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Humminbird LCR 120 Operation Manual

Humminbird lcr 120: user guide
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  • Page 2: Installation Preparation

    Customer Support section. INSTALLATION OVERVIEW Your Humminbird fishfinder consists of two primary components to install: the control head and the transducer. The control head contains the sonar transmit and receive circuitry, as well as the user controls and display.
  • Page 3 INSTALLATION PREPARATION INSTALLATION OVERVIEW Determining How to Mount the Transducer Your Humminbird fishfinder includes a standard transducer. This transducer can be mounted on the transom of the boat or bonded to the inside of a fiberglass hull boat. The transom installation, which is the most widely used, places the transducer on the outside of the boat hull.

  • Page 4: Alternate Mounting Methods

    ALTERNATE MOUNTING METHODS ALTERNATE TRANSDUCERS AND MOUNTING METHODS Your Humminbird fishfinder comes with everything necessary for installation and operation on most boats. However, there are several situations which may require a different type of transducer. Inboard boats, wood or metal hulls, and sail boats create unique transducer mounting needs Alternate transducers and mounting methods are detailed below.

  • Page 5: Transducer Exchange

    BEGINNING INSTALLATION Now that you have determined the transducer mounting method you can begin installation of your new Humminbird fishfinder. The installation guide included on the next few pages provides detailed step by step instructions for installation of the control head and transducer. For transom mount transducer installations you will need the mounting template included with your manual.

  • Page 6: Transom Installation

    Do not begin this transducer installation until you read the Installation Preparation in the Operation Guide. This chapter contains information critical to the correct installation of your transducer. Due to the wide variety of boat hulls, only general instructions are presented in the installation guide.
  • Page 7 If the propeller(s) is (are) forward of the transom, it may be impossible to find an area clear from turbulence, and a different mounting technique or transducer type should be considered. Step Two - Drill the Mounting Holes 1. Remove the mounting template from the front of the Operations Manual. 2.
  • Page 9 Step Four - Mount the Transducer to the Transom 1. Apply silicone sealant to the mounting holes drilled into the transom. 2. Align the transducer assembly with the drilled holes in the transom (Figure 8). 3. Use either a flat head screwdriver, a 5/16" (8mm) hex driver, or a 5/16" (8mm) socket to mount the assembly.
  • Page 10 mounting bracket. Drill this hole and install the screw after final testing and adjustments have been completed.
  • Page 11 If the cable is too short, extension cables are available to extend the transducer cable up to a total of 50' (15 m). Call Humminbird Customer Support for more information. Follow these steps to route the cable through the transom: 1.

  • Page 12: Inside The Hull Installation

    Inside the hull mounting generally produces good results in single thickness fiberglass-hulled boats. Humminbird cannot guarantee depth performance when transmitting and receiving through the hull of the boat since some signal loss occurs. The amount of loss depends on hull construction and thickness, and the installation.
  • Page 13 The transducer cannot transmit through air. The water purges any air from between the transducer and the hull and fills any voids in the coarse fiberglass surface.
  • Page 14 3. Power up the Control Head. 4. Run the boat at various speeds and water depths while observing the screen on the Control Head. If the unit functions well at low speeds but begins to skip or miss the bottom at higher speeds, the transducer needs to be moved. If depth performance is required, test the fishfinder in water at the desired depth.

  • Page 15: Control Head Installation

    CONTROL HEAD INSTALLATION Step One - Determine Where to Mount Begin the installation by determining where to mount the control head. Consider the following to determine best location: The cables for power, transducer and temp/speed accessories (if applicable) should be installed first and must reach the mounting location. Extension cables are available.
  • Page 16 fuse in the connection. If you must wire the control head directly to a battery, be sure to install an inline fuse holder...
  • Page 17 (not included) for the protection of the unit (Figure 21). Humminbird is not responsible for over voltage or over current failures. In order to minimize the potential for interference with other marine electronics a separate power source (such as a second battery) may be necessary.
  • Page 18 Optional: If the cables pass outside the mounting bracket, install the hole cover over the hole and fasten in place using the two #8 x 7/8” (22mm) wood screws (Figure 24).
  • Page 19 5. Install the control head by sliding it onto the mounting bracket until it is fully seated. To remove the unit simply depress the latch on the rear of the unit and lift (Figure 29). Your Humminbird is now ready for operation. INSTALLATION CONTROL HEAD INSTALLATION...

  • Page 20: Test The Installation

    Note: it is often necessary to make several incremental transducer adjustments before optimum high-speed performance is achieved. Important: For Transom Mount transducer installations, install the third mounting screw after the final transducer adjustments. Humminbird 3 Humminbird Lane Eufaula, Alabama 36027...
  • Page 21 5. Pull the power and sensor cables through the 5/8” hole. 6. Insert the cables into the corresponding numbered slot on the back of the LCR 120. Note that the slots are keyed so that the connectors can only plug-in one way.
  • Page 22 Increase your boat speed to ensure that you get a continuous bottom reading as the boat moves. Your LCR 120 and its sensor are designed to operate at up to 75 mph, so feel free to test them at very high speeds.
  • Page 23 You can get acquainted with these features by actual operation, or when using the simulator. POWER: Press the button once to turn the LCR 120 on, the press again to turn the unit off. When the unit is off, keeping POWER pressed for about 2 seconds starts the built-in simulator.
  • Page 24 NOTE: The last function you select remains “active”- that is, you can adjust it without having to press SELECT again. For example, if the bottom alarm was the last function used, you can readjust the alarm by pressing one of the arrow buttons. Or, if you often use Zoom, you can select it once, then switch it on and off simply by pressing ON-OFF.
  • Page 25 3. Selecting Sensitivity; Factory Setting: +0 The LCR 120 automatically adjusts to the proper amount of sensitivity for conditions (i.e. depth). You can bias the setting + or –5 levels to suit your personal taste. Increasing the sensitivity targets and the thermoclines, which might not be displayed at the +0 setting.
  • Page 26 5. Enabling Fish Alarm; Factory Setting: Off The Fish Alarm alerts you with a chirping sound whenever the LCR 120 detects fish (or another object not attached to the bottom). To activate it, select FISH ALARM and press the ON-OFF button.
  • Page 27 part of the display. By pressing either arrow button, the word “LARGE” appears on the display and the alarm will only sound when a large target is detected. A single fish symbol is shown on the bottom of the display to represent that large fish only is selected. While there is some variation in sonar characteristics of different species, typically the strength of the return is relative to the size of the fish.
  • Page 28 Bottom Lock 7. Using Bottom Lock Factory Setting: Off Bottom-Lock provides an up-close view like Zoom Range, except that in this case the zoomed view automatically moves up or down to stay on the bottom. To use this feature, select BOTTOM LOCK and press ON-OFF. The range of the display is shown when Bottom-Lock is on.
  • Page 29 Display Speeds provide more detailed information. Depth Range 9. Setting Depth Range Factory Setting: ON (Automatic) When you turn the LCR 120 on, it finds the bottom \, sets the ideal Depth Range, and automatically adjusts the Depth Range (to as much as 120’)
  • Page 30 Factory Setting: Off Although speed and temperature accessories are not available for the LCR 120, the Trip Log provides a useful timer. The timer begins when the unit is powered and can be reset and any time by pressing STOP.

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