MAINTENANCE
TROUBLESHOOTING
mild cleaner. Do not wipe while dirt or grease is on the lens. Be careful to avoid scratching the lens.
•If your boat remains in the water for long periods of time, algae and other marine growth can reduce the effectiveness of the transducer. Periodically clean the face of the transducer with liquid detergent. Pivoting the transducer up in the bracket may allow better access for inspection or cleaning.
•If your boat remains out of the water for a long period of time, it may take some time to wet the transducer when returned to the water. Small air bubbles can cling to the surface of the transducer and interfere with proper operation. These bubbles dissipate with time, or you can wipe the face of the transducer with your fingers after the transducer is in the water.
•Never leave the 250DX in a closed car or
TROUBLESHOOTING
Do not attempt to repair the 250DX yourself. There are no user serviceable parts inside, and special tools and techniques are required for reassembly 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 250DX, use the following troubleshooting guide before calling Customer Support or sending your unit in for repair. The 250DX contains several tools that can aid in determining if there is a problem and how to isolate and repair the problem in many cases.
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
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