CANNON 1491072 Digi Troll IV Transducer Instruction Manual
- June 4, 2024
- CANNON
Table of Contents
1491072 Digi Troll IV Transducer
**Instruction Manual
**
Digi-Troll IV 120KHZ Transducer
1491072
CAUTION: READ THIS MANUAL CAREFULLY BEFORE OPERATING YOUR NEW CANNON®
ACCESSORY. RETAIN FOR FUTURE REFERENCE.
NOTE: Do not return your CANNON® accessory to your retailer. Your
retailer is not authorized to repair or replace this unit. You may obtain
service by
- calling CANNON® at 1-800-227-6433;
- returning your accessory to the Factory Service Center; 121 Power Drive, Mankato, MN 56001 Please include proof of purchase, serial number, and purchase date for warranty service with any of the above options.
Mounting Instructions
The Cannon® Digi-Troll IV 120KHZ Transducer enables the bottom following
option to dect and follows bottom contour changes. The accuracy of your Digi-
Troll IV is largely dependent on correctly installing the transducer on your
boat. If not installed properly, your Digi-Toll IV unit will not give you the
service of which it is capable.
The Digi-Troll IV functions by sending a series of sonar pulses from the
transducer. Each pulse travels through the water until it hits the bottom
terrain. The pulse then “bounces” back to the transducer where it is converted
to an electrical signal and used to adjust the depth of the downrigger weight
accordingly.
The face of the transducer must be in intimate contact with undisturbed water.
Sonar signals cannot travel either through open air or through turbulent
water. Air and/or turbulence will “blind” the sonar, causing it to lose bottom
contact or otherwise cause poor operation of the bottom following feature. To
ensure that the transducer is mounted properly, follow the suggestions in this
manual.
Transom Mounts
The most common place to mount your transducer is on the transom. It may be
helpful to drive your boat at a variety of speeds and observe where the water
flows most smoothly off the transom. Smooth, clean water often flows from the
center of the transom at the base of a step. The transducer is designed to
mount slightly below the bottom of the boat. The metal brackets have a slot
that allows you to make vertical adjustments to the mounting.
Performance Considerations
Various transducer mount methods depend on your
boat’s performance. If the bulk of your trolling is at 7 MPH or less, mounting
the transducer in almost any loaction along the bottom of the boat is
acceptable. It is not recommended that you use the bottom following option at
speeds greater than 10 MPH. If you would like to use the bottom monitoring
mode on your Digi-Troll IV at higher speeds, a mounting position low and
toward the center of the transom is a must. Mounting suggestions for low and
high-speed performance are given below.
Regardless of the operating speed, you prefer, always remember the face of the
transducer should be mounted parallel with the water if at all possible.
In most cases, we recommend the transducer be centrally located with the nose
between 1/8″ and 1/4″ below the hull. If the boat has only a slightly “v”ed
hull (15 degrees or less), the transducer should be mounted parallel with the
water. (See Figure 1, Option 2)
The deeper the transducer’s pointed end is below the hull and the more
centrally located the transducer is, the better your unit will operate.
NOTE: If you have an aluminum boat avoid placing the transducer behind a
row of rivets.
NOTE: Water turbulence is minimized when the transducer face is mounted
below the bottom of your craft.
FIGURE 1 Option 1 Mounting – High-Speed Operation
In high-speed operation, drag and rooster tails can result from mounting
the transducer too low. Also, water flowing to high-performance engines
becomes more turbulent. Mounting the transducer as in Option 1 (See Figure 1)
will minimize the turbulence and give better high-speed results.
CAUTION: Never drag a weight at high speeds. Use the monitor mode on the
Digi-Troll IV if you wish.
Mounting Height
Lower
- Better for aluminum boats with rivets in the hull
- Better for high speeds
Option 2 Mounting – Low-Speed Operation
In low-speed operation, the transducer can be positioned to show what is
directly under the boat. However, it may increase drag and possibly throw a
rooster tail when you plane the boat. If you choose Option 2, make sure the
angle of the boat’s hull stays within the lines marked on the template. (See
Figure 2) It may be necessary to angle the transducer somewhat to stay within
the dotted lines.
Higher
- Less boat drag and no rooster tails
- Less chance of transducer damage
How to Mount the Transducer
To mount the transducer:
- Refer to Figure 3.
- Use the template as a guide and drill four 9/64″” holes in the transom, 3/4″ deep
- Loosely attach the two metal brackets with four #10 self-tapping screws provided.
- Attach the transducer to the brackets with screws, washers, & nuts provided.
- Adjust the brackets until the desired height is achieved and snug up the screws.
- Determine the angle you want on the transducer face and tighten the bolts.
- Finally, remove the screws in the hull one at a time and fill the holes with silicone before retightening. Each time one of the self-tapping screws is removed, the holes must be resealed.
Tools Needed:
- Phillips Head Screw Driver
- 9/32″ Wrench
- Drill with a 9/64″ bit
- Silicone sealant
WARNING: Failure to reseal the holes when you remove the screws from your
hull can seriously damage your boat.
If You Have Problems
If the desired operational characteristics from your downrigger, try these
suggestions:
- Loosen the 4 screws holding the transducer to the brackets and rotate the back of the transducer slightly down to a maximum of 5 degrees. Retighten the bolts and check again on the water.
- If step one doesn’t produce results, loosen the 4 screws in the transom and lower the transducer to 1/4″ below the hull. Retighten the screws and try again. If needed, the transducer can be lowered until the top is flush with the bottom of the hull.
- If good operation still has not been achieved, experiment by increasing and decreasing the angle of the transducer with respect to the bottom of the boat and by changing the distance the transducer is positioned below the bottom of the boat. Changes as small as one degree or 1/16″ can produce the desired results
MOUNTING TEMPLATE
CANNON® LIMITED WARRANTY
Johnson Outdoors Inc. warrants to the original purchaser that the accompanying
product (see exclusions below) is free from defects in material or workmanship
for a period of one (1) year from the date of purchase. Within the warranty
period, Johnson Outdoors Inc. will, at its option, either repair or replace
the same without charge (but no cash refunds will be made). The unit must be
returned, prepaid, and with proof of the date of purchase to the following:
Johnson Outdoors, Inc Cannon Division, 121 Power Drive, Mankato, MN 56001 This
limited warranty may be enforced only by the original purchaser; all
subsequent purchasers acquire the product “as is” without any benefit of this
limited warranty. Repair or replacement of the product as set forth in this
limited warranty shall be the original purchaser’s sole and exclusive remedy
and Johnson Outdoors Inc.’s sole and exclusive liability for breach of this
warranty.
EXCLUSIONS
This warranty does not apply in the following circumstances:
- When the product has been connected, installed, combined, altered, adjusted, serviced, repaired, or handled in a manner other than according to the instructions furnished with the product
- When any defect, problem, loss, or damage has resulted from any accident, misuse, negligence, carelessness, or abnormal use, or from any failure to provide reasonable and necessary maintenance in accordance with the instructions of the owner’s manual
LIMITATION AND EXCLUSION OF IMPLIED WARRANTIES AND CERTAIN DAMAGES
THERE ARE NO EXPRESS WARRANTIES OTHER THAN THESE LIMITED WARRANTIES. JOHNSON
OUTDOORS INC. DISCLAIMS LIABILITY FOR INCIDENTAL AND CONSEQUENTIAL DAMAGES,
AND IN NO EVENT SHALL ANY IMPLIED WARRANTIES, INCLUDING ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, EXTEND BEYOND ONE YEAR
FROM THE DATE OF PURCHASE. THIS WRITING CONSTITUTES THE ENTIRE AGREEMENT OF
THE PARTIES WITH RESPECT TO THE SUBJECT MATTER HEREOF; NO WAIVER OR AMENDMENT
SHALL BE VALID UNLESS IN WRITING SIGNED BY JOHNSON OUTDOORS INC.
Some states do not allow limitations on how long an implied warranty lasts or
the exclusion or limitation of consequential damages, so the above limitation
or exclusion may not apply to you. This warranty gives you specific legal
rights, and you may also have other rights that vary from state to state.
ENVIRONMENTAL COMPLIANCE STATEMENT:
It is the intention of Johnson Outdoors Inc. to be a responsible corporate
citizen, operating in compliance with known and applicable environmental
regulations, and a good neighbor in the communities where we make or sell our
products.
WEEE Directive:
EU Directive 2002/96/EC “Waste of Electrical and Electronic Equipment
Directive (WEEE)” impacts most distributors, sellers, and manufacturers of
consumer electronics in the European Union. The WEEE Directive requires the
producer of consumer electronics to take responsibility for the management of
waste from their products to achieve environmentally responsible disposal
during the product life cycle.
WEEE compliance may not be required in your location for electrical &
electronic equipment (EEE), nor may it be required for EEE designed and
intended as a fixed or temporary installation in transportation vehicles such
as automobiles, aircraft, and boats. In some European Union member states,
these vehicles are considered outside of the scope of the Directive, and EEE
for those applications can be considered excluded from the WEEE Directive
requirement.
This symbol (WEEE wheelie bin) on a product indicates the product must not be
disposed of with other household refuse. It must be disposed of and collected
for recycling and recovery of waste EEE. Johnson Outdoors Inc. will mark all
EEE products in accordance with the WEEE Directive. It is our goal to comply
with the collection, treatment, recovery, and environmentally sound disposal
of those products; however, these requirements do vary within European Union
member states. For more information about where you should dispose of your
waste equipment for recycling and recovery and/or your European Union member
state requirements, please contact your dealer or distributor from which your
product was purchased.
To download product manuals or purchase Cannon products from an authorized
dealer, please visit our web page at
www.cannondownriggers.com
Johnson Outdoors, Inc. / Cannon Division
121 Power Drive, Mankato, MN 56001
1-800-227-6433
© 2008 Johnson Outdoors, Inc.
All rights reserved.
WARNING: This product contains chemical(s) known to the state of
California to cause cancer and/or reproductive toxicity.
Form No. 3397115 Rev E ECN 32278 5/10