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6. When an area is found that produces satisfactory operation, mark the location of the 
transducer. 
 
7. Remove the water and transducer and clean the marked area and the bottom of the transducer 
thoroughly with lacquer thinner. Sand the area thoroughly. 
 
8. Mix an ample amount of fiberglass resin without causing it to bubble and pour it in the area the 
transducer is to be mounted. The puddle should be larger than the bottom of the transducer. 
 
9. Coat the bottom of the transducer with resin, then put it in the center of the puddle and push 
down on the transducer while moving it around in a circular motion. This forces out any air 
bubbles that may be trapped between the bottom of the transducer and the hull of the boat. 
 
10. When the resin has cured the transducer is ready to operate. No water is now required in the 
bottom of the boat and gas and oil that is spilled inside of the boat will not degrade performance 
as it will if the transducer is placed only in water. 
 
Caution: Do not use silicone seal or any soft adhesive to bond the transducer to the hull. This will 
reduce the sensitivity of the unit. 
 
You may choose to install the transducer yourself inside the hull of your FIBERGLASS boat. If so, 
we recommend a good, two-part epoxy such as the one available in our Humminbird epoxy kit. 
 
We recommend the following steps: 
 
Any style of Humminbird transducer may be installed inside the hull. 
 
After selecting a clean, flat area, lightly sand until a smooth finish is obtained. 
 
The divider of the two-part Humminbird epoxy kit is then removed and the two parts mixed 
together thoroughly for about five minutes. By clipping one corner of the plastic envelope, a liberal 
amount of epoxy is put on the face of the transducer and spread evenly with the applicator 
provided. 
 
Any remaining epoxy is then applied to the inside hull where the transducer is to be installed and 
by using a circular motion to squeeze out all air bubbles, the transducer is placed into position. 
 
Finally, by pressing down firmly and holding for a few minutes the installation process is 
completed cleanly and efficiently. Now properly affixed, the unit should function accurately at all 
speeds. 
 
There will be cases where it is necessary to use a through-the-hull transducer. We offer a sturdy, 
durable bronze housing which is ideal. for large boats or special applications. This transducer 
comes standard with 20 foot cable. It will be necessary to bore a 13116 inch hole through the hull. 
If the hull has a curvature, it will be necessary to use a fairing block, shaped to fit the inside and 
outside contour of the hull. These can be made of hardwood, casting resin or any other suitable 
material. The fairing blocks should be cut or molded to the same dimensions as the head of the 
transducer and thick enough to compensate for the contour of the hull. See Figure 5. 
 
Caution: The hull of a wooden boat will tend to shrink when left out of the water for a prolonged 
period of time. The nut should be hand tightened only, until the hull has had a chance to swell. 
This should take about a week. The nut can then be tightened securely. 
 

Summary of Contents for CH Thirty II

Page 1: ......

Page 2: ...the back side when removing or inserting the cartridge The stylus picks up the signal from the brass bar with which the right hand element makes contact This signal is transmitted through the stylus...

Page 3: ...If this is the case we recommend you contact a dealer regarding availability Determine a suitable location where a smooth flow of water will pass across the transducer face Figure 4 The bolts connect...

Page 4: ...cer be mounted by someone familiar with the use of Fiberglass resin For this reason Techsonic Industries Inc will not be responsible for any damage due to the mounting of your transducer in this manne...

Page 5: ...l a smooth finish is obtained The divider of the two part Humminbird epoxy kit is then removed and the two parts mixed together thoroughly for about five minutes By clipping one corner of the plastic...

Page 6: ...he fuse panel HOWEVER IT IS RECOMMENDED THAT THE POWER CABLE BE WIRED DIRECTLY TO THE BATTERY Important Although your power connector is made to plug in only one way it can be forced on incorrectly N...

Page 7: ...speed To decrease the paper speed turn the paper speed control clockwise It is possible that in turning the control to its furthest clockwise position the paper will stop advancing If this happens tu...

Page 8: ...ill have no effect on the speed of the paper Your Humminbird chart paper is lined and these lines can help pinpoint your target by knowing the depth represented based upon the depth range of the unit...

Page 9: ...oard will also cause surface noise to be displayed This condition can be altered by turning down the sensitivity control or by advancing to the next depth range Some readings such as bait fish schools...

Page 10: ...ping or removing the viewing window the stylus must be moved to the back of the bottom pulley out of the way to avoid damage Photo1 With the thumb and forefinger squeeze the release mechanism The pape...

Page 11: ...core Note Be sure the paper is taped on square Roll several turns around the core be sure it is rolled straight on the core This is important Stretch the paper tight across the front of the cartridge...

Page 12: ...The cartridge will go in either way Make sure your printed edge of the chart paper is always at the bottom of the cartridge Rotate the stylus belt downward by hand to insure that the paper is install...

Page 13: ...e be removed and stored in a warm dry place This will prevent the paper from swelling possibly causing a feed problem Note Spare cartridges are available A pre loaded cartridge will save time and can...

Page 14: ...int of the stylus is smoothed off Note Periodically clean the bass stylus bar on the right of the belt occasionally sanding lightly to prevent the stylus from grooving the bar INTERFERENCE SOURCES The...

Page 15: ...l be treated as a delicate instrument 1 Keep your unit clean by wiping inside and out with a damp cloth 2 Remove it from the boat when not in use Store in a cool dry place 3 In extremely cold temperat...

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