No part of this publication may be reproduced, transmitted, translated in any from by any means
without the written permission of Koden Electronics Co., Ltd. The technical descriptions contained in
this publication are subject to change without notice. Koden assumes no responsibility for any errors,
incidentals or consequential damages caused by misinterpretation of the descriptions contained in this
publication.
0093112802-00 i
Important Notice
CVS-128
Important Notice
• The re-use and transcription of Instruction Manual (hereafter called this manual) needs permission
of our company. Our company prohibits the un-authorized re-use and transcription.
• If this manual is lost or damaged, consult our dealer or our company.
• The specification of our products and the content in the Instruction Manual are subject to changed
without notice.
• In the explanation of this manual, the content displayed on the menu of product may be different.
The keys and menus in the illustration may differ in physical font and shape. And some parts may
be omitted.
• Our company is not liable for damage and trouble arisen from misunderstanding the content
described in this manual.
• Our company is not liable for earthquake, lightning, fire for which our company is not responsible,
action by third party, other accident, customer’s unintended error/abuse and damage caused by the
use under other abnormal condition.
• Our company is not liable for damage of accompaniment (change/loss of memorized content, loss
of business profit, stop of business) arisen from use or failure of our product.
• If the stored data is changed or lost, irrespective of any cause of trouble and damage, our company
is not liable for it.
• Our company is not liable for any damage arisen from malfunction caused by combination of
software and connected equipment we do not involve.
ii 0093112802-00
CVS-128
For Your Safe Operation
For Your Safe Operation
Pictorial used in this Instruction Manual
This Instruction Manual uses the following pictorials. Understand the meaning of each pictorial and
implement the maintenance and inspection.
Symbol Meaning
Mark for warning
This symbol denotes that there is a risk of death or serious injury when not
dealing with it correctly.
Mark for danger high voltage
This symbol denotes that there is a risk of death or serious injury caused by
electric shock when not dealing with it correctly.
Mark for caution
This symbol denotes that there is a risk of slight injury or damage of device
when not dealing with it correctly.
Mark for prohibition
This symbol denotes prohibition of the specified conduct. Description of the
prohibition is displayed near the mark.
Caution Item on Equipment
Be careful of a high voltage inside.
A high voltage, which may risk your life, is used. This high voltage remains
in the circuit after you have powered off switch. To prevent touching the high
voltage circuit inadvertently, the hard cover is provided to the high voltage
circuit and the high voltage caution label is affixed. Ensure to power off
switch for your safety and discharge the electricity remaining in the capacity
before starting to check. An engineer authorized by our company should
inspect and maintain
Be sure to power off in the boat.
If the power switch is inadvertently powered on during work, you will be
electrified. To prevent such accident from occurring, ensure to power off in
the boat and the power of equipment. Furthermore, it is safer to hang the
caution tag described as [Under Work] near the power switch of equipment.
Be careful of dust
Inhaling dust may cause A respiratory disease. When cleaning the inside of
equipment, be careful not to inhale dust. Wearing a safety mask is
recommended.
0093112802-00 iii
For Your Safe Operation
Caution on location of equipment
Do not install the equipment where it is excessively damp and suffers from
excessive water drops.
Escaping from static electricity
The static electricity may be generated from the carpet on the floor in the
cabin or clothes made of synthetic fiber. The static electricity may destroy
the electronic parts on the circuit board. Handle the circuit board, taking the
measure of static electricity free.
Install the transducer at the location where it is not affected by bubble and
noise The bubble and noise seriously degrade the performance of this unit.
Caution Item on Handling
Do not disassemble or modify. It may leads to trouble, fire, smoking or
electric shock. In case of trouble, contact our dealer or our company.
CVS-128
In case of smoke or fire, boat power off and the power of this unit. It may
cause fire, electric shock or damage.
Be cautious of remaining high voltage.
A high voltage may remain in the capacitor for several minutes after you
have powered off. Before inspecting inside, wait at least 5 minutes after
powering off or discharge the remaining electricity in an appropriate manner.
Then, start the work.
The information displayed in this unit is not provided directly for your
navigation. For your navigation, be sure to see the specified material.
Use the specified fuse. If un-specified fuse is used, it may cause a fire,
smoke or damage.
Whenever transmitting, be sure to submerge the transducer in water first. If
transmitted without submerging the transducer, it may be damaged.
iv 0093112802-00
CVS-128
Contents
Contents
Document Revision History....................ⅰ
Important Notice.....................................ⅱ
The CVS-128 is a Dual frequency (50 kHz/200 kHz) Color LCD display echo sounder.
This unit equipped with digital process displays the circumstance in the water under all conditions,
matching with the high luminance 8.4 inch LCD.
The main features of this unit are as follows:
• With the digital reception process, the compatibility of the high resolution in a shallow depth and the
noise rejection capability in a deep depth are established. The auto mode function provides the best
image.
• The high-performance LCD maintains high visibility under any conditions.
• The unit can be installed in an open bridge and is highly waterproof.
• Sona-Tone (Sonar sound) function is equipped with for catching situations schools of fish and
others by sound.
• Up to 10 images can be stored. If you connect the optional GPS, the fishing hot spot function, that
directs your board to navigate easily to the location desired, is available by marking the event mark
when recalling the stored image.
• With the adoption of a specific filter (AR coat), an image can be seen clearly, refusing sunshine.
The countermeasures against the reflection on the LCD screen and dew are provided.
• The various alarm functions are available. (Bottom, school of fish, water temperature*, board
speed*, arrival*, XTE*, power) (Note: The mark * denotes that the connection of option is
mandatory)
• When flush-mounting, the unit can be easily installed from front side.
• The RGB output for an external monitor is provided as standard equipment. The use of the external
monitor enables you to observe easily the echo sounder screen at a location which is remote from a
main unit. (External monitor: Prepared by a customer)
viii 0093112802-00
CVS-128
Water temperature sensor
With mounting bracket and hard cover
Connection to the Transducer
Connection to the water
Legend
external water temperature meter
/ speed sensor
System Configuration
System Configuration
Connection Diagram
To Transducer connector
(J6 connector)
CVS-128 Display unit
To POWER connector
CW-840-0.3M
To External monitor connector
(J7 connector)
CW-576-0.5M
CW-264A-2M
External power output (For GPS etc)
External speaker (For speaker with amplifier)
NMEA circuit input output
GPS sensor (GPS-20A)
External navigation equipment,
red
+
Black
10.8-31.2VDC
ー
Standard configuration
Option
Prepared by a user
External monitor
(Prepared by a user)
(Prepared by a user)
Connection to the speed sensor
Temperature
Note: To use the water temperature sensor / speed sensor,
The wiring of transducer connector has to be changed.
ST-80/90/100
Transducer TD-501C (Dual frequency combination type 50 / 200 kHz)
Rubber mold made Equipped with inner-hull
Transducer TD-500T-3B / 501T-3B (Dual frequency combination type 50 / 200 kHz)
Bronze made Equipped with through-hull
Transducer TD-500T-2B (Dual frequency combination type 50 / 200 kHz)
Plastic made Equipped with inner-hull
0093112802-00 ix
Configuration of Equipment
Configuration of Equipment
Standard Equipment Configuration List
CVS-128
No
1 Display unit
2 Hard cover
3 DC power cable
4 Fuse
Name of item Type Remark
(Complex cable)
Weight/
Length
600 W/1 kW output
CVS-128
E57MB11060 250 g 1
CW-264A-2M
with mounting bracket
and knob
With 12 connector at
one end/ un-treated at
the other end
3.2 kg
2 m 1
Quantity
1
F-7161-3A
Cylinder (ø 6.3x32)
5 Cap
LTWCAP-DABCFXC1
6 Operation Manual CVS-128.OM.E English 1
7 Quick Reference CVS-128.QR.E English 1
Normal fusion type for
main power
For transducer cable
connector
2
1
Essential Option
No
1 Transducer Type of transducer
Name of item Type Remark
(Next page )
transducer cable (with
connector at one end)
Weight/
Length
1
Quantity
x 0093112802-00
CVS-128
Type of transducer
No
Specification Frequency Material /
TD-500T-2B
Length of
the cable
Configuration of Equipment
Mounting method Beam width
(Right and left x back and
forth)
1
TD-500T-3B
2
TD-501C
3
TD-501T-3B
4
Option List
50/200 kHz
600 W
50/200 kHz
600 W
50/200 kHz
1 kW
50/200 kHz
1 kW
Plastic
9m
Bronze
9m
Rubber
mold
10m
Bronze
9m
Inner-hull
(The inner-hull kit is
needed.)
Through-hull
Inner-hull
(The inner-hull kit is
needed.)
(The CW-840-0.3M
is needed)
Through-hull
50kHz
50°x50° ( -6dB)
200kHz
17°x17° ( -6dB)
50kHz
50°x50° ( -6dB)
200kHz
17°x17° ( -6dB)
50kHz
58°x20° ( -6dB)
200kHz
17°x 6° ( -6dB)
50kHz
20°x22° ( -6dB)
200kHz
5°x 5° ( -6dB)
No
1
2 GPS sensor
3 Inner-hull kit
4 Cable for transducer
5
6
Name of Item Specification Remark Weight/Length
Water temperature
sensor/speed sensor
Connector for GPS
sensor
Cable for external
monitor
ST-80
ST-90
ST-100
GPS-20A-10M-B
[SI-TEX
MFB-04
MFB-04W
CW-840-0.3M
LTWBD-06PMMP-LC
CW-576-0.5M
For transom mounting
Plastic made (with cable)
For through-hull mounting
Plastic made (with cable)
For through-hull mounting
Bronze made (with cable)
For GPS measuring
(With power & signal cable)
Plastic made for installing the
transducer TD-500T-2B
Plastic made for installing the
transducer TD-501C
Needed when using the
optional water temperature
sensor / speed sensor.
Needed when using the
GPS-20A(Type B)sensor.
Junction cable for connection of
external monitor
0.3 kg / 9 m
0.6 kg / 9 m
1.2 kg / 9 m
250 g / 10 m
1.3 kg
1.3 kg
30 cm
0.5 m
0093112802-00 xi
CVS-128
1
2
4
5
6
7
8
9
10
3
D
ISP】
Chapter 1 Basic Operation
1.1 How to use the key
Chapter 1 Basic Operation
CVS-128 Display unit
In addition, for your convenience when operating keys other than keys in the menu by the [MENU] key,
the menu displayed automatically closes.
No. Key Name Explanation
1
[F1] Recalls directly the item preset.
2
3
4
5
6
7
8
9
10
[EVENT]
[Cursor]
[MENU] Opens or closes the menu.
[F2] Recalls directly the item preset.
[ RANGE ] Changes the range setting.
[GAIN(HF) Knob]
[GAIN(LF) Knob]
【
[BRILL ]/ Power
Notifies the external equipment of the present position. Presets the
menu. It begins a fishing hot spot.
Selects the menu item. Changes the set value.
Moves the VRM marker. IMoves the marker for notifying the event.
Rotate: Changes the gain value.
Press: Recalls the gain select.
Rotate: Changes the gain value.
Press: Recalls the gain select.
Switches to the High frequency or Low frequency of echo sounder
image, zoom and navigation menu.
Press: Power on. Adjusts the brilliance and brightness of panel.
Long-press: Power off.
0093112802-00 1-1
Chapter 1 Basic Operation
CVS-128
How to remove the hard cover
While widening the claws at right and left sides of hard cover, draw the hard cover towards you.
Claw
When removing CVS-128 Display unit
To prevent dust from entering, cap the connector at the rear of CVS-128 Display unit and the power
cable with caps.
Install the supplied cap to the transducer cable as shown in the figure and cap it.
Caution: Do not pull the cable strongly. If you do so, it will be broken.
The clean of CVS-128 Display unit
The cleaning of the display unit goes after removing the front-frame. After removing the front-frame, use
a synthetic detergent and OA cleaner and wipe the display unit lightly. Then dry sufficiently, and return
the front- frame to original position.
Caution: The display unit has a special coating. Do not use a solvent such as paint thinner,
acetone, alcohol, and benzene, etc.
Caution: Strong rubbing may cause bruising, scratching.
1-2 0093112802-00
CVS-128
Fish
Schools of fish
Oscillation line
Depth
Chapter 1 Basic Operation
1.2 Power On/Off
Power on
1
Press the [BRILL ] key to power on.
The startup menu is displayed. When
started up, the memories (ROM, RAM) are
automatically checked. When checking is
normally finished, the menu below is
displayed.
Explanation of the display:
Rainbow pattern
Time mark
Gain
Alarm icon
Range
Function icon
Event icon
Caution: If an error occurs in the memory
check, the LED on the operation
panel blinks. The unit may be not
function normally. If you suspect
trouble, contact the dealer of your
purchase or our company.
2
Language Selection at Initial Startup.
When powering on first, after the [Initialize] is
processed, the [Language] menu is displayed.
Language
English
日本語
Select the language with [] key or [] key.
(The language can be selected by rotating the
[GAIN (HF) Knob]or [GAIN (LF) Knob].)
3
Press the [MENU] key to decide the
language.
4
After a few seconds pass, the menu
selected in [DISP] is displayed.
Type of Gain
H: High frequency gain
L: Low frequency gain
Type of Range
R: M: Manual Range
R: A: Auto Range
R: AS: Auto Shift
Power off
1
When powering off, keep pressing the
[BRILL ] key for 3 seconds.
The remaining time for the power to shut off
is displayed on the menu.
Alarm of Power Voltage
If detecting the malfunction of the voltage, the
icon blinks and the alarm beeps.
Caution: In case of the low voltage or the
high voltage, it shuts down. The
precision of Power Voltage is ± 0.5 V.
Caution: In addition to English, Japanese,
there are several compatible
languages.
0093112802-00 1-3
Chapter 1 Basic Operation
Dual Freq
CVS-128
1.3 LCD Brilliance Adjustment
Adjustment of LCD Brilliance
The brilliance of the display can be adjusted to
facilitate visualization.
The [Lcd brill] and [Panel brill] can be switched
every time when pressing the [BRILL ] key.
1
Press the [BRILL ] key for a short period of
time to display the menu ([Lcd brill]).
2
Rotate the [GAIN (HF) Knob] or [GAIN (LF)
Knob]. When “1” is selected, it is darkest.
When “10” is selected, it is brightest.
Lcd brill
10
3
Press the [MENU] key to close the menu.
Brightness Adjustment of Panel
Brilliance
The brightness of panel can be adjusted.
The [Lcd brill] and [Panel brill] can be switched
every time when pressing the [BRILL ] key.
1
Press the [BRILL ] key for a short period of
time to display the menu ([Panel brill]).
Disp
NAV1
Normal (H)
Zoom (H)
Zoom (L)
Normal (L)
NAV2
(H): High frequency
(L): Low frequency
NAV1: Navigation display1
NAV2: Navigation display2
3
Press the [MENU] key to close the menu.
Normal Image (Low frequency, High
frequency)
Low frequency (50 kHz)
Since the beam width is wide, the search range
becomes wide so that the beam can search the
deep depth.
High frequency (200 kHz)
Since the beam width is narrow, it is hard to be
interfered by noise and bubble in the sea so that
the schools of fish can be searched in a high
resolution.
2
Rotate the [GAIN (HF) Knob] or [GAIN (LF)
Knob]. When “1” is selected, it is darkest.
When “10” is selected, it is brightest.
Panel brill
10
3
Press the [MENU] key to close the menu.
1.4 Switch-over of Display mode
7 kinds of displays are provided in all. Select the
display suitable for your purpose.
1
Press the [DISP] key.
2
Select the display you desire to display.
(Press the [ ] key or [ ] key.)
(The set item can be selected by rotating the
[GAIN (HF) Knob] or [GAIN (LF) Knob].)
Low frequency
(50 kHz)
High frequency
(200 kHz)
1-4 0093112802-00
CVS-128
Chapter 1 Basic Operation
Dual frequency
The High frequency image can be displayed in
the right half side and the Low frequency image
can be displayed in the left half side. Since the
beam width differs depending on frequency, the
schools of fish and sea bottom look different.
Low frequency image
High frequency image
Zoom (Low frequency, High frequency)
A part of normal image can be zoomed. (1) [BTM.] (Bottom), (2) [B.D.] (Bottom Discrimination), (3)
[Zoom], (4) [B.Z.] (Bottom Zoom) and (5) [B.F.Z.] (Bottom Follow Zoom) are provided for zoom.
The unit is set to (1) [BTM.] at ex-factory. To change to other zoom display, set it in the menu. (See
[2.15 Selection of Zoom])
Zoom type Purpose
Bottom It is convenient to see the
schools of fish near the
bottom.
Bottom
Discrimination
Zoom
Bottom Zoom It is convenient to see the
Bottom Follow
Zoom
It is convenient to see the
schools of fish and a
bottom quality near the
bottom.
It is convenient to see the
specified range in the
zoom.
schools of fish near the
bottom and the form of
the bottom.
It is convenient to see the
schools of fish near the
bottom and the form of
the bottom.
Zoom start position
It displays the position of
the bottom in the fixation
in the display bottom part.
It displays the position of
the bottom in the fixation
in the position of 1/4
under the display.
It displays a zoom start
position in the fixation at
the top of the display.
It displays the position of
the bottom in the position
which is the same as the
ordinary display.
It always displays the
position of the bottom in
the lower part of the
display.
Zoomed range
It displays the bottom and
upper in the zoom.
It displays the bottom and
upper in the zoom, it
displays under the bottom in
the ordinary.
(Under the bottom, it doesn't
display in the zoom).
It displays in the zoom from
the zoom start position to the
range you set.
It displays upper side of the
bottom in the zoom except
the bottom.
It displays the bottom and
upper and lower sides in the
zoom.
0093112802-00 1-5
Chapter 1 Basic Operation
Zoom image
CVS-128
(1) Bottom
Zoomed range
(2) Bottom Discrimination
The display width of zoom
is displayed in orange.
Normal image
30.0
Zoom image
The display width of zoom
is displayed in orange.
Normal image
(3) Zoom
Zoom start position
Zoomed range
Zoomed range
30.0
Zoom image
The display width of zoom
is displayed in orange.
Normal image
1-6 0093112802-00
30.0
CVS-128
Depth
Water temp
Course
XTE
(4) Bottom Zoom
Chapter 1 Basic Operation
The display width of zoom
is displayed in orange.
Normal image
Zoomed range
(5) Bottom Follow Zoom
Zoomed range
30.0
Zoom image
The image below the bottom
is not zoomed.
The display width of zoom
is displayed in orange.
Normal image
30.0
Zoom image
Navigation Menu (NAV1, NAV2)
The navigation menu can be displayed at the left side on the display. To display the information other
than depth, sensors need to be connected. (See [2.16 Selection of NAV Display])
Caution: Requires position data from GPS sensor.
0093112802-00 1-7
Chapter 1 Basic Operation
1
0.0
CVS-128
1.5 Switch-over of Range
The range of measured depth displayed on the
display can be changed.
To meet your purpose, select the range of
measured depth.
Setting the range switching to auto
range
By following automatically the bottom, the image
of echo sounder in the suitable range of
measured depth can be displayed.
This mode is convenient to display always the
range from sea level to bottom.
The range value
changes
Setting the range switching to Manual
range
The range can be manually selected:
1
Press [▲] or [▼] key of [▲RANGE▼].
2
Select the range you desire to set. (Press
[▲] or [▼] key of [▲RANGE▼])
3
Press the [MENU] key to close the menu.
When the [Manual] is set, the [R: M] is
displayed at the upper side of menu.
Range
Auto range
5.0
50.0
80.0
100.0
150.0
300
500
Auto shift
1
Press [▲] or [▼] key of [▲RANGE▼].
2
Select the [Auto Range]. (Press [▲] or [▼]
key of [▲RANGE▼])
3
Press [MENU] to close the menu.
Range
Auto range
5.0
10.0
50.0
80.0
100.0
150.0
300
500
Auto shift
When [Auto Range] is set, the [R:A] is
displayed a the upper side of menu.
Caution: At auto range, this sounder can
sound the area up to the maximum
range registered. The maximum range
is 800 m. At the initial setup, the range
is up to 500 m. (See [2.11 Preset of
Range])
1.6 Gain Adjustment
The gain can be adjusted in the auto mode (Echo
sounder mode, Depth mode) or manual mode.
[Cruising]
Eliminating the weak echo, it displays clearly the
sea bottom of strong echo.
It is suitable for cruising to the fishery ground.
[Fishing]
It displays clearly the weak echo reflected from
the school of fish.
It is suitable for searching the schools of fish.
Basic Operation of Gain
When [GAIN (HF) Knob] or [GAIN (LF) Knob] is
pressed twice, the screen of [Gain select] is
displayed.
By rotating the [GAIN (HF) Knob] or [GAIN (LF)
Knob], the gain adjustment or auto gain can be
selected.
Caution: The high frequency can be set by
[GAIN (HF) Knob] and the low
frequency can be set by [GAIN (LF)
Knob].
1-8 0093112802-00
CVS-128
Over-gain
Chapter 1 Basic Operation
Caution: When only high frequency is
displayed, no gain adjustment at low
frequency is available. When only low
frequency is displayed, no gain
adjustment at high frequency is
available.
Selecting the auto gain
When the [Cruising] or [Fishing] is set, the gain
can be fine-adjusted.
1
Press [GAIN (HF) Knob] twice, and [Gain
select] is displayed. (The high frequency is
explained below.)
Caution: The low frequency can be set by
[GAIN (LF) Knob].
2
Select the [Cruising] or [Fishing] by rotating
the [Knob].
Gain select
Manual
Cruising
Fishing
3
Press the [MENU] key to close the menu.
When the [Cruising] is set, the [L: AC] [H:
AC] is displayed at the upper side of menu.
When the [Fishing] is set, the [L: AF] [H: AF]
is displayed at the upper side of menu.
Selecting the manual gain
Adjustment of gain can be done manually.
1
Press [GAIN (HF) Knob] twice, and [Gain
select] is displayed. (The high frequency is
explaied below.)
Caution: The low frequency can be set by
[GAIN (LF) Knob].
2
Select the [Manual] by rotating the [Knob].
3
Press the [MENU] key to close the menu.
Manual adjustment of the gain
When the image of High frequency only is
displayed on the display, the High frequency gain
can be adjusted. (Setting: 0 ~ 10)
When the image of Low frequency only is
displayed on the display, the Low frequency gain
can be adjusted.
Caution: If you increase the gain too much,
noise will appear on the entire image,
resulting in an unclear image. Adjust
properly the gain so that the optimum
image can be always displayed.
Adjusting the gain by auto
The auto gain adjustment can be set to [Auto
adjust high] or [Auto adjust low]. (Setting:-10 ~
10)
1
Turn [GAIN (HF) Knob], and [Auto adjust
high] is displayed. (The high frequency is
explained below.)
Caution: The low frequency can be set by
[GAIN (LF) Knob].
2
Fine-adjust the gain by rotating the [GAIN
(HF) Knob]. The [Cursor] key menu position
can be moved.
Auto adjust high
0
3
Every time when pressing the [Gain select]
and [Auto adjust high] are alternately
displayed.
4
Press the [MENU] key to close the menu.
Under-gainOptimum
1
Turn [GAIN (HF) Knob] to display [Auto
adjust high]. (The high frequency is
explained below.)
Caution: The low frequency can be done
by [GAIN (LF) Knob].
2
Adjust the gain by rotating the [Knob]. The
[Cursor] key menu position can be moved.
Stop increasing of the gain just before noise
appears on the image.
3
Every time when pressing the [Gain select]
and [Gain (H)] are alternately displayed.
Gain(H)
6.0
0093112802-00 1-9
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