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TROUBLESHOOTING
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Many requests for repair received by Humminbird involve units that do not
actually need repair. These units are returned “no problem found.” If you
have a problem with your 450TX, use the following troubleshooting guide
before sending your unit in for repair. The 450TX contains several tools that
can aid in determining if there is a problem and how to isolate and repair
the problem in many cases.
1. Nothing happens when I turn the unit on.
Check the power cable connection at both ends. Be sure the cable is
connected correctly to a reliable power source—red lead to positive, black
lead to negative or ground. Ensure the power available at the mount is
between 10 and 20 VDC. If the unit is wired through a fuse panel, ensure
the panel is powered. Often accessory fuse panels are controlled by a
separate switch or the ignition switch. Also, often a fuse can appear to be
good when in fact is not. Check the fuse with a tester or replace it with a
fuse known to be good.
Check the power connection to the 450TX. It is possible to force the power
cable connector into the cable holder incorrectly. If the connector is
reversed, the unit will not work. Examine the contacts on the back of the
unit to ensure there is no corrosion. Finally, ensure the unit is firmly seated
on the mount. The electrical contacts are not made until the unit is fully
seated.
Ensure the metal cable retainer is properly installed in the mount. If not, the
power connection may push out when the unit is put on the mount.
2. There is no transducer detected.
The 450TX has the ability to detect and identify that a transducer is
connected. First, ensure that an appropriate transducer connector is
positioned correctly in the connector holder, and that the unit is fully seated
on the mount. The 450TX will work with the standard tri-beam transducer.
Second, inspect the transducer cable from end to end for breaks, kinks, or
cuts in the outer casing of the cable. Also ensure the transducer is fully
submerged in water. If the transducer is connected to the unit through a
switch, temporarily connect it directly to the unit and try again. If none of
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