Koden Electronics RB716A Marine Radar RA42C User Manual 20

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Document ID	111155
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Document Description	20
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Document Type	User Manual
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Date Submitted	2000-07-30 00:00:00
Date Available	2000-12-12 00:00:00
Creation Date	2000-07-31 14:35:40
Producing Software	Acrobat Distiller 4.0 for Windows
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Document Title	20

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, contact 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
WARNING
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 supplied 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 diagnose 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
81
When you have finished self-check, inspect each part of the radar according to
Tab.7-1.
Tab. 7-1 Troubleshooting
Symptom
Cause
(1) Radar cannot be powered Power cable is disconnected.
on.
Power supply voltage is off
specified value
Fuse in power cable is blown.
(2) Nothing is displayed al- Brightness or contrast are imthough radar is powered on.
properly adjustment.
LCD is faulty.
(3) Screen is dark.
Brightness is improperly adjusted.
Backlight is faulty.
(4) Video does not appear al- Interconnecting cable is out of
though characters are displayed. place.
(5) Echo image on screen differs Ship’s heading is incorrectly set.
from actual image.
Timing adjustment is incorrectly
set.
(6) Echo images are blurred.
GAIN, STC, or FTC is improperly set.
Magnetron has degraded.
(7) Too much noise.
Radar is not tuned correctly
Panel keys are not contacting.
Use Specified power supply.
(See Section 3.2)
Replace fuse. (See Chapter 6)
Use BRIL key to adjust. (See
Section 5.3.)
Contact your dealer.
Use BRIL key to adjust. (See
Section 5.3.
Contact your dealer.
Connect interconnecting cable
correctly.
Set ship’s heading correctly.
(See Section 5.5.4.5.4)
Set timing adjustment correctly.
(See Section 5.5.4.5.4)
Adjust. (See Section 5.3.6 to
5.3.8.)
Contact your dealer.
Adjust TUNE. (See Section
5.5.3.4)
Connect grounding wire. (See
Section 3.4 to 3.6.)
Contact your dealer.
Power supply circuit is faulty.
Contact your dealer.
Radar is not grounded to earth.
(8) Not responded when key is
pressed.
Corrective action
Connect power cable correctly.
82

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