Oki C9500dxn User manual

41956001TH Rev.1 1 / 220
Oki Data CONFIDENTIAL
C9500 /C9300
Color LED Page Printer
MAINTENANCE
MANUAL
ODA/OEL/INT
2002-10-23 Rev.1

41956001TH Rev.1 2 /
Oki Data CONFIDENTIAL
1 2002-10-23
Rev.No. Date No.
Corrected items
Page Description of change Person in
change
Document Revision History

41956001TH Rev.1 3 /
Oki Data CONFIDENTIAL
PREFACE
Thismaintenancemanualprovidesproceduresandtechniquesforthetroubleshooting,maintenance,and
repair of C9500/C9300.
This manual is written for maintenance personnel, but it should always be accompanied with the C9500/
C9300 User’s Manual for procedures for handling and operating C9500/C9300. For repairing each
component of C9500/C9300, see the Troubleshooting manual.
[Notices]
The contents of this manual are subject to change without prior notice.
Althoughreasonableeffortshavebeentakeninthepreparationofthismanualtoassureitsaccuracy,this
manual may still contain some errors and omissions. OKI will not be liable for any damage caused or
alleged to be caused, by the customer or any other person using this maintenance manual to repair,
modify, or alter C9500/C9300 in any manner.
[Warning]
Many parts of C9500/C9300 are very sensitive and can be easily damaged by improper servicing. We
strongly suggest that C9500/C9300 be serviced by OKI’s authorized technical service engineers.

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Oki Data CONFIDENTIAL
CONTENTS
1. SPECIFICATIONS ............................................................................................ 7
1.1 Basic System Configuration............................................................................................. 7
1.2 Printer Engine Specifications ........................................................................................... 8
1.3 Option Configuration ........................................................................................................ 9
1.4 Specifications................................................................................................................. 11
2. OPERATION DESCRIPTION ......................................................................... 12
2.1 Main Control Board (TIG-PWB) ..................................................................................... 16
2.2 Engine Control Board (K7N PWB) ................................................................................. 18
2.3 Power Units.................................................................................................................... 19
2.4 Mechanical Processes ................................................................................................... 20
2.4.1 Electrophotographic process............................................................................ 21
2.4.2 Paper running process ..................................................................................... 25
2.5 Sensor............................................................................................................................ 34
2.5.1 Paper related sensors ...................................................................................... 34
2.5.2 Other sensors................................................................................................... 35
2.6 Color Misalignment Correction....................................................................................... 36
2.7 Transfer Control Responds to Environmental Changes
(Room Temperatures and Relative Humidities)............................................................. 36
2.8 Paper Jam Detection ..................................................................................................... 37
2.9 Cover Opening............................................................................................................... 38
2.10 Toner Low Detection...................................................................................................... 39
2.11 Paper Size Detection ..................................................................................................... 41
2.12 Operation at Power-on................................................................................................... 42
2.12.1 Self-diagnostic test ........................................................................................... 42
2.13 Color Misalignment Detection ........................................................................................ 43
2.14 Version Read of Units Replaced Periodically ................................................................ 44
2.15 Life Count for Units Replaced Periodically..................................................................... 44
2.16 Toner Consumption Detection ....................................................................................... 44
3. PARTS REPLACEMENT................................................................................ 45
3.1 Precautions in Replacing Parts...................................................................................... 45
3.2 Parts Layout................................................................................................................... 47
3.3 Replacing Parts..............................................................................................................54
3.3.1 Top cover.......................................................................................................... 55
3.3.2 LED Head / LED Assy Spring........................................................................... 56
3.3.3 Top Cover Unit ................................................................................................. 57
3.3.4 Control Panel Assy / Control Panel Bezel / LED Control PWB / Toner Sensor /
Stack Full Sensor / Control Panel / Control Panel Tape Harness / Eject Roller58
3.3.5 Top Cover Handle / Top Cover Latch / Top Cover Latch Spring...................... 59
3.3.6 Eject Guide Assy .............................................................................................. 60
3.3.7 Cassette Assy / Cover-Blind / Side Cover Assy ............................................... 61
3.3.8 Feed Roller ....................................................................................................... 62
3.3.9 Left Side Cover................................................................................................. 63
3.3.10 Face Up Tray.................................................................................................... 64
3.3.11 Front Cover....................................................................................................... 65
3.3.12 Rear Cover ....................................................................................................... 66
3.3.13 Multipurpose Tray Assy / Multipurpose Tray Cover Assy / Link /
Multipurpose Tray Top Cover / Multipurpose Tray Drive Gear / OHP Sensor.. 67
3.3.14 Drum Contact Assy........................................................................................... 69
3.3.15 Media Thickness Sensor Assy......................................................................... 70
3.3.16 Registration Roller Assy (A) / Registration Drive Gear (A)............................... 71

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Oki Data CONFIDENTIAL
3.3.17 Registration Roller Assy (B) ............................................................................. 72
3.3.18 Registration Clutch / Registration Motor Assy .................................................. 73
3.3.19 ID Cooling Fan.................................................................................................. 74
3.3.20 Color Registration Sensor Assy........................................................................ 75
3.3.21 Duplex Guide Assy........................................................................................... 76
3.3.22 Electrical Chassis / Electrical Chassis Cooling Fan ......................................... 77
3.3.23 Print Engine Controller PWB ............................................................................ 78
3.3.24 Printer Unit Chassis.......................................................................................... 79
3.3.25 Entrance Cassette Sensor Actuator ................................................................. 80
3.3.26 Entrance Sensor PWB (R71)............................................................................ 81
3.3.27 Entrance MT Sensor Actuator / Entrance Belt Sensor Actuator /
Entrance Waste Toner Sensor Actuator.......................................................... 82
3.3.28 Main Cooling Fan (PULL) Assy / Main Cooling Fan (PUSH) /
Fuser Eject Roller ............................................................................................. 83
3.3.29 Eject Sensor Assy ............................................................................................ 84
3.3.30 Fuser Latch Handle (L)..................................................................................... 85
3.3.31 Belt Motor Assy ................................................................................................ 86
3.3.32 Fuser Latch Handle (R) .................................................................................... 87
3.3.33 Main Motor Assy............................................................................................... 88
3.3.34 Contact Assy / Side Plate Assy ........................................................................ 89
3.3.35 Low-voltage Power Unit.................................................................................... 90
3.3.36 High-voltage Power Unit................................................................................... 91
3.3.37 Main Feeder Assy............................................................................................. 92
3.3.38 Fuser Unit ......................................................................................................... 93
3.3.39 Belt Unit ............................................................................................................ 94
3.3.40 Duplex Unit ....................................................................................................... 95
3.3.41 CU Assy............................................................................................................ 96
4. Adjustment ....................................................................................................98
4.0 System Maintenance MENU.......................................................................................... 98
4.0.1 ID Check Pattern Printing ( " TEST PRINT MENU " item )............................... 99
4.1 Maintenance Mode and Functions................................................................................. 99
4.1.1 Maintenance menu........................................................................................... 99
4.1.2 Engine maintenance mode............................................................................. 101
4.1.2.1 Operator panel ................................................................................ 101
4.1.2.2 General self-diagnostic mode (Level 1) .......................................... 101
4.1.2.2.1 Entering self-diagnostic mode (Level 1).......................... 102
4.1.2.2.2 Exiting self-diagnostic mode .......................................... 102
4.1.2.3 Switch scan test .............................................................................. 102
4.1.2.4 Motor clutch test.............................................................................. 106
4.1.2.5 Test print ......................................................................................... 109
4.1.2.6 NVM initialization............................................................................. 113
4.1.2.7 Consumable counter display........................................................... 114
4.1.2.8 Consumable counter display - continuous ...................................... 114
4.1.2.9 Error Messages and their details .................................................... 115
4.1.3 Various print jobs with single printer unit attached with a controller............... 120
4.2 Adjustments after Parts Replacement ......................................................................... 121
4.2.1 Precautions in replacing engine control board ............................................... 121
4.2.2 Precautions in replacing EEPROM................................................................. 121
4.2.3 EEPROM replacement after TIG board replacement ..................................... 122
4.2.4 Destination Setting (Checking Method: Printing Demo Page)........................ 122
4.2.5 Recovery Flash ROM data on TIG board....................................................... 123
4.3 Adjusting the Density ................................................................................................... 123
4.4 Paper Thickness Detection Sensitivity Adjustment and Media Thickness Detection
Value Check................................................................................................................. 124

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Oki Data CONFIDENTIAL
5. Regular Maintenance .................................................................................. 126
5.1 Parts Replaced Regularly ............................................................................................ 126
5.2 Cleaning....................................................................................................................... 126
5.3 Cleaning of LED Lens Array ........................................................................................ 126
5.4 Cleaning Pick-up Roller ............................................................................................... 126
6. Troubleshooting Procedures ..................................................................... 127
6.1 Precautions before troubleshooting ............................................................................. 127
6.2 Precautions before handling an abnormal image ........................................................ 127
6.3 Precautions upon handling an abnormal image........................................................... 127
6.4 Preparing for Troubleshooting ..................................................................................... 128
6.5 Troubleshooting Procedure.......................................................................................... 128
6.5.1 LCD message list ........................................................................................... 129
6.5.2 Preparing for troubleshooting ......................................................................... 135
6.5.3 Troubleshooting for abnormal images............................................................ 146
6.6 Fuse check................................................................................................................... 161
7. WIRING DIAGRAM...................................................................................... 162
7.1 Resistance Check ........................................................................................................ 162
7.2 Parts Layout on Boards ............................................................................................... 168
8. Parts List...................................................................................................... 175
APPENDIX A INTERFACE SPECIFICATIONS ................................................. 192
1. Parallel Interface Specifications........................................................................................ 192
2. Universal Serial Bus (USB) Interface Specifications......................................................... 195
APPENDIX B 2ND/3RD TRAY, HIGHT CAPACITY TRAY UNIT ..................... 196
APPENDIX C C7100/7300/9300/9500 SERIES ERROR MESSAGES ............. 206
1. C7100/7300/9300/9500 Series (Error messages) ....................................................... 206
2. C7100/7300/9300/9500 Series (Error messages : Related to Color, Media Detect) ... 213
3. C7100/7300/9300/9500 Series (Warning messages : Related to usage, media) ........ 216
4. C7100/7300/9300/9500 Series (Warning messages : Job Account) ........................... 217
5. C7100/7300/9300/9500 Series (Other Warning) ......................................................... 218

41956001TH Rev.1 7 /
Oki Data CONFIDENTIAL
MMMMMMMM
LED Head
Centronics I/F
USB I/F
2 × Option Slots
Junction Board
Pulse Motor
Engine Control
Low Voltage
Power Unit
Fuser
Unit
High Voltage
Power Unit 2nd/3rd Tray
High Capacity
Tray
Duplex
Unit
Belt
Unit
<Sensors, Switches and Thermistors>
Paper size sensor (4 bits)
Paper empty sensor
Paper near empty sensor
MT paper empty sensor
FF home switch
Loading sensor 1
Loading sensor 2
C-ID
Unit
M-ID
Unit
Y-ID
Unit K-ID
Unit
C ID M ID Y ID K IDBelt Heat MT/
Registration Hopping
Operator Panel
2 × ROM
DIMMs
3 × RAM
DIMM
IDE
I/F(HDD)
DC Fan
Note
Note Option Slot:
LAN Card made by JCI
< advanced Sensors>
Media Thickness Detection
Density Detection
Color Misalignment Detectin
1. SPECIFICATIONS
1.1 Basic System Configuration
The basic system configuration of C9500/C9300 is illustrated in Figure 1.1.
Figure 1.1

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Oki Data CONFIDENTIAL
1.2 Printer Engine Specifications
The inside of the printer is composed of the followings:
• Electrophotographic Processor
• Paper Paths
• Controller Block (CU and PU)
• Operator Panel
• Power Units (High-Voltage Unit and Low-Voltage Unit)
Figure 1-2 shows the printer configuration.
Figure 1.2

41956001TH Rev.1 9 /
Oki Data CONFIDENTIAL
1.3 Option Configuration
The followings are available as options on C9500/C9300.
(1) 2nd Tray/ 3rd Tray
Note: Don’t use one for
C9200/C9400
(2) Duplex Unit
(3) High-Capacity Tray
(4) Expansion Memory 64/128/256/512MB
(5) Internal Hard Disk
(6) Ethernet Board
Note: Don’t use one for
C9200/C9400
Note: Don’t use one for
C9200/C9400
Note: Don’t use one for
C9200/C9400
Note: Don’t use one for
C9200/C9400
Note: Don’t use one for
C9200/C9400

41956001TH Rev.1 10 /
Oki Data CONFIDENTIAL
(7) Finisher Unit
(8) Simplified Color Copy Unit * Equipped with exclusive auto feeder
(9) Dual-Purpose Finisher and Copy Unit Table, and Copy Unit Extension Rack
Color Copy Unit Extension Rack
Dual-Purpose Finisher and Copy Unit Table
(10) 2nd/3rd Tray Unit on Casters
Note: Don’t use one for
C9200/C9400

41956001TH Rev.1 11 /
Oki Data CONFIDENTIAL
1.4 Specifications
(1) External Dimensions Height: 460mm Width: 666mm Length: 626mm
(2) Weight 72 kg
(3) Paper Type: Ordinary paper and transparencies (Recommended: ML
OHP01)
Size: Postal card, Legal 13" or 14", Executive, A4, A5, B5, A6,
A3 A3-Nobi, B4
(Only the 1st tray and the front feeder support A6 and
postal card sizes.)
Weight: 1st tray 17 lb to 54 lb (64 to 203g/m2)
Multi Purpose feeder 17 lb to 54 lb (64 to 203g/ m2)
(4) Print Speed Color: 30 pages per minute
(A4 LEF) (Transparency: Pages per minute)
Monochrome: 37 pages per minute
(Transparency: Pages per minute)
Postal Card, Label, Thick Paper: 12Pages per minute
(5) Resolution 600 x 600 dots per inch ( C9300 )
1200 ×1200 dots per inch ( C9500 )
(6) Power Input 115V~127V , 220V~240V
(7) Power Consumption Peak: 1600W Normal Operation: 800W (5% duty)
Idle: 250W Power Saving Mode: 70W
(8) Frequency 50Hz or 60Hz±2Hz
(9) Noise Operating: 55 dB (without Option units)
Standby: 45 dB
Power Saving: 43 dB
(10) Consumable Life Toner Cartridge: 7,500 pages (5% duty)
Large-Capacity Toner Cartridge: 15,000 pages (5% duty)
(in each of Y, M, C and K)
Image Drum: 26,000 pages (5% duty, Continuous printing)
(in each of Y, M, C and K)
(11) Parts Replaced Periodically
Fuser Unit Assy: Every 80,000 pages
Belt Cassette Assy: Equivalent of 80,000 pages (3P/J)
Transfer Belt cartridge: 60,000 prints

41956001TH Rev.1 12 /
Oki Data CONFIDENTIAL
Temperature (ºF) RemarkTemperature (ºC)
Operating 50 to 89.6 10 to 32 17 to 27ºC (Temperatures to
assure full color print quality)
Non-Operating 32 to 109.4 0 to 43 Power-off
Storage (Max. One Year) -14 to 109.4 -10 to 43 With drum and toner
Transport (Max. One Month) -20 to 122 -29 to 50 With drum and without toner
Transport (Max. One Month) -20 to 122 -29 to 50 With drum and toner
Relative Humidity (%) Max. Wet-Bulb Temperature (ºC) Remark
Operating 20 to 80 25 50 to 70%
(Humidities to assure full color print quality)
Non-Operating 10 to 90 26.8 Power-off
Storage 10 to 90 35
Transport 10 to 90 40
(12) Temperatures and Relative Humidities
Temperature
Humidity
(13) Printer Life 1,000,000 pages (on a A4 basis) or five years

41956001TH Rev.1 13 /
Oki Data CONFIDENTIAL
2. OPERATION DESCRIPTION
C9500/C9300, a tandem color electrophotographic page printer, adopts technologies such as
4992-LED array, OPC, dry single-component non-magnetic developing, roller transfer and heat-
compression fusing. The printing method is black writing by shedding light on print areas.
Figure 2.1 provides the block diagram of this device.
3P
Fan(PU)
MPT Assy
CoverAssyInner
PrinterUnitChassis
PrinterUnitChassis
Connector for OptionTray
GuideAssy-R_1st
FrameAssyHopper
FrameAssyHopper
FrameAssyLower
This side is the cutting corner.
MotorAssyMain
Cable P9
Regist
Clutch
FFPOS
Cable P23
Cable P3
black
3P
PENDF blue
3P
red
red
2P
16P
14P
22P
2P
5P
6P
4P
14P
PARTTEMP
FRPUCL
HOPLIFT
yellow
yellow
yellow
yellow
yellow
2P
black
IDPOSC
IDC
ID FUSE (C)
black
3P
OHP1 red
4P
Humidity
Tempature green
3P
4P Cable P14
brown
PEND
Hopping
white
white + blue
3P
PNEND blue
4P
Paper thickness Yellow
5P
BELT FUSE
IDPOSM
IDM
ID FUSE (M)
IDPOSY
IDY
ID FUSE (Y)
IDPOSK
IDK
ID FUSE (K)
LiftUp
Density red
4P
9P
Exit
7P yellow Cable P4
Cable P6
6P
Cable P12
Cable L7
Cable L1
Cable P2
Cable P10
Cable P11
7P red
14P gray
blue
PCB-Z7R
4P
HOP (INSNS1)
PAPIN(INSNS2)
PSWR(WRSNS)
TNRFUL
gray
PCB-Z7L
3P
2P
white
Feed
Pickup Clutch
black
2P
4P
2P
red
15P
Cover Open Switch
Right Side
2P yellow
FeedRoller Clutch 3P
7P blue
white
GuideAssy-R_1st
Connector for Duplex
10P
9P
DUPLEX PSIZE HVOLT POWER
black
red
Cable P19
Cable L4
2P
3P
CN7
CN5
CN8
CN9
CN10
3P
16P
6P
PCB-B73 CN1
3P
2P
2P
14P
CN2
3P
Stacker Cover
Open Switch
yellow Cable P18
COVOPN
STDUCOV
CUIF
YPOW
Y1200
26P
black
Cable P17
3P
16P
16P 6P
Upper Cover
Open Switch
Fan(OUT)
yellow
Cable P16 Cable FP2
PCB-N71
PCB-X7N
PCB-Y73
PCB-R71
LV POWER
HV POWER
PCB-K7N
PCB-A73
black
black
red Cable P8
Cable P7
Cable P25
Cable P15
Cable FP1
Geard
Motor
Belt
Motor
4P
yellow
Cable P26
Cable P24 Cable P21
CableY1
Cable P22
blue
Heat
Motor SHUTTER
Solenoid
6P
white
FF/
Regist
Motor
4P
black
Hopping
Motor
4P
2P 8P
8P
Cable P1
SHUTTER
BEL THET
JOBOFF
RCL
REG
RSNSFSENSFEED
JODEN
FAN1
10P
HOPFF
KPOW
M1200
K1200
CPOW
MPOW
C1200
OPTN
OPTN
Jam
CableY6
CableY3
brown
green
blue
20P
FDWPAP
JOBOFFPE
JOBOFFS
TR10P
GEARED
black
black
yellow
red
Joboff
Motor
Fan
(Fuser)
3P
Cable L5 Cable L2
CN2
Cable L6 Cable L3
Fan(IN)
FaceDown
Solenoid
Front Fan
Exit
Solenoid
red
Fuser Fan
4P
yellow
yellow
Yellow
6P
yellow
16P
ID
Y IDU
Motor
Black
6P
black
K IDU
Motor
Red
6P
red
M IDU
Motor
Blue
6P
10P 10P
3P 3P
14P
12P
PANEL
KPOW2
TNRK
Cable FY1
CableY2
Cable FP4
Cable FP8
TNRY
TNRM
TNRC
blue
C IDU
Motor
K LED HEAD
3P 3P
14P
12P
YPOW2
CableY2
Cable FP5
Cable FP9
Cable FP6
Cable FP10
Cable FP7
Cable FP11
Cable FP3
Y LED HEAD
3P 3P
3P
6P
4P
14P
14P
12P
MPOW2
CableY2
CableY5
M LED HEAD
3P 3P
3P
3P
14P
12P
20P
CPOW2
CableY2
STUCK POWER
C LED HEAD
Stack Full
Switch / Sensor / Clutch
Fan
Offset Home
CableY4
Paper End red
3P 3P
red
redred
red
yellow
7P white
black
26PCN1
CN3
This side is the cutting corner.
FAN
RAM
TIG board
ROM
HDD
LAN
USB
CENTRO
Figure 2.1.1
600dpi

41956001TH Rev.1 14 /
Oki Data CONFIDENTIAL
1200dpi
Exit
PENDF
OHP1
FFPOS
PEND
PNEND
black
red
white
blue
Humidity
Tempature green
RCL
RSNS
POWER
PSIZE HVOLT
JODEN
FSENS
TR1OPREGBELTHET
DUPLEX
PCB-K7N
PARTTEMP
SHUTTER
FAN1
COVOPN
JOBOFF
ID
HOPFF
FRPUCL
FEED
HOPLIFT
GEARED
STDUCOVCUIF
red
yellow
yellow
yellow
MAIL
HEAD32
HEAD34
K IDU
Motor
6P
Black
black yellow
Y IDU
Motor M IDU
Motor
red blue
C IDU
Motor
Yellow
Red
Blue
6P 6P 6P
HOP(INSNS1)
PCB-R71
PAPIN(INSNS2)
PSWR(WRSNS)
TNRFUL
ID FUSE (C)
ID FUSE (K)
ID FUSE (Y)
ID FUSE (M)
IDPOSK IDPOSYIDPOSMIDPOSC
PCB-N71
IDC
IDM
IDY
IDK
PickupClutch
FeedRoller Clutch
SHUTTER
Solenoid
Heat
Motor
Belt
Motor
Hoppi
ng
Motor
black
FF/
Regist
Motor
Regist
Clutch
CoverOpenSwitch
Right Side
Stacker Cover
OpenSwitch
Cable P18P
3P
Exit
Solenoid
FaceDown
Solenoid
Fan(OUT)
CN8
CN9
CN2
CN1
CN5
CN10
CN7
CN3
LV POWER
redred
14P
3P
Cable L4
26P
3P
Cable L5
3P
Cable L2
2P
Cable L3
Cable L6
2P
Fan(IN)
Front Fan
CN2
CN1
HV POWER
Cable L7
3P
Joboff
Motor
yellow
yellow
FuserFan
yellow
red
black
blue
white
black
PCB-Y7X
CLEDHEAD
YLEDHEAD
KLEDHEAD
Cable FY1
6P
TNRK
TNRY
STUCKPOWER
PANEL
MPOW2
CPOW2 YPOW2 KPOW2
TNRM
TNRC
JOBOFFS
JOBOFFPEFDWPAPHEAD32
3P
3P
3P
3P
HEAD34
CPOW
C1200
M1200
MPOW
YPOW
Y1200
K1200
KPOW
Offset Home
Jam
3P
3P
Paper End
MLEDHEAD
CableY23P
CableY2
3P
CableY2
3P
CableY2
3P
6P
PCB-X7N
CableY3 blue
CableY5
14P
3P
4P
3P
34P
3P
6P
CableY4
CableY6 brown
CableY1
12P
14P
red
green
StackFull
12P
14P
12P
14P
12P
14P
32P
Cable FY3
Cable FY2
Cable FY3
Cable FY3
Cable FY3
Cable FY2
Cable FY2
Cable FY2
red
Fan(PU)
2P
MPT Assy
Connector for OptionTray
FrameAssyHopper
blue
3P
3P
Feed
GuideAssy-R_1st
blue
gray
PCB-Z7L
PCB-Z7R
PrinterUnitChassis
MotorAssyMain
PrinterUnitChassis
FrameAssyHopper
yellow
Connector for Duplex
32P
4P
white
yellow
6P2P
3P
3P
2P
Cable P2
Cable P4
Cable P3
Cable P9
Cable P8
Geard
Motor
Cable P7
black
red
3P
2P
4P
7P
7P
yellow
yellow
Cable P10
4P
4P
2P
Cable P11
14P
10P
Cable P12
Cable P13
black
9P
Cable P14
6P
4P
brown
Cable P15
7P
7P
16P6P
6P
Cable FP1
16P
Cable FP2
16P
3P
Cable P16
26P
Cable P17
Cable L1
black
UpperCover
OpenSwitch
yellow
Cable P18
4P
yellow
red
2P2P
red
Cable P19
red
red
10P
16P
Cable P22
Cable P21
3P
4P
yellow
red
Cable P23
Cable P24
4P
4P
black
white
8P
Cable P26
white
yellow
blue
CoverAssyInner
3P
2PGuideAssy-R_1st
Fan
Switch/Sensor/Clutch
PCB-B73
PCB-A73
LiftUp
Hopping
15P
black
black
FrameAssyLower
Fan
(Fuser)
red
3P
Paper thickness
Density
This sideis thecuttingcorner
This sideis thecuttingcorner
yellow
4P
16P14P
red
5P
gray
14P9P
Cable P6
6P
white+blue
22P4P
5P
Cable P25
2P
black
PCB-C73
Connector for Finisher
Cable P20
8P
8P
brown
34P
Cable FP12
Cable FP13
black
BELT FUSE
Figure 2.1.2

41956001TH Rev.1 15 /
Oki Data CONFIDENTIAL
cable F1
This side is the cutting corner.
6P
13P
7P
blue
SNSO
MAIN1
White
1
13 61
7P
white
CL1
21
CL2
31
MOTOR
41
PCB-V7X
Motor
MAIN2 1
14
3P
3PCable 4 PickUpClutch
4P
6P
SNS1
63
SNS2
14
SNS3
1
1
PNEND
cable 6
cable 2
cable 10
Geard
Motor
cable 1
blue
3P
4P
PEND
cable 6
Yellow
cable 5
brown
3P
4P
6P 3P
Feed
cable 7
brown
2P
Cover
Open
cable 8
red
cable 11
black cable 9
black
2P
2P
2P
1
PSZ6
2P 3P
Cable 3
white
red
FeedRollerClutch
2P
PCB-B73
6P
This side is the cutting corner.
7P
blue
black
7P
white
Hopping
LiftUp
PCB-A73
GDDC
21
This side is the cutting corner.
3P
6P
13P
7P
blue
SNSO
MAIN1
White
1
13 61
7P
white
CL1
21
CL2
31
MOTOR
31
Front cable 4
green
PCB-V73
Motor
3P
3PCable 3 FrontClutch
4P
6P
SNS1
61
In Sns
cable 5
cable 6
cable 1
blue
2PCable 2 RearClutch
Unit-Duplex
Figure 2.1.3
Tray-Second/3nd
Figure 2.1.4

41956001TH Rev.1 16 /
Oki Data CONFIDENTIAL
cable F1
This side is the cutting corner.
6P
13P
7P
blue
SNSO
MAIN1
White
1
13 61
7P
white
CL1
21
CL2
31
MOTOR
41
PCB-V7X
Motor
MAIN2 1
14
3P
3PCable 4 PickUpClutch
4P
6P
SNS1
63
SNS2
14
SNS3 GDDC
121
1
PNEND
cable 6
cable 2
cable 10
Geard
Motor
cable 1
blue
3P
4P
PEND
cable 6
Yellow
cable 5
brown
3P
4P
6P 3P
Feed
cable 7
brown
2P
Cover
Open
cable 8
red
cable 11
black cable 9
black
2P
2P
2P
1
PSZ6
2P 3P
Cable 3
white
red
FeedRollerClutch
2P
PCB-B73
6P
This side is the cutting corner.
7P
blue
black
7P
white
Hopping
LiftUp
PCB-A73
cable F1
This side is the cutting corner.
6P
13P
7P
blue
SNSO
MAIN1
White
1
13 61
7P
white
CL1
21
CL2
31
MOTOR
41
PCB-V7X
Motor
MAIN2
1
14
3P
3PCable 2 PickUpClutch
4P
6P
SNS1
63
SNS2
14
SNS3 GDDC
121
1
PNEND
cable 4
cable 7
Geard
Motor
cable 1
blue
3P
4P
PEND
cable 4
Yellow
cable 3
brown
4P
6P
2P
Cover
Open
cable 5
red
cable 8
black cable 6
black
2P
2P
2P
1
PSZ6
red 2P
PCB-B73
6P
Hopping
LiftUp
PCB-A73
Tray_Option(Top/Middle Tray of LCF)
Figure 2.1.5
Tray_Option(Bottom Tray of LCF)
Figure 2.1.6

41956001TH Rev.1 17 /
Oki Data CONFIDENTIAL
2.1 Main Control Board (TIG-PWB)
Figure 2.2 provides the block diagram of the main control board (TIG-PWB).
3
PU-CU
200
pin
C2516
EEPROM
Video Data K, Y, M, C
Video I/F From PU
PU-CU I/F To C2 LSI
to PU PU-CU Command I/F
to PU Panel I/F
A [31:0]
SUB Bus A/D [31:0], Cont
[15:0]
SPD
[2]
[1]
[0]
SUB Bus
a Line Address. Cont
b Line Address. Cont
D [63:0]
[15:0][7:0]
D [63:0]
D [63:0] D [63:0]
D
[15:0]
Cont
Panel I/F From C2 LSI
3.3V
Reset IC
2.5V
1.8V
12V
3.3V 5V
2.5V
14.31818MHz
Crystal
Resonator
M62733ML
(PU3V)
PST596
(PU12V)
PST596
(+5V)
internal
CPU CLK
setting Resister
PLL702-01
3.3V
Regulator
PPC
750cx
Core:1.8V
I/O:2.5V
2.5V
Regulator
CA1 LSI
MHM
2030-003
(uPD856
11N7)
Core:2.5V
I/O:3.3V
CPU I/O:2.5V
C2 LSI
MHM2031-002
DRCLK
3.3V
100MHz
RAMCLK
From 702
LVC
161284
PLL102-5
33MHz ·5 33MHz 3.3V ·4
33MHz 3.3V
USB
C
e
n
t
r
o
L60851
PCI
Slot
FPGA
for IDE
CENT
PCI
Reset
IDE
HDD
I/O 2.5V
74LVC04 to each LSI
MPUCLK
2.5V
100MHz
CA1CLK
2.5V
100MHz
48MHz
to USB
33MHz
33MHz
33MHz
Local
33MHz
48MHz
A,Cont
1.8V
Regulator
+
Flash
Mask 32bit ·2
ROM DIMM ·2
SDRAM DIMM ·3
SDRAMCLK·12
3.3V 100MHz
12
PCI BUS [31:0]
Figure 2.2

41956001TH Rev.1 18 /
Oki Data CONFIDENTIAL
(1) CPU
TheCPUis64-bitbusRISCprocessorPowerPC750CXe,whichreceivesaninputof100MHz
(=BUS CLK) and operates at 450MHz or 600MHz.
(2) Secondary Cache SRAM
PowerPC750Cxe has its cache only inside of it.
Speed: Same as CPU Core CLK speed
Capacity:
Primary Cache: 32 K bytes in D-cache capacity, 32 K bytes in I-cache capacity
Secondary Cache: 256 K bytes
(3) ROM
TheROMisinsertedintothetwo168th-pinDIMMslots. TheslotAisforaprogramROMand
the slot B is for the Japanese Kanji font.
(4) RAM
The RAM is inserted into the three 168th-pin DIMM slots.
SDRAM DIMM Specifications:
Speed: PC133 or more
Capacity: 64/128/256/512MB
Configuration: Without parity and ECC. Requires the SPD information.
(5) EEPROM
TheEEPROM, an8-pinDIPpackage,isinsertedintothe ICsocketandof16kilobitsfor3.3V
power supply. Settings for controlling the controller block are stored in the memory.
(6) Flash ROM
A4MBflashROMissurface-mountedontheTIGboard. TheflashROM can store fonts and
macros.
(7) Memory Control LSI (CAI)
A 696-pin BGA package ASIC made by NEC. The chip mainly controls a CPU I/F, memory,
video data compression and decompression, and PU-video I/F.
(8) Interface Control LSI (C2)
A BGA package ASIC made by Toshiba, which controls a PU command I/F, operator panel
I/F, IDE I/F, Centronics I/F, USB I/F, PCI I/F, EEPROM and SPD (SDRAM DIMM) I/F.
(9) IDE HDD
An IDE connector is surface-mounted on the board to which an IDE HDD assembled using
molds for the purpose is connected. The IDE HDD is used for storing font data, spooling
edited video data temporarily and registering form data.
(10) PCI Bus Option
TwoPCII/Fslotsareprovidedforoptionboarduse. Thebus,whichusesanOkiDataoriginal
connector, can accept an Ethernet board.
(11) Host Interface
Standard: Centronics two-way parallel I/F (IEEE-1284-compliant)
USG (USB1.1-compliant)
Additional Board: (connected to PCI BUS)
Ethernet Board

41956001TH Rev.1 19 /
Oki Data CONFIDENTIAL
Figure 2.3
Theenginecontrolblock(PU)iscontrolledbytheenginecontrolboard(K7NPWB)whichconsists
of a CPU (MSM66Q577), general LSI chip (DCON, MCON), flash ROM, EEPROM, SRAM,
SDRAM and pulse motor drivers (see Figure 2.3).
(1) CPU
This, a 16-bit CPU with an AD converter (OKI MSM66Q577), controls the entire system.
(2) DCON LSI
This LSI (UPD65454GD-241-LML, UPD65946GD-137-LML), which is contained in the
printer engine control block, incorporates 16 megabits of video memory and has functions
suchasengine-controllerinterfacing,LEDinterfacing,videomemorycontrol,mainscancolor
misalignment correction and skew correction.
2.2 Engine Control Board (K7N PWB)
OPTION TRAY
INT
28MHz
CPU
MSM66Q577
FLASH
MCON
LSI
SRAM
EEPROM
CONTROL
PANEL
MOTOR
DRIVER PULSE
MOTOR *9
GEARED
MOTOR
CLUTCH
LED HEAD (K)
LED HEAD (Y)
LED HEAD (M)
LED HEAD (C)
PU FAN
FUSER FAN
ID, BELT,
FUSER
CHECKS
CLOCK
GENERATOR
DCON
LSI
MOTOR
DRIVER
CLK
RESET
DUPLEX
PAPER SIZE
STACKER FULL
CU
SDRAM
SDRAM
PAPER THICKNESS
SENSOR
COROR REGISTRATION
SENSOR
COVER OPEN
(UPPER, STACKER, RIGHT SIDE)
1ST TRAY SENSORS
(PAPER END, PAPER NEAR END)
PAPER FEED SYSTEM SENSORS
(PAPER FEED, PAPER
REGISTRATION, EJECT)
MT SENSORS
(STAGE POSITION, PAPER END)
DISPOSAL TONER SENSOR
HEAT ROLLER TEMP
OHP
TEMPATURE
HUMIDITY
HEAD TEMP
DENSITY
ANALOG
SW
32MHz
HIGH VOLTAGE POWER
SUPPLY SERIAL INTERFACE

41956001TH Rev.1 20 /
Oki Data CONFIDENTIAL
2.3 Power Units
Therearealow-voltagepower unit, which consistsofanACfiltercircuit,low-voltage power circuit
andheaterdrivercircuit,andhigh-voltagepowerunitwhichorganizesahigh-voltagepowercircuit.
(1) Low-Voltage Power Unit
This circuit generates the following voltages:
(3) MCON LSI
This LSI is used for inport of SENSORs and the cntrols of Pulse Motors,Cluches,FANs and
High Voltage Power Supply.
(4) Flash ROM
The flash ROM (29F800-70) is of 8-Mbits, and PU programs are stored in it.
(5) EEPROM
The EEPROM (NM93C66N-NW) is of 4-Kbits, and mounted on the board with an IC socket.
Correction values are stored in it.
(6) Pulse Motor Driver
The pulse motor driver (A2919SLBTR, A3955SLBTR,MTD2005) drives the eight pulse
motors to revolve the ID and transport media.
(7) SRAM
This SRAM (628100LG-55L) is used as working memory of the CPU.
(8) SDRAM
This SRAM (56V16160T) is used as data memory of the DCON LSI.
Output Voltage Use for Remark
CH -1000V to 1.4KV+/-50V Voltage to charging roller
DB -50 to -300V/ +300V Voltage to developing roller
SB -300V to -450V/ 0V Voltage to toner supplying roller
TR C: 0KV to 7KV Voltage to transfer roller Variable
K,Y,M: 0KV to 6KV
(2) High Voltage Power Unit
This circuit generates the following voltages of not less than +34V, which are required for
electrophotographic process, according to control sequences from the controller board.
Output Voltage Use for
+5 V LED head
+5 V Logic circuit power supply, PU CPU
+34 V Motor, drive voltage and power supply voltage for high voltage power supply
+12 V High voltage power supply, Media Thickness Sensor power supply