Garmin Fishfinder 340C Owner's Manual

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0 Fishfinder 340C Owner’s ManualInstAllIng the fIshfInder 340c > testIng the InstAllAtIonTesting the InstallationWhile it is possible to perform some checks with the boat trailered,the boat should be in the water to properly test the sonar portion ofthe installation.To test the installation:1. Press and hold the Power/Backlight key until the Fishfinderbeeps. It should turn on. If the Fishfinder fails to turn on, verifythat the wiring adapter is properly connected in the back ofthe Fishfinder, the Red and Black wires are connected to thecorrect polarity, and that the 3-Amp fuse is installed and notblown. If the Fishfinder is connected to a power supply thatexceeds safe operating levels, a “Battery voltage is too high”warning appears and the Fishfinder turns off in 10 seconds.If the Fishfinder does not detect a transducer, it automaticallyenters Simulator mode (see page 42).2. When the Fishfinder detects a transducer at initial start up,a Select Transducer Type window appears. Press ENTERto select the transducer type.3. Use the ROCKER to select your transducer type, and pressENTER.4. Press QUIT to return to the Sonar Page.NOTE: When adjusting the depth of the transducer, make theadjustments in small increments. Placing the transducer toodeep can adversely affect the boat’s performance and put thetransducer 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 notpossible to get a depth or distance reading when out of the water.As the Fishfinder turns on, it should immediately start showing thebottom. Verify that the Fishfinder is not in Simulator mode. If theFishfinder is in Simulator mode, make sure that the transducer isconnected properly to the Fishfinder. When you place your boat inthe water CHECK FOR LEAKS around any screw holes that havebeen added below the water line. DO NOT leave your boat in thewater 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 sonarappears to be working properly gradually increase theboat’s speed observing the sonar’s operation. If the sonarsignal suddenly is lost or the bottom return is severelydegraded, 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 thesignal improves.3. If the signal strength improves while turning, adjust thetransducer so that it extends another 1/8" below thetransom of the boat. It might take several adjustments toeliminate the degradation.4. If the signal does not improve, it might be necessary tomove the transducer to a different location.