Onwa KF-667 manual Cleaning, Maintenance of the transducer

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4.1.3 Cleaning

Keep the equipment clean and dry at all times. Dust or loose dirt should be wiped off with a soft, dry cloth. Do not use chemical cleaners to clean the display unit-they can remove paint or markings.

4.1.4 Maintenance of the transducer

Marine life on the transducer face will result in gradual decrease in the sensitivity. Check the transducer face for cleanliness each time the boat is hauled out of the water. Carefully remove any marine life with a piece of wood or fine sandpaper.

4-2

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Contents Model KF-667 Safety Instructions Table of Contents Introduction FeaturesPage Principle of Operation Display Unit System ConfigurationTD/Temp PowerTransducer Control Function CONTROLS, IndicationsBrill Voltage IndicationsAdjusting Brilliance Turning the Power On/OffDisplay Mode Selection, Description Display mode selectionDual frequency mode Display mode description200K, 50K high frequency, low frequency mode Marker Zoom Zoom mode high or low frequencyAutomatic Operation Adjusting GainHow it works Enabling automatic operationBasic range selection Selecting Picture Advance SpeedDisplay 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 InterferenceSelecting Background and Echo Colors AlarmsAlarm description Silencing the buzzer Activating/deactivating an alarmWhite Marker Zero Line Interpreting the DisplayFish School Echoes Bottom EchoSurface Noise/Aeration Maintenance MAINTENANCE,TROUBLESHOOTINGReplacement of fuse General checkingMaintenance of the transducer CleaningBasic troubleshooting Basic TroubleshootingTransducer Check Water Temperature Sensor option CheckMENU1 Menu TreeKF-667 Specifications on Color Video SounderPower Supply Index