Koden CVS-128 User manual

Declaration of Conformity
(As referred to in Annex IV 2. of Directive 2004/108/EC)
Declares under his sole responsibility that the produced Echo Sounder manufactured by
Koden Electronics Co., Ltd.
5278 Uenohara
Uenohara-Shi ,
Yamanashi-Ken
409-0112, Japan
Telephone [phone] Telefax [phone]
Identified by the type number CVS-128 to which this declaration refers conforms to the
relevant essential requirements of Directive 2004/108/EC and is in conformity with the EMC
requirements of EU harmonised standard
EN 60945: 2002 (Clauses 9, 10 & 12)
Authorised representative in Europe
Heinz Hoghoff
Koden Elektronik GmbH.
Am Gewerbepark 15
D-64823, Gross–Umstadt
Germany.
Phone [phone]
Telefax+49 6078 73824
Signed
Heinz Hoghoff,
Dated 15 April 2009
N.B. As this product is for Maritime use compliance with Directive 72/23/EEC is not required.

Declaration of Conformity
(As referred to in Annex IV 2. of Directive 2004/108/EC)
Declares under his sole responsibility that the produced Echo Sounder manufactured by
Koden Electronics Co., Ltd.
5278 Uenohara
Uenohara-Shi,
Yamanashi-Ken
409-0112, Japan
Telephone [phone] Telefax [phone]
Identified by the type number CVS-128B to which this declaration refers conforms to the
relevant essential requirements of Directive 2004/108/EC and is in conformity with the EMC
requirements of EU harmonised standard
EN 60945: 2002 ( Clauses 9,10 & 12 )
Authorised representative in Europe
Heinz Hoghoff
Koden Elektronik GmbH.
Am Gewerbepark 15
D-64823, Gross–Umstadt
Germany.
Phone [phone]
Telefax+49 6078 73824
Signed :
Heinz Hoghoff,
Dated : 01 Jun. 2012 Document No. 72-2731U-X003
N.B. As this product is for Maritime use compliance with Directive 72/23/EEC is not required.

CVS-128/128B RevisionHistory
0093112802-06 i
CVS-128/128B Operation Manual
Doc No. 0093112802
Document Revision History
No. Doc. No-Rev. No. Reviced Date
(Y/M/D)
Revised Content
0 0093112802-00 2009/05/27 First edition
1 0093112802-01 2009/07/09 Chapter 1
2 0093112802-02 2010/01/12 Revision (From software KM-E79* Ver01.03 to Ver01.**)
3 0093112802-03 2011/04/27 Revision (From software KM-E79 Ver01.06 to Ver01.**)
System Configuration, Configuration of Equipment,
Chapter 5, Wording
4 0093112802-04 2011/12/26 Important Notice, Chapter 2, Chapter 6
5 0093112802-05 2012/06/15 Added CVS-128B
Revision (From software KM-E79 Ver01.08 to Ver01.**)
6 0093112802-06 2013/06/24 Revision (From software KM-F22* Ver01.02 to Ver01.**)
System Configuration, Configuration of Equipment,
Chapter 5
7
8
9
10
Document No. Revised Version Norm
When part of the document needs to be revised, the document has advanced revision number.
The document No. is indicated at the lower right side on the cover and at the left or right side of the
footer region of each page.
© 2009-2013 Koden Electronics Co., Ltd. All rights reserved.
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.
*KM-E79: CVS-128, KM-F22: CVS-128B
**Subject to version change

Important Notice CVS-128/128B
ii 0093112802-06
Important Notice
For copy and transcription of this Operation Manual (hereinafter referred to as this manual),
permission from Koden is needed. Koden prohibits the un-authorized copy and transcription of this
manual.
If this manual is lost or damaged, consult a dealer of Koden or Koden.
The specification of the products and the contents in this manual are subject to change without
notice.
The contents displayed on the menu of product may be different from the expression of this
manual. The fonts and shapes of the keys and menus in the illustration may differ from the actual
ones, and some parts may be omitted.
Koden is not liable for damages and troubles arisen from misunderstanding of the contents in this
manual.
Koden is not liable for any damages caused by earthquake, lightning, wind and flood damage and
fire for which Koden is not responsible, and actions by third parties, other accidents, customer’s
unintended error/abuse and the use under other abnormal conditions.
Koden is not liable for damages of accompaniment (change/loss of memorized content, loss of
business profit, stop of business) arisen from use or failure of our products.
If the stored data are changed or lost, irrespective of causes of troubles and damages, Koden is
not liable for them.
Koden is not liable for any damages arisen from malfunction caused by combination of software
and connected equipment in which Koden is not engaged.

CVS-128/128B For Your Safe Operation
0093112802-06 iii
For Your Safe Operation
Pictorial used in this Operation Manual
This Operation 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 causeA respiratory disease. When cleaning the inside of
equipment, be careful not to inhale dust. Wearing a safety mask is
recommended.

For Your Safe Operation CVS-128/128B
iv 0093112802-06
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.
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.

CVS-128/128B Contents
0093112802-06 v
Contents
Document Revision History.......................i
Important Notice.......................................ii
For Your Safe Operation .........................iii
Contents...................................................v
Introduction................................................ix
System Configuration .................................x
Configuration of Equipment.......................xi
Change the frequency ............................. xiv
Chapter 1 Basic Operation ......................1-1
1.1 How to use the key ....................1-1
How to remove the hard cover...1-2
When removing the
CVS-128/128B Display unit.......1-2
The clean of CVS-128/128B
Display unit ................................1-2
1.2 Power On/Off.............................1-3
Power on....................................1-3
Power off....................................1-3
Alarm of Power Voltage .............1-3
1.3 LCD BrillianceAdjustment.........1-4
Adjustment of LCD Brilliance.....1-4
Brightness Adjustment of Panel
Brilliance ....................................1-4
1.4 Switch-over of Display mode.....1-4
Normal Image (Low frequency,
High frequency)..........................1-4
Dual frequency...........................1-5
Zoom (Low frequency, High
frequency)..................................1-5
Navigation Menu (NAV1, NAV2) 1-7
1.5 Selection of NAV Display...........1-8
Type of NAV Display..................1-8
Selection of NAV Menu..............1-8
1.6 Switch-over of Range ................1-9
Setting the range switching to auto
range..........................................1-9
Setting the range switching to
Manual range.............................1-9
1.7 Setting of Shift............................1-9
Setting of Manual Shift...............1-9
Release of manual Shift...........1-10
Setting of Auto Shift .................1-10
1.8 Gain Adjustment.......................1-10
Basic Operation of Gain........... 1-11
Selecting the auto gain............ 1-11
Adjusting the gain by auto ....... 1-11
Selecting the manual gain ....... 1-11
Manual adjustment of the gain. 1-11
1.9 Use of [EVENT] key.................1-12
Selecting the event key function1-12
Presetting the waypoint ...........1-12
Store the image........................1-13
Fishing hot spot........................1-13
1.10 Use of [F1] / [F2] key................1-14
Selecting the
[F1] / [F2] key.........................1-14
Preset of [F1] / [F2] key ...........1-14
1.11 Operation of VRM....................1-15
1.12 Display of fish information........1-15
Display the fish symbol /Stop the
display of fish symbol...............1-16
Selecting the symbol info.........1-16
Fish symbol detection
adjustment ...............................1-16
Size adjustment .......................1-16
Big fish / Big fish color .............1-17
Points to note in use of fish
symbol......................................1-17
Chapter 2 How to use the Menu .............2-1
2.1 How to operate the menu ..........2-1

Contents CVS-128/128B
vi 0093112802-06
Display the menu / Stop the
display of menu..........................2-1
Menu Operation .........................2-1
2.2 Changing of Image Speed..........2-2
2.3 Rejection of Interference............2-2
Interference Rejection................2-2
2.4 Color Rejection of Weak Echo...2-3
Color Rejection...........................2-3
2.5 Rejection of Noise......................2-3
Noise Rejection..........................2-3
2.6 Setting of Shift step....................2-3
2.7 Selection of Zoom......................2-3
2.8 Setting of Zoom Range..............2-4
2.9 Setting of Zoom Start .................2-4
2.10 Preset of Range.........................2-4
Easy registration method of
the range....................................2-5
2.11 Setting of Background Color......2-5
2.12 Setting of White Line..................2-5
2.13 Setting ofAlarm..........................2-6
Stopping the alarm sound..........2-6
Setting the alarm........................2-7
Release the alarm......................2-7
Confirm the alarm state..............2-7
2.14 Preset/ WPT edit/ WPT delete of
Waypoint....................................2-8
NAV Start....................................2-8
Cancel the NAV..........................2-8
Edit the destination.....................2-8
Delete the waypoint....................2-9
Recall the stored image and
preset it as a destination............2-9
2.15 Store/Recall/Deletion of Image 2-10
Store the image........................2-10
Recall the stored image ...........2-10
Delete the stored image...........2-11
Add the comment to the stored
image........................................2-11
2.16 Explanation of Sonar................2-12
Switch-over of Sona-ToneTM.....2-12
Connection of External
Speaker....................................2-12
2.17 Explanation of Menu Item ........2-12
Inner-hull..................................2-12
TVG..........................................2-13
Change the TX power..............2-13
Change the Pulse width...........2-13
Change the Bandwidth.............2-14
D. Range..................................2-14
Display Width ...........................2-14
Display the A scope / Stop the
display of A scope ....................2-14
Change the display color of echo
sounder image .........................2-14
Change the depth value...........2-15
Display the depth unit / Stop the
display of depth unit.................2-15
Display the water temp graph /
Stop the display of water temp
graph........................................2-15
Setting of the background color of
NAV display..............................2-15
Setting of the echo sounder
display at NAV display..............2-15
Image Swap.............................2-15
Display the Operation guide /
Stop the display of Operation
guide.........................................2-15
Display the detection area /
Stop the display of detection
area..........................................2-16
Setting of Scale display............2-16
Change the scale value............2-16
Change the image direction.....2-16
Setting of Depth measurement 2-16
Change the display color..........2-16
Setting of Key lock ...................2-17
Change the scale type .............2-17

CVS-128/128B Contents
0093112802-06 vii
Change the bottom color .........2-17
Change the image partition......2-17
Display the frequency / Stop the
display of frequency.................2-17
Selecting a display area of fish
symbol indication .....................2-17
Chapter 3 How to use the menu2............3-1
3.1 Display of Menu.........................3-1
Display the menu.......................3-1
Return to the normal menu........3-1
3.2 Setting of External Input/Output.3-1
Buzzer Setting............................3-1
Temp Source..............................3-1
Speed Source............................3-1
Baud Rate..................................3-1
NMEA Monitor............................3-2
NMEA Output Data .................... 3-2
3.3 Setting of Correction Item..........3-2
Draft Set.....................................3-2
Sonic Speed...............................3-2
Water Temp................................3-2
Boat Speed ................................3-2
Directivity angle (Low/High).......3-2
Bubble........................................3-3
Bubble time set..........................3-3
3.4 Setting of Basic Set Item ...........3-3
Language...................................3-3
Range & Speed Unit..................3-3
Depth Unit..................................3-3
Temperature Unit .......................3-3
Local time Offset........................3-3
GPS select.................................3-3
GPS initialize..............................3-3
3.5 Maintenance Menu....................3-3
Simulation..................................3-3
Slide show..................................3-4
Initialize......................................3-4
System Check............................3-4
All WPTs deletes........................3-4
All stored image deletes ............3-4
Bottom start................................3-4
Past image.................................3-4
Inner-hull....................................3-4
TD select....................................3-4
3.6 Setting of Adjust2 Item...............3-4
STC strength adjust Low / High.3-4
STC depth adjust Low / High.....3-4
Color adjust................................3-5
Image speed adjust....................3-5
Bottom limit................................3-5
Sounding....................................3-5
3.7 Frequency select........................3-5
Frequency select (Low / High)...3-5
Power frequency adjustment.....3-5
Chapter 4 Maintenance and Inspection ..4-1
4.1 Inspection...................................4-1
4.2 Cleaning.....................................4-1
CVS-128/128B Display unit.......4-1
Transducer.................................4-1
4.3 Fuse Replacement.....................4-2
4.4 If you suspect a trouble..............4-2
4.5 Diagnostic Test...........................4-3
Diagnose....................................4-3
Confirm the version....................4-3
Return to the menu....................4-3
Chapter 5 Installation..............................5-1
5.1 Items of Caution on Installation .5-1
Unpacking the components .......5-1
Inspection of components and
accessories................................5-1
Decision of Installing Location...5-1
Laying and Connection of Cable5-2
Confirmation after Installation....5-2
5.2 Installation of CVS-128/128B
Display unit................................5-3
Desk-top Installation ..................5-3

Contents CVS-128/128B
viii 0093112802-06
Flush-mount Installation.............5-5
5.3 Installation of Transducer...........5-6
In case of Inner-hull....................5-6
In case of Through hull...............5-7
5.4 Wiring.........................................5-8
Connection of Cable to
CVS-128/128B Display unit........5-8
Pin Assignment of Rear
Connector...................................5-8
Connection of Power Cable .......5-9
Connection of Transducer........5-10
Connection with external
equipment.................................5-11
Connection with GPS-20A .......5-11
Connection with Speed Sensor or
Water Temperature Sensor
(Option) ....................................5-12
Connection of External Speaker
for Sona-ToneTM
(Prepared by a customer) ........5-13
Connection of External Monitor
(J7) (Prepared by a customer).5-13
5.5 Serial Data................................5-14
Input Data.................................5-14
Output Data..............................5-14
Chapter 6 TableAttached........................ 6-1
6.1 Menu List....................................6-1
6.2 Specification...............................6-5
6.3 Appearance................................6-7

CVS-128/128B Introduction
0093112802-06 ix
Introduction
The CVS-128/128B is a Dual frequency 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 boat 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*, boat 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)
CVS-128B is the high sensitivity model with broadband transducer. This model can be used at your
optimum frequencies within the specification of the broadband transducer. You can set 2
frequencies depending on a target fish or intended purpose during operation.

System Configuration CVS-128/128B
x 0093112802-06
System Configuration
Connection Diagram
CVS-128
Transducer P66 (Dual frequency combination type 50 / 200 kHz)
Plastic made. E
q
ui
pp
ed with Transom.
(
Owner su
pp
l
y)
Red
Black
Note: To use the water temperature sensor / speed sensor,
The wiring of transducer connector has to be changed.
Water temperature senso
r
CVS-128/128B Display unit
With mounting bracket and hard cove
r
External power output (For GPS etc)
External speaker (For speaker with amplifier)
External navigation equipment,
+
-
Connection to the Transduce
r
Connection to the wate
r
Connection to the speed sensor
ST-80/90/100
To Transducer connector To POWER connector
Standard configuration
Option
Owner supply
(J6 connector)
(Owner supply)
To External monitor connector
(J7 connector) External monitor
CW-576-0.5M (Owner supply)
CW-264A-2M
10.8 to 31.2VDC
CW-840-0.3M
Legend
external water temperature mete
r
Temperature
/
speed senso
r
NMEA circuit input output
CVS-128
Transducer TD-501C (Dual frequency combination type 50 / 200 kHz)
Rubber mold made. Equipped with Inner-hull/Ship’s bottom/Ship’s side.
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. E
q
ui
pp
ed with Inne
r
-hull.
CVS-128B
Transducer TDM-071 (38 to 75 kHz)
Transducer TDM-091D (42 to 65 kHz) (130 to 210 kHz)
Urethane mold made. Equipped with Ship’s bottom/Ship’s side

CVS-128/128B Configuration of Equipment
0093112802-06 xi
Configuration of Equipment
Standard Equipment Configuration List
No. Name of item Type Remark Weight/
Length Quantity
1 Display unit
CVS-128/128B With mounting bracket
and knob 3.2 kg 1
2 Hard cover
E57MB11060 250 g 1
3 DC power cable
(Combined cable)
CW-264A-2M With 12 connector at
one end/ un-treated at
the other end
2 m 1
4 Fuse
F-7161-3A
Cylinder (ø 6.4x30) Normal fusion type for main power 2
5 Cap
LTWCAP-DABCFXC1 For transducer cable
connector 1
6 Operation Manual CVS-128.OM.E English 1
7 Quick Reference CVS-128.QR.E English 1
8 Cautionary Note CVS-SER.RM.E English 1
Essential Option
No. Name of item Type Remark Weight/
Length Quantity
1 Transducer Type of transducer transducer cable (with
connector at one end) 1

Configuration of Equipment CVS-128/128B
xii 0093112802-06
Type of transducer
No. Specification Frequency Material /
Length of the
cable
Mounting method Beam width
(Right and left x
back and forth)
1
TD-500T-2B
CVS-128
50/200 kHz
600 W
Plastic
9m
Inner-hull
50kHz 50°x50° ( -6dB)
200kHz
17°x17° ( -6dB)
2
TD-500T-3B
CVS-128
50/200 kHz
600 W
Bronze
9m
Through-hull 50kHz
50°x50° ( -6dB)
200kHz
17°x17° ( -6dB)
3
TD-501C
CVS-128
50/200 kHz
1 kW
Rubber mold
10m
Inner-hull/
Ship’s bottom/
Ship’s side
(The CW-840-0.3M is
needed)
50kHz
58°x20° ( -6dB)
200kHz
17°x 6° ( -6dB)
4
TD-501T-3B
CVS-128
50/200 kHz
1 kW
Bronze
9m
Through-hull 50kHz
20°x22° ( -6dB)
200kHz
5°x 5° ( -6dB)
5
TDM-071
CVS-128B
38 to 75 kHz
Urethane mold
15m
Through-hull
Ship’s bottom/
Ship’s side
With water
temperature sensor.
38kHz
30°x20° ( -6dB)
75kHz
16°x 10° ( -6dB)
6
TDM-091D
CVS-128B
42 to 65 kHz
130 to210kHz
Urethane mold
15m
Through-hull
Ship’s bottom/
Ship’s side
With water
temperature sensor.
42kHz
35° ( -6dB)
65kHz
22° ( -6dB)
130kHz
14° ( -6dB)
210kHz
8° (-6dB)
AIRMAR’s Transducer model P66 is also applicable. (Owner supply)
1
P66
CVS-128
50/200 kHz
600 W
Plastic
10m
Transom
With water
temperature sensor
and speed sensor.
(The CW-840-0.3M is
needed)
50kHz
69°x69° ( -6dB)
200kHz
16°x16° ( -6dB)
Caution: For Inner-hull installation, an Inner-hull kit is necessary.

CVS-128/128B Configuration of Equipment
0093112802-06 xiii
Option List
No. Name of Item Specification Remark Weight/Length
1 Water temperature
sensor/speed sensor ST-80 For transom mounting Plastic made (with cable) 0.3 kg / 9 m
ST-90 For through-hull mounting
Plastic made (with cable) 0.6 kg / 9 m
ST-100 For through-hull mounting
Bronze made (with cable) 1.2 kg / 9 m
2 GPS sensor GPS-20A-10M-B
[KODEN] For GPS measuring (With power & signal cable) 0.25 kg / 10 m
3 Inner-hull kit MFB-04 Plastic made for installing the
transducer TD-500T-2B 1.3 kg
MFB-04W Plastic made for installing the
transducer TD-501C 1.3 kg
4 Cable for transducer CW-840-0.3M Needed when using the
optional water temperature
sensor / speed sensor. 30 cm
5 Connector for GPS
sensor LTWBD-06PMMP-LC Needed when using the GPS-20A (Type B) sensor.
6 Cable for external
monitor CW-576-0.5M Junction cable for connection of
external monitor 0.5 m

Change the frequency CVS-128/128B
xiv 0093112802-06
Change the frequency
CVS-128B is used with the other transducer please make sure to set the below items manually in line
with the transducer installed.
Caution: The transducer may be damaged if the settings are wrong.
Caution: There are occasions too much noise is generated in a particular frequency to
be connected.
Caution: Fish symbol operation cannot be generated at the other frequencies than the
high frequency of 200 kHz and the low frequency of 50 kHz.
Setting of Output Frequency (CVS-128B)
1 Press the [MENU] key.
2 Select [Freq] [Freq select (L)]. (See [2.1 How to operate the menu])
3 Press the [ ] key.
4 Set the output frequency at the low frequency side. (Press the [ ] key or [ ] key)
5 Set the high frequency also in the same way as for the low frequency side, in reference to the step
2 to 4.
6 Press the [MENU] key. Then, the edit is finished.
Caution: When single transducer is connected, set the same frequencies for low and
high.
Setting of Power Frequency (CVS-128B)
1 Press the [MENU] key.
2 Select [Freq] [Power freq adj]. (See [2.1 How to operate the menu])
3 Press the [ ] key.
4 Set the power supply frequency. (Press the [ ] key or [ ] key)
The recommended power supply frequency for Dual frequency (50 kHz/200 kHz): 107.0 kHz
Transmit
frequency
Recommended
power supply
frequency
Transmit
frequency
Recommended
power supply
frequency
28 kHz 115.0 kHz 70 kHz 106.5 kHz
38 kHz 105.0 kHz 75 kHz 103.5 kHz
40 kHz 123.0 kHz 120 kHz 109.0 kHz
55 kHz 107.0 kHz - -
Caution: There may be much noise on the screen even for the recommended power
supply frequency depending on the transducer. In this case, set the power
supply frequency to reduce the noise on the screen.
Caution: Set the power supply frequency to reduce the noise on the screen, when the
other transmission frequency than above is used.

CVS-128/128B Change the frequency
0093112802-06 xv
5 Press the [MENU] key. Then, the edit is finished.
Adjustment of bottom detection
When the bottom can't be detected or when the bottom is of mud pool or seaweed, [Gain (TD)] shall be
turned up. When transfer to fish schools, etc. frequently occurs, [Gain (TD)] shall be turned down.
1 Press the [MENU] key.
2 Select [Adjust] [Gain(TD)]. (See [2.1 How to operate the menu])
3 Press the [ ] key. The image displays bottom only. It may show very strong fish targets.
4 Set a value to display the sea bottom continuously without interruption. For high frequency, turn
[GAIN (HF) knob] and for low frequency, turn [GAIN (LF) knob]
After the alteration of setting, please confirm the condition for some time.
Those adjustments are recommended to be performed at the site of use.
5 Press the [MENU] key. Then, the edit is finished.
Gain (TD)
Bottom
Gain (TD) L Gain (TD) H
L: 6.0 H: 6.0 R:M 12.0V

CVS-128/128B Chapter 1 Basic Operation
0093112802-06 1-1
[DISP]
Chapter 1 Basic Operation
1.1 How to use the key CVS-128/128B Display unit
Various setting can be done directly. The menu list closes automatically after the key operation of the
other keys than [menu].
No. Key Name Explanation
1 [F1] Recalls directly the item preset.
2 [EVENT] Notifies the external equipment of the present position. Presets the
menu. It begins a fishing hot spot.
3 [Cursor]
▲▼
Selects the menu item. Changes the set value.
Moves the VRM marker. Moves the marker for notifying the
event.Changes the shift.
4 [MENU] Opens or closes the menu.
5 [F2] Recalls directly the item preset.
6 [▲RANGE▼] Changes the range setting.
7 [GAIN(HF)
Knob]
Rotate: Changes the gain value.
Press: Recalls the gain select.
8 [GAIN(LF)
Knob]
Rotate: Changes the gain value.
Press: Recalls the gain select.
9 Switches to the High frequency or Low frequency of echo sounder
image, zoom and navigation menu.
10 [BRILL ]/
Power
Press: Power on. Adjusts the brilliance and brightness of panel.
Long-press: Power off.
1
2
4
5
6
7
8
9
10
3

Chapter 1 Basic Operation CVS-128/128B
1-2 0093112802-06
How to remove the hard cover
While widening the claws at right and left sides of hard cover, draw the hard cover towards you.
When removing CVS-128/128B Display unit
To prevent dust from entering, cap the connector at the rear of CVS-128/128B 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-128/128B 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 and scratching.
Claw