Furuno CSH-83 User manual

COLOR SCANNING SONAR
MODEL CSH-83/84

Your Local Agent/DealerYour Local Agent/Dealer
9-52 Ashihara-cho,9-52 Ashihara-cho,
Nishinomi
y
a, Ja
p
anNishinomi
y
a, Ja
p
an
Tele
p
hone :Tele
p
hone : 0798-65-21110798-65-2111
Telefax :Telefax : 0798-65-42000798-65-4200
FIRST EDITION :FIRST EDITION : NOV.NOV. 19971997
Printed in JapanPrinted in Japan
A
ll ri
g
hts reserved.
A
ll ri
g
hts reserved. F :F : APR.APR. 05,200205,2002
PUB.No.PUB.No. OME-13090OME-13090
*00080806600**00080806600*
*00080806600**00080806600*
(( DAMIDAMI )) CSH-83/84CSH-83/84 * 0 0 0 8 0 8 0 6 6 0 0 ** 0 0 0 8 0 8 0 6 6 0 0 *
*OME13090F00**OME13090F00*
*OME13090F00**OME13090F00*
* O M E 1 3 0 9 0 F 0 0 ** O M E 1 3 0 9 0 F 0 0 *

iiiiiiiiiiiii i
SAFETY INSTRUCTIONS
WARNING
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.
Do not open the equipment.
Hazardous voltage which can
cause electrical shock exists
inside the equipment. Only
qualified personnel should
work inside the equipment.
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 equipment
damage.
Do not operate the equipment with wet
hands.
Electrical shock can result.

ii
CAUTION
Do not exceed 18 knots when operating
the equipment and do not exceed 16
knots when lowering or raising the
transducer.
The transducer may become damaged.
The zinc block attached near the
transducer must be replaced yearly.
The junction between the transducer and
main shaft may corrode, which can result
in loss of the transducer or water leakage
inside the ship.
Do not use the equipment for other than
its intended purpose.
Use of the equipment as a stepping stool,
for example, may result in personal injury
or equipment damage.
Replace the monitor when the picture
becomes difficult to see.
The average life of the monitor is about
10 years. Replace it when the picture be-
comes difficult to see, to protect vision.
A warning label is attached to the equip-
ment. Do not remove the label. If the
label becomes soiled or illegible, contact
a FURUNO agent or dealer.

iii
TABLE OF CONTENTS
FOREWORD
AWord to CSH-83/84 Owners ...............................................................................................vii
Features...................................................................................................................................vii
System Configuration ............................................................................................................viii
CONTROL DESCRIPTION
Control Layout on Display Unit and Remote Control Box ...................................................1-1
Main Panel.............................................................................................................................1-2
Sub Panel 1 ............................................................................................................................1-4
Sub Panel 2 (data setting window) ........................................................................................1-5
Remote Control Box..............................................................................................................1-8
OPERATIONAL OVERVIEW
Turning the Power On/Off.....................................................................................................2-1
Adjusting Screen Brilliance, Control Panel Backlighting .....................................................2-1
Lowering the Transducer .......................................................................................................2-1
Selecting a Display Mode......................................................................................................2-2
Selecting a Display Range.....................................................................................................2-3
Setting the Tilt Angle.............................................................................................................2-3
Adjusting the Gain.................................................................................................................2-7
Measuring Range and Bearing to a Target.............................................................................2-7
FINE TUNING THE PICTURE
Eliminating Unwanted Feeble Echoes...................................................................................3-1
Suppressing Seabed Tail ........................................................................................................3-3
Suppressing Seabed and Sea Surface Reflections in Shallow Waters ...................................3-4
Rejecting Sonar Interference and Noise ................................................................................3-4
Adjusting Beamwidth ............................................................................................................3-6
MARKS AND DATA
Marks, Data and Display Mode.............................................................................................4-1
Permanently Displayed Marks and Data ...............................................................................4-3
Erasable Marks and Data .......................................................................................................4-4
MENU OVERVIEW
USER Menu Operation..........................................................................................................5-1
USER Menu Description .......................................................................................................5-3
SYSTEM Menu Description .................................................................................................5-5
DATA SET Menu Description ...............................................................................................5-8
INIT SET/TEST Menu Description.....................................................................................5-11

iv
FUNCTION KEYS
Programming the Function Keys ...........................................................................................6-1
Replaying a Function Key .....................................................................................................6-2
Function Key Fine Tuning.....................................................................................................6-2
Saving Function Key Settings to a Memory Card .................................................................6-3
Replaying Function Key Settings from a Memory Card .......................................................6-3
ADVANCED LEVEL OPERATION
Finding Fish School Center ...................................................................................................7-1
Tracking a Fish School (target lock)......................................................................................7-2
Detecting Fish Schools Aurally .............................................................................................7-7
The Fish Alarm ......................................................................................................................7-8
Relocating Fish School for Easy Observation .......................................................................7-9
Comparing of Fish School Concentration ...........................................................................7-10
Measuring Fish School Speed .............................................................................................7-11
The Event Mark...................................................................................................................7-12
True Motion Display............................................................................................................7-14
Plotting Net Location Mark .................................................................................................7-15
Observing Net Behavior ......................................................................................................7-16
Target Slice Display.............................................................................................................7-17
PORT/STARBOARD, HORIZONTAL SLICE DISPLAYS
Port/Starboard Display ..........................................................................................................8-1
Horizontal Slice Display........................................................................................................8-2
MEMORY CARD OPERATIONS
Initializing Memory Cards.....................................................................................................9-1
Saving the Picture..................................................................................................................9-2
Transferring Echo Data from Internal Memory to Memory Card .........................................9-2
Saving Net Shooting Data .....................................................................................................9-3
Replaying Saved Data ...........................................................................................................9-4
Deleting Memory Card Contents...........................................................................................9-4
TURNING MARKS, DATA ON/OFF ..................................................................10-1
INTERPRETING THE DISPLAY
Seabed Echoes .....................................................................................................................11-1
Fish Schools.........................................................................................................................11-2
Sea Surface Reflections .......................................................................................................11-3
Wake ....................................................................................................................................11-3
False Echo by Sidelobe........................................................................................................11-4
Noise and Interference.........................................................................................................11-4

v
WARNINGS
Overvoltage Warning...........................................................................................................12-1
Unretracted Transducer Warning .........................................................................................12-1
SELF TESTS
Opening the Self Test Menu ................................................................................................13-1
Self Test Description............................................................................................................13-2
Interface Unit CS-120ASelf Test ........................................................................................13-5
INPUT DATA SELECTION
Selection of Data at Interface Unit CS-120A ......................................................................14-1
Setting Distances Between Net Sonde Transmitters............................................................14-2
MAINTENANCE
Display Unit Maintenance ...................................................................................................15-1
Hull Unit Maintenance ........................................................................................................15-2
MENU TREE..................................................................................................................A-1
SPECIFICATIONS..................................................................................................... SP-1
INDEX.............................................................................................................................. IN-1

This page is intentionally left blank.

vii
FOREWORD
A Word to CSH-83/84 Owners
Congratulations on your choice of the FURUNO CSH-83/84 Color Scanning Sonar.We are
confident you will see why the FURUNO name has become synonymous with quality and
reliability.
For over 40 years FURUNO Electric Company has enjoyed an enviable reputation for qual-
ity marine electronics equipment. This dedication to excellence is furthered by our exten-
sive 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 perform its intended function unless operated and
maintained properly. Please carefully read and 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.
Features
The FURUNO CSH-83/84 Color Scanning Sonar is a full-circle, multibeam electronic scan-
ning sonar which detects and instantaneously displays fish schools and underwater condi-
tions in 16 colors on a 15/21" non-glare, high resolution CRT screen.
The main features of the CSH-83/84 are
• Vivid 16-color display provides intuitive recognition of seabed and concentration, distri-
bution and volume of fish schools.
• Markers and indications keep the operator abreast of fishing conditions.
• Remote control box provides for armchair control of major functions.
• New gain, range or tilt setting appears in large characters whenever corresponding con-
trol is adjusted.
• Function keys automatically setup the equipment to perform specific task.
• High power MOS FET transmitter ensures reliable operation under any condition.
• Automatic screen degaussing.

viii
System Configuration
STANDARD OPTION
REMOTE CONTROL BOX
CSH-116
DISPLAY UNIT
CSH-230 (CSH-83)
CSH-2400 (CSH-84)
REMOTE DISPLAY *
CSH-106 SUB DISPLAY *
CSH-236
STEP-DOWN
TRANSFORMER
PT-400
INTERFACE UNIT
CS-120A
VI-1100A
INTERFACE UNIT
FNZ JOINT BOX
CS-170
TRANSMITTER UNIT
CSH-810
RECEIVER UNIT
CSH-820
SHIP’S MAINS
100 VAC, 1φ,
50/60 Hz
HULL UNIT
CSH-81080 (800 mm stroke)
CSH-81120 (1200 mm stroke)
110/115/220/230 VAC,
1φ, 50/60 Hz
SPEED LOG
NAVIGATOR
CURRENT INDICATOR
COLOR VIDEO SOUNDER
AD CONVERTER
ECHO SOUNDER, COLOR
VIDEO SOUNDER
NET SONDE
SHIP’S MAINS
100 VAC, 1φ,
50/60 Hz
POWER
SUPPLY UNIT
CSH-880
SHIP’S MAINS
100/110/220 VAC, 1φ,
50/60 Hz
: CSH-83
only

1-1
CONTROL DESCRIPTION
Control Layout on Display Unit and Remote
Control Box
SUB PANEL 2
POWER TRANSDUCER
OFF ON
F1 F2 F3
-+
NORM E/S HIST RECALL MEMO
TARGET
SLICE
SHOOT R/B
- +- +
RANGE GAIN
AUTO
TILT
WIDTH
TILT
SCAN DEPTH
DIM CONT BRILL AUDIO
NET
COURSE TARGET LOCK
EVENT1 EVENT2
ESTI-
MATE1 ESTI- MATE2
FISH OFF-
CENT
MAIN PANEL
SUB PANEL 1
PUSH-OPEN
VERT
SCAN
123
DISPSELECT DATA
dc
d
EVENT TGTLOCK
ESTIMATE
1
NETCOURSE
FISH
OFF-
CENT
TX
1234
FUNCTION
5
–
+
RANGE
+
–
GAIN
SHOOT MEMO
TGT
SLICE
RECALL
AUTO
AUTO
VERT
SCAN TILT
TRAIN
SCANDEPTH
REMOTE CONTROL BOX
Figure 1-1 Display unit and
remote control box

1-2
Main Panel
POWER TRANSDUCER
OFF ON
F1 F2 F3
-
+
NORM E/S HIST RECALL MEMO
TARGET
SLICE
SHOOT R/B
- +- +
RANGE GAIN
AUTO
TILT
WIDTH
TILT
SCAN DEPTH
DIM CONT BRILL AUDIO
NET
COURSE TARGET LOCK
EVENT1 EVENT2
ESTI-
MATE1 ESTI- MATE2
FISH OFF-
CENT
VERT
SCAN
Figure 1-2 Main panel
Main panel control description
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RECUDSNART sedivorpyekworranwodllamsehT.recudsnartehtrewoldnaesiaR PUehT.noisurtorplluf,yekworranwodegraleht;noisurtorp-dim worra.recudsnartehtsesiar
]+[,]-[,3F-1F .gninutenifedivorp]+[,]-[.margorpresuotgnidroccayalpsidpusteS

1-3
lortnoCnoitcnuF
TSIH,S/E,MRON )syekedoM( rednuosohcE,S/E;erutcipranoslamron,MRON:edomyalpsidtceleS .yalpsidlacirotsiH,TSIH;noitanibmoc .noitcelestnerrucwohsotsthgilyekaevobapmaL
OMEM,LLACER.erutcipdevassyalpeR:LLACER .yromemlanretnirodracyromemoterutcipsevaS:OMEM
EGNAR .yalpsidehtnosraeppadetcelesegnaR.egnaryalpsiderutcipastceleS
NIAG.ytivitisnesreviecerstsujdA
ECILSTEGRAT takrametamitseehtedisniohceehtsyalpsid,gnitlitcitamotuagnisU .selgnatlittnereffidlareves
NACSTREV.desutoN
TOOHS dnaskramednosten*,kramgnitoohstenehT.tsacsitennehwsserP ,kramgnitoohstenehT.krampihsnwoehttaraeppakramtnerruc* ehtsakcarts'pihs*ehtnoevomkramtnerrucdnaskramednosten nurecnatsid*emitdnasthgilhctiwsehtevobapmalehT.sevompihs .ffodenrutsikramgnitoohstenehtlitnuyalpsidehtnosraeppa
).rosneslanretxeseriuqeR*(
B/R tceleS.tegrataotpihsnwomorfatadgniraebdnaegnarsedivorP stcennocenilA.yekB/Rehtsserpnehtdnallabkcarthtiwtegrat .tegratotgniraebwohsotkramllabkcartdnakrampihsnwoneewteb
TLIT5-neewtebmaebgnidnuosehtfoelgnatlitehtsegnahC °06dna °.
TLITOTUA1ninwoddnapumaebgnidnuosehtstlityllacitamotuA °2ro °spets ehtevobapmalehT.yekHTDIWehtybdetceleselgnatlitehtnihtiw .nositlitcitamotuanehwsthgilyek
HTDIW.tlitcitamotuanihtdiwtlitsteS
ESRUOCTEN.tenfonoitacolskraM
KCOLTEGRAT.loohcshsifaskcarT
TNEVE htped,egnar,latnozirohdnifot,yalpsidehtnokramtneveebircsnI TOOHSsadenoitcnufebnacyektnevE.tegrataotgniraebdna .xoblortnocetomerfoyek
2,1ETAMITSE.sloohcshsifowtfoemuloverapmoC
HSIF.deepsloohcshsifserusaeM
TNEC-FFO.tegratdetcelessetacoleR
MID fossenthgirbehtdnaslenaplortnocehtfognithgilkcabehtstsujdA .syekevobaspmaleht
TNOC.tsartnocneercsstsujdA
LLIRB.ecnaillirbneercsstsujdA
OIDUA tegratasrotinomhcihw,rekaepsduolni-tliubfoemulovstsujdA .rekramgniraebehtgnolagniraeppa
LLABKCART skramretneot,kramllabkcartehtfotnemevomneercs-noswolloF .neercsehtretnec-ffodna

1-4
Sub Panel 1
RECALL MEMOHISTE/SNORM
F4 F5F3F2F1
ON
OFF
POWER TRANSDUCER
CARD
REPLAY COLOR NET
REPLAY TX
HELP
END
MENU
Figure 1-3 Sub panel 1
Sub panel 1 control description
lortnoCnoitcnuF
UNEM.unemehtsesolc/snepO
DNE dnanoitarepounemsetanimrettideyalpsidsiunemehtnehW• .erutcipranosehtotlortnocsnruter .unembussuoiverpotlortnocsnrutertiunembusaninehW•
PLEH.unemtnerrucrofnoitamrofnignitareposedivorP
.sunemnosmetitceleS
YALPERDRAC.sgnittesunemdnalortnocderots-dracsyalpeR
ROLOC.seciohcruofgnomarolocyalpsidsegnahC
YALPERTEN otyeksserp,yalperoT.atadgnitoohstenderotsyllanretnisyalpeR .niagayekehtsserpdna,yalperotmetitceles,tievobapmalthgil
XT gnirudsthgilpmalehT.derewolsirecudsnartnehw,timsnartotsserP .noissimsnart

1-5
Sub Panel 2 (data setting window)
SIGNAL
DELETE MK
TVG•TX
ES
SONR•BEAM
AUTO
ALM•AUDIO
NEAR
7
MEDIUM
8
FAR
9
CYCLE
7
PL
8
OUTPUT
9
TVG TX
+ + + + + +
– – – – – –
h
g
OPER
P-SET
(TOGGLE)
Setting change keys
Change control setting.
Item selection keys
Select item.
OPER P-SET key
Opens/closes data setting window.
ITEM
(TVG•TX selected)
CURRENT SETTINGS for item selected (TVG•TX)
This example shows settings
of TVG and TX.
Figure 1-4 Sub panel 2
Sub panel 2 control description
niaM metI metI gnitteS egnaR noitpircseD lamroN gnitteS
niaMbuS
XT•GVT
GVT
RAEN9–0 nihtiwniagreviecerstsujdA .m001 5
MUIDEM9–0 neewtebniagreviecerstsujdA .m004dnam001 5
RAF9–0 dnoyebniagreviecerstsujdA .m004 5
-SNART TIM
ELCYC9–0 lamronsi9.elcycxTsteS -orhcnys"0".)tsetsaf(gnittes .PKlanretxehtiwsezin 9
LP9–0 lamronsi9.htgneleslupxTsteS .gnittes 9
TUPTUO9–0 si9.rewoptuptuoxTsteS .rewopmumixam 9
(Continued on next page)

1-6
niaM metI metI gnitteS egnaR noitpircseD lamroN gnitteS
niaMbuS
LANGIS
LANGIS SSECORP
LN01–0.seohcedetnawnustcejeR3
CGA01–0
reviecersecuderyllacitamotuA hcusseohcegnortstsniaganiag siohcehsifostsujdA.debaessa .debaesraendeyalpsid
0
*CGA24–0 fI.seohcedebaessesserppuS sserppustonnacenolaCGA .CGA2esu,seohcedebaes 0
LANGIS SSECORP
EVRUC4–1
-neserpsusrevlevelohcestceleS rehgihehT.evrucrolocnoitat eesotsitireisaeeht,gnitteseht .neercsehtnoseohcekaew
2
RI3–0 -retnidnaesionmodnarstcejeR srednuosohcerehtoybecneref .sranosro 0
WOLGFA4–0
sihcihw,wolgretfaohcestsujdA -evomohcegnihctawroflufesu ehtgnittesehtrehgihehT.tnem .sniamerwolgretfaehtregnol
0
SE
1SE teN( )redroceR
EGNAR )GNRND( 61 .soP
ohcefoegnarhtpedsteS foegnarsteS.erutciprednuos drawnwodredrocerten .gnidnuos
m061
NIAG01–0.ytivitisneseviecerstsujdA5
TFIHS )GNRPU( –0 m0001
ohcefohtpedtratsyalpsidsteS foegnarsteS.erutciprednuos .gnidnuosdrawpuredrocerten m0
1SE teN( )redroceR
LN01–0 ybdesuac(stodeulbstcejeR .neercseritneno)retawytrid 0
ROLOC9–0 nideyalpsidseohcesetanimilE .deificepssroloc 0
RI ,NO FFO rehtoybecnerefretnisetanimilE .srednuosohcerosranos FFO
KMETELED
ETELED KRAM
-ro+ otyek .esare
kramtsedlosesaregnisserphcaE tneve,kramtnevegnoma pihsnwo,kramhsif,kram .kram
ETELED KRAM
fo5/1seteledgnisserphcaE .htgnelllarevo
KCART
HSIF.deteledsikcarThsiF
*2AGC and HOR functions cannot be used together. If one is used the other is
automatically set to “0”.
(Continued on next page)

1-7
niaM metI metI gnitteS egnaR noitpircseD lamroN gnitteS
niaMbuS
MAEB•RNOS
RANOS
RANOS2–1 ro,ranoselgnisrof"1"esoohC .ranoslaudrof"2" 1
TFIHS-F2–1 "1"esoohC.ycneuqerfxTstfihS .esulamronrof 1
MT/PU edomnoitatneserpstceleS gnidaeH,)puN(pu-htroNgnoma .)MT(noitoMeurT,)puH(pu puH
MAEB
*ROH01–0 xRfohtdiwmaeblatnozirohsteS ,rebmunehtrehgihehT.maeb .maebehtreworraneht 0
REV4–0
fohtdiwmaeblacitrevsteS lamronsi"0".maebnoissimsnart ediwrof"2"dna"1".gnittes ecafrusecuderot"3";maeb eslafsserppusot"4";rettulc .seohcemottob
0
OTUA
OTUA TLIT
FFO/NOFFO,NOelgnatlitgninnacsffo/nosnruTFFO
HTDIW :EDIW ±01-2 °,±61-4 °,±02-6 °
:WORRAN ±4-1 °,±6-2 °,±8-3 °±2°01- °
OTUA NACS
FFO/NOFFO,NO ,LBEgninnacsffo/nosnruT .rotcesoiduasnacshcihw FFO
HTDIW gninnacscitamotuasesoohC gnomahtdiw ±01 °,±02 °,±04 °
dna ±06 °.±01 °
OIDUA•MLA
HSIF MRALA
FFO/NOFFO,NO.ffo/nomralahsifsnruTFFO
LEVEL51–0
hsifhcihwtalevelohcesteS 51–0srebmuN.sdnuosmrala noitatneserp61otdnopserroc hsidder,51,eulbpeed,0:sroloc .nworb
01
ENOZ +sserP .yek ehtgnisu,enozmralasteS .yek+dnallabkcart
OIDUA
ROTCES gnomarotcesoiduasesoohC03 °06, °09, °081, °033dna °.03 °
BREVER9–0 noitarebreverfohtgnelsesoohC sevigrebmunregraL.oiduarof .noitarebreverregnol 0
RETNEC +sserP .yek ,rotcesoiduafonoitceridsteS .yek+dnallabkcartehtgnisu
*HOR and 2AGC functions cannot be used together. If one is used the other is
automatically set to “0”.

1-8
Remote Control Box
123
DISPSELECT DATA
EVENT TGTLOCK
ESTIMATE
1
NETCOURSE
FISH
OFF-
CENT
TX
1234
FUNCTION
5
–
+
RANGE
+
–
GAIN
SHOOT MEMO
TGT
SLICE
RECALL
AUTO
AUTO
VERT
SCAN
TILT
TRAIN
SCANDEPTH
Each press displays water
temperature or depth at screen
center for about five seconds.
Turns on transmitter.
Shifts trackball mark.
1-3: Same as 1-3 on main panel.
4-5: Same as - and + on main panel.
Displays the net shooting mark.
Saves picture to memory card.
Present a four (or five) angle view of
echo inside estimate mark. Light switch
to start.
Varies the tilt angle of the
sounding beam between -5°
and 60°.
Automatically tillts sounding
beam in 2°steps within tilt
angle selected by the WIDTH key.
Not used.
Not used.
Adjusts receiver sensitivity.
Selects display range.
Press to enter mark
shown on key or shift
screen center.
ises/lowers the transducer.
: Raises transducer.
: Mid protrusion
: Full protrusion
elects which display unit to
ontrol in multiple display unit
stallation.
Replays a stored picture.
➡
➡
➡
Figure 1-5 Remote control box

2-1
OPERATIONAL OVERVIEW
Turning the Power On/Off
Turning the power on
Press the ON switch on the main panel. The lamp above the
switch should light. If it doesn’t press the TX switch on sub
panel 1.
Turning the power off
Retract the transducer with the cswitch and then press the OFF
switch on the main panel.
Note:Thetransducer is automatically retracted into the tank even
if the OFF switch is pressed before retracting the transducer.
However, make it a habit to retract the transducer before turning
off the power.
Adjusting Screen Brilliance, Control Panel Backlighting
The BRILL control adjusts screen brilliance, and the DIM con-
trol adjusts control panel backlighting. These controls are on the
lower part of the main panel.
Lowering the Transducer
Press dor dswitch. The lamp above the
switch blinks during lowering of the trans-
ducerand lights when the transducer iscom-
pletely lowered. In normal use fully lower
the transducer. The transducer extends
*1200 mm below the ship’s hull, providing
stable and cavitation-free soundings. If the
transducermay become entangled in the net,
after shooting the net, for example, partially
raise the transducer with the dswitch.This
raises the transducer by 400 mm (transducer
extends *800 mm from ship’s hull).
*Hull unit with 800mm (full) and 600mm
(mid) protrusions are also available.
CAUTION
Do not exceed speed noted in the speci-
fications when operating the equipment
or lowering or raising the transducer.
The transducer may become damaged.
Do not press the cswitch during
lowering of the transducer, and do not
press the d or dswitch during raising
of the transducer.
The equipment may become damaged.

2-2
Selecting a Display Mode
TheCSH-83/84 provides three displaymodes:normal sonar pic-
ture, echo sounder(E/S) combination, and history display com-
bination. Those modes may be selected with the NORM, E/S
and HIST keys.
Table 2-1 Display mode description
Mode Description
The sonar picture appears over the entire screen.
This mode is useful for detecting and tracking fish
schools.
The default display area is 1.3 times
the range, but it can be changed to
1.6 times the range on "EXT KP/TM
DSP" in the SYSTEM menu.
Navigation information can be
displayed in the text window at
the screen bottom by turning on
"DATA DISPLAY" in the USER
menu.
Normal scanning picture appears on the upper 5/8
of the screen and the signal fed from the echo
sounder on the lower 3/8. This mode is suitable for
judging fish school concentration.
When two echo sounders are connected, each
pressing of the E/S key alternately selects echo
sounder 1 or echo sounder 2.
Note that a net recorder can be connected as echo
sounder 2; select it on the "ES" sub menu in the
INIT SET/TEST menu.
Normal scanning sonar picture appears on the upper
5/8 of the screen and the history display on the
lower 3/8. Three types of history displays are
available: Audio, Port/Starboard and Horizontal
Slice. You can select which one to display on the
USER menu.
NORMAL
E/S
HISTORY
Text window