Eagle Electronics 250 DS, 250 DF manual No fish arches when the Fish I.D. feature is off, Noise

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Try using resistor spark plugs or routing the sonar unit's power and transducer cables away from other electrical wiring on the boat.

No fish arches when the Fish I.D. feature is off:

1.Make certain the transducer is pointing straight down. This is the most common problem if a partial arch is displayed.

2.The sensitivity may not be high enough. In order for the unit to dis- play a fish arch, it has to be able to receive the fish's echo from the time it enters the cone until it leaves. If the sensitivity is not high enough, the unit shows the fish only when it is in the center of the cone.

3.Use the Zoom feature. It is much easier to display fish arches when zoomed in on a small range of water than a large one. For example, you will have much better luck seeing fish arches with a 30 to 60 foot range than a 0 to 60 foot range. This enlarges the targets, allowing the dis- play to show much more detail.

4.The boat must be moving at a slow trolling speed to see fish arches. If the boat is motionless, fish stay in the cone, showing on the screen as straight horizontal lines.

NOISE

A major cause of sonar problems is electrical noise. This usually ap- pears on the sonar's display as random patterns of dots or lines. In se- vere cases, it can completely cover the screen with black dots, or cause the unit operate erratically, or not at all.

To eliminate or minimize the effects of electrical noise, first try to de- termine the cause. With the boat at rest in the water, the first thing you should do is turn all electrical equipment on the boat off. Make sure the engine is also off. Turn your sonar on, then turn off Noise Re- ject [also known as the ASP feature (Advanced Signal Processing)]. Sensitivity should be set at 90-95 percent. There should be a steady bottom signal on the display. Now turn on each piece of electrical equipment on the boat and view the effect on the sonar's display. For example, turn on the bilge pump and view the sonar display for noise.

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Contents FishEasy 250 DS & SeaFinder 250 DF Copyright 2006 LEI-Eagle All rights reserved Table of Contents Troubleshooting General IntroductionSonar Back-up memoryAutomatic ranging Zoom bottom trackHow Sonar Works Preparations Dual Search & Dual FrequencyPage Page Recommended Tools and Supplies Section Installation & AccessoriesSelecting a Transducer Location How low should you go? Shoot-thru-hull vs. Transom Mounting Transom Transducer Assembly and Mounting Insert bolt and check transducer position on transom Assemble transducer and bracket Bottom Hull Flat-bottom hull Deep-vee hull Attach motor mounting bracket to transducer Transducer Orientation and Fish Arches Transducer angles and their effects on fish arches Shoot-Thru-Hull Preparation True bottom Second bottom Manual range setting Transducer location High speed Trolling speed Shoot-thru-hull Installation Power and Cable Connections Page Mounting The Sonar Unit In-Dash or Bracket In-Dash InstallationIn-Dash Template Bracket Installation173.9 137.9 72.9 23.4 157.9 Millimeter 56.9 Inch Portable Installation Portable Transducer Assembly Tie nylon Cord here Suction Portable transducer installed on boat transom Keyboard Basics OperationUP & Down Arrows ↑ ↓ MemoryMenus Display Full Chart FasTrack Depth Range Zoom Sensitivity To adjust sensitivity in Manual Mode To adjust sensitivity in Auto ModeGrayline Grayline scroll bar Chart Speed Frequency Fish I.D. Fish arches Fish I.D. symbols FishTrack Depth Alarms AlarmsFish Alarm Shallow Alarm Battery Alarm Deep AlarmNoise Rejection and ASP Noise Rejection menu To display Depth Temperature DisplayDepth Display To display Temperature Units VoltageBacklight To display voltageSimulator ContrastTo select a language Set LanguageSoftware Information Reset Options Page Unit freezes, locks up, or operates erratically Unit turns on only in simulator modeUnit wont turn on Page Noise No fish arches when the Fish I.D. feature is offPage Page Page Eagle Electronics Not toll-free How to Obtain Service…Accessory Ordering Information for all countries Visit our web site