Koden Electronics RB717A, RB718A User Manual
CHAPTER 6. MAINTENANCE AND INSPECTION
A qualified engineer should carry out most of maintenance work on this radar. If your radar set has
any problem, contact your local dealer for repair.
Very High Voltage is present inside the radar set. Do
not attempt to open the display rear cover or disassemble internal module. When you open the radome, make sure to turn off the main power supply
at switch board.
Even if the radar is switched OFF, the radar set is
still powered with very small amount of current.
The following table shows the maintenance by user. Please check each item periodically.
Tab. 6-1 Maintenance
Inspection Interval Inspection Item Method of Inspection and Maintenance
3-6 months Rust and looseness in
scanner unit
Display screen of LCD
display
6-12 months Grease application to
antenna drive gear
Check for contact of
connectors
Antenna motor
brush(RA52/53/54)
Articles of consumption
The radar uses the life-limited parts as listed below that require periodic replacement.
(1) Magnetron
This part is used in the scanner unit. If distant echo images have become weak, the
magnetron probably may have degraded. In such a case, you need to replace this item.
Consult your local service agent for replacement.
Practical life to replacement: 3000hour(typ.) (500hour guaranteed by the magnetron
manufacturer)
(2) LCD back-light
This part used in the display unit. If the display screen is extremely dark and its illumination cannot be corrected by adjusting the screen brightness, the LCD backlighting lamp
may be faulty or may have burnt out. In such a case, you need to replace it. Consult your
local agent for replacement.
Period of the replacement: 15000 hours (typ.) (1000 hours at 0°C)
!
WARNING
Check if the scanner’s fitting bolts are corroded.
Clean the filter plate and LCD screen surfaces with a soft
and wet cloth. Avoid organic solvent.
Apply an even coating of grease* to the entire surface of
the antenna drive gear with a spatula or brush.
Check whether connectors are properly connected. If not,
redo connection or make good contact by using a contact
restoring chemical agent or by polishing or replace with a
new one if necessary.
Check the length of brushes. If the length is less than
6mm, replace both brushes with new one.
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A
(3) Fuse
The fuse is in-line type, built in
to the power supply cable. If the fuse
appears to be blown, check the fuse. If
To display unit
Power supply cable
Push
blown, replace it following the
procedure shown in Fig.6-2.
Wire(White)
Turn counterclockwise
and pull
Spring
Fuse
Push and turn clockwise
Replace new fuse
Fig. 6-2 Method for replacing fuse
Note: Before maintenance of scanner, you can hang a radome (upper) using cord through hole as fol-
lows.
Cord
A: Top view
Radome(bottom)
Hole
Cord
Fixing screw
Radome(Upper)
Fig. 6-3 Method for replacing fuse
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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.
If there is any trouble, press and hold the POWER key for 3 seconds to power off. Then turn on the
equipment again and wait 10 sec at least.
If you find the radar is faulty, check it by 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 RA53 or RA54.)
(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 if power switch is OFF, this radar is still supplied with 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.
!
WARNING
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7.2 Inspecting Each Part
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 outside
of 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 although radar is powered on.
Brightness is improperly adjusted.
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 although characters are displayed.
(5) Echo image on screen differs
from actual image.
Timing adjustment is incorrectly
(6) Echo images are blurred. GAIN, STC, or FTC is improp-
Interconnecting cable is out of
place.
Connect interconnecting cable
correctly.
Ship’s heading is incorrectly set. Set ship’s heading correctly.
(See Section 5.5.4.5.4)
Set timing adjustment correctly.
set.
(See Section 5.5.4.5.4)
Adjust. (See Section 5.3.6 to
erly set.
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 set is not grounded to
earth.
Connect grounding wire. (See
Section 3.4 to 3.6.)
(8) No response to key pressing. Panel keys are not in contact. Contact your dealer.
Power supply circuit is faulty. Contact your dealer.
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