Teleflex TFX320 Operation Manual page 24

MAINTENANCE AND WARRANTY
MAINTENANCE
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 Gain setting to maintain a graphic depiction of the bottom.
If you are using a transducer switch to connect two transducers to the 320,
ensure the switch is in the correct position to connect to 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 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 may be the problem. Be sure to include the
transducer if returning the unit for repair.
4. When in very shallow water, I get gaps in the bottom reading and
inconsistent digital depth indication.
The 320 will work reliably in water 2' (.6m) or deeper. The depth is measured
from the transducer, not necessarily from the surface.
5. The unit comes on before I press the G Knob to turn it on, and
AIN
won't turn off.
Check the transducer cable—if the outer jacket of the cable has been cut and
the cable is in contact with bare metal, you need to repair the cut with electrical
tape. If there is no problem with the cable, disconnect the transducer from the
unit and see if the problem is corrected, to confirm the source of the problem.
6. I get gaps in the reading at high speeds.
Your transducer needs adjusting. If the transducer is transom-mounted, there
are two adjustments available to you—height, and running angle. Make small
adjustments and run the boat at high speeds to determine the effect. It may
take several tries to optimize high speed operation. This can also be a result of
air or turbulence in the transducer location caused by rivets, ribs, etc.
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