Furuno FSV-85-MARK-2 User manual

COLOR SCANNING SONAR
FSV-85 MARK-2
OPERATOR'S MANUAL
www.furuno.com
Model

The paper used in this manual
is elemental chlorine free.
・FURUNO Authorized Distributor/Dealer
9 52 Ashihara cho,
Nishinomiya, 662 8580, JAPAN
A
:
JUL
2021
.
Printed in Japan
All rights reserved.
B
:
JUN
.
10, 2022
Pub. No.
OME-13670-B
(
REFU
)
FSV-8 -MARK-2-70/80
0 0 0 1 9 8 9 0 2 1 1

i
IMPORTANT NOTICES
General
• This manual has been authored with simplified grammar, to meet the needs of international users.
• The operator of this equipment must read and follow the instructions in this manual.
Wrong operation or maintenance can void the warranty or cause injury.
• Do not copy any part of this manual without written permission from FURUNO.
• If this manual is lost or worn, contact your dealer about replacement.
• The contents of this manual and the equipment specifications can change without notice.
• The example screens (or illustrations) shown in this manual can be different from the screens you
see on your display. The screens you see depend on your system configuration and equipment
settings.
• Save this manual for future reference.
• Any modification of the equipment (including software) by persons not authorized by FURUNO will
void the warranty.
• The following concern acts as our importer in Europe, as defined in DECISION No 768/2008/EC.
- Name: FURUNO EUROPE B.V.
- Address: Siriusstraat 86, 5015 BT, Tilburg, The Netherlands
• The following concern acts as our importer in UK, as defined in SI 2016/1025 as amended SI 2019/
470.
- Name: FURUNO (UK) LTD.
- Address: West Building Penner Road Havant Hampshire PO9 1QY, U.K.
• All brand, product names, trademarks, registered trademarks, and service marks belong to their
respective holders.
How to discard this product
Discard this product according to local regulations for the disposal of industrial waste. For disposal in
the USA, see the homepage of the Electronics Industries Alliance (http://www.eiae.org/) for the
correct method of disposal.
How to discard a used battery
Some FURUNO products have a battery(ies). To see if your product has a battery, see the chapter
on Maintenance. If a battery is used, tape the + and - terminals of the battery before disposal to pre-
vent fire, heat generation caused by short circuit.
In the European Union
The crossed-out trash can symbol indicates that all types of batteries
must not be discarded in standard trash, or at a trash site. Take the
used batteries to a battery collection site according to your national
legislation and the Batteries Directive 2006/66/EU.
In the USA
The Mobius loop symbol (three chasing arrows) indicates that
Ni-Cd and lead-acid rechargeable batteries must be recycled.
Take the used batteries to a battery collection site according to
local laws.
In the other countries
There are no international standards for the battery recycle symbol. The number of symbols can in-
crease when the other countries make their own recycle symbols in the future.
Cd
Ni-Cd Pb

ii
SAFETY INSTRUCTIONS
Do not disassemble or modify the
equipment.
Fire, electrical shock or serious injury can
result.
Do not install the equipment where it
may be subject to rain or water splash.
Fire or electrical shock can result if water
leaks in the equipment.
Use the proper fuse.
Use of a wrong fuse can result in damage
to the equipment or cause fire.
Do not operate the equipment with
wet hands.
Electrical shock may 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.
Turn off the power immediately
if you feel the equipment is behaving
abnormally.
Turn off the power at the switchboard if
the equipment becomes abnormally warm
or is emitting odd noises. Contact a
FURUNO dealer or agent for advice.
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
into the equipment.
Continued use of the equipment can cause
fire or electrical shock. Contact a FURUNO
agent for service.
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.
WARNING
Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury.
Warning, Caution Mandatory Action
Prohibitive Action
WARNING
WARNING
DANGER
DANGER
Indicates a hazardous situation which, if not avoided, will result in
death or serious injury.
The operator of this equipment must read the safety instructions before attempting to operate
the equipment.
Keep away from raise/lower
shaft in hull unit when it is
moving.
Gears in hull unit will cause
serious injury.

SAFETY INSTRUCTIONS
iii
CAUTIONCAUTION
CAUTIONCAUTION
Maximum speed while the transducer is
projected and being raised or lowered
is as below, to prevent damage to the
transducer.
Replace anticorrosion zinc plate yearly.
Corrosion between the main shaft and
transducer may result if not replaced, allowing
water leakage and/or loss of transducer.
Observe the following precautions when
using industrial use lubricant.
Precautions
Q
Keep lubricant away from eyes. Wear protective
goggles when working with the lubricant.
The lubricant can cause inflammation of the eyes.
Q
Do not touch the lubricant. Wear protective gloves
when working with the lubricant. The lubricant can
cause inflammation of the skin.
Q
Do not ingest the lubricant. Diarrhea and vomiting
may result.
Q
Keep the lubricant out of reach of children.
Emergency procedures
Q
If the lubricant enters eyes, flush with clean water
about 15 minutes. Consult a physician.
Q
If the lubricant contacts skin, flush area with clean
water.
Q
If the lubricant is ingested, see a physician
immediately.
Disposal of lubricant and its container
Dispose of the lubricant and its container in accord-
ance with local regulations. If you are unclear about
the disposal procedure, contact a FURUNO agent or
dealer for advice.
Projected Raising/
Lowering
Max. 18 kn Max. 15 kn
WARNING LABELS
Warning labels are attached to the units of the system. Do not remove the labels.
If a label is missing or damaged, contact a FURUNO agent or dealer about replacement.
Name: Warning Label
Type: 10-079-6144
Code No.: 100-310-880-10
Name: Warning Label (1)
Type: 86-003-1011-3
Code No.: 100-236-233-10
Name: Finger Warning Label
Type: 06-021-4015
Code No.: 100-281-590-10
Name: Danger Label
Type: 10-089-7544-0
Code No.: 100-394-370-10
The LCD is made of glass. Do not
apply force or shock to the LCD.
Broken LCD glass can cause injury.

iv
EMERGENCY STOP BUTTON ON
HULL UNIT
The EMERGENCY STOP button on the hull unit stops the raising or lowering of the transducer in
case of an emergency. The transducer stops moving when the button is operated, a warning mes-
sage appears and the transducer cannot be raised or lowered. The transducer is also stopped
when the ratchet wrench in the hull unit, which is used to manually raise the transducer, is re-
moved from its holder.
To release the emergency stop condition, first confirm that no one is near the hull unit. Then do
the following:
• To release the EMERGENCY STOP button, turn the button in the direction of the arrow on the
button.
• Return the ratchet wrench to its holder.
EMERGENCY STOP button
(default position)

v
TABLE OF CONTENTS
FOREWORD.................................................................................................................... x
SYSTEM CONFIGURATION .......................................................................................... xi
1. OPERATIONAL OVERVIEW.................................................................................1-1
1.1 Controls Overview ......................................................................................................1-1
1.1.1 Control Unit ....................................................................................................1-1
1.1.2 Sub control unit (option) .................................................................................1-4
1.1.3 Remote controller (Option) .............................................................................1-4
1.2 Turning the Power On/Off...........................................................................................1-5
1.3 Raising/Lowering the Transducer...............................................................................1-5
1.3.1 Lowering the transducer.................................................................................1-6
1.3.2 Raising the transducer ...................................................................................1-7
1.3.3 How to check transducer protrusion...............................................................1-7
1.4 Screen Brilliance and Panel Dimmer..........................................................................1-8
1.5 Display Modes..........................................................................................................1-10
1.5.1 How to select a display mode.......................................................................1-11
1.5.2 Display mode pictures ..................................................................................1-12
1.6 Software Function Keys............................................................................................1-14
1.7 How to Adjust the Gain.............................................................................................1-15
1.8 How to Use the Menu...............................................................................................1-16
2. HORIZONTAL MODE ............................................................................................2-1
2.1 Basic Operating Procedure ........................................................................................2-1
2.2 Horizontal Display Overview.......................................................................................2-2
2.2.1 Horizontal mode, full-screen display ..............................................................2-2
2.2.2 Horizontal2 mode ...........................................................................................2-3
2.3 Display Range ............................................................................................................2-4
2.4 Tilt Angle.....................................................................................................................2-5
2.4.1 How to set the tilt angle ..................................................................................2-5
2.4.2 Automatic tilt...................................................................................................2-5
2.4.3 Relation between bottom echo and tilt angle .................................................2-7
2.4.4 Tilt angle for surface fish ................................................................................2-8
2.4.5 Suitable tilt angle ............................................................................................2-8
2.5 How to Measure Range and Bearing to a Target .......................................................2-9
2.6 How to Eliminate Weak Echoes .................................................................................2-9
2.7 How to Adjust Strong and Weak Echoes..................................................................2-12
2.7.1 AGC..............................................................................................................2-12
2.7.2 Near AGC.....................................................................................................2-12
2.7.3 2nd AGC.......................................................................................................2-13
2.7.4 How to shorten pulse length.........................................................................2-14
2.8 How to Suppress Bottom and Sea Surface
Reflections in Shallow Waters..................................................................................2-15
2.9 How to Reject Sonar Interference and Noise ...........................................................2-16
2.9.1 How to identify the noise source ..................................................................2-16
2.9.2 Change TX interval.......................................................................................2-16
2.9.3 Interference rejector .....................................................................................2-17
2.9.4 Shift TX frequency........................................................................................2-17
2.9.5 Noise limiter..................................................................................................2-18
2.9.6 Reverberation...............................................................................................2-18
2.9.7 Echo average ...............................................................................................2-18
2.9.8 Reference bearing in frequency shift............................................................2-19
2.9.9 How to suppress sidelobes ..........................................................................2-19

TABLE OF CONTENTS
vi
2.10 How to Adjust Beam Width ...................................................................................... 2-20
2.11 How to Track a School of Fish ................................................................................. 2-21
2.11.1 How to select the target lock mode.............................................................. 2-21
2.11.2 Fish mode .................................................................................................... 2-22
2.11.3 Target mark mode........................................................................................ 2-22
2.11.4 Target lock menu description....................................................................... 2-23
2.12 Presentation Mode ................................................................................................... 2-24
2.12.1 Presentation mode description..................................................................... 2-24
2.12.2 How to select a presentation mode.............................................................. 2-25
2.13 How to Detect Schools of Fish Aurally ..................................................................... 2-25
2.13.1 How to set the bearing ................................................................................. 2-25
2.13.2 How to select the audio sector..................................................................... 2-26
2.13.3 Automatic training ........................................................................................ 2-26
2.13.4 Reverberation for audio signal ..................................................................... 2-27
2.14 Fish Alarm ................................................................................................................ 2-27
2.15 How to Relocate a School of Fish ............................................................................ 2-28
2.16 How to Compare Concentration of School of Fish ................................................... 2-29
2.16.1 How to compare with the fish estimate mark ............................................... 2-29
2.16.2 How to compare with the circle cursor ......................................................... 2-30
2.17 How to Measure the Speed of a School of Fish....................................................... 2-31
2.17.1 How to measure the speed of a school of fish ............................................. 2-31
2.17.2 How to delete fish marks.............................................................................. 2-32
2.18 Event Mark, Own Ship Position Mark....................................................................... 2-33
2.18.1 How to enter an event mark......................................................................... 2-33
2.18.2 How to enter an own ship position mark ...................................................... 2-34
2.18.3 How to erase an event mark, own ship position mark.................................. 2-34
2.19 Select Mark Window ................................................................................................ 2-34
2.20 Net Course Mark ...................................................................................................... 2-35
2.21 Net Behavior ............................................................................................................ 2-36
2.22 Menu Items Descriptions.......................................................................................... 2-37
2.23 How to Interpret the Horizontal Display.................................................................... 2-40
2.23.1 Bottom and school of fish echoes ................................................................ 2-40
2.23.2 Unnecessary echoes.................................................................................... 2-42
3. VERTICAL MODE ..................................................................................................3-1
3.1 Basic Operating Procedure........................................................................................ 3-1
3.2 How the Vertical Mode Works.................................................................................... 3-2
3.2.1 Overview ........................................................................................................ 3-2
3.2.2 How to set the vertical display........................................................................ 3-2
3.3 Vertical Indications and Marks ................................................................................... 3-3
3.3.1 Typical vertical display ................................................................................... 3-3
3.3.2 Vertical bearing mark, tilt mark....................................................................... 3-4
3.3.3 Cursor position reference mark...................................................................... 3-5
3.4 Auto Train...................................................................................................................3-5
3.5 Display Range............................................................................................................ 3-6
3.6 How to Measure the Range, Bearing to a Target....................................................... 3-6
3.7 How to Eliminate Weak Echoes ................................................................................. 3-7
3.8 How to Adjust Strong and Weak Echoes ................................................................... 3-9
3.8.1 AGC ............................................................................................................... 3-9
3.8.2 Near AGC....................................................................................................... 3-9
3.8.3 2nd AGC ...................................................................................................... 3-10
3.8.4 How to shorten pulse length......................................................................... 3-10
3.9 How to Reject Sonar Interference and Noise........................................................... 3-11
3.9.1 How to identify the noise source .................................................................. 3-11
3.9.2 Interference rejector ..................................................................................... 3-12
3.9.3 Shift TX frequency........................................................................................ 3-12

TABLE OF CONTENTS
vii
3.9.4 Noise limiter..................................................................................................3-13
3.9.5 Reverberation...............................................................................................3-14
3.9.6 Echo average ...............................................................................................3-14
3.9.7 How to suppress sidelobes ..........................................................................3-14
3.10 How to Adjust Beam Width.......................................................................................3-15
3.11 Other Menu Items.....................................................................................................3-16
3.12 Usage in Bonito and Tuna Fishing ...........................................................................3-17
3.12.1 Searching .....................................................................................................3-17
3.12.2 Tracking........................................................................................................3-17
3.12.3 Approaching .................................................................................................3-18
3.12.4 Catching .......................................................................................................3-18
4. SLANT MODE........................................................................................................4-1
4.1 Basic Operating Procedure ........................................................................................4-1
4.2 Indications and Marks.................................................................................................4-2
4.2.1 Slant mode, full-screen display ......................................................................4-2
4.2.2 Slant mode, combination display....................................................................4-3
4.3 Display Range ............................................................................................................4-4
4.4 Tilt Angle.....................................................................................................................4-4
4.4.1 How to set the tilt angle ..................................................................................4-4
4.4.2 Automatic tilt...................................................................................................4-5
4.5 Auto Train...................................................................................................................4-6
4.6 How to Measure Range and Bearing to a Target .......................................................4-6
4.7 How to Eliminate Weak Echoes .................................................................................4-7
4.8 How to Adjust Strong and Weak Echoes....................................................................4-8
4.8.1 AGC................................................................................................................4-8
4.8.2 Near AGC.......................................................................................................4-9
4.8.3 2nd AGC.........................................................................................................4-9
4.8.4 How to shorten pulse length.........................................................................4-10
4.9 How to Suppress Bottom and Sea Surface Reflections in Shallow Waters .............4-11
4.10 How to Reject Sonar Interference and Noise ...........................................................4-12
4.10.1 How to identify the noise source ..................................................................4-12
4.10.2 Change TX interval.......................................................................................4-12
4.10.3 Interference rejector .....................................................................................4-13
4.10.4 Shift TX frequency........................................................................................4-13
4.10.5 Noise limiter..................................................................................................4-14
4.10.6 Reverberation...............................................................................................4-14
4.10.7 Echo average ...............................................................................................4-15
4.10.8 How to suppress sidelobes ..........................................................................4-15
4.11 How to Adjust Beam Width.......................................................................................4-15
4.12 How to Track a School of Fish..................................................................................4-16
4.12.1 How to select the target lock mode ..............................................................4-16
4.12.2 Fish mode.....................................................................................................4-17
4.12.3 Target mark mode ........................................................................................4-18
4.12.4 Target lock menu description .......................................................................4-18
4.13 How to Detect Schools of Fish Aurally .....................................................................4-19
4.13.1 How to set the bearing .................................................................................4-19
4.13.2 How to select the audio sector .....................................................................4-19
4.13.3 Reverberation for audio signal .....................................................................4-20
4.14 Fish Alarm ................................................................................................................4-20
4.15 How to Relocate a School of Fish ............................................................................4-21
4.15.1 Manual offcenter...........................................................................................4-21
4.15.2 Automatic offcenter ......................................................................................4-22
4.16 How to Compare Concentration of School of Fish ...................................................4-23
4.16.1 How to compare with the fish estimate mark................................................4-23
4.16.2 How to compare with the circle cursor .........................................................4-23

TABLE OF CONTENTS
viii
4.17 How to Measure the Speed of a School of Fish....................................................... 4-25
4.17.1 How to measure the speed of a school of fish ............................................. 4-25
4.17.2 How to delete fish marks.............................................................................. 4-26
4.18 Event Mark ............................................................................................................... 4-27
4.18.1 How to enter an event mark......................................................................... 4-27
4.18.2 How to erase an event mark ........................................................................ 4-28
4.19 Net Course Mark ...................................................................................................... 4-28
4.20 Net Data ................................................................................................................... 4-29
4.21 Menu Items Descriptions.......................................................................................... 4-30
4.22 How to Interpret the Slant Display............................................................................ 4-32
4.22.1 Bottom echoes ............................................................................................. 4-32
4.22.2 School of fish................................................................................................ 4-33
4.22.3 False echoes................................................................................................ 4-34
5. NUMERIC/GRAPHIC DATA DISPLAY..................................................................5-1
5.1 Numeric/Graphic Data Display................................................................................... 5-1
5.2 Numeric, Graphic Data Description............................................................................ 5-2
6. HOW TO CUSTOMIZE THE SONAR....................................................................6-1
6.1 User Menu.................................................................................................................. 6-1
6.1.1 How to program the user menu...................................................................... 6-1
6.1.2 How to delete items from the user menu ....................................................... 6-2
6.2 Function Keys (1/F1-0/F10) ....................................................................................... 6-2
6.2.1 How to execute a program............................................................................. 6-3
6.2.2 How to program the function keys.................................................................. 6-3
6.2.3 How to erase programs.................................................................................. 6-4
6.2.4 How to program the function keys of sub control unit .................................... 6-5
6.3 USER PROG Control ................................................................................................. 6-6
6.3.1 How to select a user program ........................................................................ 6-6
6.3.2 How to program the USER PROG control ..................................................... 6-6
6.3.3 How to program display ranges ..................................................................... 6-7
6.4 Remote Controller (option) ........................................................................................ 6-8
7. OTHERS MENU .....................................................................................................7-1
7.1 Erase Marks Menu ..................................................................................................... 7-1
7.2 Wheel Setting Menu................................................................................................... 7-2
7.3 Display Setting Menu ................................................................................................. 7-3
7.4 Alarm & Audio Menu .................................................................................................. 7-5
7.5 Register Menu............................................................................................................ 7-6
7.6 Initial Setting Menu..................................................................................................... 7-7
7.6.1 Monitor Setting menu ..................................................................................... 7-8
7.6.2 Data Box menu .............................................................................................. 7-9
7.6.3 Mark Display menu ........................................................................................ 7-9
7.6.4 Mark Size menu ........................................................................................... 7-11
7.6.5 Data Display menu....................................................................................... 7-12
7.6.6 Current Vec & Wind menu ...........................................................................7-13
7.6.7 Net SONDE Setting menu............................................................................ 7-14
7.6.8 Net Shooting Setting menu ..........................................................................7-15
7.6.9 Stabilization menu........................................................................................ 7-15
7.6.10 Initialization menu ........................................................................................ 7-16
8. RECORD/RECALL OPERATION ..........................................................................8-1
8.1 How to Specify Where to Save Still Images............................................................... 8-1
8.2 How to Save Still Image ............................................................................................. 8-2
8.3 How to Display Saved Still Images ............................................................................ 8-4
8.4 How to Save Settings................................................................................................. 8-5

TABLE OF CONTENTS
ix
8.5 How to Load Files.......................................................................................................8-6
8.5.1 How to load the setting information ................................................................8-6
8.5.2 How to replay setting information ...................................................................8-7
8.6 How to Delete Files ....................................................................................................8-8
9. MAINTENANCE.....................................................................................................9-1
9.1 Preventative Maintenance ..........................................................................................9-1
9.2 Hull Unit Maintenance ................................................................................................9-2
9.2.1 How to grease parts .......................................................................................9-3
9.2.2 How to replace the gasket..............................................................................9-4
9.2.3 How to replace the anti-corrosion zinc plates.................................................9-5
9.3 Battery on the Motherboard........................................................................................9-6
9.4 How to Replace Fuses ...............................................................................................9-6
9.5 How to Clean and Replace the Filter..........................................................................9-7
9.6 Trackball Maintenance ...............................................................................................9-7
9.7 Troubleshooting..........................................................................................................9-8
9.8 Warning Messages...................................................................................................9-10
9.9 Error Codes ..............................................................................................................9-12
9.10 Status Messages......................................................................................................9-12
9.11 Tests.........................................................................................................................9-12
9.11.1 Test menu ....................................................................................................9-12
9.11.2 Board test .....................................................................................................9-14
9.11.3 Panel test .....................................................................................................9-15
9.11.4 Test pattern ..................................................................................................9-16
9.12 How to Raise the Transducer from the Hull Unit ......................................................9-16
9.12.1 How to raise the transducer automatically ...................................................9-16
9.12.2 How to raise the transducer manually ..........................................................9-18
9.13 How to Check the Brake in the Hull Unit ..................................................................9-19
9.13.1 How to check the brake in the raise/lower control box .................................9-19
9.13.2 How to measure the gap in the motor brake ................................................9-20
APPX. 1 MENU TREE ..............................................................................................AP-1
SPECIFICATIONS ..................................................................................................... SP-1
INDEX ......................................................................................................................... IN-1

x
FOREWORD
A Word the Owner of the FSV-85 MARK-2
Congratulations on your choice of the FURUNO FSV-85 MARK-2 Color Scanning Sonar. We are
confident you will see why the FURUNO name has become synonymous with quality and reliabil-
ity.
Since 1948, FURUNO Electric Company has enjoyed an enviable reputation for quality marine
electronics 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 environ-
ment. However, no machine can perform its intended function unless operated and maintained
properly. Please carefully read and follow the recommended procedures for operation and main-
tenance.
Thank you for considering and purchasing FURUNO equipment.
Features
The FSV-85 MARK-2 is a full-circle, multibeam electronic color scanning sonar which detects and
displays schools of fish on the monitor of your choice.
The main features of the FURUNO FSV-85 MARK-2 are
CE/UKCA declaration
With regards to CE/UKCA declarations, please refer to our website (www.furuno.com) for further
information about RoHS conformity declarations.
Disclosure of Information about China RoHS
With regards to China RoHS information for our products, please refer to our website
(www.furuno.com).
• Cylindrical + sphere transducer provides 90 degrees vertical detection.
• Schools of fish can be searched from horizontal (range direction), vertical (depth direction) with ver-
tical and half-circle features.
• Function keys for direct access to desired menu item.
• Dual Display mode
• User programs for one-touch setup of equipment.
• Menu-driven operation.
• Fish histogram shows signal strength distribution of echo within estimate mark.
• Various marks and alphanumeric fishing and navigation information for intuitive operation.
• Storage and replay of picture and settings.
• Audio function for monitoring echoes along user-selected area through loudspeaker (option).
• Fish mark estimates fish speed.
• Fish estimate feature to compare the volume of two schools of fish.
• Net course mark shows probable drift of net against tidal current.
• Pitching and rolling compensation for stable picture always.

xi
SYSTEM CONFIGURATION
REMOTECONTROLLERREMOTECONTROLLER
㻯㼛㼚㼠㼞㼛㼘㻌㼁㼚㼕㼠
㻲㻿㼂㻙㻤㻡㻜㻝㻙㻹㻷㻙㻞
Remote Controller
FSV-854-MK-2
Switching Hub
External KP
AD Converter
AD-100
NMEA0183 devices (max. five units)
USB 3.0 devices (max. two units㻕
USB 2.0 devices (max. two units㻕
Speaker
SEM-21Q
Hull Unit
䠄80kHz䠅
FSV-8471-MK2
FSV-8472-MK2
FSV-8481-MK2
FSV-8482-MK2
Transceiver Unit
FSV-851C-MK2
200-220 VAC
3
I , 50/60 Hz
100/110/115/
220/230 VAC,
1
I , 50/60 Hz
*
䠖Use the optional Control Box Extension Box (FSV-2560) to extend the distance between the
raise/lower control box and the hull unit.
Raise/Lower
Control Box
FSV-8520-MK2
*
Processor Unit
FSV-8503-MK2
100-230 VAC
1ø, 50-60 Hz
AC/DC Power
Supply Unit
PR-241
12-24 VDC
Sub Control Unit
FSV-853
:
Standard supply
: Optional or local supply
Gyrocompass

SYSTEM CONFIGURATION
xii
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1-1
1. OPERATIONAL OVERVIEW
1.1 Controls Overview
1.1.1 Control Unit
No. Key/Control Description
Press to turn the power on or off.
Raises the transducer.
If the mid protrusion key is programmed to [Fixed Position]:
Lowers the transducer to half protrusion.
If the mid protrusion key is programmed to [Any Position]:
The transducer stops at desired position.
Lowers the transducer (full protrusion).
Adjusts the screen brilliance.
Note: Monitor must be a compatible monitor and must be connect-
ed via USB to the Processor Unit.
Selects user-programmed (P1 to P10) settings.
Enters the net shooting mark or own ship mark.
H/V/S
V1/S V2/S H/V/S
AUTO
TRAIN
12
3
45 6
7 8 9
10 11 12
13 14 15
16 17 18
19 20 21
22 2423 2625
28
27
Scrollwheel
Scrollwheel
Left button
Left button
Right button
Right button
Trackball
Trackball
29
30
1
2
3
4
5
BRILL
6
USER PROG
7
SHOOT

1. OPERATIONAL OVERVIEW
1-2
Enters an event mark 1 or own ship mark (horizontal mode).
Enters an event mark 2 or own ship mark (horizontal mode).
Enters a target lock mark. Shows/hides the estimate mark.
Shows/hides the estimate mark 1.
Shows/hides the estimate mark 2.
Deletes the mark highlight with the cursor.
Enters a fish mark 1.
Enters a fish mark 2.
Sets vertical cross section bearing.
• Selects the mode tab on the menu.
• Selects mode (horizontal/vertical, horizontal/half-circle, horizon-
tal/horizontal 2) to adjust sensitivity, select range, set tilt, and
user program number.
Automatic transducer train width on audio bearing mark (horizontal
mode), vertical bearing mark (vertical mode).
Sets auto tilt angle.
Selects the display mode.
Short press: Opens the menu; goes back one layer in the menu.
Long press: Closes the menu.
• Shows the range/bearing audio marker.
• Sets the audio bearing.
Off centers (moves) the own ship symbol to the cursor location.
Adjusts the gain (sensitivity).
Changes the display range.
No. Key/Control Description
8
EVENT
9
EVENT
10
TARGET
LOCK
11
ESTI-
MATE
12
ESTI-
MATE
13
DELETE
MARK
14
FISH
15
FISH
16
V1/S
17
V2
18
H/V/S
19
AUTO
TRAIN
20
AUTO
TILT
21
DISP
MODE
22
MENU /
ESC
23
R/B
AUDIO
24
OFF
CENTER
25
GAIN
26
RANGE

1. OPERATIONAL OVERVIEW
1-3
Sets the transducer tilt angle (based on sea surface).
Perform assigned program/function.
Speaker Outputs audio for key operation, alerts and raise/lower completion.
Trackball
Trackball
• Moves the cursor.
• Highlights a menu item.
Right button (short press)*1
• Opens the right-click pop-up menu.
• Cancels the selected operation.
• Goes back one layer in the menu.
• Inserts an event mark (factory default settings)*3.
Right button (long press)
• Return the own ship mark to the center of the screen.
Scrollwheel
• Spin: Changes the value for settings.
• Spin: Selects a menu item.
• Spin: Adjusts tilt, range, gain and bearing.
• Spin: Changes the selected User Program.
• Short press: Confirms the selected item.
• Long press: Opens the [Select Mark] window.
Left button (short press)*1
• Confirms your selection.
• Used with drag & drop feature*2.
• Inserts a fish mark (factory default settings)*3.
Left button (long press)
• Moves the cursor to the own ship location.
*1: This manual abbreviates the operation of the left/right buttons as follows:
“Press the left button” “Left-click”; “Press the right button” “Right-click”.
*2: The operation of holding down the left button while moving the trackball is referred to as “drag &
drop” in this manual
*3:The following marks can be assigned to the left/right buttons as a shortcut. To change the de-
fault settings and assign a mark to either button, contact your local dealer for advice.
• Event marks 1 and 2 • Fish marks 1 and 2 • Estimate marks 1 and 2
No. Key/Control Description
27
TILT
28
1
F1
0
F10
to
29
30

1. OPERATIONAL OVERVIEW
1-4
1.1.2 Sub control unit (option)
The sub control unit lets you control the sonar from a remote location.
1.1.3 Remote controller (Option)
The optional remote controller can be used for the following operations (default set-
tings shown) when you are away from the control unit.
Note 1: Do not leave the remote controller in an area subject to water splash and
spray. When the remote controller is not in use, return it to its designated hanging lo-
cation.
Note 2: Each key on the remote controller can be re-assigned with a different function
(see section 6.4).
No. Function (on control unit)
1
Same as 1/F1 to 4/F4 key.
(The program can be changed.
See section 6.2.4.)
2
Same as trackball unit on con-
trol unit.
No. Function (default)
Same function as the TILT control on
the control unit.
Same function as the RANGE control
on the control unit.
Same function as the GAIN knob on
the control unit.
21
RANGE
GAIN
TILT
䐟
䐡
䐠
1
2
3

1. OPERATIONAL OVERVIEW
1-5
1.2 Turning the Power On/Off
Turning the power on
Press the power switch ( ). The lamp to the left of the power switch lights up. A beep
sounds, and the display changes in the following sequence: FURUNO display mod-
el display board test display (see section 9.11.2). Then the lamp beside the switch
changes as below. The last-used mode is activated in approximately 140 seconds af-
ter turning the power on.
Turning the power off
1. First retract the transducer with the key. The lamp to the left of the key flash-
es while the transducer is being raised and lights steadily when it is fully raised.
Note: While raising the transducer, the ship speed must be not exceed 15 knots,
to prevent damage to the transducer and hull unit.
2. After the key lights steadily, press the power switch ( ). until the screen goes
blank.
If the power switch ( ). is pressed before retracting the transducer, the message
"Raising " appears and the transducer is retracted. However, for safety purposes,
make it a practice to retract the transducer before turning off the power.
1.3 Raising/Lowering the Transducer
After the startup tests are
complete, only the
key lamp is lit.
After the power is
turned on, all lamps
are lit.
: Raise/lower keys
CAUTIONCAUTION
Maximum speed while the transducer is
projected and being raised or lowered is as
below, to prevent damage to the transducer.
CAUTIONCAUTION
The transducer is stopped whenever the
emergency stop button on the hull is
operated or the ratchet (for manual raising)
is removed from its holder in the hull unit.
A message appears and the transducer cannot
be raised or lowered. Re-set the emergency
stop button or return the ratchet to its holder to
release the emergency stop condition.
Transducer stopped Raising / Lowering
18 knots 15 knots

1. OPERATIONAL OVERVIEW
1-6
1.3.1 Lowering the transducer
With the boat at the fishing ground and the power on, press the key to lower the
transducer. The lamp to the left of the key flashes during lowering and the message
"Lowering " appears at the bottom of the screen. When the transducer reaches the
water, the message "TX Start" appears and transmission begins automatically. After
the transducer is fully lowered the lamp the left of the key lights steadily. You can see
the position of the transducer by watching the transducer mark at the top left corner
on the screen. See section 1.3.3.
In normal use, fully lower the transducer. The time required to fully lower the transduc-
er is indicated in the following table.
If the transducer becomes entangled in the net for some reason, partially raise the
transducer with the key. The function of the key depends the menu setting (main
menu [Others] [Mid Key Setting].
[Fixed Position]: The transducer stops at the selected position. If the key is oper-
ated while the transducer is being raised or lowered, the transducer stops at the fixed
position. The fixed position can be set by clicking the transducer position marker. See
the next page.
[Any Position]: The transducer starts lowering when the key is operated. The low-
ering is stopped when the key is operated. To raise or lower the transducer from the
current position, use the or key. The key does not control lowering or raising
of the transducer.
You can see the approximate position of the transducer with the transducer position
marker (see section 1.3.3). When the transducer is stopped before it reaches full pro-
trusion, the lamp to the left of the key lights steadily.
Stroke Time (seconds)
800 mm 8
1100 mm 11