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Fishnder 90/140 Owner’s Manual 13
Installing Your Fishnder
Testing the Transom Mount
Installation
Perform this test after you install the Fishnder. Because
you need water to carry the sonar signal, the Fishnder
does not function properly with the transducer out of the
water. When you place your boat in the water, CHECK FOR
LEAKS around the screw holes that are below the water
line. DO NOT leave your boat in the water for an extended
period of time without checking for leaks.
To test the transom mount installation:
1. Begin testing the installation at a slow speed. If the
sonar appears to be working properly gradually increase
the boat’s speed observing the sonar’s operation. If
the sonar signal suddenly is lost or the bottom return is
severely degraded, note the speed at which this occurs.
2. Return the boat to the speed at which the signal was
lost. Make moderate turns in both directions, and see if
the signal improves.
3. If the signal strength improves while turning, adjust the
transducer so that it extends another 1/8" below the
transom of the boat. It might take several adjustments to
eliminate the degradation.
4. If the signal does not improve, it might be necessary to
move the transducer to a different location.
190-00582-10_0A.indd 13 12/2/2011 3:08:58 PM
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