Humminbird HDR 400G Operation Manual page 16

INSTALLING THE CABLES
Your unit has two connectors, a transducer connector and a power connector. The
transducer connector attaches to the transducer cable.
The power connector attaches to the power cable. The power cable has a red lead and a
black lead. Connect this cable to a 12-volt DC Power Source (battery). Attach the red to the
positive (+) post and the black lead to the negative (-) post. Install a 1 amp fuse between the red
cable and positive post of your 12-volt battery. If a fuse panel is available, we recommend wiring
the power cable into the fuse panel. 'Note: The Humminbird Digital must be fused separately from
any other accessory.
If you are installing the gimbal mounted unit, a 9/,6" hole should be drilled in the dash to
pull the transducer connector up and to feed the power leads down. A hole cover has been
provided which will dress and hold the wires. Install the hole cover after determining the
necessary length from the hole.
TESTING YOUR UNIT AND TRANSDUCER INSTALLATION
After installing the unit, transducer, and cables, you are ready to test the installation. You
should put your boat in the water to test the unit because the transducer cannot transmit and
receive properly through air.
INITIAL UNIT TESTING
With your boat in the water at idle or at a very slow speed. Turn your unit on by pushing
the "on" button. The unit's computer will automatically locate the bottom and show the depth on
the display.
TROUBLE SHOOTING: If nothing happens when the "on" button is pushed, check your
electrical connections and fuse. Also check that the red wire on the power cable is connected to
the positive battery terminal and that the black wire is connected to the negative battery terminal.
If these wires are reversed it will not damage the unit. It is normal if when reversing the boat, the
bottom return is lost, since air from the prop is being forced under the transducer. Remember the
transducer cannot transmit through air.
TROUBLE SHOOTING: If the display comes on when the "on" button is pushed but the
bottom depth is not displayed, check that the transducer connector is securely locked to the rear
of the unit. Also insure that the transducer is completely submerged. A transducer cannot work
properly in air or through air bubbles in the water.
TROUBLE SHOOTING: In 1 or 2 feet of water the bottom depth may blank or go off. This
is normal in very shallow water. This is also normal in deeper water under high clutter conditions.
TROUBLE SHOOTING: If the display is not showing a steady bottom reading (if it is
blanking or going on and off), begin to systematically turn
off other equipment on the boat. In this way you can isolate which piece of equipment is
generating the interference. After isolating the problem, check that the equipment is properly
grounded. Try re-routing the power and transducer cables away from the source of the
interference. You may have to physically separate the two pieces of equipment.
TROUBLE SHOOTING: If the unit comes on without pressing the "on" button or if you
cannot turn it off by pressing the "on" button, carefully inspect the transducer cable. This condition
will be seen if the outer jacket of the cable has been cut and is touching any metal piece of the
boat.
TRANSDUCER INSTALLATION TEST
After verifying that your unit is working properly, you are ready to increase boat speed to
test the transducer installation. As you increase boat speed the unit should give a continuous
bottom return. With a proper transducer installation your Humminbird Digital will perform at
speeds up to 75 miles per hour.
TROUBLE SHOOTING: If at high speeds the bottom return is not continuous or it blanks
out, then the transducer installation or location is such that air is going under the transducer face.