User manual UNIDEN QT206 OPERATING GUIDE

[. . . ] Digital Depth Sounder OPERATING GUIDE Contents Unpacking . 9 Stem-type (power Boat Bronze) Transducers . 19 Features, Specifications, and availability of Optional Accessories are all subject to change without notice. 1 UNPACKING Your QT-206 Depth Sounder box should contain the following items: · Transducer with 3 lugs attached · Power Cable (attached to the gauge) · Mounting Bracket and hardware · This Operating Guide If any items are missing or damaged, please contact your dealer immediately. FEATURES n Depth Readings ­ The QT-206 is designed to give depth readings from 2. 5 feet to a maximum depth of 199 feet. Depth readings are in 1/10 foot increments from 2. 0 feet to 15 feet, and are shown as whole numbers up to 199 feet. [. . . ] The success of Inside-the-Hull installation is greatly dependent upon the purity of the hull directly below the transducer and the type of hull. Inside-the-Hull mounting should not be used on aluminum hulls, balsa core hulls, wooden hulls, or hulls where the deadrise angle is more than 15°. To reduce sound transmission losses, the adhesive used to bond the transducer to the hull should conduct sound at speeds close to that of the plastic or epoxy face of the transducer and the polyester resin of the hull. Epoxy adhesives, as opposed to silicone, are recommended. Note: When performing an Inside-the-Hull installation, you must use a special Inside-the-Hull Transducer since it contains a transducer crystal which is wider in diameter, and is designed to transmit the pulse through the hull. Do not attempt to use a Transom Mount Transducer, as the crystal is too small to ensure optimum instrument results. Selecting an Installation Location The transducer should be located where the hull laminate is dense and has no entrapped air. Generally, best operation is obtained by mounting the Inside-the-Hull Transducer on the centerline of the hull, as it allows a flat, horizontal mounting area for vertical orientation of the sonic beam. Do not choose an area above a lifting strake, as air travels underneath the hull here and could cause erroneous readings. · On sailboats, mount the transducer near the centerline and forward of the leading edge of the keel. · On power boats, mount the transducer as far aft as practical. · On I/Os, mount in a spot near the engine. · On inboards, locate the transducer forward of the prop(s), where it will not be shaded by prop shafts. 12 Use one of the following methods to determine if your chosen location is satisfactory: 1. Place the transducer in a plastic bag filled 1/2 to 3/4 full of water. Tie or tape the bag tightly around the transducer cable. Wet the selected location and place the bag against the hull, pressing the transducer face against the hull. If the hull is void free at this point, the depth sounder should now operate. Coat the face of the transducer with silicone grease or petroleum jelly. Then press with a twisting motion against the hull. If the hull is void free at this point, the depth sounder should now operate. If the interior surface of the hull at the selected spot has a rough pattern, grind it with a disc sander until smooth. Any grease or oil on the surface must be removed. [. . . ] Return unit to the factory for repair. Unit is showing "88. 8" in the display window. A logic circuit failure probably caused by a poor solder connection, lack of solder, or improper wiring. 19 Symptom Unit is not reading properly at high speeds, causing high random numbers at high RPM. Possible Reasons There are three basic types of installations: Inside-the-Hull, Through-the-Hull, and Transom Mount. Generally, this situation is attributed to the location and installation of the transducer. A great deal of air is flowing over the face of the transducer and is inhibiting the unit from receiving the correct bottom reading. Cavitation (locked on bubbles) either on the face of the transducer or on the underbelly of the boat is preventing the unit from displaying the true depth. Suggested Solutions Refer to the pages in this manual along with the drawings for your particular boat on the proper installation technique. [. . . ]