Garmin 340c Manual

A SERVICE OF

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0 Fishnder 340C Owner’s Manual

InstAllIng the fIshfInder 340c > testIng the InstAllAtIon

Testing the Installation

While it is possible to perform some checks with the boat trailered,

the boat should be in the water to properly test the sonar portion of

the installation.

To test the installation:

1.

PressandholdthePower/BacklightkeyuntiltheFishnder

beeps.Itshouldturnon.IftheFishnderfailstoturnon,verify

thatthewiringadapterisproperlyconnectedinthebackof

theFishnder,theRedandBlackwiresareconnectedtothe

correctpolarity,andthatthe3-Ampfuseisinstalledandnot

blown.IftheFishnderisconnectedtoapowersupplythat

exceedssafeoperatinglevels,a“Batteryvoltageistoohigh”

warningappearsandtheFishnderturnsoffin10seconds.

IftheFishnderdoesnotdetectatransducer,itautomatically

entersSimulatormode(seepage 42).

2. WhentheFishnderdetectsatransduceratinitialstart up,

aSelectTransducerTypewindowappears.PressENTER

toselectthetransducertype.

3. Use the ROCKER toselectyourtransducertype,andpress

ENTER.

4. Press QUIT to return to the Sonar Page.

When adjusting the depth of the transducer, make the

adjustments in small increments. Placing the transducer too

deep can adversely affect the boat’s performance and put the

transducer at greater risk of striking underwater objects.

Because water is necessary to carry the sounder’s sonar signal,

the transducer must be in the water to work properly. It is not

possible to get a depth or distance reading when out of the water.

As the Fishnder turns on, it should immediately start showing the

bottom. Verify that the Fishnder is not in Simulator mode. If the

Fishnder is in Simulator mode, make sure that the transducer is

connected properly to the Fishnder. When you place your boat in

the water CHECK FOR LEAKS around any screw holes that have

been added below the water line. DO NOT leave your boat in the

water for an extended period of time without checking for leaks.

To test the transom mount installation:

1. Begintestingtheinstallationataslowspeed.Ifthesonar

appearstobeworkingproperlygraduallyincreasethe

boat’sspeedobservingthesonar’soperation.Ifthesonar

signalsuddenlyislostorthebottomreturnisseverely

degraded,notethespeedatwhichthisoccurs.

2. Returntheboattothespeedatwhichthesignalwaslost.

Makemoderateturnsinbothdirections,andseeifthe

signal improves.

3. Ifthesignalstrengthimproveswhileturning,adjustthe

transducersothatitextendsanother1/8"belowthe

transomoftheboat.Itmighttakeseveraladjustmentsto

eliminatethedegradation.

4. Ifthesignaldoesnotimprove,itmightbenecessaryto

movethetransducertoadifferentlocation.