

UNIT

SCREEN ADJUSTMENT

TEST PATTERN

DISPLAY TEST2 - OPERATION

DEFAULT

V-MODEL MANUAL TRAIN

DEGAUSSING INTERVAL

FACTORY SETTING

vii

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This page is intentionally left blank.

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OPERATIONAL OVERVIEW

1.1 Control Description

Main panel

Switches on and off the entire system.

Controls the transducer. Each switch functions as follows:

: Raises the transducer.

: Lowers the transducer.

PWR

TRANSDUCER

Selects display mode (from left-hand position):

Normal Sonar Mode or Normal Sonar Mode + E/S Combination*

Expanded Sonar Mode

Vertical Fan Mode or Vertical Fan Mode + E/S Combination*

3D Display* (front perspective view)

MODE

RANGE

3D Display* (slant perspective view)

*: Optional supply

Selects the detecting (display) range. Turn clockwise to increase the

detection range. The selected range appears in large characters for a

few seconds and remains at the upper right corner of the screen.

TRAIN

GAIN

Determines the center bearing of the train sector. The selected bear-

ing appears by a large white mark on the bearing scale. In the

expanded sonar mode, it controls the direction to be off-centered (four

directions). In the vertical fan mode, it determines the bearing of the

vertical fan training.

TILT

R/B

SECTOR

FULL

HALF

EVENT

Adjusts the sensitivity of the receiver. Turning the control clockwise

increases the sensitivity. When changing the range and tilt settings,

readjust the sensitivity. For normal use, set it between 3 and 5.

In the sonar mode, it controls the tilt angle, between +5° and -90°. The

setting angle is set in 1-degree steps and appears at the upper right

corner of the screen. In the vertical fan mode, it determines the sector

center of vertical scanning.

In the sonar mode, it selects the width of the transducer training sector

among six positions (45°, 90°, 135°, 180°, 225°, and 360°). The direc-

tion of training can be made in both directions except at the 360° set-

ting. In the vertical fan mode, the sector widths are 36°, 60°, 96°, 120°,

156°, and 180°. FULL/HALF key switches the training sector or sector

width between full circle and half circle by single key stroke.

1 2 3

CUSTOM MODE ENTER

CH-37

The trackball moves the trackball marker (+). The trackball mark data,

that is, slant range, horizontal range, depth and bearing to the track-

ball marker, are always indicated on the screen. Additionally, this con-

trol positions the R/B (Range/Bearing) marker and sets the event

marker, with the R/B and the EVENT keys. The EVENT key displays

the event marker.

Provides user-defined sonar settings with a single key. The ENTER

key opens the custom mode key setting menu.

Figure 1-1 Main panel

1-1

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Sub panel

Function

TVG

Description

LEVEL controls the receiver sensitivity

to eliminate surface noise, which may

mask shallow targets. TIME determines

the TVG effective range.

Sub-panel 1

Rejects noise which appears on the

screen in light blue or blue. A setting

between 2 and 4 will suffice in most

cases.

LEVEL TIME

NL AUDIO

AUDIO

Adjusts the volume of the external loud-

speaker, which monitors target echoes.

TVG

DIMMER

BRILL

Adjusts panel backlighting.

Adjusts screen brilliance.

DIMMER BRILL

Function

Description

HUE

E/S DEGAUSS

HUE

Changes the background color of the

display in the sequence of deep blue,

blue, black.

FAST

SCAN

V:H

RANGE

TRACK

AUTO

TRAIN

BOTTOM MODE

E/S

Turns the E/S combination display

on/off. (Optional devices required.)

DEGAUSS

The screen is automatically degaussed

at the interval selected on the system

setting menu. To manually degauss the

screen press this key.

Sub-panel 2

FAST SCAN Changes the sector steps (45°/6° in

sonar mode and 6°/3° in vertical fan

mode).

TRACK

Turns the course line plotting on/off.

(Navigation equipment required.)

V:H RANGE Changes the horizontal range scale in

the vertical fan mode.

AUTO TRAIN Changes the auto and manual train in

the vertical fan mode.

Displays the menu screen of the mode

in use.

Figure 1-2 Sub panel 1 and sub panel 2

1-2

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1.2 Turning the Power On/Off

Power on

Press the PWR switch on the main panel. The lamp above the

switch lights to show that power is turned on.

Power off

Retract the transducer with the g key on the main panel. The

lamp above the switch lights while the transducer is being raised

and goes off when the transducer is fully raised. Then, press

the PWR switch.

Note: The transducer is automatically retracted into the tank

even if the PWR switch is pressed before retracting the

transducer. However, for safety purposes, make it a habit

to retract the transducer before turning off the power.

1.3 Adjusting Screen Brilliance, Panel Backlighting

The BRILL control adjusts screen brilliance and the DIMMER

controls adjusts panel backlighting. These controls are on the

sub panel 1.

1.4 Lowering the Transducer

Press the h switch on the main panel to lower the transducer.

The lamp above the switch blinks while the transducer is being

lowered and lights when the transducer is fully lowered.

CAUTION

Observe maximum allowable ship’s speed

of 18 knots during operation and 15 knots

while raising/lowering transducer, to prevent

damage to the transducer.

1-3

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1.5 Presentation Mode

Five presentation modes are available with the MODE control:

Normal sonar, Normal sonar + combination, Expanded sonar,

Vertical fan mode or Vertical fan mode + combination and 3D

display mode (front and slant perspective views).

Mode

Presentation

Normal sonar mode

Normal full circle picture appears on

the entire screen.

Normal sonar + E/S, vertical fan

or sonar

Normal full circle picture appears at

the upper 2/3 of the screen; the echo

sounder, vertical fan or sonar on the

lower 1/3. To select the picture to

display in the lower 1/3, see DUAL

MODE on page 6-9.

(Echo sounder required to display

echo sounder picture).

Expanded sonar mode

Zoomed picture appears on the

entire screen. The echo size on the

screen is expanded 1.5 times.

(Continued on next page)

1-4

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Mode

Presentation

Vertical fan mode

A vertical section of underwater

conditions (half-circle area) appears

on the entire screen.

Vertical fan mode + E/S or sonar

A vertical section of underwater

conditions (half-circle area) appears

on the upper 2/3 and echo sounder

or sonar picture on the lower

1/3. To select the picture to display

in the lower 1/3, see DUAL MODE

or page 6-9.

(Echo sounder required to display

echo sounder picture).

3D display (front perspective view)

The vertical contour line appears

historically (time or distance). Only

the latest echo is painted, like

the vertical mode presentation.

This mode may be turned on

in the SYSTEM menu.

3D display (slant perspective view)

Display contents are same as front

perspective mode except the per-

spective is different. This mode may

be turned on in the SYSTEM menu.

Note: Asterisk-marked modes require external signal interface

and external E/S interface. Furthermore the E/S key on

the sub panel 2 must be turned on.

1-5

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1.6 Background Color

The background color is available in deep blue, blue or black,

with the HUE key.

1.7 Degaussing the Screen

The screen is automatically degaussed at the interval selected

on the SYSTEM SETTING menu. However, when the picture

or picture color appears to be distorted, manually degauss the

screen with the DEGAUSS key.

1-6

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SONAR MODE

2.1 Typical Operating Procedure

PWR

TRANSDUCER

Turn on the display unit.

MODE

RANGE

Lower the transducer.

Adjust the brilliance of the CRT.

TRAIN

GAIN

Set the MODE knob to

position.

Select the range desired with the RANGE control.

TILT

R/B

SECTOR

Select the automatic training area and center position with the SEC-

TOR and TRAIN controls. The FULL/HALF key provides a quick

FULL

HALF

EVENT

change of the area (225°

360°).

Adjust the tilt angle with the TILT control. See page 2-3 through 2-5

for details.

Adjust the GAIN and TVG controls.

[Gain: 3-5, TVG (level & time): 3-5]

Adjust the NL control if a large number of small blue dots appear on

the screen. Normally set it between 2 and 4.

1 2 3

LEVEL TIME

NL AUDIO

TVG

With the trackball marker, measure the distance to a fish school or

the bottom.

CUSTOM MODE ENTER

DIMMER BRILL

CH-37

Reduce the output power if necessary. Normally, set it for maximum

position (C).

Turn off "FAST SCAN" mode if longer detection is required.

HUE

E/S DEGAUSS

FAST

SCAN

V:H

RANGE

TRACK

AUTO

TRAIN

BOTTOM MODE

Figure 2-1 Main panel and sub panel controls

2-1

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2.2 Selecting Range

The RANGE control selects the detection (display) range. Se-

lect the range according to either the fish species being

searched or the depth desired. Normally it is set so that the

bottom is traced at the lower part of the screen (like an echo

sounder).

SEA SURFACE

Range indicated

on the screen.

BOTTOM

Figure 2-2 Range selection

Table 2-1 Transducer frequency and range

Freq.

RANGE (m*)

60 kHz 50 100 150

81 kHz 60 100 150

113 kHz 50 100 150

600 800 1200 1600

500 1000

500 600

450 500

800 1200

800 1000

Range (m)

162 kHz

50 100 150

600

800

Note: Unit of range measurement may be changed through

the SYSTEM menu. For details see page 6-1.

2-2

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2.3 Selecting Sector, Sector Stepping

Sector width

Sector means the width of the transducer training. The SEC-

TOR control selects the training (display) area among six posi-

tions. In the full circle mode (360°) the direction of training is

clockwise only.

Table 2-2 Transducer training sector

Mode

Transducer Training Sector (display area)

45°, 90°, 135°, 180°, 225°* and 360°*

* Selected by FULL/HALF key.

Sonar mode

Sector center marker

Training sector

90°

Figure 2-3 Sector selection

Sector step

The FAST SCAN key in the sub panel 2 selects sector step in

45° or 6°.

2-3

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2.4 Setting the Tilt Angle

The tilt angle shows the direction to which the sound wave is

emitted. When the sound wave is emitted horizontally, the tilt

angle is said to be 0° and when emitted vertically, 90°.

To set a tilt angle, operate the TILT control. Watch the tilt angle

indication at the top right corner of the screen. The tilt angle

can be set in one-degree steps from -5° (upward) to 60° (down-

ward).

Finding a proper tilt angle is important when searching for fish.

Bottom echo and tilt angle

Case 1: Tilt angle 30° to 40°

This tilt angle will display the entire bottom since it is captured

by the full width of the beam.

Case 2: Tilt angle 10° to 20°

This tilt angle will only display half the bottom since it is only

captured by the lower half of the beam.

Case 3: Tilt angle 0° to 5°

This tilt angle may or may not capture the bottom since the

returning echo is weak.

How to discriminate fish echoes from the bottom

The figure at the top of the next page illustrates how two fish

schools a and b are displayed on the screen using three dif-

ferent tilt angles.

Case 1: Tilt angle 30° to 40°. Fish school is obscured by the

bottom.

Case 2: Tilt angle 10° to 20°. Fish school is located above the

bottom (midwater).

Case 3: Tilt angle 0° to 5°. Fish school is located close to the

bottom.

2-4

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Case 1

Case 3

Case 2

Fish School a

Fish school a

Bottom

Fish school b

Bottom

Fish school b

Case 1

Case 2

Case 3

Figure 2-4 Fish echo and tilt angle

Points to consider

• Normally, a vertically distributed fish school is a better sonar

target than the bottom, because it reflects the transmitted

pulse back toward the transducer.

• In case 3, both fish schools a and b are presented. Gener-

ally speaking, however, midwater fish schools tend to be

larger than bottom fish schools and they are often displayed

near the bottom on the display.

• It is difficult to detect bottom fish when they are not distrib-

uted vertically.

Tilt angle for surface fish

Sound emitted from the sonar transducer forms an oval-shaped

beam with a width of approximately 13° (for 60 kHz transducer)

in the vertical direction (vertical beam width). The tilt angle is

indicated by the angle between the center line of the beam and

the horizontal plane. Then, if the tilt angle is set to 0°, the cen-

ter line is parallel with the sea surface and one half of the emit-

ted sound goes upward, toward the sea surface.

This causes one half of the emitted sound to be reflected to-

ward the transducer and displayed on the screen as sea sur-

face reflections. When the sea is calm, since the sound is

reflected just like a light hitting a mirror at a narrow incident

angle, it propagates away and the sea surface reflections be-

come negligible.

2-5

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However if the sea is not calm enough, they will become domi-

nant and interfere with observation of wanted echoes. To mini-

mize these sea surface reflections and to search surface fish

schools effectively, the tilt angle is usually set between 5° and

6° so the upper portion of the beam becomes almost parallel

with the sea surface. When the sea is rough, it is often set to a

little larger angle.

Sea surface

Tilt angle 0°

11°

Sea surface

R400

T 15

Tilt

angle

Tilt angle 5-7°

11°

Figure 2-5 Tilt angle and sea surface reflections

Suitable tilt angle

The figure below illustrates the relationship among tilt angle,

depth and detection range. Refer to it to find out the suitable tilt

angle for a given depth/detection range.

Tilt angle and beam coverage (frequency, 60 kHz, vertical beamwidth, 13

Range (m)

400

(800)

100

200

300

(200)

(400)

(600)

20(40)

40(80)

60(120)

10°

15°

80(160)

100(200)

200(400)

300 m

Vertical width of sonar beam

200 m

100 m

68 m

13°

23 m

46 m

Figure 2-6 Tilt angle and beam coverage

2-6

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2.5 Adjusting Gain

Most equipment malfunctioning claims result from improper

setting of switches and controls. For example, fish, fish habitat

or outcrop can not be readily detected by merely increasing

the gain. Initially set the gain between 3 and 5 with the GAIN

control. Then, fine tune depending on the fishing ground, fre-

quency used, etc.

Turn GAIN control clockwise.

Adjust NL control.

Few fish found

or difficult to

find fish

Adjust TVG controls.

habitat.

CLEAR

PICTURE!

Turn on "IR" in SONAR menu.

Figure 2-7 How to set the gain

2.6 Rejecting Sonar Interference and Noise

While observing the sonar picture, you may encounter occa-

sional or intermittent noise and interference as shown below.

These are mostly caused by onboard electronic equipment,

engine, propeller noise, or electrical noise from other sonars

being operated nearby.

(A) Inteference from (B) Interference from

other sonars

marine life

Figure 2-8 Noise and interference

2-7

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Identifying noise source

To eliminate noise effectively, you should first identify the source

as follows:

• Operate all onboard equipment one by one while observing

the picture.

• Run the boat at various speeds to check if the noise is speed

dependent.

If neither of the above affects the picture, turn on “IR” in the

SONAR menu or adjust the NL (Noise Limiter) control as be-

low.

Rejecting noise with the interference rejector

This control is effective in rejecting random noise and sea sur-

face reflections in rough sea conditions. Pull the GAIN control

and adjust it to eliminate only noise. Reject the noise with “IR”

in the SONAR menu. Do not use an unnecessarily high setting

since it many also reject small wanted echoes.

Rejecting noise with NL control

Weak, unwanted reflections, colored light blue or green, ap-

pear when water is contaminated, or plankton layers or noise

exist. These echoes gradually become bluish as the NL control

is turned clockwise. Usually a setting from 3 to 4 provides suf-

ficient reduction.

Rejecting interference with Tx rate

When other sonars are operating nearby at the same trans-

mission interval as that of own ship’s sonar, interference caused

by other sonars appears. To reduce the interference, reduce

the Tx rate setting on the SONAR menu.

Note: When the sonar is used in shallow water with the range

set between 100 m and 200 m and the Tx rate at 10,

bottom reflections caused by the transmission which is

the last but one appear on near on screen. Reduce the

Tx rate to 7 or 8 to reject them.

2-8

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2.7 Detecting Fish Schools Aurally

Occasionally you will be preoccupied with other tasks and un-

able to concentrate on watching the sonar picture. In such cases

it would be a good choice to use the audio function. This func-

tion enables you to monitor echoes from fish schools and bot-

tom through the external speaker (option), of which the volume

can be adjusted with the AUDIO control on the sub panel 1.

After you become accustomed to utilizing the audio function,

you should be able to detect a fish school from a range longer

than you can detect it on the screen. In addition you may judge

whether the fish schools is approaching or going away; the

tone becomes higher when the fish is approaching and lower

when going away.

2-9

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2.8 R/B and Event Markers (trackball operation)

The trackball functions to obtain the data (slant & horizontal

range, depth and bearing) from own ship to the specified posi-

tion on the screen and, combined with the R/B and EVENT

keys, it switches the R/B and event markers on/off. With navi-

gation data input, the event marker moves with ship’s move-

ment.

Function

Procedures/Purpose

Trackball

Data

1) Position the trackball marker on the location desired.

Trackball data

Trackball marker

2) Read the trackball data displayed at the upper left corner

of the screen.

1) Position the trackball marker on the location desired.

Event

marker

Event marker

2) Press the EVENT key to inscribe the event marker.

3) To erase the marker, place the trackball marker outside

the echo display area and press the EVENT key.

Note: CH-37 stores one event marker.

R/B marker 1) Position the trackball marker on the location desired.

R/B marker

R/B marker data

2) Press the R/B key. The range and bearing markers

appear and their data appears at the bottom left-hand

side of the screen.

3) To erase the marker, place the marker near the own

ship position or outside the echo display area and

press the R/B key.

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2.9 Selecting Training Sector Quickly

Normally the training sector is selected by the SECTOR con-

trol. To the training sector more quickly, however, use the FULL/

HALF key. This key allows switching between full circle and

half circle training sector in a single key stroke.

FULL CIRCLE

HALF CIRCLE

FULL/HALF

key

SECTOR

Figure 2-9 How the SECTOR control and FULL/HALF key work

2.10 Suppressing Bottom and Sea Surface Reflections

in Shallow Fishing Grounds

In shallow fishing grounds, excessive sea surface and bottom

reflections often interfere with wanted fish echoes and they can-

not be eliminated sufficiently with the aforementioned TVG con-

trols. In such cases, try to reduce the output power from C to B

or A on the SONAR menu, without turning down the gain. The

picture becomes clearer when output power is reduced rather

than when the gain is decreased, as illustrated below.

2-11

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DIMMER BRILL

HUE

E/S DEGAUSS

FAST

SCAN

V:H

RANGE

TRACK

AUTO

TRAIN

BOTTOM MODE

: SONAR BOTTOM/3D

: 10

E/S

TX RATE

TX PULSE LENGTH : LONG

TX OUTPUT POWER :

SHORT

C(MAX)

Figure 2-10 How to reduce bottom and surface reflections by

reducing Tx output power

2.11 Suppressing Bottom Tail

As described earlier, fish schools near the bottom are some-

times difficult to detect because you have to discriminate fish

echoes from the bottom reflections. To discriminate fish echoes

near the bottom, select the short Tx pulse length on the SONAR

menu to decrease the tail of bottom reflection.

2.12 Displaying Surface Fish Clearly (TVG adjustment)

Echoes from targets (such as the bottom or a fish) return to the

transducer in order of the distance to them, and when their in-

tensities are compared at the transducer face, those from nearer

targets are generally stronger when their reflecting properties

are nearly equal. The sonar operator will be quite inconvenienced

if these echoes are directly displayed on the screen, since he

won’t be able to judge the actual size of the target from the size

of echoes displayed on the screen. To overcome this inconve-

nience, use the TVG function. It compensates for propagation

loss of sound in water: amplification of echoes on short range is

suppressed and gradually increased as range increases so that

similar targets are displayed in similar intensities irrespective of

the ranges to them.

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In the CH-37, the TVG LEVEL and TIME controls compensate

for propagation loss. The effective distance is up to 1000 m

approximately.

Without TVG function

Proper TVG setting

Nearer target

echoes appear

in larger size.

Echoes of equal

size targets are

presented in the

same color and size.

Noise is rejected.

Reduce

gain for

nearby

areas,

using

Noise caused by

strong reflection

of surface

turbulence.

TVG.

Position

TVG Range

0 m

60 m

130 m

300 m

1000 m

LEVEL TIME

TVG

Figure 2-11 How to adjust TVG

The TVG also functions to suppress unwanted echoes and noise

which appear in a certain range area on the screen as shown

in the figure above.

To adjust the TVG;

1. Set TVG time between 3 and 5 (approx. 130-300 m). This

is the standard setting and you can maintain it in most cases.

2. When sea surface reflections or plankton layers disturb the

picture, set the TVG level control around 5 to eliminate them.

3. Locate a fish school on a long range setting which is ap-

proaching your vessel.Adjust the tilt to keep the fish school

in the center of the sonar beam. Check that the fish echo

appears in the same color while it approaches. If the color

changes suddenly to weaker colors as the fish echo nears,

the TVG is improperly set.Adjust the TVG level to correct it.

If sea surface reflections and noise remain, try to remove

them with the interference rejector (“IR” on the SONAR

menu) and NL control as described on page 2-8.

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2.13 Relocating Fish School for Easy Observation

When a fish school is near the edge of the screen and inconve-

nient for observation, use the “ ” expanded sonar mode and

adjust the TRAIN control (off-center function) to relocate the

fish school close to the screen center.

Fish school

Fish

school

Own ship

Figure 2-12 How to relocate fish school

2.14 Finding Fish School Center

When you want to find the center depth of a fish school, change

the tilt angle and observe the presentation as follows:

1. Select a narrow sector range (45°) and capture the target

echoes.

2. Adjust the tilt angle with the TILT control slowly and ob-

serve the change of the presentation color.

3. The echo presented in the strongest color is the center of

the fish school.

R 800

RANGE

TILT

Tilt

setting

T 8°

Figure 2-13 How to find fish school center

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2.15 Sonar Menu Operation

Operating procedure

1. Press the MENU key on the sub panel 2.

2. Select the SONAR menu with the arrow keys on the sub

panel 2.

: SONAR BOTTOM/3D DUAL E/S

TX RATE

TX PULSE LENGTH : LONG

SHORT

TX OUTPUT POWER :

C(MAX)

TX EXT SYNC

OFF

STABILIZER

COLOR

RES. COLOR

EXIT

LOG

LINEAR

SQUARE

: PRESS MENU KEY

Figure 2-14 Sonar menu

3. Select item and setting with the arrow keys. The selected

item is highlighted and the current setting is circumscribed

in white.

4. To turn off the menu, press the MENU key again.

Sonar menu description

TX RATE: Selects transmission repetition rate in ten steps. “1”

is the longest interval; “10” the shortest. Set to “10” for normal

use.

TX PULSE LENGTH: Selects Tx pulselength to “LONG” or

“SHORT.” The pulselength is adjusted automatically according

to the range setting in “LONG” or “SHORT” position. Set to

“LONG” for normal use.

TX OUTPUT POWER: Adjusts output power; “A” is for mini-

mum power and “C,” maximum. Set to “C” for normal use, and

use a low power when sea surface reflections or bottom echo

obscures fish schools.

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TX EXT SYNC: If two or more echo sounders or sonars are

operated simultaneously, mutual interference may result due

to asynchronous keying pulse output. To synchronize keying

pulse turn TX EXT SYNC on.

IR: Rejects interference. Turn off when no interference exists,

otherwise weak echoes may be missed.

STABILIZER: Select “ON” when the Motion Sensor MS-100

(option) is connected.

COLOR: Selects 16- or 8-color presentation.

RES COLOR: Sets echo presentation characteristics. LOG

enhances weak echoes and is normally used. LINEAR

downplays the weak echoes comparing with LOG. It is effec-

tive for suppressing the plankton layer. SQUARE enhances the

strong echoes comparing with LINEAR, resulting in clear and

easy-reading picture.

2.16 E/S Menu

1. Press the MENU key.

2. Select E/S at the top of the screen.

MENU:

SONAR

BOTTOM/3D

DUAL

E/S

160

RANGE

240

320

SHIFT

GAIN

N.L

5.0

OFF

1/1

LOG

1/2

ADVANCE SPEED

1/4

RES. COLOR

LINEAR

EXIT PRESS MENU KEY

Default settings circumscribed.

Figure 2-15 E/S menu

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Table 2-1 E/S menu description

Item

Description

RANGE

SHIFT

GAIN

N.L.

Selects echosounder range: 40, 80, 160, 240 or 320 (meters).

Enter display startting depth.

Adjusts gain.

Suppresses noise which covers the whole screen. Normally, set to 1 or 2.

Suppresses interfernce from sonar of other ship or noise from electrical

machinery onboard own ship.

Selects picture advance speed. The fractions the number of scan lines

produced per transmission.

ADVANCE SPEED

RES. COLOR

Select "LOG" or "LINEAR" according to amplifier of echo sounder.

LINEAR: FCV-382, 782, 271

LOG: FCV-291, 292. 1000

2.17 Turning Trackline Plotting On/Off

With navigation data input, the CH-37 can plot ship’s track on

the sonar mode display. The track itself can be turned on/off

with the TRACK key.

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2.18 Interpreting the Display

This section provides the information necessary for interpret-

ing the display.

How the picture is painted

The wide sounding beam is emitted from the soundome at a

certain tilt angle (see hatched area in the figure below). The

information (target echoes) obtained by this beam is displayed

in 45° sector of the screen. Thus, all directions around the boat

are s ounded in 8 times of transmissions.

Note: When the “FAST SCAN” is switched off, the equipment

operates in a narrow sounding beam. Then, the echoes

appear on a 6° sector in each transmission, so 60 times

of transmissions are required to complete full 360° pic-

ture (6° x 60 = 360°). This means that sounding speed

reduces. However, since transmission power is concen-

trated into the narrow sounding beam, a superior detec-

tion range is obtained. Furthermore, since the bottom

contour is painted distinctly, bottom fish detection may

become easier.

Sounding Beam

Screen Display

Freq: 60 kHz

45°*

Tilt:θ

60°/16°

Tilt θ

13°

Sounding

Beam

16°

13°

When the narrow sounding beam (6-degree step operation) is selected, 60 transmissions

are required to complete the full circle detection.

Figure 2-16 How the picture is painted

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Bottom echoes

When the tilt angle is widened, the bottom echo illustrated be-

low will appear on the display. When the tilt is narrowed, the

bottom trace becomes wider and weaker. By observing the

bottom condition on the display, the skipper can prevent net

damage.

(A) Flat bottom

Tilt angle: 10° to 15°

Narrow tilt angle

Only half of

vertical beam width

captures the bottom.

(B) Flat bottom

Tilt angle: 20° or more

Bottom is displayed

narrower and in

stronger colors when

compared to (A).

Tilt angle: 20° or more

Shallow bottom

is displayed in

a strong color

and with a

short tail.

Bottom

The deeper bottom

echo is displayed in

a weak color and

with a long tail.

Figure 2-17 Bottom echoes

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Fish schools

A fish school appears as a mass of echoes on the screen. The

color of the mass shows the density of fish schools on the so-

nar beam. To find distribution and center point of a fish school,

try several different tilt angles.

(A) Sea surface fish

Tilt angle: -5° to 10°

Bottom echo not

Fish

school

displayed because

of narrow tilt angle.

Sea surface

reflections are

present.

Sea surface

reflections

(B) Midwater, bottom fish Tilt angle: 30° or more

Fish echo which appears before bottom can be detected.

Bottom

Fish

school

Large midwater

fish school is

present.

Tilt angle: -0° to 20°

Fish echo which appears together with

or after bottom can be detected.

Fish

school

Bottom

When the tilt angle is shallow,

he reflection echo from bottom

is weak and the fish echo

which appears from bottom

is easy to find.

Figure 2-18 Fish schools

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Sea surface reflections

To reduce sea surface reflections, set the tilt angle to 5° or

higher, so the upper edge of the sonar beam does not hit the

sea surface, or adjust TVG. When a narrow tilt angle is used,

sea surface reflections cover a large area as illustrated below.

Sea surface

Tilt angle

indication

15°

Sea surface

reflections

Sea surface

15°

Figure 2-19 Sea surface reflections

Wake

A wake produced by own ship or another ship can be a strong

reflecting object when a narrow tilt angle is used. As the wake

appears as a thick continuous line, it can be easily distinguished

from a fish school. A wake contains many air bubbles which

attenuate ultrasonic energy, making it difficult to sound beyond

the wake.

Other

ship

Own

ship

Own ship’s

screw noise

Wake produced

by other ship

Own ship’s wake

(produced when

own ship turned)

Own ship’s

screw noise

Figure 2-20 Wake appearance on the display

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False echo by sidelobe

An ultrasonic wave is emitted only in the direction set by the

TILT control, however there are some emissions outside the

main beam. These are called sidelobes. The energy of the

sidelobe is fairly weak but when the water is comparatively

shallow and the bottom is rocky and hard, strong signals are

detected by the sidelobe. These are represented on the dis-

play as a false echo as shown below.

Mainlobe echo

Sidelobe echo

Mainlobe

Sidelobe

The bottom echo

detected by sidelobe

appears at a certain

tilt angle when the

sidelobe points ver-

tically. Also, poor

soundome projection

may result in a similar

false echo.

Figure 2-21 Sidelobe echoes

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Noise and interference

When the fishing ground is crowded with many fishing boats,

the sonar is subject to interference from ultrasonic equipment

(echo sounder or sonar) on other boats as well as those on

own ship.

For instance, interference from the sonar operated on other

boats will show itself on the display as in (A) in the figure be-

low. This interference can be suppressed by changing the Tx

rate on the SONAR menu. Noise from marine life shows itself

on the displays as in (B) in the figure below. This type of noise

can be suppressed with ”IR” in the SONAR menu.

(A) Inteference from (B) Interference from

other sonars

marine life

Figure 2-22 Noise and interference

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2.19 Sonar Mode Indications

Normal sonar display

Heading*

Sector center marker

Range

Tilt

Trackball marker

data

320°

Bearing

scale

North

marker*

Range

marker

Current (tide)

vector

Fish school

Own ship

marker

Trackball

marker

Bottom

echo

Bearing

marker

Courseline

(Requires

navigator or

current

→ 39

C1: 0.9

C2: 0.8

C3: 0.5

→

D35.0

indicator)

Range and bearing

marker data

↓

34° 43.261N

135° 20.282E

B 228°

Depth, latitude, longitude

(Requires navigator)

Current data

(Requires

current

indicator)

*: Heading, north marker require current indicator

and gyro or log.

Figure 2-23 Indications on the normal sonar display

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Expanded sonar display

Sector center marker

Range

Tilt

R 150

T 10°

Trackball marker

data

Sector width

marker

Own ship

marker

Trackball

marker

Figure 2-24 Indications on the expanded sonar display

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2.20 Application Example

The figure below shows a typical sonar mode application.

Sonar (Horizontal) Mode

PURSE SEINING

3 Search for fish school

with RANGE and TILT

controls.

PWR

TRANSDUCER

1 Power ON.

2 Lower soundome.

Go to 4 on

next page.

MODE

RANGE

PWR

TRANSDUCER

TRAIN

GAIN

MODE

RANGE

After blinking, remains lit.

GAIN

: "3~5"

NOISE LIMITER : "2~4"

TVG(level & time): "3~5"

BOTTOM TRAWLING

TX POWER

: C

Use these settings initially.

"Fine tune" as necessary.

1 Power ON.

2 Lower soundome.

3 Observe bottom on the

screen.

Bottom

PWR

TRANSDUCER

Go to 4 on

next page.

MODE

RANGE

After blinking, remains lit.

Select the proper range and

tilt angle.

For bottom trawling, sonar is usually used to detect net hangs ahead

rather than to detect fish close to the bottom, since bottom returns

usually mask the weaker fish targets close to the bottom. If the fish

school is dense enough and off the bottom they can be detected by

sonar.

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5 Change tilt angle for

strongest fish school

echo.

6 Monitor situation of both

fish school and net.

Fish

school

Fish

school

Scout-boat

Bottom

Here comes

fish school !

Net

4 Narrow the train area, and

track fish school.

Fish

school

Trackball

marker

5 Observe movement of fish

6 Set net around fish

Data for fish school pointed

by trackball marker (+).

school and scout-boat.

school.

Fish

school

Scout-

boat

TRAIN

GAIN

Net-boat

SECTOR

TILT

R/B

FULL

HALF

EVENT

Adjust tilt angle and observe

both screens.

Observe the net and the fish

school in it.

FULL

HALF

EVENT

R/B

Marker can be

moved to any

position by ro-

tating trackball.

SECTOR

FULL

HALF

EVENT

5 Expand historical display

6 Change tilt angle, and tow

4 Narrow the train area, and

and observe bottom.

net.

track fish school.

Bottom

Fish

school

Fish

school

Outcrop

Trackball

marker

Data of fish school, bottom

or outcrop pointed by trackball

marker.

Here comes

fish school !

Outcrop !!

DO NOT FORGET TO RETRACT THE SOUNDOME

BEFORE TURNING OFF THE POWER !!

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VERTICAL FAN MODE

3.1 Typical Operating Procedure

Turn on the display unit.

Lower the transducer.

PWR

Adjust the contrast and brilliance of the CRT.

TRANSDUCER

Set the MODE control to

position.

MODE

RANGE

Select the range desired with the RANGE control.

Select the bearing of the vertical scanning with the TRAIN control.

Determine the center direction of the vertical scanning sector with

the TILT control and select the sector width with the SECTOR con-

trol.

TRAIN

GAIN

Select the auto train sector on BOTTOM/3D menu, if necessary.

TILT

R/B

SECTOR

Adjust the GAIN and TVG on the BOTTOM/3D menu ([Gain: 3-5,

TVG (level & time): 3]).

FULL

HALF

EVENT

Adjust the NL control if a large number of small blue dots appear on

the screen. Normally set it between 2 and 4.

With the trackball marker, measure the horizontal or vertical distance

to a fish school or the bottom.

Reduce the output power if necessary. Normally, set it for maximum

position (C).

1 2

LEVEL TIME

NL AUDIO

The FULL/HALF key provides a quick change of the sector (120° or

180°).

TVG

CUSTOM MODE ENTER

DIMMER BRILL

CH-37

HUE

E/S DEGAUSS

FAST

SCAN

V:H

RANGE

TRACK

AUTO

TRAIN

BOTTOM MODE

Figure 3-1 Main panel and sub panel controls

3-1

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3.2 Selecting Range

The RANGE control selects the detection (display) range. Se-

lect the range according to either the fish species being

searched or the depth desired. Normally it is set so that the

bottom is traced at the lower part of the screen (like an echo

sounder).

STBD 60

60 PORT

Surface

Horizontal

range

RANGE m

Bottom

Vertical

range

(V:H=1:1)

RANGE

Range (m)

20 40 60

280 320 400

Note: The unit of range measurement can be changed through

the SYSTEM menu. For details see page 6-1.

Figure 3-2 How to select range

V:H RANGE key

The V:H RANGE key changes the horizontal range scale in

two steps. See the figures below.

V:H=1:1

V:H=1:2

Figure 3-3 How the V:H RANGE key works

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3.3 Selecting Bearing for the Vertical Fan

The TRAIN control determines the bearing of the vertical fan

beam. To which bearing the beam positions is known by the

train indicator mark.

Train Indicator Mark

Training of Vertical Fan Beam

Bow

TRAIN

The training of the fan beam depends on the status of theAUTO

TRAIN key in the sub panel 2.

Train Indicator Mark

AUTO TRAIN [Example]

Training of Vertical Fan Beam

Bow

[on]

Auto Train Sector: 90°

[The beam

trains auto-

matically with-

in the selected

range cen-

(LED lights.)

tered at the

bearing set by

the TRAIN

control.]

AUTO TRAIN

[off]

Bow

(Manual train)

(LED goes

off.)

[The TRAIN control

can rotate the fan

beam to any bearing

desired. See V-MODE

MANUAL TRAIN on

page 6-2.]

Manual train range can

be selected either HALF

(174°) or FULL (360°)

on the SYSTEM menu.

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3.4 Selecting the Display Sector

Sector center, width

The SECTOR and the TILT controls determine the display area

(sector width) and the display center (sector center) respec-

tively.

Mode

Display Sector (transducer tilting sector)

36° 60° 96° 120°* 156°*/180°*

* Selected by FULL/HALF key.

Vertical Fan Mode

PORT

STBD

Display

sector

0°

(Shaded area)

180°

Sector center

Figure 3-4 Selecting the display sector

Sector step

The FAST SCAN key in the sub panel 2 selects sector step in

6° or 3°.

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3.5 Automatic Shifting of Own Ship Position

Own ship position on the screen is shifted automatically either

rightward or leftward according to the direction of the sector

center and the display sector width.

The figure below shows the own ship position has been shifted

rightward on the screen to provide the wider view at port side.

Display

sector

Sector

center

Figure 3-5 Automatic shift function

3.6 Rejecting Sonar Interference and Noise

While observing the picture, you may encounter occasional or

intermittent noise and interference as shown below. This is

mostly caused by onboard electronic equipment, engine, pro-

peller noise, or electrical noise from other sonars being oper-

ated nearby. Turn on the interference rejector (IR) in the SONAR

menu to reduce or eliminate the interference.

Figure 3-6 Interference and noise

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3.7 Horizontal, Vertical and Event Markers

(trackball operation)

The trackball functions to obtain the data (horizontal range and

depth) from own ship to the specified position on the screen

and, combined with the R/B and EVENT keys, switches the

Horizontal, Vertical and Event markers on/off.

1) Position the trackball marker on the desired location.

Event

marker*

Event marker*

Echo display area

2) Press the EVENT key.

3) To erase the marker, place the trackball marker outside

the echo display area and press the EVENT key.

Note: CH-37 stores one event marker.

Horizontal

and Vertical

markers

Vertical marker

Horizontal marker

Distance to the intersection

of the markers.

1) Position the trackball marker on the desired location.

2) Press the R/B key. The horizontal and vertical markers

appear and the distance to the intersection of the mark-

ers is indicated at the bottom left-hand side of the

screen.

3) To erase the marker, place the marker outside the echo

display area and press the R/B key.

* Requires navigation data.

(Continued on next page)

3-6

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Function

Procedure/Purpose

Trackball

Data

Horizontal Range

Depth

Trackball data

Trackball marker

1) Position the trackball marker on the desired location.

2) Read the trackball data displayed at the upper left corner

of the screen.

3.8 Applying Proper TVG

The TVG function is the same as the one explained in the so-

nar mode. For best results, set both TVG level and time a little

lower than the ones in the sonar mode. The setting is mode on

the BOTTOM/3D menu screen and the usual setting for both

time and level is 3.

: SONAR BOTTOM/3D

DUAL E/S

TVG LEVEL

TVG TIME

BEAM WIDTH

3.0

NAR

Figure 3-7 Bottom/3D menu screen

TVG level rejects surface noise, which may mask shallow tar-

gets and TVG time adjusts the effective depth.

Level too low

Proper

Level too high

Time to high

Figure 3-8 Examples of proper and improper TVG

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3.9 Bottom/3D Menu Operation

Basic procedure

1. Press the MENU key on the sub panel 2.

2. Select BOTTOM/3D with the arrow keys in the sub panel 2.

3. Select item and setting with the arrow keys. The selected

item is highlighted and the current setting is circumscribed

in white.

4. To return to the BOTTOM/3D menu, press the menu key

again.

: SONAR BOTTOM/3D

DUAL

E/S

TVG (LEVEL)

TVG (TIME)

3.0

BEAM WIDTH

AUTO TRAIN SECTOR

VERT. ECHO OVERLAY

3D VIEW SCALE

TIME SCALE

NAR

WIDE

180

360

1/4

OFF

TIME

1/1

DIST

1/2

(or DISTANCE SCALE

EXIT

500

1000)

: PRESS MENU KEY

Figure 3-9 Bottom/3D menu

Bottom/3D menu description

TVG (Level): Controls the receiver sensitivity in short to me-

dium ranges to eliminate surface noise, which may mask shal-

low targets.

TVG (Time): Determines the TVG effective depth.

BEAM WIDTH: Sets the vertical beam width. Select narrow for

general use. The wide beam width is useful for searching a

wide area vertically but fish detection range is shortened since

the transmitted power attenuates.

AUTO TRAIN SECTOR: Sets the train sector; 90°, 180°, or

360°. Use a wide sector to conduct a general search, narrow-

ing it once a fish school is detected.

VERT. ECHO OVERLAY: Turns the E/S combination display

on/off. (Requires external E/S.)

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3D VIEW SCALE: Determines the depth item, time or distance

for 3D display mode. (Requires optional equipment.)

TIME SCALE or DISTANCE SCALE: Selects z-axis scale of

3D picture.

3.10 Interpreting the Display

This section provides the information necessary for interpret-

ing the display.

How the picture is painted

The sounding beam is emitted and the information (target ech-

oes) obtained by the beam appears in the corresponding sec-

tor as it appears on the sonar mode. The difference is that the

training is performed only in vertical direction. It forms a sound-

ing area of a half-circle (like a slice of watermelon) to observe

a vertical section of underwater conditions.

The bearing of the vertical sounding beam can be selected

manually or automatically.

Sounding Beam

Screen Display

Freq: 60 kHz

Vertical

Fan

Mode

(1) Bearing of the

sounding beam

0°

Bow

180°

16°

180°

0°

13°

Tilting direction

(2) Sector center

13°

(3) Display area

(2) Sector center

(3) Display area

Select the bearing of the sounding beam (1) by TRAIN

control, the sounding sector center (2) by the TILT control

and the display area (3) by the SECTOR control.

Figure 3-10 How the vertical fan picture is painted

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Port-starboard picture (bottom)

You can see fish echoes at the center-right of the CRT. The

bottom is displayed wider as the distance from the ship’s posi-

tion increases. Therefore, it may be difficult to discriminate bot-

tom fish.

Own ship

PORT

STBD

Fish

school

Bottom

Figure 3-11 Port-starboard picture

When ship passes over fish schools

The sounding beam is directed fore-aft and the display is off-

centered* to present a wider view of the area forward of the

ship. You can clearly see fish schools approaching from the

bow of the ship.

*: Automatically shifted according to the operation control set-

tings.

Forward

FORE

Own ship

AFT

Fish school

AFT

FORE

Fish

school

Figure 3-12 Picture appearance when passing over fish schools

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Display of net hauling

This is an example of net hauling display. The location of the

net is indicated clearly. (Ship is stopped.)

Own ship

FORE

Backward

AFT

Net

Figure 3-13 Net hauling and sonar picture

False echo

In a shallow water (less than 100 m) detection, unwanted ech-

oes shown in the figure may appear. This phenomenon is

caused by the false echo from the previous transmission. Re-

ducing the Tx rate on the BOTTOM/3D menu may lessen this

effect.

Fish

Bottom

False echo

Range

Figure 3-14 False echoes

TIP! Training indicator and screen display.

Starboard-port

PORT STBD

Fore-aft

FORE

Aft-fore

FORE

AFT

¡Shows starting position of the sounding beam.

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3.11 Vertical Fan Mode Indications

Heading

Train indicator

H-Range

V-Range

Trackball

data

H-Range

scale

Fish schools

Net mouth

mark

Trackball

Bottom

2nd reflection

V-Range scale

Vertical/Horizontal

marker data

Figure 3-15 Indications in the vertical fan mode

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3.12 How to Use the Vertical Fan Mode

[1] TRAWLER (Surface/Mid-water/Bottom)

Usage

Fish school detection

Bottom shape discrimination

Relation between fish school and fishing gear

Turn on the AUTO TRAIN key on the sub panel 2 and set the

direction of the train center to the fore-aft direction. Observe

the fish school near the bow of the ship, or inspect the bot-

tom contour.

Auto train

Fish

schools

Shoal

2 After detecting a fish school, steer the boat toward that

direction, turning off the "AUTO TRAIN" to observe that

direction.

Bow

Steered

angle

3 When approaching the fish school, change the beam direc-

tion to port-starboard by the TRAIN control and maneuver

the boat so that the fish are led into the trawl net.

To observe the hauling of the net, turn the sounding beam to

the fore-aft direction.

Net

Figure 3-16 Vertical fan mode usage in trawling

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[2] PURSE SEINER

Usage

Tracking fish

Observation of fish movement/bottom shape

Confirmation of net forming

Approach the fish school while observing their distribution on

the sonar mode.

While approaching, face the sounding beam toward the fish

schools and confirm their distribution. The display shown

below is off-centered* to obtain a wider view of the starboard

side.

Fish

school

*Automatically shifted.

Shoot the net, and then observe the location of the fish and

the status of the net.

Fish

school

Net

Figure 3-17 Vertical fan mode usage on purse seiner

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3D MODE

The 3D mode shows vertical echoes (real time echoes) and a

frontal or oblique image of the bottom just passed, like a graphic

track plotter. This mode is useful for locating a wreck, a shoal

or a fishing reef. Vertical echoes can be turned on/off through

the BOTTOM/3D menu.

4.1 Selecting a 3D Display

Either of two displays may be selected with the MODE control:

the frontal image at “ ” position, or the oblique image at “ ”.

Example displays of both images are shown below.

Frontal image

The frontal image picture gives a view of the bottom as if you

are looking at it through a rearview mirror. That is, the most

recent data appears at the front if the picture.

Train indication

Heading

H-range

V-range

H-range scale

Trackball

data

Vertical echoes

(real-time echoes)

Figure 4-1 Frontal image

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Oblique image

The oblique image is the equivalent of the frontal image ro-

tated by 45° counterclockwise.

Own position

Sectional

view

Figure 4-2 Oblique image

4.2 Turning Vertical Echoes On/Off

Vertical echoes, namely, real time echoes, can be turned on or

off on the VERT. ECHO OVERLAY field of the BOTTOM/3D

menu, which you can display by pressing the MENU key on

the sub panel 2.

: SONAR BOTTOM/3D

DUAL E/S

VERT. ECHO OVERLAY

3D VIEW SCALE

TIME SCALE

OFF

TIM

1/1

DIST

1/2

1/4

(or DISTANCE SCALE 500

EXIT

1000)

: PRESS MENU KEY

Figure 4-3 Bottom/3D menu

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4.3 Changing 3D View Scale Mode and Scale Selection

The depth (z-axis) of the graph is displayed in either “TIMe” or

“DISTance” scale mode. The depth can be set to 500 or 1000

meters in the distance scale mode, or 1/1, 1/2 or 1/4 in the time

scale mode. The fraction means graph update/number of trans-

mission. “1/4,” for example, means the graph is updated every

four transmissions.

These selections are made on the 3D VIEW SCALE and TIME

SCALE (or DISTANCE SCALE) lines of the BOTTOM/3D menu.

The time mode should be selected when speed data is not

being fed to the unit from navaids or speed log.

Depth

Oblique image

Frontal image

Figure 4-4 Depth dimension in frontal and oblique images

4.4 Other Operations

The following operations are the same as those in the Vertical

Fan mode.

• Range Selection

• Rejecting Sonar Interference and Noise

• Horizontal, Vertical and Event markers

• TVG Adjustment

• Beam Width Selection

The selection of the bearing of the vertical fan beam and auto

train function are disabled, as the bearing of the vertical fan

beam is automatically selected to 90° in this mode.

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CUSTOM MODE KEYS (¡, ™, £)

5.1 About the Custom Mode Keys

Like the redial feature on a telephone, the custom mode keys

record control settings and play them back in a single key stroke.

This feature is useful when you need to quickly set up the so-

nar according to fishing ground or fish species being searched.

You can program three sets of settings for the MODE, RANGE,

SECTOR, TRAIN and TILT controls.

5.2 Customizing the Keys

1. Tune the sonar as you normally would.

2. Press the ENTER key to display the CUSTOM MODE menu.

3. Press one of ¡, ™ or £ key (contents shown in second

column from the left in figure below).

[CUSTOM MODE menu]

ITEM

SETTING CUSTOM1 CUSTOM2 CUSTOM3

MODE

RANGE

SECTOR

TRAIN

TILT

FAST

0°

180°

96°

4. Repeat step (2) for remaining custom mode keys.

Note: Custom mode key labels are provided on page AP-1.

Cut them out and insert them in the label cases on the

front panel. See the illustration on the next page for how

to insert them.

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5.3 Custom Mode Operation

1. Press desired custom mode key ¡, ™ or £.

2. To escape from the custom mode settings, adjust any con-

trols.

[Example]

FISHING GROUND

TILT

R/B

SECTOR

FULL

HALF

EVENT

MODE

Fold here

RANGE 200 m RANGE 100 m RANGE

SECTOR 360° SECTOR 180° SECTOR

TRAIN

TILT

0° TRAIN

30° TILT

90° TRAIN

90° TILT

1 2 3

CUSTOM MODE ENTER

CH-37

Record settings on label and insert

it in label case on front panel.

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MENU SETTINGS

6.1 System Setting Menu

1. Turn on the power while pressing the MENU key. Release

the key when you hear a beep. The SYSTEM menu ap-

pears.

** SYSTEM SETTING **

3D DISPLAY

OFF

10R

NAV

GPS

NMEA

1200

OFF

HALF

30 SEC

L/L

SHIP’S POSITION

CURRENT DATA

DEPTH DATA

HEADING INDICATION

NORTH MARK

TRACK

LOP

FLOW FROM FLOW TO

TRUE

20R

LORAN C

DECCA

CIF

2400

1/2

HDG/SPD DATA

NAV DATA

LORAN A

OTHERS

DATA FORMAT FOR NAV2

CIF BAUD RATE

TVG CORRECTION

UNIT

V-MODE MANUAL TRAIN

DEGAUSSING INTERVAL

FACTORY SETTING

4800

HIRO

FULL

YES

EXIT : PRESS MENU KEY

Default settings circumscribed.

Figure 6-1 SYSTEM SETTING menu

2. Select SYSTEM SETTING and press the MENU key.

3. Select items with up and down arrow keys; options with left

and right arrow keys.

4. Press the MENU key to return to the system menu.

Note: Be sure to return to the system menu before turning

off the power, to properly register settings.

5. To return to normal operation, reset the power.

See the next page for SYSTEM SETTING menu description.

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Table 6-1 System setting menu description

Item

3D DISPLAY

Description

Turns 3D display on/off.

Turns position indication on/off and selects position format; latitude

and longitude or Loran LOP.

SHIP'S POSITION

CURRENT DATA

HEADING DISPLAY

NORTH MARK

TRACK

Turns current (tide) data display method; flow from, flow to or off.

Turns heading indication on/off and selects its format; true or

azimuth.

Turns north marker on/off.

Selects length of courseline plotting; 10R (ten times the range in use)

or 20R (twenty times the range in use).

Selects source of data to be used to plot courseline; NAV (Navigator),

CI (Current Indicator).

HDG/SPD DATA

NAV DATA

Selects source of position data; GPS, LORAN C LORAN A, DR,

DECCA, OTHERS.

DATA FORMAT FOR NAV2 Selects data format for nav data; CIF (FURUNO) or NMEA.

CIF BAUD RATE

Selects baud rate of CIF data; 1200, 2400, 4800 bps.

Changes TVG curve to compensate for absorption attenuation of

ultrasonic wave in water. OFF, Standard TVG curve, 1/2, 1/2 of

theoretical absorption value added to TVG curve, 1, Full theoretical

absorption value added to TVG curve.

TVG CORRECTION

Selects unit of depth measurement. m, meters; ft, feet; fa, fathoms,

HIRO.

UNIT

Selects manual training sector width for the Vertical Fan mode. Half,

half circle, Full, full circle.

V-MODE MANUAL TRAIN

DEGAUSSING INTERVAL

FACTORY SETTING

Selects screen degaussing interval.

Yes restores default system menu settings.

6.2 Screen Adjustment

Screen size and position can be adjusted as follows:

1. Turn on the power while pressing the MENU key to display

the SYSTEM menu.

2. Select SCREEN ADJUSTMENT.

3. Press the MENU key.

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** SCREEN ADJUSTMENT **

H.SIZE

H. POSITION

V. SIZE

V. POSITION

DEFLECTION DIST.

BRIGHTNESS

EXIT : PRESS MENU KEY

Effective picture

marker (inside)

Effective picture

marker (outside)

Figure 6-2 Screen adjustment screen

4. Select item with up and down arrow keys.

5. Adjust item with left and right arrow keys:

H.SIZE:

Sets picture size in horizontal direc-

tion. [→], increases size; [←], de-

creases size.

H. POSITION:

V.SIZE:

Adjusts picture position in horizontal

direction. [→], [←] shift right, left,

respectively.

Sets picture size in vertical direc-

tion. [→], increases size; [←], de-

creases size.

V. POSITION:

Adjusts pictureposition in vertical

direction. [→], [←] shift right, left,

respectively.

DEFLECTION DIST: Adjust deflection in vertical direc-

tion. Adjust [→], [←] to obtain

square picture.

BRIGHTNESS:

Adjust CRT brilliance. [→], brighter;

[←], dimmer.

5. To return to the SYSTEM menu, press the MENU key.

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6.3 System Menu

Press the MENU key while turning on the power. The SYSTEM

menu appears.

** SYSTEM MENU **

SYSTEM SETTING

RANGE - SONAR MODE

RANGE - VERTICAL FAN MODE

RANGE/SHIFT - E/S

COLOR

LANGUAGE

DISPLAY TEST1 - ROM/RAM/KEY

TRAIN/TILT TEST

SCREEN ADJUSTMENT

TEST PATTERN

DISPLAY TEST2 - OPERATION

DEFAULT

EXIT: TURN OFF THE UNIT

Figure 6-3 System menu

Range - sonar mode menu

1. Select RANGE-SONAR MODE from the SYSTEM menu.

2. Press the MENU key.

** RANGE - SONAR MODE **

100

150

200

250

300

400

500

600

800

1200

1600

FACTORY SETTING :

YES

EXIT : PRESS MENU KEY

Figure 6-4 Range - sonar mode menu

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3. Select range.

4. Set range.

5. To return to the SYSTEM menu, press the MENU key.

6. To quit, reset the power.

Range - vertical fan mode

1. Select RANGE-VERTICAL FAN MODE from the SYSTEM

menu.

2. Press the MENU key.

** RANGE - VERTICAL FAN MODE **

100

120

160

200

240

280

320

400

FACTORY SETTING :

YES

EXIT : PRESS MENU KEY

Figure 6-5 Range - vertical fan mode menu

3. Select range.

4. Set range.

5. To return to the SYSTEM menu, press the MENU key.

6. To quit, reset the power.

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Range/shift - e/s

1. Select RANGE/SHIFT - E/S from the SYSTEM menu.

2. Press the MENU key.

** RANGE/SHIFT - E/S **

RANGE 1

160

240

320

SHIFT

FACTORY SETTING :

EXIT

YES

PRESS MENU KEY

Figure 6-6 Range/shift - e/s screen

3. Select range (shift).

4. Set range (shift).

5. To return to the SYSTEM menu, press the MENU key.

6. To quit, reset the power.

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Color setting

The color setting screen allows you to adjust display colors.

1. Select COLOR from the SYSTEM menu.

2. Press the MENU key.

** COLOR **

LEVEL : R

HUE 1

TEXT

: R

: 11

: 13

: 15

: 14

:11 11 11

BKGD

: 0

HUE 2

TEXT

: R

:15 15 15

BKGD

: 0

: 14 11 0

: 13 13 0

: 11 13 0

HUE 3

TEXT

: R

: 0

13 0

:15 15 15

12 9

BKGD

: 0

11 11

10 12

FACTORY SETTING :

YES

EXIT : PRESS MENU KEY

Figure 6-7 Color setting screen

3. Select color.

4. Set color.

5. To return to the SYSTEM menu, press the MENU key.

6. To quit, reset the power.

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Factory setting menu (restoring default settings)

1. Select DEFAULT from the SYSTEM menu.

2. Press the MENU key.

** DEFAULT **

ARE YOU SURE? :

YES

EXIT : PRESS MENU KEY

NOTE! ALL SETTINGS INCLUDED IN SYSTEM MENU

WILL BE CHANGED TO FACTORY SETTING

Figure 6-8 Default screen

3. Select YES and press the MENU key to restore default set-

tings.

4. To return to the SYSTEM menu, press the MENU key.

5. To quit, reset the power.

Display test - operation

1. Select DISPLAY TEST - OPERATION from the SYSTEM

menu.

2. Press the MENU key. TEST appears on the screen while

the display unit is being tested.

3. To quit, reset the power.

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6.4 Dual Menu

Press the [MENU] and choose DUAL to open DUAL menu.

: SONAR BOTTOM/3D

DUAL

E/S

DUAL MODE

E/S

BOTTOM

SONAR

NET MOUTH SHIFT :

NET MOUTH WIDTH : 100

NET MOUTH HEIGHT

NET DEPTH

AUTO

MANUAL

OFF

HOR SCAN RATE

VER SCAN PATE

EXIT

: PRESS MENU KEY

Description of DUAL menu

DUAL MODE: Choose the display to show on the lower 1/3 of

the combination display. E/S: Echosounder, BOTTOM: Verti-

cal Fan, SONAR: Sonar picture from the CH-37 is displayed

like an echosounder picture. The default setting is E/S.

NET MOUTH SHIFT: Set the left/right position of the net mouth

mark. The setting range is -999 to +999 (m) and the default

setting is 0 m. (Setting range and default setting change with

unit of measurement.)

NET MOUTH WIDTH: Set the left/right width of the net mouth

mark. The setting range is 1-999 (m) and the default setting is

100 m. (Setting range and default setting change with unit of

measurement.)

NET MOUTH HEIGHT: Set the up/down width of the net mouth

mark. The setting range is 1-999 (m) and the default setting is

30 m. (Setting range and default setting change with unit of

measurement.)

NET DEPTH: Choose the net mouth mark depth setting method.

The default setting is AUTO. AUTO: Use the IEC/NMEA depth

data sentence DBS. MANUAL: Set the depth with the [↑ ] or [↓]

key on the sub panel.

HOR SCAN RATE: Set the horizontal scan rate for the combi-

nation mode; that is, the number of horizontal scans produced

per line drawn in the combination display. The setting range is

1-10 and the default setting is 1.

VER SCAN RATE: Set the vertical scan rate for the combina-

tion mode. that is, the number of vertical scans produced per

line drawn in the combination display. The setting range is 1-

10 and the default setting is 1.

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MAINTENANCE & TROUBLESHOOTING

Good performance depends on regular maintenance. Follow-

ing the recommended procedures in this chapter will keep the

equipment operating in top condition for years to come.

WARNING

ELECTRICAL SHOCK HAZARD

Do not open the equipment.

Only qualified personnel

should work inside the

equipment.

7.1 Maintenance of Display Unit

• Handle with care. Corrosion may start even from a scratch.

• Allow space around the unit for ventilation.

• Keep it away from equipment with magnets (such as a

speaker, large capacity transformer) and also magnetic-sen-

sitive units such as gyrocompass or cassette tape.

• Clean the filter and screen with a wet or dry soft cloth. Do

not use commercial cleaners to clean the display unit —

they can remove paint and markings.

• Cover the display unit when it is not in use.

• Degauss the display with the DEGAUSS key when picture

color is abnormal.

7.2 Maintenance of Transceiver Unit

Keep the unit clean, especially the cable entrance. Wipe off

dust or oil with a cloth dampened in water-diluted mild deter-

gent.

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7.3 Maintenance of Hull Unit

Lubrication

Grease the raise/lower screw shaft once a year. Also, grease

the raise/lower main shaft (upper part of the grease cotton re-

tainer) twice a year. These parts can accessed by removing

the raise/lower drive assembly cover.

Manual raise/lower of transducer with hand crank

Ship’s mains should be supplied to the hull unit to do this check.

Also be sure to press and hold down the brake-off switch while

manually raising/lowering the transducer. Failure to press the

switch may damage the raise/lower motor.

1. Turn off the breaker on the hull unit.

2. Remove the brake-off switch cover.

3. Set 19 mm socket wrench and turn it while pressing the

brake-off switch.

4. Check that the transducer can be raised/lowered smoothly

with a constant force from the upper to the lower limit posi-

tions. If not, centers of the main body flange and the retrac-

tion tank are not aligned. Adjust the hull unit mounting

position.

Brake-Off

Raise

switch

Lower

Breaker

Figure 7-1 Using the hand crank

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7.4 Display Unit Test

This test checks the ROM, RAM and keyboard for proper op-

eration.

1. Turn on the power while pressing and holding down the

MENU key. Release the MENU key when you hear a beep.

The SYSTEM menu appears as shown below.

** SYSTEM MENU **

SYSTEM SETTING

RANGE - SONAR MODE

RANGE - VERTICAL FAN MODE

RANGE/SHIFT - E/S

COLOR

LANGUAGE

DISPLAY TEST1 - ROM/RAM/KEY

TRAIN/TILT TEST

SCREEN ADJUSTMENT

TEST PATTERN

DISPLAY TEST2 - OPERATION

DEFAULT

EXIT: TURN OFF THE UNIT

Figure 7-2 System menu

2. Select DISPLAY TEST1 - ROM/RAM/ KEY with the arrow

keys on the sub panel 2.

3. Press the MENU key to start the test. The program no., Tx

frequency, and pitch and roll angles are displayed, and the

ROM, RAM, SI/O are checked.

4. Operate each key and control on the main panel, sub panel

and remote control box. A pressed key’s on-screen indica-

tion changes to 1 when the key is pressed; 0 when it is

released.

5. To return to the SYSTEM menu, press the MENU key again.

6. To quit, reset the power.

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** DISPLAY TEST **

PROGRAM NO. 0650101-xxx

MAIN PANEL

ROM Program version

NO. is displayed, ROM

RAM and serial ports

are checked for proper

operation, and Tx fre-

quency, roll angle and

pitch angle are displayed.

Main panel

ROM

SRAM

VRAM

SIO1

255

check. Switch is

normal if value

changes when

switch is operated.

SIO2

TX FREQUENCY 60KHZ

X: 0

Y: 0

ROLL

PITCH

SUB PANEL

REMOTE CONTROL

Sub panel

Remote Control

Box check. Switch

is normal if value

changes when

check. Switch is

normal if value

changes when

switch is operated.

255 255 255 *

switch is operated.

0 0

EXIT

EXIT : PRESS MENU KEY

Figure 7-3 Display unit test results

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7.5 Train/Tilt Test

This test checks the transducer training and tilting functions for

proper operation.

1. Turn on the power while pressing and holding down the

MENU key.

2. Select TRAIN/TILT TEST with the arrow keys in the sub

panel 2.

3. Press the MENU key to start the test.

4. To return to the SYSTEM menu, press the MENU key again.

5. To quit, reset the power.

** TRAIN / TILT TEST **

-- PHOTO SENSOR CHECK --

TRAIN

TILT

This checks the photo sen-

sors which detect the refer-

ence angles for training

and tilting operations.

0°

180°

+10° OK

90° OK

190° OK

-- TRAIN CHECK --

This checks the transducer

training operation. The four

digit figures show the num-

ber of pulses used to train

the transducer by 180.

If training is abnormal, NG

(No Good) count increases

by one.

PULSES NG

1428

1449

1427

1451

0 → 180° ( CW)

180 → 0° ( CW)

0 → 180° (CCW)

180 → 0° (CCW)

-- TILT CHECK --

PULSES NG

1206

939

919

This checks the transducer

tilting operation. If the num-

ber of pulses used to tilt the

transducer is abnormal, NG

count increases by one.

+10 → 90°

90 → 190°

190 → 90°

90 → +10°

1225

TEST COUNT =

EXIT : PRESS MENU KEY

Figure 7-4 Train/tilt test results

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7.6 Test Pattern

This test checks display position and colors.

1. Turn on the power while pressing and holding down the

MENU key.

2. Select TEST PATTERN with the arrow keys in the sub panel

3. Press the MENU key to start the test.

BLUE

BLACK

RED

GREEN

Position check

Figure 7-5 Test pattern

4. To return to the SYSTEM menu, press the MENU key again.

5. To quit, reset the power.

7.7 Error Messages

Raise/lower error message

If the power is not applied to the hull unit, the following mes-

sage appears on the screen and the buzzer sounds.

HULL UNIT

POWER OFF

(CHECK BREAKER AND FUSE)

PRESS R/B KEY TO SILENCE ALARM

Figure 7-6 Raise/lower error message

If this occurs, turn the power off and check the breaker and

fuse as the screen suggests.

7-6

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Transceiver unit error message

If the power is not supplied to the transceiver unit, the following

message appears on the screen and the buzzer sounds.

TRANSCEIVER

UNIT

POWER OFF

(CHECK FUSE ON TRANSCEIVER UNIT)

PRESS R/B KEY TO SILENCE ALARM

Figure 7-7 Transceiver unit error message

If this occurs, turn the power off and check the fuse as the

screen suggests.

Speed warning

Because the transducer may be damaged if it is kept lowered

when ship’s speed exceeds 15 knots (based on the speed rela-

tive to ground fed from nav sensor), the following message

appears and the buzzer sounds.

Press the R/B key to silence the buzzer and return to the nor-

mal sonar picture. Raises the transducer.

TRANSDUCER

REMAINS

LOWERED

(REDUCE SHIP’S SPEED AND PRESS ↑ KEY)

PRESS R/B KEY TO SILENCE ALARM

Figure 7-8 Speed warning

7-7

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Train error message

If something is wrong with the train control circuit, the following

message appears and the unit stops operating. Turn the PWR

switch off and contact your service agent at your earliest con-

venience.

TRAIN NG

Figure 7-9 Train error message

Tilt error message

If something is wrong with the tilt control circuit, the following

message appears and the unit stops operating. Turn the PWR

switch off and contact your service agent at your earliest con-

venience.

TILT NG

Figure 7-10 Tilt error message

7-8

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7.8 Troubleshooting Table

The table below provides common symptoms of equipment

troubles and the means to rectify them. If normal operation

cannot be restored, do not check inside the system. Any repair

work is best left to a qualified technician.

Symptom

No picture

Check

Power supply.

Check ship’s mains voltage at the

power plug connected to the power

unit.

FUSE

Fuse.

If blown, replace with 10A fuse. Call

service technician if it blows again.

NEVER use a fuse of a higher rating.

1 +

2 -

3 SHIELD

POWER CABLE

Bottom echo becomes

irregular

Rough seas.

Distance to sea bottom changes due

to rolling and pitching.

Long range selected.

Since transmission period is a little

longer, ship’s rolling and pitching are

apt to effect detection of echo.

Weak echo

TX OUTPUT POWER set to other than

"C."

SONAR BOTTOM/3D

E/S

Check the TX OUTPUT POWER

setting on the SONAR menu, and

set it to "C" for max. output power.

TX RATE

TX PULSE LENGTH

LONG

SHORT

TX OUTPUT POWER :

C (MAX)

TVG effect is excessive.

Excessive TVG results in elimination

of useful echoes.

Note: Readjustment of TVG is

required whenever the GAIN

control is adjusted.

LEVEL TIME

TVG

Somewhat strange color

BRILL control set too low.

Increase the brightness.

BRILL

(Continued on next page)

7-9

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Symptom

Check

Color partially irregular

Magnet is near the screen.

This symptom occurs if equipment

which contains a magnet (loudes-

peaker, etc.) is placed near the

screen. Check to see if the degaus-

sing circuit is turned off on the SYS-

TEM SETTING menu. See page 6-

Note: If not cleared, consult with

electronics technician.

Picture distorted

Equipment generating strong mag-

netic field is near display unit.

Locate magnetic field generating

equipment (rectifier, etc.) well away

from the display unit.

Picture contains noise

Equipment not grounded properly.

Carefully check the ground.

Display Unit

Transceiver

Unit

Power cable is run alongside the

signal cable.

Signal cable may pick up noise emit-

ted from power cable of other equip-

ment; therefore, separate them from

each other.

Copper

plate

Power cable

of other set

Signal cable

Debris may be on sea surface.

Reject unwanted echoes with the

interference rejector on the SONAR

menu, TVG control or NL control.

Separate

physically

7-10

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CUSTOM MODE KEY LABELS

(FRONT)

(BACK)

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

FISHING GROUND

200m

0°

200m

0°

100m

225°

30°

360°

30°

180°

FISHING GROUND

Cut out label, record settings on label,

fold in half and insert in label case.

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

RANGE

SECTOR

TRAIN

TILT

Fold here

FISHING GROUND

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

RANGE

SECTOR

TRAIN

TILT

RANGE

SECTOR

TRAIN

TILT

FISHING GROUND

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

RANGE

SECTOR

TRAIN

TILT

RANGE

SECTOR

TRAIN

TILT

FISHING GROUND

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

RANGE

SECTOR

TRAIN

TILT

RANGE

SECTOR

TRAIN

TILT

FISHING GROUND

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

RANGE

SECTOR

TRAIN

TILT

RANGE

SECTOR

TRAIN

TILT

AP-1

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SPECIFICATIONS OF COLOR SECTOR SCANNING SONAR

CH-37

1. GENERAL

(1) Display System

(2) Picture Color

(3) Display Mode

PPI display on high resolution 15”(381mm) color CRT

16 or 8 color depending on signal strength

1) Normal sonar mode display*

2) Expanded sonar mode display

3) Vertical fan mode display*

4) 3D mode display (front view)

5) 3D mode display (slant view)

*: E/S combination display is optionally available in modes 1) and 3).

Optional external E/S interface is required.

(4) Range/Train Speed

Range

Detection Range (m)

Train Speed **

(sec./360°)

3.8

60 kHz

0-50

162 kHz

0-50

0-100

0-150

0-200

0-250

0-300

0-400

0-500

0-600

0-800

0-1200

0-1600

0-100

0-150

0-200

0-250

0-300

0-350

0-400

0-450

0-500

0-600

0-800

4.3

4.8

5.4

6.0

6.7

7.6

8.6

10.0

12.0

16.0

21.0

**: Measured at fast train mode of 60 kHz (reference only).

Display sector width is selected among 45°, 90°, 135°, 180°, 225° and 360° by horizontal, 36°, 60°, 96°,

120°, 156° and 180° by vertical.

2. DISPLAY UNIT

(1) Display System

(2) Color Hue Control

(3) Contrast

PPI display on high resolution 15”(381mm) color CRT

LOG, linear, square

Variable

(4) Display Mode

(5) Unit Indication

Vertical Mode, Slice Mode, 3D Mode

m, ft, fa

SP - 1

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(6) Horizontal Range

(7) Vertical Range

(8) E/S Range*

(9) E/S Shift*

12 steps during 30 m to 1600 m

12 steps during 10 m to 800 m

5 steps during 10 m to 800 m

1000 m max.

(10) Offcenter

4 point at Expand mode, according to the train setting

2 point at Slice mode, according to the tilt setting

Level(100 dB max.), Range(1000 m max.)

Variable, Hue control

(11) TVG

(12) Clutter

(13) Elimination Interference Correlation with before data

(14) Audio Monitor

2 W, 4 ohms using external speaker SC-05WR(option)

*: Optional external E/S interface is required.

3. TRANSCEIVER

(1) Frequency

(2) Output Power

(3) Beamwidth

(4) Pulselength

60/162 kHz selected by internal settings

0.8 kW(60 kHz), 1.5 kW(162 kHz)

-6 dB,

0.2 to 10.6 ms, varied according to the range in use

(selected on the Menu)

4. HULL UNIT

(1) Train Step

45° step by fast scan mode or 6° step by normal mode

(2) Tilting

Horizontal mode

Tilt Range: +5° to 90°, Tilt Step: 1° step

Tilt Range: 0° to +180°, Tilt Step: 6°(fast scan) or 3°(normal)

400 mm

Vertical Fan Mode

(3) Transducer Travel

(4) Raise/Lower Time

(5) Allowable Ship’s Speed

10 sec approx. (24/32 VDC)

18 knots or less

(15 knots during raise/lower operation)

5. POWER SUPPLY AND CONSUMPTION

(1) Display Unit

(2) Transceiver Unit

(3) Hull Unit

24/32 VDC (20 to 41.6VDC), 140 W approx. or

100/110/200/220 VAC, 50/60 Hz , 1

24/32 VDC (20 to 40 VDC), 50 W approx. or

100/110/200/220 VAC, 50/60 Hz , 1

24/32VDC, 50 W approx. (150 W while traveling)

AC spec. set requires rectifier RU-1746B-2

SP - 2

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6. ENVIRONMENTAL CONDITION

(1) Ambient Temperature

(2) Relative Humidity

0°C to 50°C

95% or less (at 40°C)

7. CORTING COLOR

(1) Display Unit

Chassis: 2.5GY5/1.5

Panel: N-3.0

2.5GY5/1.5

(2) Hull Unit

(3) Transceiver Unit

2.5G7/2

SP - 3

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INDEX

¡, ™, £ keys (custom mode keys) 5-1–5-2

3D mode 4-1–4-3

3D view scale (time, distance) 4-3

GAIN control 2-7

Horizontal marker 3-6

HUE key 1-6

Hull unit care 7-2

AUDIO control 2-9

AUTO TRAIN key 3-3

Auto train sector (vertical fan mode) 3-8

Indications

Background color 1-6

Beamwidth (vertical fan mode) 3-8

Bottom/3D menu 3-8

sonar mode 2-24–2-25

vertical fan mode 3-12

IR control

sonar mode 2-8

vertical fan mode 3-5

BRILL control 1-3

Color adjustment 6-7

Color quantity 2-16

Keying pulse synchronization 2-17

Custom mode key labels AP-1

Custom mode keys (¡, ™, £) 5-1–5-2

Main panel description 1-1

Maintenance

Display unit 7-1

Hull unit 7-2

Transceiver unit 7-1

Menu tree vii

Default menu settings 8-9

DEGAUSS key 1-6

DIMMER control 1-3

Display unit care 7-1

Display unit test

MODE control 1-4

Motion Sensor MS-100 2-16

operation 6-8

ROM, RAM, keyboard 7-3

NL control 2-8

E/S key 1-2, 1-5

E/S menu 2-17

Echo resolution

Sonar mode 2-16

E/S mode 2-18

ENTER key 1-2, 5-1

Error messages 7-6–7-8

EVENT key

sonar mode 2-10

vertical fan mode 3-6

Event marker

sonar mode 2-10

vertical fan mode 3-6

Output power 2-12, 2-16

Presentation mode 1-4

Pulselength 2-12, 2-15

PWR switch 1-3

R/B key

sonar mode 2-10

vertical fan mode 3-6

R/B marker 2-10

Raise/lower error message 7-6

RANGE control

FAST SCAN key

sonar mode 2-3

vertical fan mode 3-4

FULL/HALF key 2-11

sonar mode 2-2

vertical fan mode 3-2

Index-1

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Range preset

e/s mode 6-4

sonar mode 6-4

vertical fan mode 6-5

Screen adjustment 6-2

SECTOR control

sonar mode 2-3

vertical fan mode 3-4

Sonar menu 2-15

Speed warning 7-7

Sub panel description 1-2

System configuration vi

System menu 6-4

System setting menu 6-1

Test pattern 7-6

Tilt angle 2-4

TILT control

sonar mode 2-4, 2-14

vertical fan mode 3-4

Tilt error message 7-6

TRACK key 2-17

TRAIN control

sonar mode 2-15

vertical fan mode 3-3

Train error message 7-8

Train/tilt test 7-5

Transceiver unit care 7-1

Transceiver unit error message 7-7

TRANSDUCER switches 1-3

Troubleshooting

display unit test 7-3

error messages 7-6

test pattern 7-6

train/tilt test 7-5

troubleshooting table 7-9

TVG control

sonar mode 2-13

vertical fan mode 3-7, 3-8

Tx rate 2-15

Tx rate adjustment 2-8

V:H RANGE key 3-2

Vertical marker 3-6

Index-2

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