Koden Electronics RB719A Marine Radar RA55 User Manual C17 CHAP6 Mainte 1

Koden Electronics Co., Ltd Marine Radar RA55 C17 CHAP6 Mainte 1

C17

RA51/52/53/54/55 INSTRUCTION MANUAL – 05 67 CHAPTER 6. MAINTENANCE AND INSPECTION There are high voltage circuits inside this radar. Do not attempt to open the rear cover of display unit or disassemble internal parts. Leave this to qualified service personnel. When you open the radome, power must be off. Never work on or near the radome while it is operating. Even if the power switch is OFF, this radar still has electrically charged components inside. Tab. 6-1 Owner Inspection and Maintenance Items Replaceable items: (1) Magnetron This component is located in the scanner. If distant echo images have become less visible, the magnetron probably is degraded. Contact your dealer or authorized repair center for this service Period of the replacement: 3000hour(typical) (500hour guarantee) (2) LCD backlight If the display screen becomes extremely dark and its illumination cannot be increased by adjusting the Brilliance control, the LCD backlight may be faulty. Contact your dealer or authorized repair center for this service Period of the replacement: 15000hour(typical) (1000hour at 0 °C) Interval Item Procedure 3-6 months Scanner hardware Check if the scanner’s mounting bolts are cor-roded or loose. LCD display Clean filter and LCD screen surfaces with a soft moist cloth. 6-12 months Antenna drive Apply an even coating of grease to the entire surface of the antenna drive gear. Be certain to use grease that will not harm plastic surfaces. Electrical connectors Check electrical connectors on back panel of dis-play unit for proper contact by unscrewing them and examining the contacts. Remove any corro-sion by polishing or using a contact cleaning agent. Antenna motor brushes (open array antennas) Check length of brushes and replace if under 6mm. ! WARNING
68 RA51/52/53/54/55 INSTRUCTION MANUAL – 05 (3) Fuse The fuse is built in the power supply cable. When working on the scanner, you can hang the upper half of the radome using a piece of wire or cord through holes to either side of the mounting screws. Push Power supply cable Wire(White) Turn counterclockwise and pull Fuse Spring Push and turn clockwise Replace new fuse To display unit Fixing screw Hole A: Top view Cord Cord A Radome(Upper) Radome(bottom)

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