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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 425SX. 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 con-
tacts 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 425SX 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.
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 these items identifies an
obvious problem, the transducer itself is probably the problem. Be sure to include
the transducer if returning the unit for repair.
3. There is no bottom reading visible on the display.
There are a number of possible causes for this condition. If the loss of bottom
information occurs only at high boat speeds, the transducer needs adjusting. If the
digital depth readout is working but there is no bottom visible on-screen, it is possible
the depth range has been adjusted manually to a range lower than what is needed
to display the bottom. Also, in very deep water, it may be necessary to manually
increase the sensitivity setting to maintain a graphic depiction of the bottom.
ADVANCED FEATURES
TROUBLESHOOTING