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MAINTENANCE
TROUBLESHOOTING
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 250DX. 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 connected may push out when the unit is put on the mount.
2. There is no transducer detected.
The 250DX has the ability to detect and identify that a transducer is connected.
If, at power up, a message indicates “transducer not connected,” only simulator
operation is possible. 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 250DX 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 these items identifies an
obvious problem, the transducer itself is probably the problem. Be sure to in-
clude 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.