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Humminbird LCR120 - page 1
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Humminbird LCR120 - page 2
INSTALLATION PREPARATION PARTS SUPPLIED PARTS SUPPLIED Before installing your new Humminbird fishsinder, please ensure the following parts are included in the box: • Fishfinder • Transducer with 20’ (6m) of cable and mounting hardware kit • Mounting system an d mounting hardware kit • 6’ (2m) power cable • Publications kit It any of t ...
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Humminbird LCR120 - page 3
INSTALLATION PREPARATION INSTALLATION OVERVIEW Determining How to Mount the Transducer Your Humminb ird 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 ...
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Humminbird LCR120 - page 4
INSTALLATION PREPARATION ALTERNATE M OUNTING 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. In board boats, wood or metal hulls, and sail boats create un ...
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Humminbird LCR120 - page 5
INSTALLATION PREPARATION TRANSDUCER EXCHANGE TRANSDUCER EXCHANGE Other transducers are available as replacements for the standard transducer. You may exchange your new and unassembled transducer for another type by returning i t to the address listed in Customer Support. Some transducers may have additional cost. Refer to the Accessory catalog or c ...
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Humminbird LCR120 - page 6
INSTALLAT ION 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 b oat hulls, only general instructions are presented in the installation guide. Each bo ...
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Humminbird LCR120 - page 7
INSTALLATION TRANSOM INSTALLATION • 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. Hold the te ...
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Humminbird LCR120 - page 8
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Humminbird LCR120 - page 9
INSTALLATION TRANSOM INSTALLATION 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. U se either a flat head screwdriver, a 5/16" (8mm) hex driver, or a 5/16" (8mm) socket to mount th ...
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Humminbird LCR120 - page 10
mounting bracket. Drill this hole and install the screw after final testing and adjustments have been completed. ...
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Humminbird LCR120 - page 11
INSTALLATION TRANSOM INSTALLATION Step Six - Route the Cable There are several ways to route the transducer c able to the to the area where the control head will be installed. The most common procedure routes the cable through the transom into the boat. Inside the boat there is often a channel or conduit used for other wiring that the cable can be ...
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Humminbird LCR120 - page 12
INSTALLATION INSIDE THE HULL INSTALLATION INSIDE THE HULL INSTALLATION Inside the hull installation requires the mount system and control head be installed and operational. See Installing the Control Head for instruction on installing the unit. Inside the hull mountin g generally produces good results in single thickness fiberglass - hulled boats. ...
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Humminbird LCR120 - 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. ...
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Humminbird LCR120 - page 14
INSTALLATION INSIDE THE HULL INSTALLATION 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 b egins to skip or miss the bottom at higher speeds, the transducer needs to be moved. If depth performance is required, test the fish ...
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Humminbird LCR120 - page 15
INSTALLATION 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 mo ...
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Humminbird LCR120 - 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 ...
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Humminbird LCR120 - page 17
INSTALLATION CONTROL HEAD INSTALLATION and one amp fuse (not inc luded) 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 batter y) may be necessary. Step Thre ...
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Humminbird LCR120 - page 18
Optional: If the ca bles 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). ...
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Humminbird LCR120 - page 19
INSTALLATION CONTROL HEAD INSTALLATION Step Five - Assembling the Connector Holder 1. Insert the cabl e connectors into the connector holder. The cable connectors are labeled, and there are corresponding labels on the connector holder (Figure 26). The slots for the connectors are keyed to prevent reverse installation, so do not force the connector ...
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Humminbird LCR120 - page 20
INSTALLATION TEST THE INSTALLATION TEST THE INSTALLATION Testing should be performed with the boat in the water, however you can initially confirm basic operation with the boat trailered. Press POWER once to turn the unit on. There will be an audible chirp when any button is pressed to confirm the button press. If the unit does not power - up, ensu ...
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Humminbird LCR120 - page 21
Mounting the LCR 120 Before mounting the LCR 120, gather the parts you need: LCR 120, mounting hardware j kit power cable, and sensor cable. If the sensor cable is not long enough for your installation, see “Accessories” earlier in this manual for infor mation on the EC - 6 10’ extension cable Next, consider where to mount the LCR 120. The ...
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Humminbird LCR120 - page 22
sensitivity level for conditions. Momentarily, you’ll see the reading start to “March” across the screen from right to left. 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. If the L ...
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Humminbird LCR120 - page 23
The unit must be turned off before you start the simulator. To activate it, press down and hold the POWER button until a chirping sound beg ins. Release the button, and the built - in simulator begins displaying the typical LCR 120 a typical LCR 120 reading. You can use the simulator to learn the functions explained in the following pages, just as ...
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Humminbird LCR120 - 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 o n and off simply by pressing ON - ...
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Humminbird LCR120 - page 25
Units 2. Selecting Units; Factory Setting: MPH/SM The LCR 120 has no provision for speed and water temp erature accessories. Because of this, the UNITS menu has no effect on the operation of the unit. Sensitivity 3. Selecting Sensitivity; Factory Setting: +0 The LCR 120 automatically adjusts to the proper amount of sensitivity for conditions (i.e. ...
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Humminbird LCR120 - page 26
Bottom Alarm 4. Enabling Bottom Alarm; Factory Setting: Off The Bottom Alarm lets you specify the minimum depth you want to maintain. To use it, select BOTTOM ALARM; then press the ON - OFF button to activate the alarm, and the Up or Down arrow button to adjust the depth at which the alarm depth when this function is on. When Bottom Alram is on, yo ...
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Humminbird LCR120 - page 27
part of the display. By pressi ng 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 v ariation in sonar characteristics of different species, typi ...
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Humminbird LCR120 - 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. This is an ideal featu ...
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Humminbird LCR120 - page 29
Display Speed 8. Setting Display Speed; Fa ctory Setting: One Level Below Maximum The LCR 120 display is “updated” (advances across the screen) as you move through the water. The speed at which the display is updated depends on the Display Speed setting. To adjust it, select DISPLAY SPEED, and p ress the Up arrow button for a faster setting or ...
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Humminbird LCR120 - page 30
as the depth changes. In this “Auto Depth Range” mode, the bottom is blacked - in for easy - to - understand readings. If you prefer, you can turn Auto Depth Range off. Select DEPTH RANGE, press ON - OFF, and adjust the Depth Range with the Up or Down arrow button. In this “Manual Depth Range” mode, the bottom is not blacked in. This lets y ...
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