Furuno FCV-600L User manual

C
9-52, Ashihara-cho,
Nishinomiya, Japan
Telephone: [phone]
Telefax: 0798-65-4200
Your Local Agent/Dealer
All rights reserved.
PUB. No. OME-23620
FCV-600L
(DAMI)
FIRST EDITION :APR.1998
H3:OCT. 7, 2002
Printed in Japan

iiiiiiiiiiiii
i
SAFETY INSTRUCTIONS
WARNING
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.
Use only a 3A fuse. Use of a wrong fuse
can result in equipment damage and void
the warranty.
The TFT LCD is constructed using the
latest LCD techniques, and displays
99.99% of its pixels. The remaining 0.01%
of the pixels may drop out or blink, how-
ever this is not an indication of malfunc-
tion.
About the TFT LCD
WARNING
Immediately turn off the power at the
switchboard if water leaks into the
equipment.
Continued use of the equipment can cause
fire or electrical shock. Contact a FURUNO
agent for service.
Do not disassemble or modify the
equipment.
Fire, electrical shock or serious injury can
result.
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 FURUNO
agent for service.
Make sure no rain or water splash leaks
into the equipment.
Fire or electrical shock can result if water
leaks in the equipment.
Do not open the equipment.
ELECTRICAL SHOCK
HAZARD. Only qualified per-
sonnel should work inside
the equipment.
CAUTION
A warning label is attached to the
equipment. Do not remove the label.
If the label is peeling off or is illegible,
contact a FURUNO agent or dealer.

ii
FOREWORD.......................................iii
MENU TREE ....................................... iv
SYSTEM CONFIGURATION....... v
PRINCIPLE OF OPERATION.... vi
OPERATIONAL OVERVIEW
1.1 Control Description ............................... 1
1.2 Indications, Markers .............................. 2
1.3 Turning On/Off the Power ..................... 3
1.4 Adjusting Tone and Brilliance ............... 3
1.5 Selecting a Display ................................ 3
1.6 Selecting Display Range........................ 7
1.7 Adjusting the Gain ................................. 7
1.8 Automatic Operation.............................. 8
1.9 Selecting Picture Advance Speed .......... 8
1.10 Erasing Weak Echoes .......................... 9
1.11 Measuring Depth ................................. 9
1.12 A-scope Display................................. 10
1.13 User Menu ......................................... 10
1.14 Suppressing Interference ................... 11
1.15 Suppressing Low Level Noise........... 11
1.16 Selecting Background and
Echo Colors ....................................... 11
1.17 Alarms................................................ 12
1.18 White Marker..................................... 13
1.19 Fine Adjustment of Gain in
Dual-Frequency Operation ................ 13
OPTIONAL MODE
2.1 Displaying the Optional Mode Menu .. 15
2.2 System Menu ....................................... 15
2.3 Demonstration Display ........................ 17
2.4 Bottom Level ....................................... 17
2.5 TVG Level........................................... 18
2.6 Echo Offset .......................................... 18
TABLE OF CONTENTS
INTERPRETING THE DISPLAY
3.1 Zero Line ............................................. 19
3.2 Fish School Echoes.............................. 19
3.3 Bottom Echo ........................................ 19
3.4 Surface Noise/Aeration........................ 20
MAINTENANCE &
TROUBLESHOOTING
4.1 Checking.............................................. 21
4.2 Cleaning the Display Unit ................... 21
4.3 Transducer Maintenance...................... 21
4.4 Replacing the Fuse............................... 21
4.5 Troubleshooting ................................... 22
4.6 Test....................................................... 23
4.7 Test Pattern .......................................... 23
4.8 Clearing the Memory........................... 24
SPECIFICATIONS....................... SP-1

iii
A Word to FCV-600L Owners
Congratulations on your choice of the
FURUNO FCV-600L Color LCD Sounder.
We are confident you will see why the
FURUNO name has become synonymous
with quality and reliability.
For over 50 years FURUNO Electric Com-
pany has enjoyed an enviable reputation for
innovative and dependable marine electron-
ics equipment. This dedication to excellence
is furthered by our extensive global network
of agents and dealers.
This equipment is designed and constructed
to meet the rigorous demands of the marine
environment. However, no machine can per-
formits intendedfunction unlessoperated and
maintainedproperly.Pleasecarefully readand
follow the recommended procedures for op-
eration and maintenance.
We would appreciate hearing from you, the
end-user, about whether we are achieving our
purposes.
Thank you for considering and purchasing
FURUNO equipment.
FOREWORD
Features
TheFURUNOFCV-600Lis a dual-frequency
(50 kHz and 200 kHz) color LCD sounder.
Comprised of a display unit and a transducer,
theFCV-600Ldisplaysunderwater conditions
in 16 colors (including background) on a
bright 5.6-inch color TFT (Thin Film Tran-
sistor) LCD.
The main features of the FCV-600L are
• Compact design permits installation where
space is limited.
• Bright 5.6-inch color LCD with tempera-
ture compensated tone and brilliance con-
trol.
• Wide variety of display modes: bottom
lock,dualfrequency, marker zoom, bottom
zoom, nav data and graphic display.
• Automatic function permits unattended
adjustment of range and gain. The range
scale and gain automatically change to dis-
play the bottom in reddish-brown on the
lower half of the screen.
• Navigation data display (requires naviga-
tion data input from external navigator)
provides position, course, speed, depth,
temperatureand waypoint data indications.
• Alarms: Bottom, Fish (bottom-lock, nor-
mal), Temperature (within, over range set).
• A-scope display discriminates bottom fish,
vital for bottom trawler and trap users.
• Waterproof construction permits installa-
tion on open bridge.
• Universal 10.2–31.2 VDC power supply
consuming less than 15 W power.

iv
MENU TREE
MENU
ESC NOISE LIMITER (OFF, NL1, NL2, NL3)
CLUTTER (0~16) Default: 9
MARKER (VRM,WHITE MARKER)
HUE (1~9) Default:1
GAIN ADJ 200kHz (-20~+20) Default: 0
GAIN ADJ 50kHz (-20~+20) Default: 0
GO TO SYSTEM MENU (s)
SELF TEST (t)
USER
MENU
MENU (1, 2, 3)
DEPTH UNIT (m, ft, fa, pb)
SPEED UNIT (kt, MPH, km/h)
TEMP UNIT (°C, °F)
ZOOM MARK (OFF, ON)
F/A LEVEL (WEAK, MED, STRG)
TEMP GRAPH (OFF, ON)
LANG (English, Others)
DISP SEL (GRA1,GRA2)
DRAFT(-20~+20) Default:0
POWER
Any
key +
MENU (1, 2, 3)
NAV DSP (OFF, L/L, R/B, CSE)
NMEA (Ver1.5, Ver2.0)
BEARING (TRUE, MAG)
SPD SEL (OFF, OWN, NMEA)
TMP SEL (OFF, OWN, NMEA)
SPD ADJ (-50~+50) Default: 0
TMPADJ (-20~+20) Default: 0.0
CLEAR MEMORY (▲)
DEMO (▼)
OPTIONAL MODE
Default settings
shown in bold.
SYSTEM MENU 2
MENU (1, 2, 3)
BASIC RANGE1 (15)
BASIC RANGE2 (30)
BASIC RANGE3 (60)
BASIC RANGE4 (120)
BASIC RANGE5 (200)
BASIC RANGE6 (400)
BASIC RANGE7 (600)
BASIC RANGE8 (1500)
ZOOM RANGE (range: 7-1500, 30) (feet)
B/L RANGE (10, 20) (feet)
All basic ranges
in feet.
ECHO OFFSET (SIG LEV key 3 times)
TVG SELECT (A-SCOPE key 3 times)
BOTTOM LEVEL (ALARM key 3 times)
TEST PATTERN (BRILL key 3 times)
SYSTEM MENU 3
SYSTEM MENU 1

v
SYSTEM CONFIGURATION
Ship's mains
12-24 VDC
External equipment
(GPS navigator, etc.)
TRANSDUCER
Speed, temperature
sensor (option)
DISPLAY
UNIT
FCV-600L system configuration

vi
The FCV-600L determines the distance be-
tween its transducer and underwater objects
such as fish, lake bottom or seabed and dis-
plays the results on its screen. It does this by
utilizingthe fact that an ultrasonic wavetrans-
mitted through water travels at a nearly con-
stant speed of 4800 feet (1500 meters) per
second. When a sound wave strikes an un-
derwater object such as fish or sea bottom,
part of the sound wave is reflected back to-
ward 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.
The entire process begins in the display unit.
Transmitter power is sent to the transducer as
a short pulse of electrical energy. The electri-
cal signal produced by the transmitter is con-
verted into an ultrasonic signal by the
transducer and transmitted into the water.Any
returning signals from intervening objects
(such as a fish school) are received by the
transducerand converted into an electrical sig-
nal. The signals are then amplified in the am-
plifier section, and finally, displayed on the
screen.
The picture displayed is made up of a series
of vertical scan lines, one for each transmis-
sion. Each line represents a snapshot of what
has occurred beneath the boat. Series of snap-
shots are accumulated side by side across the
screen, and the resulting contours of the bot-
tom and fish between the bottom and surface
are displayed.
PRINCIPLE OF OPERATION
Underwater conditions and video sounder display

1
OPERATIONAL OVERVIEW
1.1 Control Description
All operations of the FCV-600L are carried out with the controls on the front panel of the
display unit. All controls respond immediately to your command and the unit emits a beep to
signify correct key sequence. (Invalid key input emits several beeps.)
MENU
ESC
SHIFT
-SHIFT +
RANGE
-RANGE
+
GAIN
-GAIN +
ALARM
SIG
LEV
AUTO
BRILL
POWER
A
SCOPE
•Opens/closes user
menu. (p. 10)
•Escapes from current
operation.
Note:
This key may be
pressed after the com-
pletion of most oper-
ations to clear the
screen immediately.
Turns A-scope
display on/off.
(p. 10)
Removes weak echoes
from the display. (p. 9)
Adjusts display brilliance
and tone. (p. 3)
Turns power on/off. (p. 3)
Turns automatic operation on/off.
(p. 8)
Selects picture advance speed.
(p. 8)
Enables/disables alarms.
(p. 12)
Adjust gain. (p. 7)
Select basic display range. (p. 7)
Shift basic display range. (p. 7)
Selects display mode. (p. 3)
Cursor Pad
•Shifts variable range marker.
(p. 9)
•Selects menu items.
(p. 10)
ADVANC
MODE
Figure 1-1 Controls

2
1.2 Indications, Markers
The figure below shows all indications and markers which may appear in the normal display.
The combination displays (normal display plus marker or zoom display) may additionally dis-
play the zoom marker.
Water
temperature*
Speed*
Noise Limiter
Transducer frequency
Alarm icon
Active alarm
Range scale
Variable range
marker (green)
w/depth readout
Depth
Color
bar
Water temperature
scale*
Minute marker
(yellow, blue,
30 sec. each)
Nav data*
(DEMO)
Demonstration
mode
Alarm zone
marker
35°15.000’ N
135°07.500’ E
22.6°C 12kt NL1 200k F/NM
0
20
40
60
80
49.6
39.8
30
10
Water temperature
marker (orange)*
* Requires appropriate sensor.
0
20
All indications and
markers are displaye
d
in white unless
noted otherwise.
Figure 1-2 Indications

3
1.3 Turning On/Off the Power
Press the POWER key to turn the power on/
off. When the unit is turned on it proceeds in
the sequence shown below.
Sounder
display
ROM and RAM
check; displayed for
several seconds.
** Program version
no.
ROM: OK
RAM: OK
PROGRAM No: 02522800**
200k 0
20
40
60
80
49.6
0.0
You may press any key to show
the sounder display immediately.
Figure 1-3 Start-up sequence
Note: Wait at least five sec. before reapply-
ing the power.
1.4 Adjusting Tone and Brilliance
1. Press the BRILL key. The tone and bril-
liance setting display appears.
TONE : 5
BRILL : 7
LOWtsHIGH
LOW HIGH
Figure 1-4 Tone and brilliance
setting display
2. Press tor sto adjust display tone.
3. Press ▲or ▼to adjust display brilliance.
Note: Tone or brilliance must be adjusted
within about 10 seconds after pressing the
BRILL key or the tone and brilliance display
will be erased.
1.5 Selecting a Display
Seven displays are available: normal (50 or
200 kHz), dual frequency, marker zoom, bot-
tomzoom, bottom lock, data,and graphic. (An
A-scope display is also available with the A-
SCOPE key.)
1. Press the MODE key.
▲
▼
t
SELECT SOUNDER MODE
MODE: SEL ESC: CLOSE
NORMAL
DUAL
MARKER ZOOM
BOTTOM ZOOM
BOTTOM LOCK
DATA
GRAPHIC
50kHz 200kHzs
Figure 1-5 Select sounder mode screen
2. Press the MODE key again to select a
sounder mode. You may also select a
sounder mode by pressing ▲(upward)
or ▼ (downward).
3. Press the MENU ESC key to conclude
your selection.
Normal display
50 kHz
The sounder uses ultrasonic pulses to detect
bottom conditions. The lower the frequency
of the pulse, the wider the detection area.
Therefore, the 50 kHz frequency is useful for
general detection and judging bottom condi-
tion.
50 kHz
200 kHz
Figure 1-6 Comparison of detection ranges
of 50 kHz and 200 kHz transducers

4
50k
49.6
0.0
Fish
school
Bottom
0
20
40
60
80
Figure 1-7 Typical 50 kHz normal display
200 kHz
The higher the frequency of the ultrasonic
pulse the better the resolution. Therefore, the
200 kHz frequency is ideal for detailed ob-
servation of fish schools.
Dual-frequency display
The 50 kHz picture appears on the left; the
200 kHz picture on the right. This display is
useful for comparing the same picture with
two different transmitting frequencies.
50/200
60
49.6
0.0
50 kHz 200 kHz
picture picture
0
20
40
80
0
20
40
Figure 1-8 Dual-frequency display
Marker-zoom display
This mode expands selected area of the nor-
mal picture to full vertical size of the screen
on the left-half window.You may specify the
portion to expand by operating the VRM
(Variable Range Marker), which you can shift
with ▲ or▼.The area between the VRM and
zoom range marker is expanded. The length
of the segment is equal to one division of the
depth scale.
14.7
0
10
20
30
40
15
20
25
28.2
Zoomed fish
school
Normal
display
Variable range
marker (green)
This section
is zoomed
Zoom marker
(yellow)
Marker-zoom
display
Fish
school
Figure 1-9 Marker-zoom display
plus normal display

5
Bottom-zoom display
This mode expands bottom and bottom fish
echoes two to five times to vertical size of the
screen, and is useful for determining bottom
hardness. A bottom displayed with a short
echo tail usually means it is a soft, sandy bot-
tom. A long echo tail means a hard bottom.
0
10
20
30
40
15
20
25
36.4
Normal
display
Zoom
marker
(yellow)
Bottom
Bottom-zoom display
Figure 1-10 Bottom-zoom display plus
normal display
Bottom-lock display
The bottom-lock display provides a com-
pressed normal picture on the right half of the
screenand a 5 or 10 meter (10 or 20 feet) wide
layer in contact with the bottom is expanded
onto the left half of the screen. This mode is
useful for bottom discrimination.
9.6
0
10
20
30
40
5
4
3
2
1
0
Fish
20.7
Bottom-
lock
display
Normal
display
Zoom marker (yellow)
Zoomed
fish
This section
is zoomed
Figure 1-11 Bottom-lock display plus
normal display
Note: The zoom marker is not displayed in
the default setting. It may be turned on in Sys-
tem menu 1. For further details see page 15.
Data display
This display provides navigation data in digi-
tal form. Position, course, speed, depth, wa-
ter temperature and waypoint data can be
shown. Requires nav data input and appro-
priate sensors.
0
20
40
60
80
30 ° 00. 065’N
130
° 00. 574’E
POS
143 ° 15. 6kt
CSE SPD
69. 4 m9. 3°C
DEP TMP
WP ABC
RNG 12nm
BRG 123. 4°
XTE 1. 23nm
Position
Course, speed
Depth,
temperature
Waypoint
Range to waypoint
Bearing to waypoint
Cross-track error
Figure 1-12 Data display

6
Enlarging a nav data indication
You can enlarge and display one of the data
indications as follows:
1. Press ▲or ▼to select the indication you
want to display. A blue cursor circum-
scribes your selection. For example, se-
lect the waypoint data window.
2. Press sto enlarge the data.
0
20
40
60
80
WP
ABC
RNG
12.0 nm
BRG
123. 4 °
XTE
1. 23 nm
Figure 1-13 WP data window enlarged
3. To return to the full data display, press t.
Graphic displays
There are two types of graphic displays and
you can select which one to display on the
SYSTEM MENU1.
Graphic display 1
This display provides analog and digital dis-
plays of cross-track error (XTE), course and
bearing. It is useful for monitoring progress
toward a waypoint.The XTE scale in the cen-
ter of the display, graduated in increments of
0.1 nm, shows cross-track error, the direction
and distance the boat is off course. In the ex-
ample below the XTE marker (red) shows the
boat is off course by 0.2 nm starboard. There-
fore you would steer left by the same distance
to return to course.
DEP
69.4 m
TMP
18. 1 °C
RNG
12.0 nm
TRIP
76.8 nm
WP
ABC
SPD
16.8 kt
1nm 1nm
BRG
248
°
CSE
323
°
N
WE
Waypoint
Range to
waypoint
Depth
Speed
Trip
distance
Temperature
XTE
scale
Bearing to waypoint
Bearing
Course
Course
indicator
0
20
40
60
80
Figure 1-14a Graphic display 1
Figure 1-14b Graphic display 2
Resetting trip distance on graphic displays
The trip distance indication displays the dis-
tance the boat has traveled. To reset the indi-
cation to zero, press tor suntil the
indication reads zero.

7
1.6 Selecting Display Range
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 “win-
dow” into the water column and range shift-
ing as moving the “window” to the desired
depth.
Display
Shift
Figure 1-15 Range and display shift concept
Basic range selection
The basic range may be selected with the
RANGE keys from the eight ranges shown in
the table below.
Table 1-1 Basic ranges (default settings)
inUt egnaRyalpsiD
1234567 8
sreteM501020408051002005
teeF5103060210020040060051
smohtaF3501020408001052
azarB/issaP35010305001051003
Press a RANGE key and the display shown
below appears. Press a RANGE key again to
select a basic range.
RANGE 5m
Figure 1-16 Range display
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 0m
Figure 1-17 Shift display
Note 1: The RANGE and SHIFT keys are in-
operative in automatic operation. See next
page for details.
Note2:The maximum shift range is 1500 feet
(500 m). However, actual range will depend
on underwater conditions. In the worst case
echoes will not appear.
1.7 Adjusting the Gain
The GAIN keys adjust the sensitivity of the
receiver. Adjust them 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.
Gain too high Gain proper Gain too low
Figure 1-18 Examples of proper and
improper gain
Press a GAIN key and the display shown be-
low appears. Press a GAIN key again to ad-
just the gain. Note that the GAIN keys are
inoperative in automatic operation.
GAIN (2.1)
Low High
—
+
Figure 1-19 Gain setting display

8
1.8 Automatic Operation
Automatic operation is useful when you are
preoccupied with other tasks and do not have
time to adjust the display.
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 dis-
playthe bottom echo in reddish-brown (de-
fault color arrangement).
• Clutter level (on the User menu), which
suppresseslow level noise, is automatically
adjusted.
Two types of automatic modes
Two types of automatic modes are available:
cruising and fishing. Cruising is for tracking
the bottom; fishing is for searching fish
schools. Since cruising uses a higher clutter
rejection setting than fishing, it is not recom-
mended for fish detection – weak fish echoes
may be deleted by clutter rejection. Note that
the SHIFT, RANGE and GAIN keys are in-
operative in the auto mode.
How to enable automatic operation
1. Press the AUTO key.The auto mode dis-
play appears.
AUTO MODE
▲
▼
OFF
CRUISING
FISHING
Figure 1-20 Auto mode display
2. Press theAUTO key again to select Cruis-
ing or Fishing.
3. Press the MENU ESC key.
1.9 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 hori-
zontally on the screen and a slow advance
speed will contract it.
1. Press the ADVANC key. The following
display appears.
▲
▼
ADVANCE
STOP
1/16
1/8
1/4
1/2
1/1
2/1
Figure 1-21 Picture advance
speed selection display
The fractions in the menu denote number
of scan lines produced per transmission.
For example, 1/8 means one scan line is
produced every 8 transmissions. STOP
freezes the display and it is convenient for
observing an echo.
2. Press the ADVANC key again to select
speed desired.
3. Press the MENU ESC key.

9
1.10 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.
SIGNAL LEVEL
OFF
SL1
SL2
SL3
SL4
SL5
SL6
▲
▼
SIGNAL LEVEL
OFF
SL1
SL2
SL3
▲
▼
(At 16-color display)
(At 8-color display)
Figure 1-22 Signal level display
2. Press the SIGLEVkey again to select sig-
nal level (echo color) to erase. The color
deleted disappears from the color bar and
is replaced with dark-blue color. SL1
erases the weakest echo; SL6 the light-
blue echo.
3. Press the MENU ESC key.
Weak
echoes
Signal level
adjusted
Figure 1-23 How SIG LEV works
1.11 Measuring Depth
TheVRM (Variable Range Marker) functions
to measure the depth to fish schools, etc.
1. Press ▲or ▼to place the VRM on an
echo.
2. Read theVRMrange justabovethe VRM.
200k 0
20
40
60
80
49.6
0.0
39.8
VRM (green)
Figure 1-24 How to measure depth
with the VRM

10
1.12 A-scope Display
This display shows echoes at each transmis-
sion with amplitudes and tone proportional to
their intensities, on the right 1/3 of the screen.
It is useful for estimating the kind of fish
school and bottom composition.
32.3
10
20
30
40
A-scope
display
Normal
display
200k0.0
0
Figure 1-25 A-scope display
1. Press the A-SCOPE key. The A-SCOPE
selection display appears.
A-SCOPE
OFF
ON
▲
▼
Figure 1-26 A-scope selection display
2. Press ▲or ▼to select OFF or ON.
3. Press the MENU ESC key.
1.13 User Menu
The User menu has several functions which
require adjustment according to operating
conditions.
1. Press the MENU ESC key to display the
User menu.
0 -20 +20
1 1 9
OFF NL1 NL2 NL3
NOISE LIMITER
CLUTTER
AUTO 0 16
VRM WHITE MARKER
MARKER
HUE
GAIN ADJ 200kHz
0 -20 +20
GAIN ADJ 50kHz
▲▼ : To select item
ts : To set condition
Figure 1-27 User menu
2. Press▲or ▼to select menu item.As you
operate ▲or ▼, the selected item and its
current setting are displayed in yellow.
3. Press tor s to set condition.
4. Press the MENU ESC key to close the
menu.

11
1.14 Suppressing Interference
Interference from other acoustic equipment
operating nearby or other electronic equip-
ment on your boat may show itself on the dis-
play as shown in Figure 1-28.
To suppress interference, do the following:
1. Press the MENU ESC key to display the
User menu.
2. Select NOISE LIMITER.
3. Press tor sto select degree of suppres-
siondesired;OFF, NL1, NL2 or NL3.The
higher the number the greater the degree
of suppression.
4. Press the MENU ESC key.
Interference from Electrical inteference
other sounder
Figure 1-28 Forms of interference
Turn the noise limiter circuit off when no in-
terference exists, otherwise weak echoes may
be missed.
1.15 Suppressing Low Level
Noise
Light-blue dots may appear over most of
screen. This is mainly due to dirty water or
noise. This noise can be suppressed by ad-
justing CLUTTER on the User menu.
When the automatic mode is on, the clutter
suppression setting is fixed atAUTO. To sup-
press low level noise in manual sounder op-
eration do the following:
1. Press the MENU ESC key.
2. Select CLUTTER.
3. Press tor sto select clutter rejection
level desired. The higher the number the
higher the degree of suppression. Note
that weak echoes may not be displayed
when the clutter circuit is on.
4. Press the MENU ESC key.
Figure 1-29 Clutter appearance
1.16 Selecting Background and
Echo Colors
1. Press the MENU ESC key.
2. Select HUE.
3. Press tor sto select hue arrangement
number. (You can see the result of your
selection behind the menu.) Table 1-2
showshue no., echo colorand background
color.
Table 1-2 Background and echo colors
euH .oN roloCohcEroloCdnuorgkcaB
1roloc61eulb-muideM
2roloc8eulb-muideM
3roloc61eulb-kraD
4roloc8eulb-kraD
5roloc61etihW
6roloc8etihW
7roloc61kcalB
8roloc8kcalB
9seitisnetni8,emorhconoM
4. Press the MENU ESC key.

12
1.17 Alarms
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
There are two types of fish alarms: bottom-
lock and normal. The bottom-lock fish alarm
sounds when fish are within a certain distance
from the bottom. The normal fish alarm
sounds when fish are within the preset alarm
range.
Water temperature alarm
There are two types of water temperature
alarms: IN and OUT. The IN alarm sounds
whenthe water temperatureis within the range
set; the OUT alarm sounds when the water
temperature is higher than the range set. This
alarm requires water temperature data.
Activating/deactivating an alarm
1. Press the ALARM key to display the
alarm setting display and select alarm
desired.
BOTTOM OFF ON
ALARM ZONE 0 5
RANGE 5
FISH (NORMAL) OFF ON
ALARM ZONE 0 5
RANGE 5
FISH (B/L) OFF ON
ALARM ZONE 22 21
RANGE 1
TEMP OFF IN OUT
ALARM ZONE 32 37
RANGE 5
▲▼ : To select item
ts: To set condition
Table 1-3 Alarm width data
mralA mralA )m(htdiW tluafeD )m(gnitteS
mottoB99-15
lamroN-hsiF99-15
L/B-hsiFeulavL/B-11
NIpmeT99-15
TUOpmeT99-15
Figure 1-30 Alarm mode display
2. Press sto select ON.
F/NM
Alarm
zone Alarm
zone
marker
(Fish,
bottom
alarms
only)
Figure 1-31 Alarm zone
3. Press ▼to set ALARM RANGE.
4. Presstor sto change alarm zone as de-
sired.
5 Press ▼ to set RANGE.
6. Presstor sto change range as desired.
7. To deactivate an alarm, select OFF.
Note : For fish alarm set “F/A LEVEL”. See
page15.
Silencing the buzzer
The buzzer sounds whenever an alarm is vio-
lated. You can temporarily silence the buzzer
by pressing the ALARM key. However, the
buzzer will sound whenever the alarm setting
is violated.