Lowrance electronic X105C DF Unit wont turn on, Unit freezes, locks up, or operates erratically

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Section 5:

Sonar Troubleshooting

If your unit is not working, or if you need technical help, please use the following troubleshooting section before contacting the factory customer service department. It may save you the trouble of returning your unit for repair. For contact information, refer to the last page, just inside the back cover of this manual.

Unit won't turn on:

1.Check the power cable's connection at the unit. Also check the wiring.

2.Make sure the power cable is wired properly. The red wire connects to the positive battery terminal, black to negative or ground.

3.Check the fuse.

4.Measure the battery voltage at the unit's power connector. It should be at least 10 volts. If it isn't, the wiring to the unit is defective, the battery terminals or wiring on the terminals are corroded, or the bat- tery needs charging.

Unit freezes, locks up, or operates erratically:

1.Electrical noise from the boat's motor, trolling motor, or an accessory may be interfering with the sonar unit. Rerouting the power and trans- ducer cables away from other electrical wiring on the boat may help. Route the sonar unit's power cable directly to the battery instead of through a fuse block or ignition switch

2.Inspect the transducer cable for breaks, cuts, or pinched wires.

3.Check the transducer and power connector. Make sure it's securely plugged in to the unit.

Weak bottom echo, digital readings erratic, or no fish signals:

1.Make sure the transducer is pointing straight down. Clean the face of the transducer. Oil, dirt and fuel can cause a film to form on the trans- ducer, reducing its effectiveness. If the transducer is mounted inside the hull, be sure it is shooting through only one layer of fiberglass and that it is securely bonded to the hull. When attaching a transducer to the inside of a hull, ONLY use the epoxy available from LEI (order information is inside the back cover). Do NOT use RTV silicone rubber adhesive or any other type of epoxy. The LEI epoxy is specially formulated so that it will cure properly for shoot-through applications.

2.Electrical noise from the boat's motor can interfere with the sonar. This causes the sonar to automatically increase its discrimination or noise rejection feature. This can cause the unit to eliminate weaker signals such as fish or even structure from the display.

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Contents X100C X105C DF Lowrance Electronics Inc 12000 E. Skelly Dr Tulsa, OK USA Table of Contents Page Read Me First Page How Sonar Works Menu Commands How to use this manual typographical conventionsArrow Keys KeyboardPreparations Transducer InstallationDual-frequency transom installations Single-frequency transom installationsSingle-frequency trolling motor installations Shoot-through hull installationsGood location Poor location Location Poor angle How low should you go?Deadrise less than Strakes Pad Transom Transducer centerline Hull bottom Shoot-thru-hull vs. Transom MountingDot Assembling the bracketTransducerTransducer bracket Ratchet Aligning the transducer on the transomRatchets Drilling mounting holes Assembling the transducerTransom Attaching transducer to transomBottom Hull Flat-bottom hull Deep-vee hull TMB-S bracket Internal tooth washer Bolt Nut Flat washer Trolling Motor Bracket Installation single-frequency onlyTransducer aimed Hulls With Floatation MaterialsPartial fish arches Transducer location High speed Trolling speed Testing Determines Best LocationTrue bottom Second bottom Manual range setting Spread epoxy here Sand this surface Shoot-thru-hull InstallationOptional Speed Sensor Installation Optional Temperature SensorTransom Bottom of hull Good locationPowering a Nmea 2000 Buss Nmea 2000 Power cable Power ConnectionsPowering Your Unit Power Supply cable red and black wires Power connections for the units in this series Nmea 2000 Cable Connections Connecting to a Nmea 2000 NetworkNmea 0183 Cable Connections To Nmea To sonar Network port Units Network SocketMounting the Unit Bracket, In-Dash or Portable Front Bracket Installation173.9 77.1 27.6 137.9 Millimeter 56.9 Inch Portable Installation Other AccessoriesIn-Dash Installation Face Cover Keyboard Basic Sonar OperationMain Menu Power/lights on and offMain Menu Pages Page Sonar Page, showing full sonar chart mode Basic Sonar Quick Reference Sonar Operations To adjust sensitivity To Restore Factory Settings Fish Symbols vs. Full Sonar ChartOther Free Training Aids Page To change the ASP level ASP Advanced Signal ProcessingDepth Alarms AlarmsZone Alarm Fish Alarm Calibrate Speed Chart SpeedColorLine Thin or no ColorLine Wider ColorLine Depth CursorCursor line Depth box Depth Range AutomaticDepth Range Manual To switch to Manual Depth RangeDepth Range Upper and Lower Limits To turn Auto Depth Range on againFish arches Area zoomed To change the upper and lower limitsTo turn off upper and lower limits Fish I.D. Fish Symbols & DepthsFasTrack To turn on FishTrack To turn the Fish I.D. feature onFishTrack Frequency Change Transducer Frequency X105C DF only Symbols with FishTrack depthsTo change the frequency setting to 200 kHz To change the frequency setting to 50 kHzHyperScroll Noise RejectionTo turn off displayed data To change displayed data font size Ping Speed & HyperScrollTo change Ping Speed To turn off HyperScroll Reset OptionsReset Water Distance Set Keel Offset Automatic Sensitivity Sensitivity & Auto SensitivityTo turn Auto Sensitivity back on To adjust sensitivity in auto modeTo adjust sensitivity in manual mode Sonar Page & Sonar Chart Display Options Sonar Color ModeTo change the chart mode color scheme Full Sonar ChartDigital Data/Chart Split Zoom Sonar ChartCustomizing the Digital Data/Chart Screen FlashGraf Flasher Sonar SimulatorSurface Clarity Stop ChartTo adjust the Surface Clarity level Zoom & Zoom Bar Upper and Lower LimitsZoom Pan Page Unit freezes, locks up, or operates erratically Unit wont turn onNoise No fish arches when the Fish I.D. feature is offPage Page Supplemental Material Index Page Page Page Lowrance Electronics Full ONE-YEAR Warranty Not toll-free How to Obtain Service…Accessory Ordering Information for all countries Visit our web site