Humminbird XNT 9 DB 74 T Installation Manual page 6

TRANSOM TRANSDUCER Installation Guide
6
| Test and Finish the Installation
Once you have installed the control head, the transducer, and have routed all the cables, you must
perform a final test before locking the transducer in place.
Testing should be performed with the boat in water deeper than 2 feet. The transducer should be
fully submerged because the sonar signal cannot pass through air.
WARNING! The transducer must be fully submerged in water during operation because the sonar
signal cannot pass through air. Air pinging can damage the transducer.
Test the Transducer Installation on the Control Head
1. Press the POWER key to turn on the control head.
If the transducer is detected, the control head will start Normal mode.
2. Select a Sonar View to display on-screen.
HELIX®: Press and hold the VIEW key. Select Sonar > Sonar View.
SOLIX®: Press the HOME key. Select a Sonar View.
Other: See your control head operations manual.
3. If the bottom is visible on-screen with a digital readout for Depth, the unit is working properly.
Gradually increase the boat speed to test high-speed performance. If the unit functions well
at low speeds, but begins to skip or miss the bottom at higher speeds, the transducer requires
adjustment.
NOTE: Down Imaging provides the maximum detail at slower boat speeds, however high
speed performance is available in the Down Imaging and traditional sonar views.
4. If you have the correct angle set on the transducer, yet lose a bottom reading at high speed,
adjust the height and the running angle in small increments to give you the ideal transducer
position for your boat. First, adjust the height in small increments.
5. If you are still not getting good high speed readings, you may need to disassemble the
transducer mounting assembly and re-position the ratchets.
If you do change the transducer position, re-trace the position of the mounting bracket
before proceeding.
NOTE: It is often necessary to make several incremental transducer adjustments before
optimum high speed performance is achieved. Due to the wide variety of boat hulls, however,
it is not always possible to obtain high speed depth readings.
Finalize the Transducer Installation
Once you have reached a consistently good sonar signal at the desired speeds, you are ready to lock
down the transducer settings.
6. Force the pivot to the Up position to gain access to the mounting screws, then re-align the
mounting bracket against the transom of the boat to match the traced silhouette. Check the
bracket position with the level again to make sure it is still level, then mark the third mounting
hole using a pencil or marker.
7. Unscrew and remove the mounting screws and the transducer assembly and set aside.
8. Drill the third mounting hole, using a 5/32" (4 mm) drill bit.
9. Use a marine-grade silicone sealant to fill all three drilled mounting holes, especially if the
holes penetrated the transom wall.
10. Re-position the transducer assembly against the transom of the boat, then hand-install all
three screws. Make sure that the transducer location and the pivot angle have not changed,
then fully tighten all three mounting screws. Hand-tighten only!
11. Snap the pivot back down. If you have performed the preceding procedures correctly, the
transducer should be level and at the right height for optimal operation.
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