Insignia 105SX - Manual (Page 26)

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Check the power connection to the 105SX. 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 105SX has the ability to detect and identify that a transducer is
connected. If, at power up, a message indicates “transducer not connect-
ed,” 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 105SX will work with the
standard single 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 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.
If you are using a transducer switch to connect two transducers to the
105SX, ensure the switch is in the correct position to connect a
transducer that is in water. (If a trolling motor transducer is selected and
the trolling motor is out of water, no sonar information appears.)
If none of the above solve the problem, inspect the transducer cable from
end to end for breaks, kinks, or cuts in the outer casing of the cable. If
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