Koden MDC-5000 Series User manual

MDC-5000/5200/5500/7000(P)/7900(P) Series Revision History
0093855002-00 i
MDC-5000/5200/5500/7000(P)/7900(P) Series Service Manual
Doc No: 0093855002
Document Revision History
No.
Doc. No./Rev. No.
Revised Date
(Y/M/D)
Revised content
0
0093855002-00
2018/05/31
First edition
1
2
3
4
5
6
7
8
9
10
Document No. Revised Version Norm
When part of the document needs to be revised, the document has advanced revision number.
The document No. is indicated at the lower right side on the cover and at the left or right side of the
footer region of each page.
© 2018 Koden Electronics Co., Ltd. All rights reserved.
No part of this publication may be reproduced, transmitted, translated in any from by any means without
the written permission of Koden Electronics Co., Ltd. The technical descriptions contained in this
publication are subject to change without notice. Koden assumes no responsibility for any errors,
incidentals or consequential damages caused by misinterpretation of the descriptions contained in this
publication.

Important Notice MDC-5000/5200/5500/7000(P)/7900(P) Series
ii 0093855002-00
Important Notice
For copy and transcription of this Service Manual (hereinafter referred to as this manual),
permission from Koden is needed. Koden prohibits the un-authorized copy and transcription of this
manual.
If this manual is lost or damaged, consult a dealer of Koden or Koden.
The specification of the products and the contents in this manual are subject to change without
notice.
The contents displayed on the menu of product may be different from the expression of this
manual. The fonts and shapes of the keys and menus in the illustration may differ from the actual
ones, and some parts may be omitted.
Koden is not liable for damages and troubles arisen from misunderstanding of the contents in this
manual.
Koden is not liable for any damages caused by earthquake, lightning, wind and flood damage and
fire for which Koden is not responsible, and actions by third parties, other accidents, customer’s
unintended error/abuse and the use under other abnormal conditions.
Koden is not liable for damages of accompaniment (change/loss of memorized content, loss of
business profit, stop of business) arisen from use or failure of our products.
If the stored data are changed or lost, irrespective of causes of troubles and damages, Koden is
not liable for them.
Koden is not liable for any damages arisen from malfunction caused by combination of software
and connected equipment in which Koden is not engaged.

MDC-5000/5200/5500/7000(P)/7900(P) Series For Your Safe Operation
0093855002-00 iii
For Your Safe Operation
Symbols used in this Service Manual
This manual uses the following symbols. Understand the meaning of each symbol and implement the
maintenance and inspection.
Symbol
Meaning
Mark for warning
This symbol denotes that there is a risk of death or serious injury when
not dealing with it correctly.
Mark for danger high voltage
This symbol denotes that there is a risk of death or serious injury caused
by electric shock when not dealing with it correctly.
Mark for caution
This symbol denotes that there is a risk of slight injury or damage of
device when not dealing with it correctly.
Mark for prohibition
This symbol denotes prohibition of the specified conduct. Description of
the prohibition is displayed near the mark.
IMPORTANT
Mark for important matters
This mark denotes that there is a possibility that data loss may interfere
the operation or that the expected result may not be obtained when the
radar is not dealt correctly.
Mark for reference
This mark shows the part to be referred to concerning this description.

For Your Safe Operation MDC-5000/5200/5500/7000(P)/7900(P) Series
iv 0093855002-00
Caution Item on Equipment
Caution on a high voltage inside.
Ahigh voltage, which may risk your life, is used. This high voltage remains
in the circuit after you have powered off switch. To prevent touching the
high voltage circuit inadvertently, the protective cover is provided to the
high voltage circuit and the high voltage caution label is affixed. Ensure to
power off switch for your safety and discharge the electricity remaining in
the capacitor before starting to check. An engineer authorized by our
company should inspect and maintain the circuit.
Be sure to switch off the power in the boat.
If the power switch is inadvertently powered on during work, you will be
electrified. To prevent such accident from occurring, ensure to switch off
the power in the boat and the power of equipment. Furthermore, it is safer
to hang the caution tag with description of [Under Work] near the power
switch of equipment.
Caution on dust
Inhaling dust may cause respiratory disease. When cleaning the inside of
equipment, be careful not to inhale dust. Wearing a safety mask is
recommended.
Caution on location of equipment
Do not install the equipment where it is excessively damp and suffers from
excessive water drops.
Caution on static electricity
The static electricity may be generated from the carpet on the floor in the
cabin or clothes made of synthetic fiber. The static electricity may destroy
the electronic parts on the circuit board. Handle the circuit board, taking
the suitable anti-static measures.
Prohibited matter
Any Display and Scanner unit combination other than specified in the
manual is prohibited and will void manufacturer’s warranty.

MDC-5000/5200/5500/7000(P)/7900(P) Series For Your Safe Operation
0093855002-00 v
Caution Items on Handling
Caution on the rotating aerial
The radar antenna may start to rotate without notice. Please stand clear from
the antenna for your safety.
Caution on electromagnetic disturbance
The operating Antenna & Scanner unit radiates high-energy electromagnetic
wave. It may cause harmful effect for human body due to its continuous
radiation. As International regulation says, electromagnetic waves less than
100 watt/m2does not have a harmful effect on human bodies, but some kind of
medical devices such as heart pacemakers are sensitive even under the low
energy electromagnetic wave. Any personnel with such a device should keep
away from the electromagnetic wave generating position at all times.
Specified power density and distance from the radar (in accordance with the
provision as specified in IEC 60945)
Model name
Transmission power /
Antenna length
100W/m2
50W/m2
10W/m2
MDC-5004
MDC-5204/5240
MDC-5504/5540
4kW / 3 feet Antenna
0.9 m
1.3 m
2.8 m
4kW / 4 feet Antenna
1.0 m
1.4 m
3.1 m
4kW / 6 feet Antenna
1.2 m
1.7 m
3.7 m
MDC-5006/5060
MDC-5206/5260
MDC-5506/5560
MDC-7006/7060
MDC-7906/7960
6kW / 4 feet Antenna
1.5 m
2.1 m
4.5 m
6kW / 6 feet Antenna
1.7 m
2.4 m
5.4 m
MDC-5012/5010
MDC-5212/5210
MDC-5512/5510
MDC-7012/7010
MDC-7912/7910
MDC-7012P
MDC-7912P
12kW / 4 feet Antenna
2.1 m
2.9 m
6.4 m
12kW / 6 feet Antenna
2.4 m
3.4 m
7.6 m
12kW / 9 feet Antenna
2.9 m
4.1 m
9.0 m
MDC-5025/5020
MDC-5225/5220
MDC-5525/5520
MDC-7025/7020
MDC-7925/7920
MDC-7025P
MDC-7925P
25kW / 4 feet Antenna
2.9 m
4.1 m
9.2 m
25kW / 6 feet Antenna
3.5 m
4.9 m
10.9 m
25kW / 9 feet Antenna
4.1 m
5.8 m
13.0 m
Caution

For Your Safe Operation MDC-5000/5200/5500/7000(P)/7900(P) Series
vi 0093855002-00
Do not disassemble or modify. It may lead to trouble, fire, smoking or
electric shock. In case of trouble, contact our dealer or our company.
In case of smoke or fire, switch off the power in the boat and the power of
equipment. It may cause fire, electric shock or damage.
Caution on the remaining high voltage.
A high voltage may remain in the capacitor for several minutes after you
have powered off. Before inspecting inside, wait at least 5 minutes after
powering off or discharging the remaining electricity in an appropriate
manner. Then, start the work.
The information displayed in this unit is not provided directly for your
navigation. For your navigation, be sure to see the specified material.
Use the specified fuse. If un-specified fuse is used, it may cause a fire,
smoke or damage.

MDC-5000/5200/5500/7000(P)/7900(P) Series Break in procedure of stored radar
0093855002-00 vii
Break in procedure of stored radar
Following procedure is recommended for “Break In” of the stored radar.
Otherwise the radar sometimes exhibits unstable transmitting operation
such as arcing at its initial operation after long period of storage and make
the operation more difficult.
1. Extend preheat time as long as possible (preferably 20 to 30
minutes).
2. Set the pulse width to the shortest one and start the operation.
When the operation in the shortest pulse is stable then go to
operation in longer pulse and repeat the similar step until the
operation reaches to the final pulse condition.

Disposal of used cell and this radar MDC-5000/5200/5500/7000(P)/7900(P) Serie
viii 0093855002-00
Disposal of used cells and this radar
Treatment of the used lithium ion cells
To dispose built-in lithium ion battery cells (CR2032) in this radar, insulate each terminal with scotch
tape, etc. and wrap in a plastic bag, etc.
The disposal and collection rules may be different depending on each municipal district. Obey the
directions of each district.
Disposal of this radar
This radar shall be disposed according to the municipal regulations or rules.
A high-energy density lithium ion battery cell is built in this radar.
Improper disposal of the lithium ion battery cell is discouraged as the cell
has possibility of short-circuiting. If it gets wet, generation of heat,
explosion or ignition may occur resulting in injury or fire.

MDC-5000/5200/5500/7000(P)/7900(P) Series Contents
0093855002-00 ix
Contents
Document Revision History........................................................................................................i
Important Notice........................................................................................................................ii
For Your Safe Operation..........................................................................................................iii
Break in procedure of stored radar......................................................................................... vii
Disposal of used cells and this radar..................................................................................... viii
Contents ..................................................................................................................................ix
Chapter 1 Fault diagnosis..................................................................................................... 1-1
1.1 About alarms............................................................................................................. 1-1
1.2 Malfunction detection step........................................................................................ 1-2
1.3 Malfunction diagnosis flowchart................................................................................ 1-3
1.3.1 Initial malfunction diagnosis 1.........................................................................1-3
1.3.2 Initial malfunction diagnosis 2 ...................................................................... 1-4
1.3.3 Other faults (Display unit)............................................................................. 1-5
1.3.4 Abnormal display.......................................................................................... 1-6
1.3.5 No response from the Antenna Scanner unit ...............................................1-7
1.3.6 Sensitivity failure........................................................................................... 1-8
1.3.7 No display of ship’s bearing, speed and latitude/longitude .......................... 1-9
1.3.8 Operation unit abnormality ......................................................................... 1-10
1.3.9 Antenna Scanner unit abnormality............................................................. 1-11
1.3.10 Synchronization of screen abnormality ....................................................1-12
1.3.11 High voltage abnormality..........................................................................1-12
1.3.12 Pulse length control failure.......................................................................1-13
1.3.13 Rotary abnormality ................................................................................... 1-14
1.3.14 Heading line and Azimuth abnormality.....................................................1-15
1.3.15 TT (ATA) abnormality................................................................................1-16
1.3.16 Chart display abnormality.........................................................................1-17
1.3.17 No display of AIS......................................................................................1-18
1.3.18 Other faults (Antenna Scanner unit).........................................................1-20
1.4 Failure criterion of microwave components ............................................................ 1-24
1.4.1 Magnetron .................................................................................................. 1-24
1.4.2 Front-end module.......................................................................................1-24
1.4.3 Limiter.........................................................................................................1-24

Contents MDC-5000/5200/5500/7000(P)/7900(P) Series
x 0093855002-00
Chapter 2 MAINTENANCE MENU........................................................................................2-1
2.1 BITE...........................................................................................................................2-1
2.1.1 PANEL TEST ................................................................................................2-1
2.1.2 DIAGNOSE TT..............................................................................................2-1
2.1.3 DIAGNOSE AIS ............................................................................................2-2
2.1.4 SERIAL MONITOR .......................................................................................2-3
2.1.5 ANT MONITOR.............................................................................................2-4
2.1.6 SD CARD......................................................................................................2-4
2.2 ECHO........................................................................................................................2-5
2.2.1 GAIN OFFSET..............................................................................................2-5
2.2.2 SEA CURVE .................................................................................................2-5
Chapter 3 How to exchange components.............................................................................3-1
3.1 Display unit................................................................................................................3-1
3.1.1 Replacement of fuse.....................................................................................3-1
3.1.2 Dismantling of bracket and rear case (MRD-108 / MRD-108P)...................3-2
3.1.3 Dismantling of bracket and rear case (MRD-109)........................................3-3
3.1.4 Dismantling of bracket and rear case (MRD-111).........................................3-4
3.1.5 Exchange of Logic PCB (MRD-108/108P/109/111/MRM-108/108P/110).....3-5
3.1.6 Exchange of power supply PCB (MRD-108/108P/109/111,
MRM-108/108P/110) ................................................................................................3-6
3.1.7 Exchange of LCD unit (MRD-108/108P) ......................................................3-9
3.1.8 Exchange of LCD unit (MRD-109)..............................................................3-11
3.1.9 Exchange of LCD unit (MRD-111)..............................................................3-13
3.1.10 Exchange of backlight power PCB (MRD-108/108P)...............................3-15
3.1.11 Exchange of Rear card connector PCB
(MRD-108/108P/MRM-108/108P/110) ...................................................................3-17
3.1.12 Exchange of Connector PCB (MRD-109).................................................3-18
3.1.13 Exchange of Connector PCB (MRD-111) .................................................3-19
3.2 Operation unit..........................................................................................................3-20
3.2.1 Exchange of Panel PCB (MRO-108/108P).................................................3-20
3.2.2 Exchange of Panel PCB (MRD-111)...........................................................3-23
3.2.3 Exchange of track ball (MRO-108/108P)....................................................3-24
3.2.4 Exchange of Sillcon key (MRD-111)...........................................................3-26
3.3 Antenna Scanner unit..............................................................................................3-27

MDC-5000/5200/5500/7000(P)/7900(P) Series Contents
0093855002-00 xi
3.3.1 Dismantling of antenna and antenna cover................................................3-27
3.3.2 Exchange of Azimuth Pulse unit and Drive unit motor (RB806 / 807 / 717A /
718A / 719A) ..........................................................................................................3-29
3.3.3 Exchange of V ring.....................................................................................3-31
3.3.4 Exchange of Modulator PCB......................................................................3-36
3.3.5 Exchange of Fan (RB809 only)..................................................................3-39
3.3.6 Exchange of Fan (RB719A only)...................................................................3-40
3.3.7 Exchange of Magnetron (RB806)...............................................................3-41
3.3.8 Exchange of Magnetron (RB807,RB808/808P) .........................................3-43
3.3.9 Exchange of Magnetron (RB809/809P) .....................................................3-45
3.3.10 Exchange of Magnetron (RB717A, RB718A) ............................................. 3-47
3.3.11 Exchange of Magnetron (RB719A)...........................................................3-49
3.3.12 Exchange of Transformer (RB809/809P).................................................3-51
3.3.13 Exchange of Transformer (RB717A, RB718A) ...........................................3-53
3.3.14 Exchange of Transformer (RB719A)........................................................3-54
3.3.15 Exchange of MIC (RB806) .......................................................................3-56
3.3.16 Exchange of IF MODULE (RB807/808/808P/809/809P) .........................3-57
3.3.17 Exchange of IF PCB, MIC and limiter device..............................................3-58
Chapter 4 Spare parts and Circuit diagram .......................................................................... 4-1
4.1 Spare parts................................................................................................................ 4-1
4.2 Circuit diagram........................................................................................................ 4-34
4.2.1 Interconnection diagam of 4kW Scanner Unit (RB806)................................4-35
4.2.2 Interconnection diagam of 4 kW Scanner Unit (RB716A).............................4-36
4.2.3 Interconnection diagam of 6 kW Scanner Unit (RB807)...............................4-37
4.2.4 Interconnection diagam of 6 kW/12 kW Scanner Unit (RB717A/718A)........4-38
4.2.5 Interconnection diagam of 12 kW Scanner Unit (RB808).............................4-39
4.2.6 Interconnection diagam of 12 kW Scanner Unit (RB808P)........................... 4-40
4.2.7 Interconnection diagam of 25 kW Scanner Unit (RB809).............................4-41
4.2.8 Interconnection diagam of 25 kW Scanner Unit (RB809P)...........................4-42
4.2.9 Interconnection diagram of 25 kW Scanner Unit (RB719A).......................4-43
4.2.10 Inter connection diagram MRD-108/MRD-108P ......................................4-44
4.2.11 Inter connection diagram MRM-108/MRM-108P......................................4-45
4.2.12 Inter connection diagram MRD-111..........................................................4-46
4.2.13 Inter connection diagram MRD-109 .........................................................4-47

Contents MDC-5000/5200/5500/7000(P)/7900(P) Series
xii 0093855002-00
4.2.14 Inter connection diagram MRM-110..........................................................4-48
4.2.15 Circuit diagram Power supply PCB ..........................................................4-49
4.2.16 Circuit diagram of BACK LIGHT POWER PCB........................................4-51
4.2.17 Circuit diagram of PANEL BOARD (E63-900*).........................................4-52
4.2.18 Circuit diagram of PANEL BOARD (E68-900*).........................................4-53
4.2.19 Circuit diagram of PANEL BOARD (E73-900*).........................................4-54
4.2.20 Circuit diagram of CONNECTOR PCB (E63-911*)...................................4-55
4.2.21 Circuit diagram of CONNECTOR PCB (E68-910*) ..................................4-56
Annex ....................................................................................................................................A-1
A.1 Clean up the trackball ..................................................................................................A-1
A.2 Interface .......................................................................................................................A-3
1. Relation between functions and input signal........................................................A-3
2. Kind of input/output ports .....................................................................................A-4
3. Setup Interface.....................................................................................................A-5
4. Confirmation of input signal................................................................................A-11
5. Connection of gyro convertor S2N.....................................................................A-12
6. Gyro/Log interface: Connection of ADPC-101 unit (non-IMO)...........................A-14
7. Connection of LOG pulse NMEA converter L1N (200 pulse/nautical mile only)A-16
8. Connection of AIS...............................................................................................A-17
A.3 System Program ........................................................................................................A-19
Version confirmation...............................................................................................A-19
How to update the system program .......................................................................A-20

MDC-5000/5200/5500/7000(P)/7900(P) Series Chapter 1 Fault diagnosis
0093855002-00 1-1
●ALARM A 9999999
UTC 20/05/15 12:34
DGPS XXXX 999999
MESSAGE. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . .
(ALARM and WARNING blinks until acknowledging alarm)
Date when warning and alarm
is generated.
Error message
Error device ID
Instance number
Alarm ID
Category
Icon and Priority:
ALARM / WARNING / CAUTION
Chapter 1 Fault diagnosis
1.1 About alarms
Alarm and warning display may appear at the lower right of the radar screen as shown in the following
figure, when a malfunction or operation error has been detected in the device.
In case of occurrence of multiple numbers of alarms, it is possible to confirm all of them in [LIST].
Alarms occurred since Power ON can be confirmed by [HISTORY LIST]. (MDC-7000/7900 series only)
Refer to “Chapter 3 Alarm” in the Operation manual for the [LIST] and [HISTORY LIST].
Refer to “Chapter 1 Display and Operation 1.1 Radar Display [Alarm display area]” in the
Opearation manual.

Chapter 1 Fault diagnosis MDC-5000/5200/5500/7000(P)/7900(P) Series
1-2 0093855002-00
1.2 Malfunction detection step
As a first step of on-board repair, refer to the following tables describing outlines of malfunction
diagnostics procedure.
Table 1.1 basic malfunctions
Failure status
Possible cause
Measure
No power.
1. Power cable is disconnected.
2. Operation unit cable is
disconnected.
3. Supply voltage is out of range.
4. Main power fuse is blown.
1. Connect power cable firmly
and secure connector.
2. Connect operation cable
firmly and secure connector.
3. Use proper power source.
4. Change fuse with new one.
Power is applied but no
display
1. Display brilliance is adjusted to the
minimum.
2. Connector of internal cable is
disconnected.
3. Failure of LCD unit or Backlight
power PCB
1. Adjust properly.
2. Confirm by a serviceman.
3. Request repair.
Table 1.2 possible malfunctions
Error status
Possible cause
Measure
Display brilliance is
dark.
1. Adjustment of display brilliance is
incorrect.
2. Failure of LCD driver circuit
3. Failure of Backlight power PCB
1. Adjust properly.
2. Request repair
3. Request repair
No radar echo is
displayed.
1. Receiver is detuned.
2. Video contrast adjustment error
3. Failure of transceiver
1. Readjust by referring to “Tune
adjustment of Installation
manual”.
2. Readjust by GAIN, SEA or
RAIN knobs, or readjust by
referring to “Tune adjustment
of Installation manual”.
3. Request repair
Radar echo is too weak.
1. Receiver is detuned.
2. Failure of Magnetron or MIC
(front-end)
1. Readjust by referring to “Tune
adjustment of Installation
manual”.
2. Request repair
Error message “Head
line signal abnormal.” is
displayed.
1. No heading line signal input.
1. Check [BP/HG] signal between
an Antenna Scanner unit and a
Display unit.
Antenna does not
rotate.
1. Motor fuse is blown.
2. Motor power is not supplied.
3. Inter-switch mode is difference.
1. Replace fuse with a new one.
2. Check motor power
connection.
3. Set inter-switch mode to
master mode.

MDC-5000/5200/5500/7000(P)/7900(P) Series Chapter 1 Fault diagnosis
0093855002-00 1-3
Does a short beep buzzer?
Start
Turn the radar system on
Yes
After countdown, it
transmits on
When MAN GAIN is
maximized and MAN SEA
is minimized, is the radar
image displayed?
No
Go to
[1.3.5 No response from
the Antenna Scanner
unit] in page 1-7
Go to
[1.3.4 Abnormal display] in
page 1-6
Go to
[1.3.2 Initial malfunction
diagnosis 2] in page 1-4
Is the "KODEN MARINE
RADAR" normally
displayed momentarily?
Is the system name
displayed like
"MDC-5206"?
Was "NOT
CONNECTED"
displayed?
The inter switch function
is correctly set. Refer to
Chapter 2 “Inter-switch”
of Operation manual.
Go to
[3.1.5 Exchange of Logic
PCB] in page 3-5
Is the sensitivity normal?
Go to
[1.3.6 Sensitivity failure]
in page 1-8
Is the power lamp
lighted?
Go to
[1.3.8 Operation unit
abnormality] in page 1-10
Is the screen
brightness normal?
The brilliance key is
pushed, and the EBL
switch is turned
clockwise, and
brightness is maximized.
Can key or knob be
operated normally?
Go to
[1.3.8 Operation unit
abnormality] in page 1-10
When MENU> ALARM>
HISTORY LIST is
displayed, is the Alarm
message displayed?
Confirm the Alarm display list.
Refer to [5.2.1.1 Alarm display
list] of Installation manual.
Go to
[1.3.3 Other faults]
in page 1-5
No
Yes
No
Yes
Yes
No
No
Yes
No
Yes
Yes
No
No
Yes
Yes
No
No
Yes
1.3 Malfunction diagnosis flowchart
1.3.1 Initial malfunction diagnosis 1

Chapter 1 Fault diagnosis MDC-5000/5200/5500/7000(P)/7900(P) Series
1-4 0093855002-00
Go to
[3.2.1, 2 Exchange of
Panel PCB] in page 3-20,
3-23
Is the main power fuse (F1)
not blowout?
Is the fuse of a correct
standard used?
Go to
[3.1.1 Replacement of
fuse] in page 3-1
Is inboard power polarity
correctly?
Reconnect correctly
Is the power supply voltage
within normal range?
21.6-41.6 VDC
Fix the inboard power
supply voltage in a
normal range.
Is +12V (between main
logic PCB J711-11 and
GND) normal?
Is voltage between
[J722-4] and [J722-1]
9.5V+/-0.5V?
Connect connectors
correctly.
Go to
[3.1.6 Exchange of power
supply PCB] in page 3-6
Yes
No
Yes
Is the Operation unit
connector connected to the
Display unit correctly?
Connect connectors
correctly
Yes
No
Go to
[3.1.6 Exchange of power
supply PCB] in page 3-6
Is voltage between [J722-4]
and [J722-1] about 0V at
power on?
Is the following connectors
connected correctly?
Connectors of J710 (main
logic PCB) and J602 (power
supply PCB).
3.1.5 ロジック基板交換 11
項参照
Connect connectors
correctly.
Is a connector of P722
connected correctly?
Connect connectors
correctly.
Go to
[3.1.6 Exchange of power
supply PCB] in page 3-6
Take off rear case from a
LCD case.
Refer to page 3-2 to 3-4.
Is a connector of P722
connected correctly?
Go to
[3.1.6 Exchange of power
supply PCB] in page 3-6
Yes
No
No
Yes
No
No
No
Yes
Yes
Yes
No
No
Yes
No
Yes
No
Yes
(blowout)
(not blowout)
Is +12V (between main
logic PCB J710-23 and
GND) normal?
No
Go to
[3.1.5 Exchange of Logic
PCB] in page 3-5
Yes
1.3.2 Initial malfunction diagnosis 2

MDC-5000/5200/5500/7000(P)/7900(P) Series Chapter 1 Fault diagnosis
0093855002-00 1-5
1.3.3 Other faults (Display unit)
Other faults
Go to
[Exchange of LCD unit]
in page 3-9, 3-11, 3-13
Is the TT (ATA)
function normal?
Is the AIS function
normal?
Is the MAP function
normal?
Is the screen display
normal?
Does the sweep rotate
normally?
Go to
[1.3.13 Rotary
abnormality]
in page 1-14
END
Yes
No
Go to
[1.3.15 TT (ATA)
abnormality]
in page 1-16
Go to
[1.3.17 No display of AIS]
in page 1-18
Go to
[1.3.16 Chart display
abnormality]
in page 1-17
Is there a part displayed
in white or black on the
screen because any
signal is not displayed?
Is there a part not
normally displayed on
the screen?
After "ALL RESET" did
it become normal?
Go to
[3.1.5 Exchange of
Logic PCB]
in page 3-5
After reset, did the
function become
normal?
Please inquire to a
Koden electronics
Co.,Ltd.
Yes
No
No
Yes
Yes
No
No
No
No
No
Yes
Yes
Yes
Yes

Chapter 1 Fault diagnosis MDC-5000/5200/5500/7000(P)/7900(P) Series
1-6 0093855002-00
Is +12V+/-1V normal?
MDC-5200/5500: between
Logic PCB J729-1 and -3
MDC-7900: between
E63-6100 Back Light
Power PCB J613-1 and -5
Go to
[3.1.9 Exchange of LCD
unit] in page 3-13
Is backlighting of the
LCD display lit?
Is the connection of
LCD module "CN1"
and logic board "J704"
normal?
Has three of LED display
on the main logic PCB
status blinked?
Go to
[3.1.7-9 Exchange of LCD
unit] in page 3-9, 3-11, 3-13
Go to
[3.1.5 Exchange of Logic
PCB] in page 3-5
Reconnect correctly.
MDC-5200: LED Driver
voltage(+18V+/-3V) normal?
(between LED Driver PCB
J802-1 and -2)
Exchange of LED Driver
PCB. Refer to [3.1.8
Exchange of LCD] in page
3-11
Take off rear case from a
LCD case.
Refer to [3.1.2, 3
Dismantling of bracket and
rear case]
Is ENABLE signal (+3.3V)
normal?
(between Logic PCB J721-2
and -1)
Is the screen
synchronization normal?
Go to
[1.3.10 Synchronization of
screen abnormality]
in page 1-12
LCD completely blank or it
doesn't display
Is screen brilliance control
of display to the maximum?
Yes
Display brilliance is set in
the maximum.
No
Yes
Yes
No
No
No
No
No
Yes
Yes
Yes
Yes
No
MDC-5200/5500: Go to
[3.1.5 Exchange of Logic
PCB] in page 3-5
MDC-7900: Exchange of
Back light power PCB.
Refer to [3.1.7 Exchange
of LCD] in page 3-9
No
Go to
[3.1.5 Exchange of Logic
PCB] in page 3-5
Yes
1.3.4 Abnormal display