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Never leave the unit in a closed car or trunk—the extremely high temperatures generated in hot weather can damage the electronics. 37 Troubleshooting Do not attempt to repair the PiranhaMAX™ yourself. There are no user-serviceable parts inside, and special tools and techniques are required for assembly to ensure the waterproof integrity of the housing. Repairs should be performed only by authorized Humminbird technicians. Many requests for repair received by Humminbird® involve units that do not actually need repair. These units are returned “no problem found.” If you have a problem with your PiranhaMAX™, use the following troubleshooting guide before calling the Customer Resource Center or sending your unit in for repair. 1. Nothing happens when I turn the unit on. Check the power cable connection at both ends. Be sure the cable is connected correctly to a reliable power source — red lead to positive, black lead to negative or ground. Ensure the power available is between 10 and 20 VDC. If the unit is wired through a fuse panel, ensure the panel is powered. Often accessory fuse panels are controlled by a separate switch or the ignition switch. Also, often a fuse can appear to be good when it is not. Check the fuse with a tester or replace it with a fuse known to be good. Check the power connection to the PiranhaMAX™. It is possible to force the power cable connector into the cable holder incorrectly. If the connector is reversed, the unit will not work. Examine the contacts on the back of the unit to ensure there is no corrosion. 2. There is no transducer detected. The PiranhaMAX™ has the ability to detect and identify that a transducer is connected. When powering on, if a message indicates “transducer not connected”, make sure that an appropriate transducer connector is plugged into the unit. In addition, inspect the transducer cable from end to end for breaks, kinks, or cuts in the outer casing of the cable. Also make sure that the transducer is fully submerged in water. 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 actions identifies an obvious problem, the transducer itself is probably at fault. Be sure to include the transducer if returning the unit for repair. 38 3. There is no bottom reading visible on the display. If the loss of bottom information occurs only at high boat speeds, the transducer needs adjusting – see your PiranhaMAX™ Installation Guide for details. Also, in very deep water, it may be necessary to increase the sensitivity setting manually to maintain a graphic depiction of the bottom. If you are using a transducer switch to connect two transducers to the PiranhaMAX™, make sure that the switch is in the correct position to connect a transducer that is in the water. (If a trolling motor transducer is selected and the trolling motor is out of the water, no sonar information appears.) If none of these actions solves 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 actions identifies an obvious problem, the transducer itself may be at fault. 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 PiranhaMAX™ will work reliably in water 3 feet (90 cm) or deeper. Remember that the depth is measured from the transducer, not from the surface of the water. 5. The unit comes on before I press the POWER-MENU key, 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 will 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. 39 7. My unit loses power at high speeds. Your PiranhaMAX™ has 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. 8. The display begins to fade out. Images are not as sharp as normal. Check the input voltage. The PiranhaMAX™ will not operate on input voltages below 10 VDC. 9. The display shows many black dots at high...

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