Koden Electronics RB715A Marine Radar RA41C User Manual 20
Koden Electronics Co., Ltd Marine Radar RA41C 20
Contents
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CHAPTER 7. TROUBLESHOOTING
This chapter explains how to identify trouble locations when the radar is found
faulty and how to request repair.
It happens any disorder, keep pressing POWER key for 3 sec. to power off. Then
wait 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 results
There are high voltage circuits inside of this radar.
Do not attempt to open the rear cover of display
unit or disassemble internal parts. When you open
the 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 found
faulty 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 check
whether there is any fault in your radar.
7.2 Inspecting Each Part
!WARNING
82
When you have finished self-check, inspect each part of the radar according to
Tab.7-1.
Tab. 7-1 Troubleshooting
Symptom Cause Corrective action
(1) Radar cannot be powered
on. Power cable is disconnected. Connect power cable correctly.
Power supply voltage is off
specified 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. (See
Section 5.3.)
LCD is faulty. Contact your dealer.
(3) Screen is dark. Brightness is improperly ad-
justed. Use BRIL key to adjust. (See
Section 5.3.
Backlight is faulty. Contact your dealer.
(4) Video does not appear al-
though characters are displayed. Interconnecting cable is out of
place. Connect interconnecting cable
correctly.
(5) Echo image on screen differs
from actual image. Ship’s heading is incorrectly set. Set ship’s heading correctly.
(See Section 5.5.4.5.4)
Timing adjustment is incorrectly
set. 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 to
5.3.8.)
Magnetron has degraded. Contact your dealer.
(7) Too much noise. Radar is not tuned correctly Adjust TUNE. (See Section
5.5.3.4)
Radar is not grounded to earth. Connect grounding wire. (See
Section 3.4 to 3.6.)
(8) Not responded when key is
pressed. Panel keys are not contacting. Contact your dealer.
Power supply circuit is faulty. Contact your dealer.