Oki C810 User manual

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C810/C830
Maintenance Manual
0609A
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Copyright Information
Copyright © 2009by Oki Data. All Rights Reserved
Disclaimer
Every effort has been made to ensure that the information in this document is complete, accurate, and up-to-
date. The manufacturer assumes no responsibility for the results of errors beyond its control. The
manufacturer also cannot guarantee that changes in software and equipment made by other manufacturers and
referred to in this guide will not affect the applicability of the information in it. Mention of software products
manufactured by other companies does not necessarily constitute endorsement by the manufacturer.
While all reasonable efforts have been made to make this document as accurate and helpful as possible, we
make no warranty of any kind, expressed or implied, as to the accuracy or completeness of the information
contained herein.
The most up-to-date drivers and manuals are available from the web site:
http://www.okiprintingsolutions.com

44015503TH Rev. 1 2 /
Oki Data CONFIDENTIAL
Document Revision History
Rev.
No. Date Changed items Person in charge
No. Page Description of change
1 2009-02-25 Issue MD11 Wakana
Rev.
No. Date Changed items Person in charge
No. Page Description of change
DOCUMENT REVISION HISTORY

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Oki Data CONFIDENTIAL
This manual explains the maintenance methods for the C830.
The manual has been prepared for use by the maintenance personnel. For operating
methods of the C830, 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 C830 printer are so delicate that they may be
damaged if not treated properly. Oki Data Corporation highly recommends
that the maintenance of the printer is undertaken by ODC’s registered
maintenance personnel.
• Work after eliminating static electricity.
PREFACE
PREFACE

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Oki Data CONFIDENTIAL
CONTENTS
CONTENTS
1. CONFIGURATION.....................................................................7
1.1 System configuration .........................................................................................8
1.2 Printer configuration............................................................................................9
1.3 Composition of optional items ..........................................................................10
1.4 Specifications....................................................................................................11
1.5 Interface specifications ....................................................................................14
1.5.1 USB interface specifications ................................................................14
1.5.1.1 USB interface overview .......................................................14
1.5.1.2 USB interface connectors and cables ................................14
1.5.1.3 USB interface signals..........................................................14
1.5.2 Network interface specifications ..........................................................15
1.5.2.1 Network interface overview..................................................15
1.5.2.2 Connector and cable of network interface ..........................15
1.5.2.3 Network interface signals ....................................................15
1.5.3 Parallel interface specifications ...........................................................16
1.5.3.1 Parallel interface overview ..................................................16
1.5.3.2 Connector and cable of parallel interface............................16
1.5.3.3 Parallel interface levels .......................................................16
2. DESCRIPTION OF OPERATION............................................17
2.1 Electrophotographic process mechanism ........................................................18
2.2 Printing process................................................................................................21
3. INSTALLATION.......................................................................31
3.1 Cautions, and do’s and don’ts...........................................................................32
3.2 Unpacking procedure .......................................................................................33
3.3 Printer installation instructions .........................................................................34
3.4 List of components and accessories ................................................................35
3.5 Assembly procedure ........................................................................................36
3.5.1 Assembly of the printer main unit ........................................................36
3.5.2 Connection of the power cable ............................................................41
3.5.3
Installation and recognition confirmation of options ....................................43
3.6 Printing of the configuration report ...................................................................57
3.7 Connection methods.........................................................................................58
3.8 Checking of paper used by the user.................................................................60
4. REPLACEMENT OF PARTS...................................................61
4.1 Notes on replacement of parts..........................................................................62
4.2 Part replacement procedure .............................................................................64
4.2.1 Belt unit ................................................................................................64
4.2.2 Fuser unit .............................................................................................65
4.2.3 Left side cover......................................................................................66
4.2.4 Right side cover....................................................................................67
4.2.5 Rear cover Assy....................................................................................68
4.2.6 LED Assy..............................................................................................69
4.2.7 Main controller PCB, image drum motor, image drum lift-up motor and
feed motor ............................................................................................70
4.2.8 Print engine controller PCB.................................................................73
4.2.9 Top cover Assy......................................................................................75
4.2.10 Top cover..............................................................................................77
4.2.11 Operator panel Assy.............................................................................78
4.2.12 Board PRP ...........................................................................................79
4.2.13 Shaft-ejection Assy.(FU) and shaft-ejection Assy.(FD) .......................80
4.2.14 Guide-ejection Assy.-lower, color-registration Assy.and relay board
(P6Y)....................................................................................................81
4.2.15 Fan (fuser), high-voltage power supply board, contact Assy.,
fuser sensor Assy.................................................................................85
4.2.16 MPT Assy., MPT hopping roller, separator and pick-up roller...............87
4.2.17 Registration roller Assy.........................................................................88
4.2.18 Gear box, registration/hopping roller Assy. and solenoid......................89
4.2.19 Holder-switch Assy., low-voltage power supply fan and low-voltage
power supply ........................................................................................92
4.2.20 Belt motor Assy.and fuser motor Assy.................................................94
4.2.21 Side-R Assy.and side-L Assy...............................................................96
4.2.22 Paper feed roller (tray 1).......................................................................98

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Oki Data CONFIDENTIAL CONTENTS
4.2.23 Paper feed rollers (tray 2/3 (option))...................................................100
4.2.24 Paper feed roller (multi-purpose tray).................................................102
4.3 Portions Lubricated.........................................................................................103
5. MAINTENANCE MENUS......................................................119
5.1 System Maintenance menu (for maintenance personnel)...............................120
5.2 Maintenance Utility..........................................................................................122
5.3 User maintenance menu functions .................................................................124
5.3.1 Maintenance menu (for end-users) ....................................................124
5.3.2 Self-diagnostic mode..........................................................................127
5.3.2.1 Operator Panel..................................................................127
5.3.2.2 Normal self-diagnostic mode (level 1)...............................129
5.3.2.3 Switch scan test ................................................................130
5.3.2.4 Motor and clutch test.........................................................132
5.3.2.5 Test printing.......................................................................134
5.3.2.6 Color registration adjustment test......................................138
5.3.2.7 Density adjustment test.....................................................139
5.3.2.8 Consumable counter display.............................................141
5.3.2.9 Print counter display..........................................................142
5.3.2.10 Factory-Shipping mode switching......................................142
5.3.2.11 Self-diagnostic function setting..........................................143
5.3.2.12 LED head serial number display........................................144
5.3.2.13 NVRAM parameter setting.................................................144
5.3.3 Printing on stand-alone basis.............................................................144
5.3.4 Functions of buttons after power-on...................................................145
5.4 Setup after part replacement..........................................................................146
5.4.1 Notes on engine control board replacement.......................................146
5.4.2 EEPROM setup after CU board replacement.....................................147
5.5 Manual density adjustment setting..................................................................148
5.6 Boot Menu List................................................................................................149
6. CLEANING............................................................................151
6.1 Cleaning..........................................................................................................152
6.2 LED lens array cleaning..................................................................................153
6.3 Pick-up roller cleaning.....................................................................................155
7.TROUBLESHOOTING PROCEDURE...................................156
7.1 Before starting the repair work........................................................................157
7.2 Confirmation items before taking corrective action against abnormalities......157
7.3 Precautions when taking corrective action against abnormality .....................157
7.4 Preparation for troubleshooting.......................................................................157
7.5 Troubleshooting method..................................................................................158
7.5.1 LCD message list...............................................................................158
7.5.2 Preparation for troubleshooting ..........................................................179
7.5.2.(1) LCD display error ..............................................................180
7.5.2.(2) Abnormal operations of printer after the power is turned on182
7.5.2.(3) Paper feed jam (error code 391: 1st tray)..........................191
7.5.2.(4) Feed jam (error code 380).................................................193
7.5.2.(5) Paper feed jam (error code 390: Multipurpose tray)..........194
7.5.2.(6) Paper running jam (error code 381) ..................................196
7.5.2.(7) Paper unloading jam (error code 382)...............................198
7.5.2.(8) Two-sided printing jam
(error code: 370, 371, 372, 373, 383)................................200
7.5.2.(9) Paper size error (error code 400 and 401)........................202
7.5.2.(10) ID unit Up/Down error (Service call 140 to 143)................202
7.5.2.(11) Fuser unit error (error 170 to 177).....................................203
7.5.2.(12) Motor fan error (error code 122, 127, 128, 918, 051).......204
7.5.2.(13) Print speed is slow. (Performance is low.) .........................205
7.5.2.(14) Option unit cannot be recognized......................................205
7.5.2.(15) LED head cannot be recognized.
(error code 131, 132, 133, 134).........................................206
7.5.2.(16) Toner cartridge cannot be recognized.
(error code 540, 541, 542, 543) ........................................207
7.5.2.(17) Fuse cut error (error codes 150 to 155) ............................208
7.5.2.(18) Humidity sensor error (error code 123) .............................209
7.5.2.(19) Wiring diagram ..................................................................210
7.5.3 Troubleshooting the abnormal images................................................211
7.5.3.(1) Color has faded-out and blurred entirely.
(Refer to Figure 7-2 A.)......................................................212
7.5.3.(2) Stain on white print (Refer to Figure 7-2 B.)......................213

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Oki Data CONFIDENTIAL CONTENTS
7.5.3.(3) White print (Refer to Figure 7-2 C.)...................................214
7.5.3.(4) Black banding/black streaking in vertical direction ............215
7.5.3.(5) Cyclic abnormality (Refer to Figure 7-2 E.) ......................215
7.5.3.(6) Heavy color registration error............................................216
7.5.3.(7) Entirely black print.............................................................216
7.5.3.(8) For the entire monochrome print, it does not being printed.217
7.5.4 Network troubleshooting.....................................................................218
7.5.4.1 Connection error occurs with the Web browser.................218
7.5.4.2 Print operation is not possible ...........................................224
7.5.4.3 Cannot create Certificate...................................................225
7.5.4.4 Installation of Certificate is not possible............................225
7.5.4.5 Other questionnaires.........................................................227
7.5.4.6 Restrictions when using Internet Explore 7.......................229
7.6 Fuse check......................................................................................................230
7.7 Paper cassette switches versus Paper size correspondence table.................231
7.8 Data protection kit-A3 .....................................................................................232
7.8.1 Data protection kit-A3 (DPK-A3) overview .........................................232
8. CONNECTION DIAGRAMS..................................................236
8.1 Resistance value check..................................................................................237
8.2 Parts location..................................................................................................241
8.3 F/W version number........................................................................................251
8.3.1 ROM control number..........................................................................251
8.3.2 ROM version check and display.........................................................251
8.3.3 PCB Maintenance Indication Stamp...................................................252

Oki Data CONFIDENTIAL
1.CONFIGURATION
1.1 System configuration ...................................................................8
1.2 Printer configuration.....................................................................9
1.3 Composition of optional items ...................................................10
1.4 Specifications.............................................................................11
1.5 Interface specifications ..............................................................14

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Oki Data CONFIDENTIAL 1. CONFIGURATION
Environmental humidity
20MHz
Centronics
EEP
ROM
CC1
ASIC
CIF2
ASIC
HDD
LAN USB
CU board
Flash
ROM
Option
RAM
CU
FAN CPU
Paper feed
solenoid
Duplex
FAN Front sensor
IN
sensor
Cover-
open
sensor
Rear
sensor Bottom sensor Hopping sensor
P.E
sensor IN sensor Paper size SW
Front sensor board
DUPLEX PCB 2nd TRAY PCB
IN1 IN2 WR
M
ID M HOP M
IDUP M
BELT
Feed
clutch
Hopping
clutch
Paper feed/
transportation motor
Hopping
sensor
IN
sensor Paper size SW
P.E
sensor
2nd TRAY PCB
Feed
clutch Hopping
clutch
Paper feed/
transportation motor
Duplex
clutch
Separator
solenoid
Duplex
motor
Paper
size
SW
1st
P.E
sensor
Belt unit
Relay board
Fuser Inlet
EXIT
sensor
Fuse-
release
sensor
Fuser
entrance
sensor
Density
sensor
Color
registration
board: right
Color
registration
board: left
Belt unit,
fuse-cut
Fuser fuse-cut/
UP & LOW upper center/
upper-side for compensation/
lower thermistor
Low-voltage board
FAN, heater control,
others
Fuser entrance, release
5V, 24V, 0VL, 0VP
AC-SW
M
HEAT
Fuser-
end
cooling
FAN
Shutter
solenoid
Low-voltage
FAN
ARMORED CPU
PU board
Fuse-cut,
EXIT
Color registration,
density,
thermistor signal
FLASH
8Mbit
High-voltage I/F, FAN control,
cover-open
EEPROM
High-voltage board
RFID board
K-ID Y-ID M-ID C-ID
Fuser
FAN Belt thermistor
ID UP/
DOWN
Cover-open
sensor
Environmental
sensor
Operator panel PCB
Toner sensor board
K toner
sensor Y toner sensor M toner sensor C toner sensor ID fuse-cut
K LED HEAD
Y LED HEAD
M LED HEAD
C LED HEAD LEISUS command
I/F
DCON I/F LSYNC
1.1 System configuration
Figure 1-1 represents the system configuration of the C830.
Figure 1-1

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Oki Data CONFIDENTIAL 1. CONFIGURATION
1.2 Printer configuration
The internal part of the C830 printer is composed of the following sections:
• Electrophotographic processing section
• Paper paths
• Controllers (CU/PU)
• Operator panel
• Power supplies (high-voltage power supply/low-voltage power supply)
Figure 1-2 represents the configuration of the printer.
Figure 1-2

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Oki Data CONFIDENTIAL 1. CONFIGURATION
1.3 Composition of optional items
The following optional items are available for the C830 printer:
(1) Additional tray
型名 CAB-S1
Model name Capacity
MEM256E 256 MB
MEM512C 512 MB
(3) Cabinet
(4) Additional memory
(5) Internal hard disk
Memo Internal hard disks for C830 are incompatible with those for C5900.
(6) Data protection kit A3
(2) Duplex-Unit

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Oki Data CONFIDENTIAL 1. CONFIGURATION
1.4 Specifications
Classification Item Specification(s)
Dimension Width 485 mm
Depth 593 mm
Height 345 mm
Weight Approx. 40 kg
Line length Line length A4 LEF
Print speed Engine speed (A4) 30 PPM (color)
32 PPM (mono)
Print start First print time 9.5 sec. (mono), 10 sec. (color) (A4)
Warm-up time 90 sec.
Low-noise mode Unavailable
Resolution LED head 600dpi
Maximum input resolution 600×1200dpi
Output resolution True 600 × 1200dpi
True 600 × 600dpi
Gradation 600 × 600 dpi, four gradations
Econo mode Toner saving by decreasing brightness
CPU Core PowerPC750
I-cache/D-cache L2=256KB
Clock 700MHz
Bus width 64bit
RAM Resident 256 MB (768 MB max.)
ROM Program + font 64MB
Power
consumption Power input 120VAC±10% 230VAC±10%
Power save mode 17W or less
Idle 200W (average)
Normal operation 570W (differs depending on the use environment)
Peak 1350W
Classification Item Specification(s)
Operating
environment
(temperature)
Operating 10°C to 32°C, 17°C to 27°C (temperature for full-
color print quality guaranteed)
Non-operating 0°C to 43°C, power off
Storage (one year max.) -10°C to 43°C, with drums and toner cartridges
Transportation
(one month max.) -29°C to 50°C, with drums but no toner cartridges
Transportation
(one month max.) -29°C to 50°C, with drums and toner cartridges
Operating
environment
(humidity)
Operating 20% to 80%, 50% to 70% (humidity for full-color
print quality guaranteed)
Maximum wet-bulb temperature:25°C
Non-operating 10% to 90%, maximum wet-bulb temperature:
26.8°C, power-off
Storage
10% to 90%, maximum wet-bulb temperature:35°C
Transportation 10% to 90%, maximum wet-bulb temperature:40°C
Service life Printer life 600,000 pages (A4 LEF), five years
Print duty
(M=L/12, A=L/12/5) Maximum 50,000 pages/month Average 10,000 pages/month
MTBF (2.3% duty) Not applicable
MPBF 100,000 pages
MTTR Within 20 minutes
Toner life (based on ISO/
IEC 19798) Starter toner (supplied with the C830): 2,300 pages (black)
2,300 pages (color)
Standard: 7,000 pages (black)
7,000 pages (color)
S type: 2,500 pages (black)
2,500 pages (color)
1st new drum:Approx.5,200 pages (standard type)
Approx. 1,200 pages (S type)
Image drum life 20,000 pages (3 pages/job)
11,000 pages (1 page/job)
27,000 pages (when printed continuously)
Drum counter automatic reset

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Oki Data CONFIDENTIAL 1. CONFIGURATION
Classification Item Specification(s)
Service life Transfer belt life 80,000 pages (A4 LEF, 3 pages/job),
counter automatic reset
Fuser unit life 100,000 pages (A4), counter automatic reset
Operation
noise Operating 54 dBA (ISO 7779 Front) (without any optional unit)
Standby 37 dB (ISO 7779 Front)
Power save mode Background level
Paper
handling Tray capacity (1st tray) Legal/universal cassette:300 sheets (70 kg)
Tray capacity (2nd/3rd
tray) Legal/universal cassette (option): 530 sheets (70 kg)
Tray capacity (manual/
auto) Standard multipurpose tray: 100 sheets (70 kg) or 10 envelopes
Paper ejection 250 sheets (70 kg) to the face down stacker,
100 sheets (70 kg) to the face-up stacker
Duplex Standard
Paper size A3, A4, A5, A6*, B4, Letter, Legal (13/13.5/14
inches), Executive, postcard**, double-postcard**,
Custom***, envelope (Choukei 3,Youkei 0,Youkei
4, Kakugata 2, Kakugata 3.)
*: A6 size paper cannot be printed from trays 2
and 3.
**: Postcards and double-postcards can be
printed only from the MPT.
***: As for Custom, the available size differs
depending on trays.
Minimum
paper size Tray 1 A6
Tray 2,Tray 3 (options) A5
MPT Postcard
Media
weight Tray 1 64 g/m2to 120 g/m2
Tray 2,Tray 3 (options) 64 g/m2to 175 g/m2
MPT 64 g/m2to 200 g/m2
Classification Item Specification(s)
Operator
panel LCD Graphic panel with 128 × 64 dots, no display of paper size
LED (color) 2 LEDs (green × 1, dark amber × 1)
Switch 8 switches
Status
switch/
sensor
Paper out Provided
Paper low Not provided
Toner low Provided (Y, M, C, K)
Cover open Provided
Fuser temperature Provided
Paper size Provided (manual setting)
Stacker full Not provided
Communica-
tion interface Standard (on-board) • High-speed USB • Ethernet
• Parallel interface
Option N/A
Input/output switch Automatic
Emulation Standard PCL (PCL5c, HP-GL) / PCL XL 2.1
PostScript 3 (Clone)
Emulation switch Automatic
Font Bit-map typeface Provided
Scalable font Provided
Rasterizer Provided
Barcode Provided
OCR Provided
Japanese PCL font Provided
Japanese PS font Provided

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Oki Data CONFIDENTIAL 1. CONFIGURATION
Classification Item Specification(s)
Option
(removable) RAM 256/512 MB DIMM
User-installable 2.5” IDE
HDD • Standard internal hard disk • Data protection kit A3
Tray configuration 2nd tray and 3rd tray
Cassette Universal (530 sheets)
Duplex unit Provided
Long-sheet supporter Not provided
Others Unavailable
Factory
setting Japan PCL + PS model
Other USB-IF logo Provided
Windows logo Provided
Operation with UPS or
inverter Proper operation by use of a UPS (uninterruptible power supply) or an inverter
is not guaranteed.Do not use a UPS and an
inverter.

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Oki Data CONFIDENTIAL 1. CONFIGURATION
1.5 Interface specifications
1.5.1 USB interface specifications
1.5.1.1 USB interface overview
(1) Basic specifications
USB (Hi-Speed USB supported)
(2) Transmission mode
Full speed (Max.12 Mbps ± 0.25%)
High speed (Max.480 Mbps ± 0.05%)
(3) Power control
Self-powered 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 arrangement
(2) Cables
Length: USB 2.0 cables no more than five meters long (two meters or less
recommended)
(Shielded USB 2.0 cables shall be used.)
1.5.1.3 USB interface signals
Signal name Function
1 Vbus Power (+5V)
2 D- For data transfer
3 D+ For data transfer
4 GND Signal ground
Shell Shield
• Cable side: B-plug (male)
2
3 4
1

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Oki Data CONFIDENTIAL 1. CONFIGURATION
1.5.2 Network interface specifications
1.5.2.1 Network interface overview
Basic specifications
TCP/IP spec. Network layer
ARP, IP, ICMP, IPv6
Transport layer
TCP, UDP
Application layer
LPR, Port9100, FTP, HTTP, HTTPS, IPP, SNMPv1/v3,TELNET,
DHCP/BOOTP, DNS, DDNS, WINS, UPnP, Bonjour, SNTP, SMTP,
POP,Windows Rally (WSD Print, LLTD)
NetBEUI: SMB, NetBIOS
NetWare: Remote printer mode (maximum eight print servers)
Print server mode (maximum eight file servers, 32 queues)
Support of encrypted passwords (in print server mode)
NetWare 6J/5J/4.1J (NDS, bindery)
SNMP
EtherTalk: ELAP, AARP, DDP, AEP, NBP, ZIP, RTMP, ATP, PAP
IEEE 802.1X: EAP-TLS, PEAP
(2) Cable
Non-shield twisted-pair cable with RJ-45 connector (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
1.5.2.2 Connector and cable of network interface
(1) Connector
100BASE-TX/10 BASE-T (automatically switched, not usable simultaneously)
Connector pins arrangement

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Oki Data CONFIDENTIAL 1. CONFIGURATION
1.5.3 Parallel interface specifications
1.5.3.1 Parallel interface overview
Item Details
Supported modes Compatible mode, nibble mode, ECP mode
Data bit length Compatible mode: 8 bit, Nibble mode: 4 bit, ECP mode: 9 bit
1.5.3.2 Connector and cable of parallel interface
(1) Connector
Printer side: 36-pole connector (female)
Product equivalent to 57LE-40360-12 (D56) (DDK Ltd.)
Cable side: 36-pole connector (male)
Product equivalent to 57FE-30360-20N (D8) (DDK Ltd.)
Pin arrangement on the interface cable side
(2) Cable
Use a cable of 1.8 m or less.
(Use a shielded twisted-pair cable for noise prevention.)
1.5.3.3 Parallel interface levels
Low level: 0.0V to +0.8V
High level: +2.4V to +5.0V
118
1936

Oki Data CONFIDENTIAL
2.DESCRIPTION OF OPERATION
2.1 Electrophotographic process mechanism ..................................18
2.2 Printing process..........................................................................21

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Oki Data CONFIDENTIAL 2. DESCRIPTION OF OPERATION
(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 backside 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. Belt cleaning
The belt cleaning blade removes toner remaining on the belt.
7. Fusing
Heat and pressure are applied to the toner image on the paper to promote its
fusion.
2.1 Electrophotographic process mechanism
(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.
(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.
-
--
--
-
Power
supply
unit
Charging roller
OPC drum
-
--
--
---
-
Power
supply
unit
OPC drum
Paper
LED head
OPC drum
LED head
Charging roller

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Oki Data CONFIDENTIAL 2. DESCRIPTION OF OPERATION
(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.
(5) Transfer
A sheet of paper is placed over the OPC drum surface, and an electric charge is
given to the paper from its backside 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.
-
--
--
---
-
-
--
Development roller Sponge roller
OPC drum
Charging roller
-
--
--
---
-
-
--
--
-
+-
+-
+
-
+
-
+
-
+- +- +- +- +- +
-
+- +
-
+- +
-
+- +
Power
supply
unit
OPC drum
Transfer roller
Paper
Transport belt