X-20A
INSTALLATION AND OPERATION
INSTRUCTIONS
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•LOWRANCE ELECTRONICS, INC. |
LITHO IN U.S.A. |
988-0105-36 |
12000 E. SKELLY DR., TULSA, OK 74128 |
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TABLE OF CONTENTS |
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INTRODUCTION |
1 |
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INSTALLATION |
1 |
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POWER CONNECTIONS |
2 |
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KEYBOARD BASICS |
3 |
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OPERATION |
5 |
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SENSITIVITY |
5 |
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CHARTSPEED |
7 |
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RANGE |
8 |
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ZOOM |
8 |
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DIGITAL |
9 |
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FISH I.D. FEATURE |
10 |
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AUTO |
11 |
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ALARMS |
11 |
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CHARTALARM |
12 |
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FISH ALARM |
13 |
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SPEAKER |
13 |
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13 |
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LIGHT |
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MODE |
14 |
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16 |
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SIMULATOR |
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17 |
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TRANSDUCERS ANDCONE ANGLES |
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SIGNAL INTERPRETATION |
18 |
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FISHARCHES |
18 |
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WATER TEMPERATURE ANDTHERMOCLINES |
20 |
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SURVEYING A LAKE |
21 |
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BAIT FISH |
22 |
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SPECIFICATION |
22 |
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23 |
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SERVICEINFORMATION |
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TROUBLESHOOTING |
23 |
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Copyright © 1991, Lowrance Electronics, Inc.
All rights reserved.
All featuresand specifications subjectto change withoutnotice.
All screens inthis manual are simulated.
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4. Theboatmustbemovingataslowtrollingspeedtoseefisharches. Iftheboat
ismotionless, fishstayinthe cone,showing onthedisplayasstraighthorizontal lines.
ELECTRICALNOISE
Amajorcause ofsonarproblems iselectrical noise. Thisusually |
onthe |
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sonar's |
as random |
of dots or |
appears |
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lines. In severe cases, it can |
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display |
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patterns |
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completelycoverthe screen withblackdots, orcause theunitoperateerraticly, or not atall.
To eliminateor minimize the effectsofelectrical noise, firsttryto determinethe
cause, Withthe boat atrestin the water,the firstthingyoushoulddo isturn all
electrical equipmentontheboatoff. Makecertainthe engineisoff, also. Turn onthe sonarunit,thenturnASPoff. Thereshould beasteadybottomsignalon
thedisplay. Nowturnoneachpiece ofelectrical equipment ontheboat andview
theeffectonthesonar's |
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display. Forexample, turnonthe bilgepumpandview |
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thesonardisplayfor noise. If no noise is |
turnthe |
pump |
off, thenturn |
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onthe VHFradioandtransmit. |
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present, |
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thisuntilallelectrical |
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has |
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Keep doing |
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equipment |
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beenturnedon, theireffect onthe sonar |
noted, then turnedoff. |
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display |
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Ifyoufindnoise interference fromanelectrical instrument, trollingmotor,pump. or radio, try to isolatethe problem. You can usually re-routethe sonarunit's
power cable and transducercable awayfrom the wiring that is causing the interference. VHFradioantennacablesradiate noise whentransmitting,sobe certaintokeepthesonar'swiresawayfromit. You mayneedto route the sonar
unit's the isolate itfrom onthe boat. powercabledirectlyto batteryto otherwiring
If no noise displays on the sonar unit from electrical equipment, then make
certain everythingexcept the sonarunit Is turned off, then start the engine. Increase the RPMwith the gearshift in neutral. If noiseappearsonthedisplay,
ortachometer wiring. Try using resistorsparkplugs, alternatorfilters, orrouting the sonarunit's
powercableawayfromengine wiring. Again, routingthe powercabledirectlyto thebatteryhelpseliminatenoise problems. Makecertain touse thein-linefuse supplied with the unitwhen wiring the powercableto the battery.
When nonoise appearson the sonarunitafterall ofthe abovetests, thenthe
noise source Is probably cavitation. Many novices or persons with limited
experience make hastysonar installations which function perfectlyin shallow water,orwhentheboatisatrest. In nearlyallcases,thecause ofthemalfunction
will bethe locationand/orangleofthe transducer. Theface ofthetransducer
mustbe placedin alocation that hasasmooth flowofwateratallboatspeeds. Read yourtransducerowners manual forthe best mounting position.
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Weak bottom echo, digital readings erratic,or nofish signals(cont4:
2. Electrical noisefromtheboat'smotorcaninterferewlththesonar. Thiscauses
the sonartoautomatically increase its Discrimination or noiserejection feature.
Thiscancause theunittoeliminateweakersignalssuchasfishorevenstructure fromthe display.
3. The watermay bedeeperthan the sonar'sabilitytofindthebottom. ifthe sonarcan'tfindthe bottomsignal whileit'sin theautomaticmode, the digitalwill
flashcontinuously. Itmaychangethe range to limits fargreaterthanthe water you arein. Ifthis happens, placethe unit inthemanualmode, then changethe range toarealisticone,(for example, 0-100feet)andincreasethesensitivity.As
you moveIntoshallowerwater, a bottomsignalshould appear.
4. Checkthe batteryvoltage. ifthe voltagedrops, the unit'stransmitterpower alsodrops, reducing itsabilityto findthe bottomortargets.
Bottom echo disappears at highspeeds or erraticdIgitalreading orweak bottom echo whileboat Is moving
1. Thetransducermaybe in turbulentwater. It must be mounted in a smooth
flow ofwaterin orderforthesonartoworkatall boat speeds.Airbubblesinthe waterdisruptthe sonarsignals, interfering with its abilitytofind the bottomor othertargets. Thetechnical termfor this is 'Cavitation'.
2. Electrical noisefromtheboat'smotorcanInterfere withthesonar. Thiscauses
thesonartoautomatically increase itsDiscrimination or noise rejectionfeature. Thiscancause the unittoeliminate weakersignalssuchasfish orevenstructure
sonarunit's |
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fromthe display. Tryusingresistorsparkplugs or routing the |
power |
andtransducercables awayfromother electrical wiringonthe boat.
No fisharcheswhenthe Fish IDfeature Isoff:
1.Makecertain transducerispointingstraightdown. This isthe mostcommon problemifapartialarchisdisplayed. Seethe Fish Archsectionin this manual formoreinformation.
2.The sensitivitymaynot behighenough. in orderforthe unit todisplayafish arch,it hastobeableto receive the fish'sechofromthe time itentersthe cone
untilit leaves. ifthe sensitivity isnot highenough,the unitdisplaysthe fish only whenit is in the centerofthe cone.
3. Usethe Zoom feature, It ismucheasierto displayfisharcheswhen zoomed in on asmallrange ofwaterthan alargeone. Forexample, youwill havemuch betterluckseeingfisharches witha30to60foot range thana0to60foot range.
Thisenlarges the targets,allowingthe displaytoshow muchmore detail.
INTRODUCTION
Welcome to the worldof sportfishing sonar. Your Lowrance X-20A is
a high quality sonar designed for both professional and novice users.
This unit has an automatic featurethat finds and displaysthe bottom
depth,fish, andstructure. Asyou becomefamiliarwith yourX-20A,you can "fine tune" the unit to the surroundingconditionsto get the most
from your sonar.
Althoughthe X-20A has manyfeatures and functions,the simple key-
board and operation modes makes it easy to use and understand.
Readthis manual andtake itwith you whenyou usethis unit. it makes reference should you need it. The more you know whenyou get
to thewater,the moreyour X-20Acan do foryou!
INSTALLATION
Mounting
install the unit in any convenient location,provided there is clearance when tiltedforthe bestviewingangie. Holes in the bracket baseallow woodscreworthroughbolt mounting. Place apieceof plywood onthe back of thin panelsto securethe mounting hardware. Makecertain there is enough room behind the unit to power and
transducercables.
You can routethepowerandtransducercablesthroughaone inch hole in the mounting surface. Firstpassthetransducerconnectorand cable upthroughthe hole. Thenpushthe powercablewiredownthrough it. After routing the cables, fill the hole with silicone rubber adhesive
Offsetthebracket to coverthe hole. Routethe cables through theslotinthe rearofthebracket. Therearetwonotches inthe bracket that can be punched out for more cables,if necessary.
NOTCIII
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