Humminbird XNT 9 20 Installation Manual page 6

TRANSDUCER Installation Guide
3. If the bottom is visible on-screen with a digital readout for Depth, the unit is working properly.
If 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.
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. Remove the transducer from the bracket (after noting where the ratchets are assembled),
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 bracket and set aside.
8. Drill the third mounting hole, using a 5/32" (4 mm) drill bit.
NOTE FOR FIBERGLASS HULLS: It is best to use progressively larger drill bits to reduce the chance
of chipping or flaking the outer coating.
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 bracket against the transom of the boat, then hand-install
all three screws. Make sure that the transducer location has not changed, then fully tighten
all three mounting screws (see illustration Fully Tightening All Three Mounting Screws).
Hand-tighten only!
11. Re-install the transducer to the mounting bracket, making sure to assemble the ratchets in
the same location they had before.
If you have performed the preceding procedures correctly, the transducer should be level and
at the right height for optimal operation.
Setting Up an Accessory Transducer on the Control Head
The control head will automatically select the transducer that was included with your control head.
If a compatible accessory transducer is connected, you will need to set the transducer type on the
control head. When you select the transducer type, the related views and menus will be added to
the system.
Δ For additional configuration information, download the control head operations manual from
our Web site at humminbird.com.
6
532310-3_A
Fully Tightening All Three
Mounting Screws
(Hand-tighten only!)