Furuno FCV-668 User manual

i
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 FURUNO
agent for service.
Do not disassemble or modify the
equipment.
Fire, electrical shock or serious injury can
result.
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 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.
CAUTION
A warning label is attached to the equip-
ment. Do not remove the label. If the
label is missing or illegible, contact
a FURUNO agent or dealer.
WARNING
To avoid electrical shock, do not
remove cover. No user-serviceable
parts inside.
Name: Warning Label (1)
Type: 86-003-1011-0
Code No.: 100-236-230
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.
Fuse rating is shown on the equipment.
Use of a wrong fuse can result in damage
to the equipment.

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TABLE OF CONTENTS
TABLE OF CONTENTS ...................................... ii
INTRODUCTION ................................................ iii
PRINCIPLE OF OPERATION.............................. v
SYSTEM CONFIGURATION .............................. vi
1. CONTROLS, INDICATIONS
1.1 Control Description ............................. 1-1
1.2 Indications .......................................... 1-2
2. BASIC OPERATION
2.1 Turning the Power On/Off ................... 2-1
2.2 Adjusting Brilliance.............................. 2-1
2.3 Display Mode Selection, Description ... 2-1
2.4 Adjusting Gain .................................... 2-6
2.5 Automatic Operation ........................... 2-6
2.6 Selecting Picture Advance Speed ....... 2-7
2.7 Display Range Selection ..................... 2-7
2.8 Erasing Weak Echoes......................... 2-8
2.9 Measuring Depth to a Fish School....... 2-9
2.10 A-scope Display.................................. 2-9
2.11 Menu Operation ................................ 2-10
2.12 Suppressing Interference .................. 2-13
2.13 Suppressing Low Level Noise ........... 2-13
2.14 Selecting Background and
Echo Colors ...................................... 2-14
2.15 Alarms .............................................. 2-14
2.16 White Marker .................................... 2-16
2.17 Demonstration Picture....................... 2-16
2.18 Correcting Speed/Water
Temperature Readout........................ 2-17
3. INTERPRETING THE DISPLAY
3.1 Zero Line ............................................ 3-1
3.2 Fish School Echoes ............................ 3-1
3.3 Bottom Echo ....................................... 3-1
3.4 Surface Noise/Aeration ....................... 3-2
4. MAINTENANCE, TROUBLESHOOTING
4.1 Maintenance ....................................... 4-1
4.2 Basic Troubleshooting......................... 4-3
4.3 Diagnostics ......................................... 4-4
4.4 Transducer Check ............................... 4-5
4.5 Speed/Water Temperature
Sensor (option) Check.........................4-5
4.6 Restoring Default Settings................... 4-5
MENU TREE ................................................... A-1
SPECIFICATIONS......................................... SP-1
INDEX

iii
INTRODUCTION
Congratulations on your choice of the FURUNO FCV-668 Color Video Sounder. We are
confident that you will enjoy many years of operation with this fine piece of equipment.
For over 50 years FURUNO Electric Company has enjoyed an enviable reputation for quality and
reliability throughout the world. This dedication to excellence is furthered by our extensive global
network of agents and dealers.
The FCV-668 is just one of the many FURUNO 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 FURUNO equipment.
Features
The FCV-668 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 FCV-668 are
•User-friendly design for simplified operation.
•A wide variety of display modes: bottom-lock expansion, marker zoom and bottom zoom
displays.
•Potent 300 W transceiver.
•8-color presentation (including background) on a 6" diagonal CRT, 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 red or reddish brown 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.

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•Alarms: fish, bottom, water temperature (requires appropriate sensor).
•Six pulselengths for excellent performance on both shallow and deep ranges.
•Universal 12-24 VDC power supply drawing 30 W of power at maximum.
•Water temperature/speed sensor optionally available.

v
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 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.

vi
SYSTEM CONFIGURATION
Standard supply
520-5PSC-A
Optional supply
520-5PWC
520-5MSC-A
520ST-PWA
524ST-MSA
Ship's mains
12-24 VDC
External equipment
(GPS navigator, etc.)
TRANSDUCER
SPEED, TEMPERATURE SENSOR (option)
Speed/temperature sensor
ST-02MSB
ST-02PSB
ST-01PTB
Temperature sensor
T-02MTB
T-02MSB
T-03MSB
DISPLAY UNIT
CV-668

1-1
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 Function
SHIFT-, SHIFT+
(Appears in text as [-], [+].) • Change display start depth.
• Select options on menus.
BRILL Adjusts brilliance of display.
AUTO Turns the automatic sounder adjustment feature on/off.
ADVANCE (BRILL + AUTO) Pressing the BRILL and AUTO keys together selects display
advancement speed.
SIG LEV Eliminates low intensity echoes (up to light-blue echoes) in two
steps.
ALARM Opens/closes the alarm menu.
A-SCOPE (SIG LEV +ALARM) Pressing the SIG LEV andALARM keys together displays the
A-scope display at the right 1/4 of the screen.
MARKER ▲, MARKER ▼
(Appears in text as [▲], [▼].) • 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.

1-2
1.2 Indications
Water
temperature*
Speed*
Noise Limiter
Picture Advance Speed
Signal Level
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*
Alarm zone
marker
35°15.000' N
135°07.500' W
AUTO-1
Alarm Icon
Auto Setting
Alarm Type
(F,B,TI,TB)
(DEMO)
Demonstration Mode
49.8˚F 12.5kt NL1 ç 1 SL1 0
20
40
60
80
49.6
39.8
Water temperature
marker* (Color
changes with
HUE setting.)
* Requires appropriate sensor.
All indications and
markers are displayed
in white unless
noted otherwise.
F
30
40
50
60
70