Onwa KF-667 manual Transducer Check, Water Temperature Sensor option Check

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4.3 Transducer Check

A simple and reliable check of the transducer is to temporarily replace the transducer with a new one. If the sensitivity is considerably improved through this change, the transducer is probably faulty. This method is especially useful for inside-hull or through-hull installation.

Another method is to listen to the transmission sound. Haul the transducer from the water and turn on the power. Put your ear near the transducer face and carefully listen to the transmission sound. If you can hear a clicking sound, the transducer is probably normal. Next, rub the transducer face with your hand and observer whether noise appears on the screen. The appearance of noise indicates the transducer is normal. In case of neither sound nor noise, the transducer is probably faulty.

4.4 Water Temperature Sensor (option) Check

The idea of the transducer check can apply to this case, too; temporarily substitute a new sensor. If the temperature indications become normal, your sensor may be faulty.

When a new sensor is not available, the water temperature indication should change when you touch the thermosensor.

4-4

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Contents Model KF-667 Safety Instructions Table of Contents Introduction FeaturesPage Principle of Operation Display Unit System ConfigurationTransducer PowerTD/Temp Control Function CONTROLS, IndicationsBrill Voltage IndicationsDisplay mode selection Turning the Power On/OffAdjusting Brilliance Display Mode Selection, Description200K, 50K high frequency, low frequency mode Display mode descriptionDual frequency mode Marker Zoom Zoom mode high or low frequencyEnabling automatic operation Adjusting GainAutomatic Operation How it worksDisplay Range Selection Selecting Picture Advance SpeedBasic range selection Range shifting Erasing Weak EchoesScope Display Measuring Depth to a Fish SchoolMenu selection Menu OperationSystem Menu Main menu descriptionMenu item Description System Menu System menu descriptionSuppressing Low Level Noise Suppressing InterferenceAlarm description AlarmsSelecting Background and Echo Colors Silencing the buzzer Activating/deactivating an alarmWhite Marker Bottom Echo Interpreting the DisplayZero Line Fish School EchoesSurface Noise/Aeration General checking MAINTENANCE,TROUBLESHOOTING Maintenance Replacement of fuseMaintenance of the transducer CleaningBasic troubleshooting Basic TroubleshootingTransducer Check Water Temperature Sensor option CheckMENU1 Menu TreeKF-667 Specifications on Color Video SounderPower Supply Index