Garmin Fishfinder 340C, Owner'S Manual

Page: 26 / 56

20 Fishfinder 340C Owner’s Manual
I
NSTALLING THE
F
ISHFINDER
340C > T
ESTING THE
I
NSTALLATION
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 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 automatically
enters Simulator mode (see page 42 ).
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.
NOTE: 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 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.
4. If the signal does not improve, it might be necessary to
move the transducer to a different location.