KF-667
MODEL KF-667
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OPERATOR`S MANUAL
COLOR VIDEO SOUNDER
SAFETY INSTRUCTIONS
WARNING
ELECTRICAL SHOCK HAZARD
Do not open the equipment.
Only qualified personnel should work
inside the equipment.
Immediately turn off the power at the
switchboard if water leaks into the
equipment or something is dropped in
the equipment.
Continued use of the equipment can cause
fire or electrical shock. Contact a ONWA
agent for service.
Do not disassemble or modify the
equipment.
Fire, electrical shock or serious injury can
result.
WARNING
Make sure no rain or water splash leaks
into the equipment.
Fire or electrical shock can result if water
leaks in the equipment.
Keep heater away from equipment.
A heater can melt the equipment’s power
cord, which can cause fire or electrical
shock.
Use the proper fuse.
Fuse rating is shown on the equipment.
Use of a wrong fuse can result in damage
to the equipment.
Do not place liquid-filled containers on
the top of the equipment.
Fire or electrical shock can result if a liquid
spills into the equipment.
Immediately turn off the power at the
switchboard if the equipment is emitting
smoke or fire.
Continued use of the equipment can cause
fire or electrical shock. Contact a ONWA
agent for service.
WARNING
TABLE OF CONTENTS
INTRODUCTION
2.15 Alarms
2.16 White Marker
2-12
2-14
PRINCIPLE OF OPERATION
SYSTEM CONFIGURATION
1. CONTROLS, INDICATIONS
1.1 Control Description
1.2 Indications
2. BASIC OPERATION
2.1 Turning the Power On/Off
2.2 Adjusting Brilliance
2.3 Display mode Selection, Description
2.4 Adjusting Gain
2.5 Automatic Operation
2.6 Selecting Picture Advance Speed
2.7 Display Range selection
2.8 Erasing Weak Echoes
2.9 Measuring Depth to a Fish School
2.10 A-scope Display
2.11 Menu Operation
2.12 Suppressing interference
2.13 Suppressing Low Level Noise
2.14 Selecting Background
and Echo Colors
1-1
1-1
1-3
2-1
2-1
2-1
2-1
2-4
2-4
2-5
2-5
2-6
2-7
2-7
2-8
2-11
2-11
2-12
3. INTERPRETING THE DISPLAY
3.1 Zero Line
3.2 Fish School Echoes
3.3 Bottom Echo
3.4 Surface Noise/Aeration
3-1
3-1
3-1
3-1
3-2
4. MAINTENANCE, TROUBLESHOOTING
4.1 Maintenance
4.2 Basic Troubleshooting
4.3 Transducer Check
4.4 Water Temperature
Sensor (option) Check
4-1
4-1
4-3
4-4
MENU TREE
A-1
4-4
SPECIFICATIONS
SP-1
INDEX
Index-1
INTRODUCTION
Congratulations on your choice of the ONWA KF-667 Color Video Sounder. We are
confident that you will enjoy many years of operation with this fine piece of equipment.
The KF-667 is just one of the many ONWA developments in the field of echo sounding. The
compact, lightweight but rugged unit is easy to install and operate and is suitable for both fresh
and saltwater applications.
This unit is designed and constructed to withstand the rigors of the marine environment.
However, to obtain optimum performance from this unit, you should carefully read and follow the
recommended procedures for operation and maintenance. No machine can perform to the
utmost of its ability unless it is installed, operated and maintained properly
We would appreciate feedback from you, the end-user,about whether we are achieving our
purposes.
Thank you for considering and purchasing ONWA equipment.
Features
The KF-667 dual-frequency(50KHz and 200KHz)color video sounder has a large variety of
functions, all contained in a splash-proof rugged plastic case that is compact to fit small boats.
The principal features of the KF-667 are
User-friendly design for simplified operation.
A wide variety of display modes: bottom-lock expansion, marker zoom and unique bottom
zoom displays.
Potent 300 W transceiver.
8-color presentation(including background) on a 5.6 diagonal TFT LCD, providing vivid
presentation of underwater conditions.
AUTO function permits unattended range and gain setting operations. The range scale and
gain change automatically so that the bottom is displayed in reddish brown or red on the
lower half of the screen.
A-scope display gives excellent bottom fish discrimination, vital for bottom trawler
and lobster/crab potter.
Digital and analog displays of navigational data.
Alarms: fish, bottom, water temperature (requires appropriate sensor).
Six pulse lengths for excellent performance on both shallow and deep ranges.
Universal 12-24 VDC power supply drawing 30 W of power at maximum.
Water temperature sensor optionally available.
PRINCIPLE OF OPERATION
This Color Video Sounder determines the distance between its transducer and underwater
objects such as fish, lake bottom or seabed and displays the results on a 5.6-inch color screen.
It does this by utilizing the fact that an ultrasonic wave transmitted through water travels at a
nearly constant speed of 4800 feet (1500 meters) per second. When a sound wave strikes an
underwater object such as fish or sea bottom, part of the sound wave is reflected back toward
the source. Thus by calculating the time difference between the transmission of a sound wave
and the reception of the reflected sound wave, the depth to the object can be determined. In a
sense an echo sounder can be thought of as being an extremely sophisticated and quick timer,
since it is capable of resolving time differences shorter than one thousandth of a second.
The entire process begins in the display unit. Transmitter power is sent to the transducer as a
short pulse of electrical energy. The electrical signal produced by the transmitter is converted into
an ultrasonic signal by the transducer and transmitted into the water. Any reflected signals from
intervening objects (such as a fish school) are received by the transducer and converted back
into an electrical signal. It is then amplified in the amplifier section, and finally, displayed on the
screen.
The picture displayed by the Color Video Sounder is made up of a series of vertical scan lines,
one for each transmission, Each line represents a snapshot of what has occurred beneath the
boat. The series of snapshots are accumulated side by side across the screen, and the resulting
contours of the bottom and fish between the bottom and surface are displayed. The amount of
history of objects that have passed beneath the boat over a series of transmission varies from
less than a minute to a few minutes, depending on how you adjust the unit.
0
50
100
150
200
250
SYSTEM CONFIGURATION
DISPLAY UNIT
KF-667
Ship’s mains
12-24 VDC
TRANSDUCER
External equipment
(GPS navigator, etc.)
Temperature sensor (option)
Transducer
TX
GND
TX
TD/Temp
Temp GND
Temp in
TX
GND
TX
NC
NC
GND
Fuse(3A)
Power
DC12-24V
-VE
I/O
NMEA-0183 input(RX+)
NMEA-0183 input(RX )
NMEA-0183 output(TX+)
NMEA-0183 output(TX )
GND
3.3V
NC
TD
1. CONTROLS, INDICATIONS
1.1 Control Description
The equipment is so designed that even a first time user can quickly become acquainted with the
operating procedure. Operation of each control or key is acknowledged by an alphanumeric
message or symbol indication on the screen.
Control
SHIFT-,SHIFT+
(Appears in text as [-],[+].)
Function
Change display start depth.
Select options on menus.
ADVANCE (BRILL+AUTO)
Pressing the BRILL and AUTO keys together
selects display advancement speed.
BRILL
Adjusts brilliance of display.
AUTO
Turns the automatic sounder adjustment feature on/off.
A-SCOPE
(SIG LEV+ALARM)
Pressing the SIG LEV and ALARM keys together displays the
A-scope display at the right 1/4 of the screen.
SIG LEV
Eliminates low intensity echoes (up to light-blue echoes) in
two steps.
ALARM
Open/closes the alarm menu.
MARKER ,MARKER
(Appears in text as[ ]or[ ])
Shift the Variable Range Marker (VRM).
Set alarm zone.
Select menu items.
Set white marker.
RANGE
Sets the basic range of the display.
GAIN
Adjusts receiver sensitivity.
MODE
Turns unit on/off
Selects display mode.
1-1
Change display start depth.
Select options on menus.
Adjusts brilliance of display.
Pressing the SIG LEV +
ALARM keys together.
Displays the A-scope display
at the right 1/4 of the screen.
Pressing the BRILL + AUTO
keys together. Selects display
advancement speed.
BRILL
AUTO
SIG LEV
ALARM
Eliminates low intensity echoes
(up to light-blue echoes)
in two steps.
Turns the automatic sounder
adjustment feature on/off.
Open/closes the alarm menu.
Shift the Variable Range Marker (VRM).
Set alarm zone.
Select menu items.
Set white marker.
Sets the basic range
of the display.
Adjusts receiver sensitivity.
200/50 200K/Z 50K/Z
50K
MENU1
200K
MENU2
POWER
OFF
Turns unit on/off
Selects display mode
1-2
1.2 Indications
Auto Mode
Mode
Noise Limiter
Picture Advance Speed
Signal Level
Nav data*
Speed*
Water
temperature
Voltage
Water temperature
scale*
Water temperature
marker*(Color
changes with
HUE setting.)
Range scale
Alarm zone
marker
Variable range
marker(green)
w/depth readout
Color bar
All indications and
markers are displayed
in white unless
noted otherwise.
Depth
Requires external equipment.
1-3
2.BASIC OPERATION
2.1 Turning the Power On/Off
Turn the [MODE] switch clockwise to turn the power on. The unit starts with the settings used
before it was turned off last time. To turn the power off, turn the switch fully counterclockwise.
2.2 Adjusting Brilliance
Use the [BRILL] key to adjust the brilliance. The selected brilliance level is shown on the display
as below. There are six levels of brilliance including off.
BRILL:0
2.3 Display Mode Selection, Description
2.3.1 Display mode selection
Seven display modes are available and you may select one of them with the [MODE] switch.
MODE switch description
MODE Switch
Position
Function
200K
Provides the high frequency (200KHz)normal picture on the full screen.
50K
Displays the low frequency (50KHz)normal picture on the full screen.
200/50
Displays the normal display for high frequency (200KHz) on right half
and that for the low frequency (50KHz)on the left half.
200K/Z
Shows the normal display of the high frequency (200KHz) on right half
and its zoom display on the left half.
50K/Z
Provides the normal display of the low frequency (50KHz)on right half
and its zoom display on the left half.
MENU1
Displays the main and system menus.
MENU2
Displays the main and system menus.
2-1
2.3.2 Display mode description
200K, 50K (high frequency, low frequency) mode
The sounder uses ultrasonic pulses to detect bottom conditions. The lower the frequency of
the pulse the wider the detection area. Therefore, the 50KHz frequency is useful for general
detection and judging bottom conditions, while the 200KHz frequency is useful for detailed
observation of fish schools.
DUAL frequency mode
This mode provides the 50KHz picture on the left-half of the screen and the 200KHz on the right
half, and is useful for detecting fish schools which have different reflection characteristics with
frequency. For example, a school of tiny fish like minnow returns stronger echoes on a high
frequency compared to a low frequency.
2-2
ZOOM mode (high or low frequency)
Three types of zoom displays are available: marker zoom, bottom-lock expansion,
bottom zoom. The zoom mode to be used can be selected on the main menu with ZOOM MODE.
Normal
display
Variable range
marker(green)
This section
is zoomed
This mode expands selected area of the normal picture to
full vertical size of the screen on the left-half window. You
may specify the portion to expand with the VRM (Variable
Range Marker), which you can shift with [ ]or [ ]. The
area between the VRM and the zoom range marker is
expanded. The length of the segment is equal to one
division of the depth scale.
Marker-zoom Zoom marke
(yellow)
display
MARKER ZOOM
Zoom marker (yellow)
Normal
display
This display provides a compressed normal picture on the
top 2/3 of the screen and a 5 or 10 meter (10 or 20 feet)
wide layer in contact with the bottom is expanded onto the
bottom 1/3 of the screen. This mode is useful for bottom
discrimination. Note that the seabed should be steadily
and distinctly plotted in red or reddish-brown. Adjust the
gain if necessary.
Note1:The bottom-lock range can be selected on the
system menu.
Note2:The zoom marker can be turned on/off on the
system menu.
Bottomlock
display
BOTTOM-LOCK
This mode expands bottom and bottom fish echoes two to
five times to vertical size of the screen, and it is useful for
determining bottom hardness. A bottom displayed with a
short echo tail usually means it is a soft, sandy bottom. A
long echo tail means a hard bottom.
Zoom
marker
(yellow)
The zone automatically moves so that the bottom echoes
locate on the lower half of the screen.
Note1:The amount of expansion can be selected on the
system menu.
Note2:The zoom marker can be turned on/off on the
system menu.
Bottom-zoom
display
Normal
display
BOTTOM ZOOM
2-3
2.4 Adjusting Gain
The [GAIN] control adjusts the sensitivity of the receiver. Adjust it so that a slight amount of noise
remains on the screen. Generally, use a higher gain setting for greater depths and a lower
setting for shallower waters.
Note: The [GAIN] control is inoperative when the automatic mode is active.
Gain too high
Gain proper
Gain too low
2.5 Automatic Operation
Automatic operation is useful when you are preoccupied with other tasks and do not have time to
adjust the display.
2.5.1 How it works
The automatic function automatically selects the proper gain and range scale according to depth.
It works as follows:
The range changes automatically to locate the bottom on the lower half of the screen. It
jumps to one step shallower range when bottom echoes reach a halfway point of the full scale
from top and to one step deeper range when they come to the lower edge of the scale.
The gain is automatically adjusted to display the bottom echo in reddish-brown (default color
arrangement).
Clutter level (on the main menu), which suppresses low level noise, is automatically adjusted.
2.5.2 Enabling automatic operation
Two types of automatic modes are available:AUTO1,for fishing, and AUTO2,for cruising.
Since cruising uses a higher clutter rejection setting than fishing, it is not recommended for
detection of fish because weak fish echoes may be deleted by clutter rejection. Note that the
[SHIFT] keys([+],[-]), [RANGE] switch and [GAIN] control are inoperative in the auto mode.
Press the [AUTO] key. Each press of the key turns the auto function on or off in the sequence
shown below
AUTO-1
(FISH MODE)
2-4
AUTO-2
(CRUISE MODE)
AUTO OFF
2.6 Selecting Picture Advance Speed
The picture advance speed determines how quickly the vertical scan lines run across the screen.
When selecting a picture advance speed, keep in mind that a fast advance speed will expand the
size of the fish school horizontally on the screen and a slow advance speed will contract it.
1.Press the [BRILL] and [AUTO] keys together. The display should look something like the one
below. The fraction shown on the display denotes number of scan lines produced per
transmission. For example, 1/8 means one scan line is produced every eight transmissions.
0 freezes the display and it is convenient for observing an echo.
ADVANCE:1
(1/8)
2.Continue pressing the [BRILL] and [AUTO] keys together to select desired speed.
2.7 Display Range Selection
The basic range and range shifting functions used together give you the means to select the
depth you can see on the screen. The basic range can be thought of as providing a window
into the water column and range shifting as moving the Window to the desired depth.
Shift
Display
2.7.1 Basic range selection
The basic range may be selected with the [RANGE] switch from the eight ranges shown in the
table below.
Table 1-1 Basic ranges(default settings)
Range No
1
2
3
4
5
6
7
8
Meters
5
10
20
40
80
150
200
300
Feet
15
30
60
120
200
400
600
1000
Fathoms
3
5
10
20
40
80
100
150
Passi/Braza(P/B)
3
5
10
30
50
100
150
200
2-5
Operate the [RANGE] switch and the display shown below appears. Adjust the [RANGE] control
again to select a basic range.
RANGE: 30
Note:The [RANGE] switch is inoperative when the auto function is active.
2.7.2 Range shifting
The basic range may be shifted up or down with the [SHIFT] keys ([+],[-]). Press a [SHIFT] key
and the display shown below appears. Press a [SHIFT] key again to select the amount of shift.
SHIFT: 0
Note 1: The maximum shift range is 1000 feet (300 m). However, actual range will depend on
underwater conditions. In the worst case echoes will not appear
Note 2: Basic ranges can be changed on the system menu.
Note 3: The unit of depth may be selected on the system menu.
Note 4: The range cannot be shifted when the auto function is active.
2.8 Erasing Weak Echoes
Dirty water or reflections from plankton may be painted on the display in green or light-blue.
These weak echoes may be erased as follows:
1.Press the [SIG LEV] key. The following display appears.
SIGLV:1
2.Press the [SIG LEV] key again to select signal level (echo color) to erase. Every pressing
deletes the weakest color echoes on the screen, up to the light-blue echoes. You may
identify the deleted colors on the color bar; deleted colors disappear from the color bar. The
selected level is shown as SL1, SL2 or Sl3 at the screen. Signal level 0 disables
this function.
2-6
2.9 Measuring Depth to a Fish School
The VRM (Variable Range Marker) functions to measure the depth to fish schools or other echo.
1.Press[ ]or[ ]to place the VRM on an echo.
2.Read the VRM range just above the VRM.
2.10 A-scope Display
This display shows echoes at each transmission with amplitudes and tone proportional to their
intensities, on the right 1/4 of the screen. It is useful for estimating the kind of fish school and
bottom composition. To turn the A-scope display on or off press the [SIG LEV] and [ALARM]
keys together.
Normal
display
A-scope
display
2-7
2.11 Menu Operation
The menu, consisting of the main menu and system menus, contains less often used
functions which do not require frequent adjustment.
2.11.1 Menu selection
1.Set the [MODE] switch in the MENU1 position.
NOISE LIMITER
OFF 1 2 3
HUE SELECTION
1 (1 - 7)
GAIN ADJUST 200KHz
0 (-20 - +20)
GAIN ADJUST 50KHz
0 (-20 - +20)
CLUTTER LEVEL
0* (0 - 3)
ZOOM MODE (B.LOCK)
M/Z
B/L
B/Z
MARKER (VRM)
VRM WHT
/ :TO SELECT ITEM -/+:TO SET CONDITION
2-8
*A shown when
auto mode in
active.
2.Set the [MODE] switch in the MENU2 position.
3. To go to page 2 of the system menu, select B/L RANGE with [ ] and press [ ] again.
SYSTEM MENU
SYSTEM MENU
DEPTH : m ft fa PB
ZOOM MARK : OFF ON
F/A LEVEL:
WEAK MED STRG
RANGE1: 15
RANGE2: 30
RANGE3: 60
RANGE4: 120
RANGE5: 200
RANGE6: 400
RANGE7: 600
RANGE8: 1000
ZOOM RANGE: 2 3
B/L RANGE: 10 20
SPEED : kt
TEMP :
MPH
KPH
/ :TO SELECT ITEM.
-/+:TO SET CONDITION.
4
5
/ :TO SELECT ITEM
-/+:TO SET CONDITION
4.Press[ ]or[ ]to select menu item.
5.Press[+]or[-] to set condition.
6.Set the [MODE] switch in any other position to register selection and close the menu.
2.11.2 Main menu description
Menu item
description
NOISE LIMITER
Eliminates noise from other echo sounders and electrical
interference.
HUE SELECTION
Selects colors for echoes and background.
GAIN ADJUST
(50KHZ,200KHZ)
Adjusts the gain for both high and low frequencies. Changing
this setting by 10 is equal to changing the GAIN control by 1.If
the sensitivity is too low or the auto function does not work
properly when the transducer is installed inside hull, try to
adjust the gain here.
CLUTTER LEVEL
Eliminates blue dots which are mainly caused by unclean
water, from the screen.
ZOOM MODE
Selects the type of zoom display. B/L, Bottom-Lock;B/Z,
Bottom Zoom, and M/Z, Marker Zoom.
MARKER
Selects which marker to use; VRM or white marker.
2-9
2.11.3 System menu description
Menu item
Description
System Menu
DEPTH
ZOOM MARK
Turns zoom range and expansion range markers on/off.
F/A LEVEL
Sets fish alarm level.
WEAK: Alarm against weak to strong echoes.
MED: Alarm against medium to strong echoes.
STRG: Alarm against strong echoes only.
RANGE 1-8
Sets basic ranges. Change when default ranges are not satisfactory.
ZOOM RANGE
B/L RANGE
2-10
Selects unit of depth measurement; meters, feet, fathoms, passi/braza.
Selects range scale for bottom zoom and marker zoom displays.X2,for
example, expands echoes to double size relative to those on the normal
display.
Selects range for bottom-lock expansion display.
SPEED
Selects unit of speed measurement; knots, miles per hour,
kilometers per hour.
TEMP
Selects unit of temperature measurement; Celsius and Fahrenheit.
2.12 Suppressing Interference
Interference from other acoustic equipment operating nearby or other electronic equipment on
your boat may show itself on the display as shown below.
To suppress interference, do the following:
1.Select MENU1 with the [MODE ]switch.
2.Select NOISE LIMITER.
3.Press [+] or [-] to select degree of suppression desired. 3 provides the highest degree of
suppression.
Interference from
other sounder
Electrical interference
Turn the noise limiter circuit off when no interference exists, otherwise weak echoes may be
missed.
2.13 Suppressing Low Level Noise
Light-blue dots may appear over most of screen. This is mainly due to unclean water or noise.
This noise can be suppressed by adjusting CLUTTER on the menu.
When the automatic mode is on, the clutter suppression setting is fixed at AUTO. To suppress
low level noise in manual sounder operation do the following:
1.Select MENU1 with the [MODE] switch.
2.Select CLUTTER LEVEL.
3.Press [+] or [-] to select degree of suppression desired, 3 provides the highest degree of
suppression.
Low level noise
2-11
2.14 Selecting Background and Echo Colors
1.Select MENU1 with the [MODE] switch.
2.Select HUE SELECTION.
3.Press [+] or [-] to select hue arrangement desired, referring to the table below.
Hue options
Hue Ho. Background color
Echo color
1
Blue
7 colors, bottom reddish-brown
2
Blue
6 colors, bottom red
3
Black
7 colors, bottom reddish-brown
4
Black
6 colors, bottom red
5
White
7 colors, bottom reddish-brown
6
White
6 colors, bottom red
7
Black
Monochrome yellow, 8 intensities
2.15 Alarms
2.15.1 Alarm description
Bottom alarm
The bottom alarm sounds when the bottom is within the alarm range set. To activate the bottom
alarm the depth must be displayed.
Fish alarm
The fish alarm sounds when fish of a certain strength are within the preset alarm range. The
echo strength which triggers the fish alarm can be selected on the MENU2 with F/A LEVEL.
Water temperature alarm
There are two types of water temperature alarms: IN and OUT. The IN alarm sounds when the
water temperature is within the range set; the OUT alarm sounds when the water temperature is
higher than the range set. This alarm requires water temperature data.
2-12
2.15.2 Activating/deactivating an alarm
1.Prees the [ALARM] key to display the alarm menu.
BOTTOM
ALARM ZONE:
RANGE:
0
---
ON
5
5
FISH
ALARM ZONE:
RANGE:
OFF
0
---
ON
5
5
TEMP
ALARM ZONE:
RANGE
OFF
32
IN
---
/
-/+
OUT
37
5
TO SELECT ITEM.
TO SET CONDITION.
2.Press [ ] or [ ] to select an alarm
.
3.Press [+]to select ON, IN or OUT.(For the water temperature alarm, select IN to get the
alarm when the water temperature is within the alarm zone range, or OUT to get the alarm
when the water temperature is higher than the alarm zone range.)
4.Press [ ] to select ALARM ZONE.
5.Adjust width of alarm zone with [+] or [-].
Alarm
zone
Alarm zone marker
(Fish, bottom alarms only)
Alarm icon (Appear when alarm is violated.)
6.Press [ ] to select RANGE.
7.Use [+] to [-] to set display range for the alarm.
To deactivate an alarm, select OFF at step 3 in the above procedure.
2.15.3 Silencing the buzzer
When an alarm is violated, the buzzer sounds and the alarm icon and name of alarm violated
(see illustration above) appear on the display. You can temporarily silence the buzzer by
Pressing the [ALARM] key. However, the buzzer will sound the next time the alarm setting is
violated.
2-13
2.16 White Marker
The white marker functions to display a particular echo color in white. For example, you may
want to display the bottom echo (reddish-brown) in white to discriminate fish echoes near the
bottom. Note that the bottom must be displayed in reddish-brown for the white marker to
function.
1.Set the [MODE] switch in the MENU1 position.
2.Press [ ] select MARKER field.
3.Select WHT from the MARKER field.
4.Set the [MODE] switch in desired mode position.
5.Press [ ] or [ ] to select color to display in white. The indication WHITE MARKER appears.
As you press those keys the white cursor on the color bar shows the color currently selected
to display in white.
White cursor shows
color currently displayed
in white.
2-14
3. INTERPRETING THE DISPLAY
3.1 Zero Line
Zero
line
The zero line (sometimes referred to as the transmission line)
represents the transducer`s position, and moves off the screen
when a deep phased range is used.
Shift
3.2 Fish School Echoes
Fish school echoes will generally be plotted between the zero
line and the bottom. Usually the fish school/fish echo is
weaker than the bottom echo because its reflection property is
Size of
much smaller compared to the bottom. The size of the fish
fish
school
school can be ascertained from the density of the display.
3.3 Bottom Echo
Echoes from the bottom are normally the strongest and
are displayed in reddish-brown color (in default color
arrangement) but the color and width will vary with
bottom composition, water depth, frequency, sensitivity,
etc.
In a comparatively shallow depth, a high gain setting will
cause a second or sometimes a third or a fourth echo to
be displayed at the same interval between them below
the first echo trace. This is because the echo travels
between the bottom and the surface twice or more in
shallow depths.
Intensity
difference in
water depth
Second bottom
echo
Rock base
The color of the bottom echo can be used to help
determine the density of the bottom materials (soft or
hard). The harder the bottom, the wider the trace. If the
gain is set to show only a single bottom echo on mud, a
rocky bottom will show a second or third bottom return.
The range should be chosen so the first and second
bottom echoes are displayed when bottom hardness is
being determined.
Mud
and sand
3-1
3.4 Surface Noise/Aeration
When the waters are rough or the boat passes over a wake, surface noise may appear near the
zero line. As surface turbulence is acoustically equivalent to running into a brick wall, the bottom
echo will be displayed intermittently. Similar noise sometimes appears when a water temperature
difference (thermocline) exists. Different species of fish tend to prefer different temperature
zones, so the thermocline may be useful to help identify target fish. 200KHz tends to show
shallow thermoclines better than 50KHz.
In rough waters the display is occasionally interrupted due to below-the-ship air bubbles
obstructing the sound path. This also occurs when the boat makes a quick turn or reverses
movement. Lowering the picture advance speed may reduce the interruption. However,
reconsideration of the transducer installation may be necessary if the interruption occurs
frequently.
Surface noise
Caused by
aerated water
Thermocline
3-2
4. MAINTENANCE,TROUBLESHOOTING
WARNING
ELECTRICAL SHOCK HAZARD
Do not open the equipment.
Only qualified personnel should work
inside the equipment.
4.1 Maintenance
Regular maintenance is important for good performance. Following the recommended
maintenance procedures will help keep your set in good working condition.
4.1.1 General checking
Important points to be checked from time to time are tabulated below.
Maintenance check points
Check point
Action
Transducer cable
If conductors are exposed, replace cable.
Power cable plug/transducer cable plug
If loosened, tighten.
Display unit ground
If. corroded, clean
Ship’s mains voltage
If out of ratings, correct problem.
4.1.2 Replacement of fuse
The fuse on the power cable protects the equipment against overvoltage/reverse polarity of the
ship’s mains or internal fault of the equipment. If the fuse blows, find the cause before replacing
the fuse. If the fuse blows again after replacement, call for service. A fuse rated for more than 3A
should not be used since it would damage the equipment and void the warranty.
CAUTION
Use the proper fuse.
Use of a wrong fuse can cause fire or
equipment damage.
4-1
4.1.3 Cleaning
Keep the equipment clean and dry at all times. Dust or loose dirt should be wiped off with a soft,
dry cloth. Do not use chemical cleaners to clean the display unit-they can remove paint or
markings.
4.1.4 Maintenance of the transducer
Marine life on the transducer face will result in gradual decrease in the sensitivity. Check the
transducer face for cleanliness each time the boat is hauled out of the water. Carefully remove
any marine life with a piece of wood or fine sandpaper.
4-2
4.2 Basic Troubleshooting
The troubleshooting table below presents common problems and the means to restore normal
operation. If normal operation cannot be restored do not attempt to check inside the equipment.
Basic troubleshooting
If
Then
Neither echo nor fixed range scale appears
check battery voltage.
check fuse.
check battery terminal for corrosion.
check that power cable is securely
plugged.
No echo but range scale shows
check if display speed is set to"0".
check if transducer plug is firmly
connected.
Echo appears but no zero line
check if range shifting is set to “0".
The equipment shows signs of low sensitivity
check if gain setting is suitable.
check for air bubbles or marine life
attached to transducer.
check if water is dirty.
bottom may be too soft to return proper
echo.
No water depth readout is shown
check if bottom echo is painted red or
reddish-brown.
check if bottom is displayed.
Much noise or interference is present
check if transducer/transducer cable is too
close to engine
check unit ground.
check if there are other echo sounders of
the same frequency nearby.
Water temperature indication*is
absent or unrealistic
check that sensor plug is securely
fastened.
Position indication*is absent or unrealistic
check that equipment plug is securely
fastened.
check position-fixing equipment.
*Requires external equipment
4-3
4.3 Transducer Check
A simple and reliable check of the transducer is to temporarily replace the transducer with a new
one. If the sensitivity is considerably improved through this change, the transducer is probably
faulty. This method is especially useful for inside-hull or through-hull installation.
Another method is to listen to the transmission sound. Haul the transducer from the water and
turn on the power. Put your ear near the transducer face and carefully listen to the transmission
sound. If you can hear a clicking sound, the transducer is probably normal. Next, rub the
transducer face with your hand and observer whether noise appears on the screen. The
appearance of noise indicates the transducer is normal. In case of neither sound nor noise, the
transducer is probably faulty.
4.4 Water Temperature Sensor (option) Check
The idea of the transducer check can apply to this case, too; temporarily substitute a new sensor.
If the temperature indications become normal, your sensor may be faulty.
When a new sensor is not available, the water temperature indication should change when you
touch the thermosensor.
4-4
MENU TREE
MENU1
MENU2
SYSTEM MENU
NOISE LIMITER
OFF 1 2 3
HUE SELECTION
1 (1 - 7)
GAIN ADJUST 200KHz
0 (-20 - +20)
GAIN ADJUST 50KHz
0 (-20 - +20)
CLUTTER LEVEL
0* (0 - 3)
ZOOM MODE (B.LOCK)
M/Z
B/L
B/Z
VRM
DEPTH : m ft fa PB
ZOOM MARK : OFF
ON
F/A LEVEL:
WEAK MED STRG
RANGE1: 15
RANGE2: 30
RANGE3: 60
RANGE4: 120
RANGE5: 200
RANGE6: 400
RANGE7: 600
RANGE8: 1000
ZOOM RANGE: 2 3
B/L RANGE: 10 20
MARKER (VRM)
WHT
4
5
/ :TO SELECT ITEM
-/+:TO SET CONDITION
/ :TO SELECT ITEM -/+:TO SET CONDITION
Press[ ]
key.
Press[ ]
key.
SYSTEM MENU
Default setings are circumscribed.
SPEED :
TEMP :
DEFAULT CONTROL SETTINGS
SHIFT:
0
BRILL:
6
ADVANCE:
4
SIGLEV:
0
ALARM:
OFF
A-SCOPE:
OFF
MARKER:
0
kt
MPH
KPH
/ :TO SELECT ITEM.
-/+:TO SET CONDITION.
A-1
SPECIFICATIONS ON COLOR VIDEO SOUNDER
KF-667
1.GENERAL
1 Display
2 Echo Color
3
4
5
6
7
8
9
10
11
12
5.6-inch TFT LCD
8 colors (including background color) according to echo intensity.
Monochrome display is also available. The background color is
selectable from blue, light blue, white and black.
Basic Range
Meters 5/10/20/40/80/150/200/300
Feet 15/30/60/120/200/400/600/1000
Fathoms 3/5/10/20/40/80/100/150
Passi/Braza 3/5/10/30/50/100/150/200
The basic ranges can be changed on the system menu.
Range Shift
Up to 300 meters (1000 feet,150fathoms,200 passi/braza
Zoom Range
Times 2,3,4 and 5ranges
Bottom Lock Expansion Range
5/10meters,10/20feet,2/5fathoms,2/5passi/braza
Auto Mode
Automatic adjustment of range and gain
Display Mode
High Frequency (200K),Low Frequency (50K), Dual (200K
and 50K 1/2display on each), Zoom (200K and 50K zoom)
and A-scope Display
Zoom Display
Marker Zoom, Bottom Zoom and Bottom-lock Expansion
Display Advance Speed Lines/TX:Freeze,1/8,1/4,1/2,1/1,2/1
TX Frequency Output power
50 and 200kHz (alternately transmitted), 300W
Pulse-length/TX rate
Display End Depth(m)
Pulse-Length(ms)
TX Rate(pulse/min)
13 Interfernce Rejecter
14 Alarm
15 Input/output data
Input
Output
5
0.2
600
10
0.2
600
20
0.2
600
40
0.4
375
80
0.8
187
150
1.5
100
300
3.0
50
Rejects unwanted signals by comparing last and present echoes
in strength.
Fish and Bottom alarms, Temperature alarm*
NMEA 0183
RMC, VTG
SDDBT, SDDPT
*: Temperature sensor required.
SP-1
2.POWER SUPPLY
1 Display Unit
12-24 VDC -10%,+30% : 1.0 - 0.6 A
3.ENVIRONMENTAL CONDITION
1 Ambient Temperature 0 to +50
2 Relative Humidity
85% at 40
3 Water proofing
Display Unit:IPX4
4 Vibration
1mm 10%, 2(5) to 13.2Hz,
Maximum acceleration 7 m/s 2, 13.2 to 100Hz
4.COATING COLOR
1 Display Unit
Chassis: 2.5GY5/1.5
Panel: N3.0 Newtone No.5
SP-2
INDEX
Aeration
Alarms
activating
bottom
fish
silencing buzzer
water temperature
A-scope display
AUTO key
Automatic operation
Background color
Bottom alarm
Bottom echoes
Bottom zoom mode
Bottom-lock mode
BRILL key
Brilliance
Checking
Cleaning
Clutter
Depth measurement
Display mode
dual frequency mode
Echo color
Fish alarm
Fish school echoes
Fuse replacement
GAIN control
200K, 50K mode
Hue
3-2
2-13
2-12
2-12
2-13
2-12
2-7
2-4
2-4
2-12
2-12
3-1
2-3
2-3
2-1
2-1
4-1
4-2
2-11
2-7
2-1
2-2
2-12
2-12
3-1
4-1
2-4
2-2
2-12
Index-1
Indications
Interference
Marker zoom mode
Menu
Menu1
Menu2
Menu1 description
Menu2 description
Menu tree
MODE switch
Noise limiter
Picture advance speed
Power on/off
Principle of operation
RANGE switch
SHIFT keys
SIG LEV key
Surface noise
System menu
Transducer
checking
maintenance
Troubleshooting
VRM
Water temperature alarm
Water temperature graph
Water temperature sensor check
White marker
Zero line
Zoom mode
1-3
2-11
2-3
2-8
2-9
2-8
2-10
A-1
2-1
2-11
2-5
2-1
2-5
2-6
2-6
3-2
2-10
4-4
4-2
4-3
2-7
2-12
2-10
4-4
2-14
3-1
2-3