the problem, inspect the transducercable from end to end for breaks, kinks, or cuts in the outer casing of the cable. If the transduceris connected to the unit througha 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.

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 PiranhaMAXwill not operate on input voltages below 10 VDC.

9.The display shows many black dots at high speeds and high sensitivitysettings. You are seeing noise or interference caused by one of several sources. Noise can be caused by 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. Increasethe engine speed with the boat stationaryto isolate this cause. Propeller cavitation can also appear as noise on the display. If the transducer is mounted too close to the propeller, the turbulence generated can interferewith the sonarsignal. Make sure that the transduceris mounted at least 15" (380 mm) from the propeller.

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Troubleshooting