Oki C8800 series User manual

Oki Data CONFIDENTIAL
C8800
Maintenance Manual
072007A

43170003TH Rev.2 2 /
Oki Data CONFIDENTIAL
Document Revision History
Rev.No. Date Corrected items Person in
charge
No. Page Description of change
1 2007-01-22 Issue MD3 Wakana
2 2007-04-23 Substantial change MD3 Matsumoto

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Oki Data CONFIDENTIAL
PREFACE
This manual explains the maintenance methods for the C8800.
The manual has been prepared for use by the maintenance personnel. For operating methods of the
C8800, refer to the corresponding user's manual.
Note! • The contents of this manual are subject to changes without prior notice.
• Despite that exhaustive efforts were made in preparing the manual to make it accurate, it
still may contain errors. Oki Data will not hold itself liable for any damage that results or is
claimed to have resulted from repair, adjustment, or modification of the printer conducted by
the user using this manual.
• The parts employed in the printer are so delicate that they may be damaged if not treated
properly. Oki Data strongly recommends that the maintenance of the printer be undertaken
by Oki Data's registered maintenance personnel.
• Work after eliminating static electricity.

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Oki Data CONFIDENTIAL
ContEnts
1. ConFIGURAtIon ................................................................................................7
1.1 System configuration.............................................................................................................7
1.2 Printer configuration..............................................................................................................9
1.3 Composition of optional items.............................................................................................11
1.4 Specifications......................................................................................................................12
1.5 Interface specifications .......................................................................................................15
1.5.1 USB interface specifications..................................................................................15
1.5.1.1 Outline of USB interface.........................................................................15
1.5.1.2 USB interface connectors and cables....................................................15
1.5.1.3 USB interface signals.............................................................................15
1.5.2 Network interface specifications............................................................................16
1.5.2.1 Outline of network interface....................................................................16
1.5.2.2 Network interface connectors and cables..............................................16
1.5.2.3 Network interface signals.......................................................................16
1.5.3 Parallel interface specifications.............................................................................17
1.5.3.1 Parallel Interface Overview ....................................................................17
1.5.3.2 Parallel Interface Connector and Cable.................................................17
1.5.3.3 Parallel Interface Level ..........................................................................17
2. EXPLAnAtIon oF oPERAtIon ......................................................................18
2.1 Electrophotographic processing mechanism......................................................................18
2.2 Printing process ..................................................................................................................23
3. InstALLAtIon...................................................................................................33
3.1 Cautions, and do's and don'ts.............................................................................................33
3.2 Unpacking method..............................................................................................................35
3.3 Printer Installation Instructions............................................................................................36
3.4 Listing of component units and accessories.......................................................................37
3.5 Assembling method.............................................................................................................38
3.5.1 Assembly of printer main body ..............................................................................38
3.5.2 Connection of power cable....................................................................................44
3.5.3 Installation of optional items..................................................................................47
3.5.4 Confirmation of recognition of optional items........................................................60
3.6 Menu Map print ...................................................................................................................61
3.7 Connection methods...........................................................................................................63
3.8 Confirmation of paper used by the user..............................................................................65
4. REPLACEMEnt oF PARts ..............................................................................66
4.1 Precautions on the replacement of parts............................................................................66
4.2 Part replacement methods..................................................................................................68
4.2.1 Belt unit .................................................................................................................68
4.2.2 Fuser unit...............................................................................................................69
4.2.3 Left side cover .......................................................................................................70
4.2.4 Right side cover.....................................................................................................71
4.2.5 Rear cover Assy.....................................................................................................72
4.2.6 LED Assy. ..............................................................................................................73
4.2.7 Main controller PCB, ID motor, ID lift-up motor, and paper feed motor.................74
4.2.8 Print engine controller PCB ...................................................................................76
4.2.9 Top cover Assy.......................................................................................................80
4.2.10 Top cover...............................................................................................................82
4.2.11 Control panel Assy.................................................................................................83

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Oki Data CONFIDENTIAL
4.2.12 Board PRP.............................................................................................................84
4.2.13 Shaft Assy.-eject (FU) and shaft Assy.-eject (FD).................................................85
4.2.14 Guide Assy.-eject-lower, Assy.-color-regist and relay board (P6Y).......................86
4.2.15 Fan (fuser), high-voltage power supply board, contact Assy.
and fuser sensor Assy. ..........................................................................................88
4.2.16 MPT Assy., MPT hopping roller, separator-frame Assy. and roller Assy.-pick-up..89
4.2.17 Registration roller Assy..........................................................................................90
4.2.18 Gear box, registration roller, hopping roller Assy. and solenoid............................91
4.2.19 Holder Assy.-switch, low-voltage power supply fan and low-voltage power supply92
4.2.20 Belt motor Assy. and fuser motor Assy..................................................................93
4.2.21 Side Assy.-R and side Assy.-L...............................................................................94
4.2.22 Paper feed roller (Tray1)........................................................................................95
4.2.23 Paper feed roller (Tray2 (Optional)).......................................................................97
4.2.24 Paper feed roller (Multi-purpose Tray).................................................................100
4.3 Lubricating points..............................................................................................................101
5. MAIntEnAnCE MEnUs..................................................................................129
5.1 System maintenance menu (For maintenance personnel)................................................129
5.2 Maintenance utility ............................................................................................................133
5.3 Functions of user's maintenance menu ............................................................................136
5.3.1 Maintenance menu (For end users) ....................................................................136
5.3.2 Self-diagnostic mode...........................................................................................137
5.3.2.1 Operator panel......................................................................................137
5.3.2.2 Normal self-diagnostic mode (Level 1).................................................140
5.3.2.2.1 Activation method for self-diagnostic mode (Level 1) ......141
5.3.2.2.2 Deactivation of self-diagnostic mode................................141
5.3.2.3 Switch scan test ...................................................................................141
5.3.2.4 Motor clutch test...................................................................................144
5.3.2.5 Test print...............................................................................................146
5.3.2.6 Color registration adjustment test ........................................................151
5.3.2.7 Print density adjustment test................................................................152
5.3.2.8 Indication of consumable part counters ...............................................154
5.3.2.9 Indication of printed page counters......................................................155
5.3.2.10 Factory/Shipping switching ..................................................................155
5.3.2.11 Setup of self-diagnostic function...........................................................156
5.3.2.12 Indication of LED head serial number...................................................157
5.3.2.13 Details of panel indications...................................................................158
5.3.3 Various types of print on the individual printer equipped with controller .............178
5.3.4 Functions of keys when depressed at power-on .................................................178
5.4 Setup after replacement of parts.......................................................................................179
5.4.1 Precautions on the replacement of engine control PCB......................................179
5.4.2 Setup of EEPROM after replacement of CU PCB ...............................................182
5.4.2.2 Setup of CU Serial Number..................................................................182
5.4.2.1 Replacement of EEPROM after replacement of PDL CU PCB(C8800)182
5.4.3 Setup of destination.............................................................................................183
5.5 About the manual setup of Print density adjustment.........................................................184
6. CLEAnInG........................................................................................................185
6.1 Cleaning............................................................................................................................185
6.2 Cleaning of LED lens array ...............................................................................................185
6.3 Cleaning of pickup rollers..................................................................................................187

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Oki Data CONFIDENTIAL
7. tRoUBLEsHootInG PRoCEDUREs............................................................188
7.1 Precautions prior to repair.................................................................................................188
7.2 Items to be checked prior to taking action on abnormal images.......................................188
7.3 Precautions when taking action on abnormal images ......................................................188
7.4 Preparations for troubleshooting.......................................................................................188
7.5 Troubleshooting method....................................................................................................188
7.5.1 LCD Message List ...............................................................................................189
7.5.2 Preparing for troubleshooting ..............................................................................214
7.5.2.(1) LCD Display Malfunction ...................................................................216
7.5.2.(2) Irregular Operation of the device after turning on the power.............219
7.5.2.(3) Paper Feed Jam(Error 391:1st Tray)..................................................229
7.5.2.(4) Paper Feed Jam (Error 390:Multi-purpose Tray)...............................231
7.5.2.(5) Paper Path Jam(Error 381)................................................................233
7.5.2.(6) Paper Exit Jam(Error 382).................................................................238
7.5.2.(7) Duplex Print Jam(Error 370,371,372,373,383)..................................240
7.5.2.(8) Paper Size Error (Error 400)..............................................................242
7.5.2.(9) ID Unit Up-Down Error(Service Call 140-143)...................................243
7.5.2.(10) Fuser Unit Error(Error 170-177) .........................................................244
7.5.2.(11) Motor Fan Error(Error 120,127,051)....................................................245
7.5.2.(12) Print Speed is Slow (Low Performance)............................................245
7.5.2.(13) Option unit is not recognized.............................................................246
7.5.2.(14) LED head is not recognized(Error 131,132,133,134)..........................247
7.5.2.(15) Toner cartridge is not recognized(Error 540,541,542,543)................248
7.5.2.(16) Fuse Cutout Error (Error 150-155).....................................................249
7.5.2.(17) Dew Condensation Errors (Error 123)...............................................250
7.5.2.(18) Connection Diagrams........................................................................251
7.5.3 Image Problem Troubleshooting..........................................................................252
7.5.3.(1) Color is totally pale (Fig.7.2 A)...........................................................253
7.5.3.(2) Background is dirty (Fig.7.2 B) ..........................................................254
7.5.3.(3) Blank Print (Fig.7.2 C)........................................................................255
7.5.3.(4) Vertical lines are printed....................................................................256
7.5.3.(5) Cyclic Print Trouble (Refer to Fig.7.2 E).............................................257
7.5.3.(6) Color registration is wide...................................................................258
7.5.3.(7) Solid Black Print.................................................................................259
7.5.4 Actions after forced initialization of Flash............................................................260
7.5.5 Network Troubleshooting.....................................................................................261
7.6 Check of fuses ..................................................................................................................262
7.7 Table of correspondence between paper cassette switch and paper sizes......................263
8. ConnECtIon DIAGRAMs..............................................................................264
8.1 Check of resistance values...............................................................................................264
8.2 Component layout.............................................................................................................268
8.3 F/W version.......................................................................................................................281
8.3.1 ROM management number.................................................................................281
8.3.2 Check and version display...................................................................................281
8.3.3 Stamped maintenance board parts markings......................................................282

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Oki Data CONFIDENTIAL
1. CONFIGURATION
1.1 System configuration
Figure 1-1 represents the system configuration of the printer.
Figure 1-1
K LED HEAD Y LED HEAD
M LED HEAD
C LED HEAD
Operator panel PCB
Toner sensor PCB
High-voltage PCB
RFID PCB
Low-voltage PCB
ARMORED CPU Paper feed
solenoid
Duplex
FAN
Front
sensor
IN
sensor
Cover-
open
sensor
Rear
sensor Bottom
sensor
2nd
P.E
sensor 2nd-IN
sensor 2nd
paper
size SW
Front sensor PCB
DUPLEX PCB 2nd TRAY PCB
IN1 IN2 WR
M
ID M
HOP M
IDUP
M
HEAT
Fuser-
end colling
FAN
shutter
solenoid
M
BELT
Feeding
clutch
Paper feed/
transportation
motor
Duplex
clutch
Separator
solenoid
Duplex
motor
Paper
size
SW
Belt unit
PU PCB
Junction PCB
Fuser Unit Inlet
EXIT
sensor
Fuser
release
sensor
Fuser-In
sensor
Density
sensor
Color
registration
PCB right
Color
registration
PCB left
Belt unit
fuse-cut
Fuser fuse-cut, UP&Low,
upper center/compensation
upper-side/Lower thermistor
Fuse-cut,
EXIT
Color drift, density,
thermistor signal 20MHz
FLASH
8Mbit
High-voltage I/F,
fan control, cover-open FAN, heater control,
others
Fuser-In, release
5V, 24V, 0VL, 0VP
EEPROM
K-ID Y-ID M-ID C-ID Low-
voltage
FAN AC-SW
Fuser
fan
Belt
thermi-
stor
ID UP/
DOWN
Cover-
open
sensor
K toner
sensor Y toner
sensor M toner
sensor C toner
sensor IDfuse-cut
SPILYTAS
(Built-in by CPU)
ASIC
LAN USB
CU PCB
LEISUS
command I/F
Environment
sensor
DCON I/F LSYNC
LAN
controller
USB
device
controller
1st
P.E
sensor
Environmental humidity

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Oki Data CONFIDENTIAL
C8800
Figure 1-1(C8800) represents the system configuration of the printer.
Figure 1-1(C8800)
Operator panel PCB
Toner sensor PCB
High-voltage PCB
RFID PCB
Low-voltage PCB
ARMORED CPU
Paper feed
solenoid
Duplex
FAN
Front
sensor
IN
sensor
Cover-
open
sensor
Rear
sensor Bottom
sensor
2nd
P.E
sensor 2nd-IN
sensor 2nd
paper
size SW
Front sensor PCB
DUPLEX PCB 2nd TRAY PCB
IN1 IN2 WR
M
ID M
HOP M
IDUP
M
HEAT
Fuser-
end colling
FAN
shutter
solenoid
M
BELT
Feeding
clutch
Paper feed/
transportation
motor
Duplex
clutch
Separator
solenoid
Duplex
motor
Paper
size
SW
Belt unit
PU PCB
Junction PCB
Fuser Unit Inlet
EXIT
sensor
Fuser
release
sensor
Fuser-In
sensor
Density
sensor
Color
registration
PCB right
Color
registration
PCB left
Belt unit
fuse-cut
Fuser fuse-cut, UP&Low,
upper center/compensation
upper-side/Lower thermistor
Fuse-cut,
EXIT
Color drift, density,
thermistor signal 20MHz
FLASH
8Mbit
High-voltage I/F,
fan control, cover-open FAN, heater control,
others
Fuser-In, release
5V, 24V, 0VL, 0VP
EEPROM
K-ID Y-ID M-ID C-ID Low-
voltage
FAN AC-SW
Fuser
fan
Belt
thermi-
stor
ID UP/
DOWN
Cover-
open
sensor
K toner
sensor Y toner
sensor M toner
sensor C toner
sensor IDfuse-cut
Environment
sensor
1st
P.E
sensor
Environmental humidity
Centronics
EEP
ROM
K LED HEAD
Y LED HEAD
M LED HEAD
C LED HEAD
CC1
ASIC
CIF2
ASIC
HDD
LAN USB
CUPCB
Flash
ROM
Option
RAM
LEISUS command I/F
DCON I/F LSYNC
CU
FAN CPU

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Oki Data CONFIDENTIAL
1.2 Printer configuration
The internal part of the printer is composed of the following sections:
• Electrophotographic processing section
• Paper paths
• Control sections (CU sect./PU sect.)
• Operator panel
• Power supply sections (High-voltage sect./low-voltage sect.)
Figure 1-2-1 represents the configuration of the printer.
Figure 1-2-1

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Oki Data CONFIDENTIAL
The internal part of the C8800 printer is composed of the following sections:
• Electrophotographic processing section
• Paper paths
• Control sections (CU sect./PU sect.)
• Operator panel
• Power supply sections (High-voltage sect./low-voltage sect.)
Figure 1-2-2 represents the configuration of the printer.
Figure 1-2-2

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Oki Data CONFIDENTIAL
1.3 Composition of optional items
The following optional items are available for the printer:
(1) Second tray
(2) Duplex-Unit
(3) Expansion Memory (C8800) 256 MB / 512 MB
For long printing, it is recommended to add
an expansion memory.
* Not compatible with the expansion memo-
ries for .
(4) Hard disk (C8800)
Note! Hard disks for C8800 are incompatible with those for C5900.

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Oki Data CONFIDENTIAL
1.4 Specifications
Division Item C8600 C8800
External
dimensions Width 485mm
Depth 556mm
Height 341mm
Mass Approx. 40kg
Print width Print width A4 (Landscape)
Engine speed
(A4 LEF) Monochrome 32ppm
Color26ppm
First print time
(A4 LEF) Monochrome 9.5 sec
Color 10 sec
Warm-up time 90 sec
Low-noise mode Not applicable
Resolution LED head 600 dpi
Max. input resolution 600 x 1200 dpi
Output resolutionTrue 600 x 1200 dpi
True 600 x 600 dpi
Gradation Not applicable
Econo-mode Toner-saving by increasing lightness
CPU Core PowerPC405 PowerPC750
I-cache / D-cache 16KB/ 16KB L2=256KB
Clock 200MHz 500MHz
Bus width 32bit 64bit
RAM Resident 128MB 256MB
ROM Program + font N/A 64MB
Power
consumption Power input(230V) 220~240VAC 12011
Power-save mode 15W or less 17W or less
Idle200W (Average)
Normal operation 550W (Depends on the use environment)
Peak 1300W
Operating
environment
(Temperature)
When operating 10˚C~32˚C, 17˚C~27˚C
(Full-color print quality guarantee temperature)
When not operating 0˚C~43˚C, Power off
When stored
(For max. 1 yr.) -10˚C~43˚C, With drum and toner
When transported
(For max. 1 mo.) -29˚C~50˚C, With drum, but no toner
When transported
(For max. 1 mo.) -29˚C~50˚C, With drum and toner
20%~80%, 50%~70%
(Full-color print quality guarantee humidity)
Operating
environment
(Humidity)
When operating Max. wet-bulb temp.: 25˚C
When not operating 10%~90%, Max. wet-bulb temp.: 26.8˚C, with power off
When stored 10%~90%, Max. wet-bulb temp.:35˚C
When transported 10%~90%, Max. wet-bulb temp.: 40˚C

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Oki Data CONFIDENTIAL
Division Item C8600 C8800
Service life Printer life 600,000 pages, 5 years
Print duty
(M=L/12, A=L/12/5) Max. 50,000 pages / mo.
Average 10,000 pages / mo.
MTBF(2.3% duty) Not applicable
MPBF 100,000 pages
MTTR 20 minutes
Toner life
(5% duty) Starter toner (Attached)Approx. 2,000 pages (Black)
Approx. 2,000 pages (Color)
Standard Approx. 6,000 pages (Black)
Approx. 6,000 pages (Color)
With 1st new
drum Approx.5,200 pages (Black)
Approx. 5,200 pages (Color)
Image drum life Approx. 20,000 pages (With 3 pages / job)
Approx. 11,000 pages (With 1 page / job)
Approx. 27,000 pages (When printed continuously)
Drum counter automatically reset
Transfer belt life 80,000 pages (A4 size, with 3 pages / job), counter
automatically reset
Fuser unit life in operation 100,000 pages (A4 LEF size), counter automatically reset
Operation noise In operation (ISO779Front)
In one-side print 54dBA
On standby (ISO7779Front) 37dBA
Power-save mode Background level
Paper handling Paper capacity (1st tray) Legal/universal cassette:300 sheets (70kg)
Paper capacity (2nd tray) Legal/universal cassette (Optional): 530 sheets (70kg)
Paper capacity (Manual/
auto) Standard multi-purpose tray:100 sheets of paper (70kg) or
10 envelopes
Delivery 250 sheets (70kg) face-down/100 sheets (70kg) face-up in
tray
DuplexStandard
Paper size Legal/universal or A4-size
cassette/universal cassette 1st cassette: A3, A4, A5, B5, A6, legal13/13.5/14, Letter,
Executive
2nd cassette: A3, A4, A5, B5, legal13/13.5/14, Letter,
Executive
Reply-paid postcard (Max. 176gsm) (Multi-purpose tray)
Automatic front feeder or
manual feeder A3, A4, A5, B5, A6, Legal13/13.5/14, Letter, Executive,
C5, DL, Com-9, Com-10, Monarch, Custom size, banners
up to 4201,200mm(C8800) (When paper
length exceeds 356, its width shall be from 210 to 215.9.),
Postcard, Reply-paid postcard, Japanese-style envelope
Two-sided1st tray Legal13/13.5/14, Letter, Executive, A4, A5, Custom size
(Within permissible size and weight)
Min. paper size 1st tray 105 x 148 mm: A6
2nd tray 148 x 210 mm: A5
Manual & auto (MPT) 100 x 148 mm: Postcard size
Two-sided 148 x 210 mm: A5
Paper thickness 1st tray 64~120gsm
2nd tray 64~176gsm
Manual & auto (MPT) 64~200gsm OHP sheets available
Two-sided 64~105gsm

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Oki Data CONFIDENTIAL
Division Item C8600 C8800
Operator panel LCD 16 characters in 2 line (Roman alphabet/Japanese kana)
No paper size indicated
LED (Color) Two (Green x1, dark amber x1)
Switch Six
Status switch/
sensor Paper out Provided
Paper low Not provided
Toner low Provided (Y, M, C, K)
Cover open Provided
Fuser unit temp. Provided
Paper size Provided (Manual operation)
Stacker full Not provided
Communication
interface Standard (On PCB) • Hi-Speed USB
• Ethernet • Hi-Speed USB
• Ethernet
• Parallel Interface
Option Not available Host USB
Input/output switch Automatic
Emulation Standard Hiper-C PCL (PCL5c, HP-GL) / PCL
XL2.1
SIDM (IBM-PPR, EPSON-
FX)
PostScript3 (Clone)
Emulation switch Not provided Automatic
Font Bit-map type face Not available Agfa 1(Line printer)
Scalable 1 type face Not available Agfa micro-type 86
Scalable 2 type face Not available Not available
Scalable 3 type face Not available Agfa micro-type 136
Rasterizer Not available Agfa UFST 4.0 (PCL)
Bar code Not available USPS
OCR Not available OCR-A,B
Japanse PCL font Not available
Japanese PS font Not available
Optional Item
(Detachable) RAM Not available 256/512MB DIMM
2.5" IDE HDD User-
installable Not available
Standard internal Hard
Disk
Common Criteria
Security Hard Disk
–
–
Tray mechanism 2nd tray mechanism
Legal/universal (530 sheets)
Cassette
Factory settings OEL GDI Model PCL + PS Model
Others USB-IF logo Available
Windows logo Available
Operation with UPS Operation with UPS (Uninterruptible power supply) is not
guaranteed.
Do not use UPS

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Oki Data CONFIDENTIAL
1.5 Interface specifications
1.5.1 USB interface specifications
1.5.1.1 Outline of USB interface
(1) Basic specifications
USB (Hi-Speed USB supported)
(2) Transmission mode
Full speed (Max. 12Mbps ± 0.25%)
High speed (Max.480Mbps ± 0.05%)
(3) Power control
Self power device
1.5.1.2 USB interface connectors and cables
(1) Connector
• Printer side: B-receptacle (Female)
Upstream port
Product equivalent to UBR24-4K5C00 (Made by ACON)
Connector pin assignment
• Cable side:B-plug (Male)
(2) Cables
Cable length: Specification: USB2.0 type cables five meters long or shorter. Cables two
meters long or shorter are recommended. (Shielded cable lines shall be used.)
1.5.1.3 USB interface signals
Signal name Function
1 Vbus Power supply (+5V)
2 D- For data transfer
3 D+ For data transfer
4 GND Signal ground
Shell Shield
2
3 4
1

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Oki Data CONFIDENTIAL
1.5.2 Network interface specifications
1.5.2.1 Outline of network interface
1.5.2 Basic specifications of network interface
Protocol family Network protocol Application
TCP/IP IPv4, TCP, ICMP, ARP, UDP LPR, RAW, IPP, FTP, Telenet
SNMPv1
DHCP/BOOTP
DNS
UPnP
Rendezvous
SNTP
1.5.2.2 Network interface connectors and cables
(1) Connectors
100 BASE-TX / 10 BASE-T (Automatically switched, not usable simultaneously)
Connector pin assignment
2) Cables
RJ-45 connectorized non-shielded twisted-pair cable (Category 5 recommended)
1.5.2.3 Network interface signals
Pin No. Signal name Direction Function
1 TXD+ FROM PRINTER Transmitting data +
2 TXD- FROM PRINTER Transmitting data -
3 RXD+ TO PRINTER Receiving data +
4 - - Not in use
5 - - Not in use
6 RXD- TO PRINTER Receiving data -
7 - - Not in use
8 - - Not in use
1 8

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Oki Data CONFIDENTIAL
1.5.3 Parallel interface specifications
1.5.3.1 Parallel Interface Overview
1.5.3.2 Parallel Interface Connector and Cable
(1) Connector
Printer: 36pConnector (Female)
57LE-40360-12 (D56) (DDK Ltd.) equivalent product
Cable: 36pConnector (Male)
57FE-30360-20N (D8) (DDK Ltd.) equivalent product
(2) Cable
Use a cable shorter than 1.8m.
(Use a cable with a shielded twisted-pair wire for to prevent noise interference.)
1.5.3.3 Parallel Interface Level
Low Level: 0.0V to +0.8V
High Level: +2.4V to +5.0V
Pin arrangement from interface cable side
118
1936
Item Details
Corresponding mode Comatible mode, nibble mode, ECP mode
Data bit length Compatible: 8, Nibble: 4, ECP: 9 bit

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Oki Data CONFIDENTIAL
2. EXPLANATION OF OPERATION
2.1 Electrophotographic processing mechanism
(1) Electrophotographic process
The electrophotographic process is explained briefly below:
1. Charging
A voltage is applied to the CH roller to electrically charge the surface of the OPC drum.
2. Exposure
The LED head radiates light onto the charged OPC drum in accordance with the image
signal.The electric charge of the radiated part of the OPC drum surface attenuates
depending on the intensity of the light, thus forming an electrostatic latent image on the
OPC drum surface.
3. Development
Charged toner adheres to the electrostatic latent image of the OPC drum by
electrostatic power, and forms a visible image on the OPC drum surface.
4. Transfer
Paper is placed over the OPC drum surface and an electric charge is applied to it from
the back side by the transfer roller, so that the toner image is transferred to the paper.
5. Drum cleaning
The drum cleaning blade removes toner remaining on the OPC drum after the transfer.
6. Removal of Electricity
7. Belt cleaning
The belt cleaning blade removes toner remaining on the belt.
8. Fuser
Heat and pressure are applied to the toner image on the paper to promote its fusion.
(2) Charging
A voltage is applied to the charging roller, which is placed in contact with the OPC drum
surface, to charge the OPC drum surface.
-
--
--
-
Charging roller
Power
Supply
Unit
OPC drum

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Oki Data CONFIDENTIAL
(3) Exposure
The light emitted from the LED head is radiated onto the charged surface of the OPC drum.
The charge of the radiated part of the OPC drum attenuates according to the intensity of
the light, forming an electrostatic latent image on the OPC drum surface.
(4) Development
Toner adheres to the electrostatic latent image on the drum surface, thereby turning the
electrostatic latent image into a toner image.
1. The sponge roller allows the toner to stick to the development roller.
2. The electrostatic latent image on the OPC drum surface is turned into a visible image by
the toner.
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Power
Supply
Unit
OPC drum
Paper
OPC drum
LED head
Charging roller
LED head
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OPC drum
Charging roller
Sponge roller
Development roller

43170003TH Rev.2 20 /
Oki Data CONFIDENTIAL
(5) Transfer
A sheet of paper is placed over the OPC drum surface, and an electric charge is given to
the paper from its back side by the transfer roller.
When a high voltage is applied to the transfer roller from the power source, the charge
induced on the transfer roller moves on to the surface of the paper through the contact part
between the transfer roller and the paper, the toner being attracted to the paper surface
from the OPC drum surface.
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Power
Supply
Unit
OPC drum
Paper
Transport belt
Transfer roller
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Toner cartridge
Drum cleaning blade
ID unit
Waste toner
(6) Drum cleaning
Unfixed toner remaining on the OPC drum is removed by the drum cleaning blade and
collected into the waste toner area of the toner cartridge.