Testing The Installation - Garmin FishFinder 340C Owner's Manual

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
Fishfinder beeps. It should turn on. If the Fishfinder fails to
turn on, verify that the wiring adapter is properly connected
in the back of the Fishfinder, the Red and Black wires are
connected to the correct polarity, and that the 3-Amp fuse is
installed and not blown. If the Fishfinder is connected to a
power supply that exceeds 35 volts DC, 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
automatically enters Simulator mode (see page 22).
2. When the Fishfinder 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.
Fishfinder 340C Owner's Manual
I F
NSTALLING THE ISHFINDER
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 Fishfinder turns on, it should immediately start showing the
bottom. Verify that the Fishfinder is not in Simulator mode. If the
Fishfinder is in Simulator mode, make sure that the transducer is
connected properly to the Fishfinder. 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.
340C > T I
ESTING THE NSTALLATION
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