Humminbird 425 SX manual Unit comes on before I press POWER, and won’t turn off

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ADVANCED FEATURES

TROUBLESHOOTING

If you are using a transducer switch to connect two transducers to the 425SX, ensure the switch is in the correct position to connect a transducer that is in water. (If a trolling motor transducer is selected and the trolling motor is out of water, no sonar information appears.)

If none of the above solve the problem, inspect the transducer cable from end to end for breaks, kinks, or cuts in the outer casing of the cable. If the transducer is connected to the unit through a switch, temporarily connect it directly to the unit and try again. If none of these items identifies an obvious problem, the transducer itself may be the problem. Be sure to include the transducer if returning the unit for repair.

4.When in very shallow water, I get gaps in the bottom reading and inconsistent digital depth indication.

The 425SX will work reliably in water .6m (2') or deeper. The depth is measured from the transducer, not necessarily from the surface.

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.

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Contents Operations Manual Thank YOU Table of Contents Parts Supplied Installation PreparationAccessories Installation OverviewDetermining How to Mount Transducer Installation OverviewTrolling Motor Mounting Alternate Transducers and Mounting MethodsAlternate Transducers and Mounting Methods Portable MountingBeginning Installation Beginning InstallationSimulator Operation Using the 425SXHOW Sonar Works HOW Sonar WorksSimulator Operation Feature MemoryWhat You See On-Screen Figure a What YOU see ON-SCREENSurface Clutter Rocky Bottom Hard Bottom Soft Bottom What YOU see on Screen Second Returns. When aID+ Fish Depth Control Functions Control FunctionsLarge Digit View To bring up the last menu used Keys. If no adjustment is made in the allottedAbbreviated Menu. The Arrow buttons often can be Menu Functions Menu FunctionsHigh Sensitivity Sensitivity at Low Sensitivity Depth Range Surface so any area of water between the surface Using the 425SX Using the 425SX On a Input voltage fromCalculations Are For Tracking yourAlarm menu under options, you will note that Bottom Black View ID+ On Raw Sonar Using the 425SX Using the Diagnostic Feature Advanced FeaturesUsing Diagnostic Depth offset is remembered after power is disconnectedAdvanced Features Maintenance MAINTENANCE/TROUBLESHOOTINGTroubleshooting There is no bottom reading visible on the display TroubleshootingNothing happens when I turn the unit on There is no transducer detectedGet gaps in the reading at high speeds Unit comes on before I press POWER, and won’t turn offFurther information on Humminbird products can be found at My unit loses power at high speedsSpecifications Page Use this template with transducer mounting bracket TOP

425 SX specifications

The Humminbird 425 SX is a sonar fish finder that combines advanced technology and user-friendly features to enhance the fishing experience. This device is ideal for anglers seeking reliable performance without compromising quality or functionality. With its robust design and cutting-edge features, the 425 SX has become a favorite among both novice and experienced fishermen.

One of the main features of the Humminbird 425 SX is its DualBeam Plus sonar technology. This innovative system allows users to switch between two sonar beams: a wider beam for searching large areas and a narrower beam for a more detailed view of the underwater structure and fish. With a depth capability of up to 600 feet, anglers can easily track fish and structures below the surface, ensuring no opportunities are missed.

The 425 SX is equipped with a high-resolution display, making it easier to read data in various lighting conditions. This 4.5-inch LCD screen provides clear and vibrant visuals, allowing users to interpret information quickly and accurately. The display also features a customizable color palette, letting anglers tailor the screen to their preferences for maximum visibility.

Another noteworthy characteristic of the Humminbird 425 SX is its fish identification feature. The device can recognize and differentiate fish species based on their size and depth, giving users valuable insights into what they might catch. This feature not only enhances the fishing experience but also helps in making informed decisions on bait and tackle.

The device also supports a range of advanced features, such as a built-in GPS system that allows users to mark waypoints for their favorite fishing spots, track their movements on the water, and navigate safely. The GPS functionality ensures that anglers can easily return to productive fishing locations, making the most of their time on the water.

Moreover, the Humminbird 425 SX’s durable construction ensures it can withstand the rigors of both freshwater and saltwater environments. Its waterproof design provides added peace of mind, protecting the device from potential damage caused by splashes or rain.

In conclusion, the Humminbird 425 SX is a versatile and user-friendly fish finder that offers invaluable features for anglers of all skill levels. With its DualBeam Plus sonar technology, high-resolution display, fish identification capabilities, built-in GPS, and durable design, this device proves to be an essential tool for anyone looking to enhance their fishing success. Whether you're out for a casual day on the water or targeting specific species, the Humminbird 425 SX will help you make the most of your fishing adventures.
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