Humminbird 120 manual Unit comes on before I press POWER, and wont turn off

Page 33

MAINTENANCE AND WARRANTY

TROUBLESHOOTING

5. The unit comes on before I press POWER, and won't turn off.

Check the transducer cable. If the outer jacket of the cable has been cut and the cable is in contact with bare metal, you need to repair the cut with electrical tape. If there is no problem with the cable, disconnect the transducer from the unit and see if the problem is corrected, to confirm the source of the problem.

6. I get gaps in the reading at high speeds.

Your transducer needs adjusting. If the transducer is transom-mounted, there are two adjustments available to you - height and running angle. Make small adjustments and run the boat at high speeds to determine the effect. It may take several tries to optimize high speed operation. This can also be a result of air or turbulence in the transducer location caused by rivets, ribs, etc.

7. My unit loses power at high speeds.

Most Humminbird fishfinders have over-voltage protection that turns the unit off when input voltage exceeds 20 VDC. Some outboard motors do not effectively regulate the power output of the engine's alternator and can produce voltage in excess of 20 volts when running at high RPMs. Your fishfinder displays input voltage in the Diagnostic screen. Use this readout to determine if the voltage exceeds 20 VDC.

8. The screen begins to fadeout. Images are not as sharp as normal.

Check the input voltage using Diagnostic. The fishfinder will not operate on input voltages below 10 VDC.

9.The display shows many black dots at high speeds and high sensitivity settings.

You are seeing noise or interference caused by one of several sources. Noise can be caused by other electronic devices. Turn off any nearby electronics and see if the problem goes away. Noise can also be caused by the engine. If engine noise is causing the interference, the problem will intensify at higher RPMs. Increase the engine speed with the boat stationary to isolate this cause. Propeller cavitation can appear as noise on-screen. If the transducer is mounted too close to the propeller, the turbulence generated can interfere with the sonar signal. Ensure that the transducer is mounted at least 15" (38cm) from the prop.

Page 32 Page 34
Image 33
Page 32 Page 34
Contents Page Table of Contents Accessories Installation PreparationInstallation Overview Parts SuppliedDetermining How to Mount the Transducer Portable Mounting Alternate Transducers and Mounting MethodsTrolling Motor Mounting Thru-Hull MountingTransducer Exchange Beginning InstallationInstallation Transom InstallationStep One Determine Where to Mount the Transducer Step Three Assemble the Transducer Step Two Drill the Mounting HolesStep Four Mount the Transducer to the Transom Step Five Adjust the Running Position of the TransducerStep Six Route the Cable Inside the Hull Installation Step One Determine the Mounting LocationStep Two Test the Mounting Location Step Three Permanently Mount the Transducer Control Head Installation Step One Determine Where to MountStep Two Connect the Power Cable to the Boat Step Four Run the Cables Step Three Drill the Mounting HolesYour Humminbird is now ready for operation Step Five Assembling the Connector HolderTest the Installation Thank YOU Thank YOUHOW Sonar Works Using the Platinum IDUsing the Platinum ID Platinum ID Features Operating the Platinum ID Using the BUILT-IN SimulatorPlatinum ID Functions Using the Platinum ID Factory Setting MPH/SM Factory Setting Fish SymbolsSelecting Sensitivity Factory Setting +0 Enabling Fish Alarm Factory Setting OFF Factory Setting One level below maximum Using Bottom-Lock Factory Setting OFFFactory Setting OFF Factory Setting on AutomaticSpecifications Maintenance Maintenance and WarrantyTroubleshooting Nothing happens when I turn the unit onThere is no transducer detected There is no bottom reading visible on the display My unit loses power at high speeds Unit comes on before I press POWER, and wont turn offGet gaps in the reading at high speeds Screen begins to fadeout. Images are not as sharp as normalHumminbird ONE Year Full Warranty Service Policy Customer Support

120 specifications

The Humminbird 120 is a pioneering fish finder that has gained recognition among anglers for its exceptional performance and user-friendly features. Designed with cutting-edge technology, this device offers a comprehensive suite of features that enhance fishing experiences on the water.

At the heart of the Humminbird 120 is its advanced sonar technology, which allows users to see fish and underwater structures with remarkable clarity. Equipped with dual-beam sonar, the device provides two different cone angles. The narrow beam offers high precision for locating specific targets, while the wide beam covers a larger area, making it easier to locate schools of fish.

One of the standout features of the Humminbird 120 is its easy-to-read display. The unit features a large, high-contrast screen with multiple color options, allowing users to customize their viewing experience. This clarity is essential, especially in bright sunlight or varying light conditions, ensuring that important information is visible at a glance.

In addition to fish identification, the Humminbird 120 packs a range of features designed to help anglers navigate their environment effectively. It includes advanced mapping capabilities, enabling users to create depth contours and view detailed underwater topography. This is particularly beneficial for identifying potential fishing hotspots and understanding the structure of the lake or riverbed.

The device also supports features such as temperature readings, which can be essential for understanding fish behavior and optimizing fishing strategies. The integrated GPS functionality further enhances usability by allowing users to mark waypoints, navigate through previously mapped areas, and avoid potential hazards while on the water.

Another practical aspect of the Humminbird 120 is its ease of installation and setup. Whether you have a small boat or a larger vessel, the device can be easily mounted and configured. The intuitive interface ensures quick access to functions, making it an excellent choice for both novice and experienced anglers alike.

Durability is also key in the design of the Humminbird 120. Built to withstand the rigors of regular use, the device is water-resistant and designed for various environmental conditions.

In summary, the Humminbird 120 combines advanced sonar technology, a clear display, effective mapping tools, and robust durability, making it a valuable asset for any angler looking to enhance their fishing experience. Whether you are searching for fish or exploring underwater terrain, the Humminbird 120 delivers reliability and performance on the water.
Top Page Image Contents