Koden Electronics RB716A Marine Radar RA42C User Manual 20

Koden Electronics Co., Ltd Marine Radar RA42C 20

20

81CHAPTER 7.  TROUBLESHOOTINGThis chapter explains how to identify trouble locations when the radar is foundfaulty and how to request repair.It happens any disorder, keep pressing POWER key for 3 sec. to power off. Thenwait over 10 sec., when you power on again.If you find the radar is faulty, check it the following procedure described below.If you find as a result of inspection that the fault cannot be repaired on board, con-tact your distributor  for repair.For faster service, please let us know about followings when you request repair:(1)  Ship's name, place of anchorage, allowable repair period or time(2)  Radar type (This radar is RA40C, RA41C or RA42C.)(3)  Manufacturing number (indicated on the back of the display unit)(4)  Fault symptoms and inspection resultsThere are high voltage circuits inside of this radar.Do not attempt to open the rear cover of displayunit or disassemble internal parts. When you openthe radome for installation, power must be off.Even power switch is OFF, this radar is still sup-plied power inside.This chapter explains how to identify trouble locations when the radar is foundfaulty and how to request repair.7.1  Fault Diagnosis by Self-check                                   The radar incorporates a failure diagnostic function (called "self-check") to diag-nose faults by the equipment itself. Refer to "5.5.4.4 Fault Diagnosis by Self Check (SYSTEM CHECK)" and checkwhether there is any fault in your radar.7.2  Inspecting Each Part                                          !WARNING
82When you have finished self-check, inspect each part of the radar according toTab.7-1.Tab. 7-1  TroubleshootingSymptom Cause Corrective action(1) Radar cannot be poweredon. Power cable is disconnected. Connect power cable correctly.Power supply voltage is offspecified value Use Specified power supply.(See Section 3.2)Fuse in power cable is blown. Replace fuse. (See Chapter 6)(2) Nothing is displayed al-though radar is powered on. Brightness or contrast are im-properly adjustment. Use BRIL key to adjust. (SeeSection 5.3.)LCD is faulty. Contact your dealer.(3) Screen is dark. Brightness  is  improperly  ad-justed. Use BRIL key to adjust. (SeeSection 5.3.Backlight is faulty. Contact your dealer.(4) Video does not appear al-though characters are displayed. Interconnecting cable is out ofplace. Connect interconnecting cablecorrectly.(5) Echo image on screen differsfrom actual image. Ship’s heading is incorrectly set. Set  ship’s  heading  correctly.(See Section 5.5.4.5.4)Timing adjustment is incorrectlyset. Set timing adjustment correctly.(See Section 5.5.4.5.4)(6) Echo images are blurred. GAIN, STC, or FTC is improp-erly set. Adjust. (See Section 5.3.6 to5.3.8.)Magnetron has degraded. Contact your dealer.(7) Too much noise. Radar is not tuned correctly Adjust  TUNE.  (See  Section5.5.3.4)Radar is not grounded to earth. Connect  grounding  wire.  (SeeSection 3.4 to 3.6.)(8) Not responded when key ispressed. Panel keys are not contacting. Contact your dealer.Power supply circuit is faulty. Contact your dealer.

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