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Make sure no rain or water splash leaksinto the equipment. Fire or electrical shock can result if water leaks in the equipment. SAFETYINSTRUCTIONSSAFETY INSTRUCTIONS WARNINGWARNING WARNINGWARNING ELECTRICAL SHOCK HAZARD Do not open the equipment. Only qualified personnel should work inside the equipment. Make sure no rain or water splash leaksinto the equipment. Fire or electrical shock can result if water leaks in the equipment. Keep heater away from equipment. A heater can melt the equipment’s power cord, which can cause fire or electrical shock. Use the proper fuse. Fuse rating is shown on the equipment. Use of a wrong fuse can result in damage to the equipment. Immediately turn off the power at theswitchboard if water leaks into the equipment or something is dropped inthe equipment. Continued use of the equipment can cause fire or electrical shock. Contact a ONWA agent for service. Do not disassemble or modify theequipment. Fire, electrical shock or serious injury can result. Do not place liquid-filled containers onthe top of the equipment. Fire or electrical shock can result if a liquid spills into the equipment. Immediately turn off the power at theswitchboard if the equipment is emittingsmoke or fire. Continued use of the equipment can cause fire or electrical shock. Contact a ONWA agent for service. TABLE OF CONTENTS INTRODUCTION 2.15 Alarms 2-12 2.16 White Marker 2-14 PRINCIPLE OF OPERATION 3. INTERPRETING THE DISPLAY 3-1 SYSTEM CONFIGURATION 3.1 Zero Line 3-1 3.2 Fish School Echoes 3-1 1. CONTROLS, INDICATIONS1-1 3.3 Bottom Echo 3-1 1.1 Control Description1-1 3.4 Surface Noise/Aeration 3-2 1.2 Indications 1-3 4-1 4. MAINTENANCE, TROUBLESHOOTING 2. BASIC OPERATION2-1 4.1 Maintenance 4-1 2.1 Turning the Power On/Off2-1 4.2 Basic Troubleshooting 4-3 2.2 Adjusting Brilliance2-1 4.3 Transducer Check 4-4 2.3 Display mode Selection, Description2-1 4.4 Water Temperature 2.4 Adjusting Gain2-4 Sensor (option) Check 4-4 2.5 Automatic Operation2-4 2.6 Selecting Picture Advance Speed2-5 MENU TREE A-1 2.7 Display Range selection2-5 2.8 Erasing Weak Echoes2-6 SPECIFICATIONS SP-1 2.9 Measuring Depth to a Fish School2-7 2.10 A-scope Display2-7 2.11 Menu Operation2-8 2.12 Suppressing interference2-11 INDEX Index-1 2.13 Suppressing Low Level Noise2-11 2.14 Selecting Background and Echo Colors 2-12 INTRODUCTION Congratulations on your choice of the ONWA KF-667 Color Video Sounder. We are confident that you will enjoy many years of operation with this fine piece of equipment. The KF-667 is just one of the many ONWA developments in the field of echo sounding. The compact, lightweight but rugged unit is easy to install and operate and is suitable for both fresh and saltwater applications. This unit is designed and constructed to withstand the rigors of the marine environment. However, to obtain optimum performance from this unit, you should carefully read and follow the recommended procedures for operation and maintenance. No machine can perform to the utmost of its ability unless it is installed, operated and maintained properly We would appreciate feedback from you, the end-user,about whether we are achieving our purposes. Thank you for considering and purchasing ONWA equipment. Features The KF-667 dual-frequency(50KHz and 200KHz)color video sounder has a large variety of functions, all contained in a splash-proof rugged plastic case that is compact to fit small boats. The principal features of the KF-667 are User-friendly design for simplified operation. A wide variety of display modes: bottom-lock expansion, marker zoom and unique bottom zoom displays. Potent 300 W transceiver. 8-color presentation(including background) on a 5.6 diagonal TFT LCD, providing vivid presentation of underwater conditions. AUTO function permits unattended range and gain setting operations. The range scale and gain change automatically so that the bottom is displayed in reddish brown or red on the lower half of the screen. A-scope display gives excellent bottom fish discrimination, vital for bottom trawler and lobster/crab potter. Digital and analog displays of navigational data. Alarms: fish, bottom, water temperature (requires appropriate sensor). Six pulse lengths for excellent performance on both shallow and deep ranges. Universal 12-24 VDC power supply drawing 30 W of power at maximum. Water temperature sensor optionally available. PRINCIPLE OF OPERATION This Color Video Sounder determines the distance between its transducer and underwater objects such as fish, lake bottom or seabed and displays the results on a 5.6-inch color screen. It does this by utilizing the fact that an ultrasonic wave transmitted through water travels at a nearly constant speed of 4800 feet (1500 meters) per second. When a sound wave strikes an underwater object such as fish or sea bottom, part of the sound wave is reflected back toward the source. Thus by calculating the time difference between the transmission of a sound wave and the reception of the reflect...