Oki C310dn User manual

Oki Data CONFIDENTIAL
BOM Use for Certification Body
Rev Date DCO No. Contents Design Approval
Approval TsutomuYamamoto Design S Ogashiwa Name
C310dn, C330dn, C510dn, C530dn
Maintenance Manual
Check
Date 2010-06-18 Drawing No.44346001TH 1
220
C310dn, C330dn, C510dn, C530dn
Maintenance Manual
[Rev. 1]
Related drawings
Drawing No. Name
44346007TL C310dn, C330dn, C510dn, and C530dn Disassembly for Maintenance
44346007TR C310dn, C330dn, C510dn, and C530dn RSPL
No.01
More Service Manuals at www.service-manual.net

44346001TH Rev.1  /
Oki Data CONFIDENTIAL
Document Revision History
Rev.
No. Date
Changed items
Person in charge
No. Page Description of change
1 2010-06-18 Issue S. Ogashiwa
Rev.
No. Date
Changed items
Person in charge
No. Page Description of change
Document Revision History

44346001TH Rev.1 3 /
Oki Data CONFIDENTIAL
This manual explains the maintenance methods for the C310dn, C330dn, C510dn, and
C530dn printers.
The manual has been prepared for use by the maintenance personnel. For how to operate
the C310dn, C330dn, C510dn, and C530dn printers, refer to the corresponding user’s
manual.
These printer names may be given as follows in this manual.
C310dn C310
C330dn C330
C510dn C510
C530dn C530
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 repairs,
adjustment, or modifications of the printers conducted by the users using
this manual.
• The parts employed in the C310dn, C330dn, C510dn, and C530dn printers
are so delicate that they may be damaged if not treated properly. Oki Data
Corporation highly recommends that the maintenance of the printers is
undertaken by ODC's registered maintenance personnel.
• Work after eliminating static electricity.
PREFACE
はじめに

44346001TH Rev.1 4 /
Oki Data CONFIDENTIAL
CONTENTS
CONTENTS
1. CONFIGURATION.....................................................................6
1.1 System configuration ............................................................................................7
1.2 Printer configuration ..............................................................................................9
1.3 Optional items .....................................................................................................10
1.4 Specifications ......................................................................................................11
1.5 Interface specifications ........................................................................................13
1.5.1 USB interface specifications .........................................................................13
1.5.1.1 USB interface overview..........................................................................13
1.5.1.2 USB interface connector and cable .......................................................13
1.5.1.3 USB interface signals ............................................................................13
1.5.2 Network interface specifications ...................................................................14
1.5.2.1 Network interface overview....................................................................14
1.5.2.2 Network interface connector and cable..................................................14
1.5.2.3 Network interface signals ......................................................................14
2. DESCRIPTION OF OPERATION ............................................15
2.1 Electrophotographic process mechanism ...........................................................16
2.2 Printing process...................................................................................................20
3.INSTALLATION.........................................................................32
3.1 Cautions, and do’s and don’ts..............................................................................33
3.2 Unpacking procedure ..........................................................................................34
3.3. Printer installation instructions ...........................................................................35
3.4 List of components and accessories ...................................................................36
3.5 Assembly procedure ...........................................................................................37
3.5.1 Assembly of the printer main unit .................................................................37
3.5.2 Connection of the power cable .....................................................................41
3.5.3 Installation and recognition confirmation of an option ..................................43
3.6 Printing of MenuMap ...........................................................................................53
3.7 Connection methods............................................................................................54
3.8 Checking of paper used by the user ....................................................................56
4.REPLACEMENT OF PARTS....................................................57
4.1 Notes on replacement of parts.............................................................................58
4.2 Part replacement procedure ................................................................................60
4.2.1 Belt unit..........................................................................................................60
4.2.2 Fuser unit.......................................................................................................61
4.2.3 Left side cover ...............................................................................................61
4.2.4 Right side cover.............................................................................................62
4.2.5 Face-up tray...................................................................................................62
4.2.6 Rear cover.....................................................................................................63
4.2.7 LED assembly. and LED assembly springs ...................................................63
4.2.8 Image drum fan and ZHJ board.....................................................................64
4.2.9 CU/PU PCB and low-voltage power supply...................................................64
4.2.10 Top cover assembly.....................................................................................66
4.2.11 Top cover and LED head cable assembly....................................................66
4.2.12 Operator panel assembly.............................................................................67
4.2.13 Board IBB and LCD.....................................................................................67
4.2.14 MPT assembly.............................................................................................68
4.2.15 Front fan, hopping motor, rear fan, image drum motor and
cover-open switch........................................................................................69
4.2.16 High-voltage power supply board................................................................70
4.2.17 Guide-ejection assembly, fuser connector assembly and
color-registration assembly .........................................................................71
4.2.18 Frame-MPT assembly and feeder assembly..............................................72
4.2.19 Side-L assembly, side-R assembly and base assembly ⑦........................73
4.2.20 Feed rollers..................................................................................................74
4.3 Locations to lubricate...........................................................................................75

44346001TH Rev.1 5 /
Oki Data CONFIDENTIAL CONTENTS
5. MAINTENANCE MENUS.........................................................87
5.1 System Maintenance menu (for maintenance personnel)....................................88
5.2 Maintenance Utility...............................................................................................90
5.3 User maintenance menu functions ......................................................................92
5.3.1 Maintenance menu (for end-users)................................................................92
5.3.2 Self-diagnostic mode.....................................................................................93
5.3.3 Various types of printing on stand-alone basis............................................110
5.3.4 Button functions at power-on.......................................................................111
5.4 Setup after part replacement.............................................................................112
5.4.1 Notes on CU/PU board replacement...........................................................112
5.5 Manual density adjustment operation................................................................114
5.6 Printer ADMIN MENU........................................................................................115
6. PERIODIC MAINTENANCE ..................................................118
6.1 Cleaning.............................................................................................................119
6.2 LED lens array cleaning.....................................................................................120
6.3 Pick-up roller cleaning........................................................................................122
6.4 Pinter internal cleaning ......................................................................................123
7.TROUBLESHOOTING............................................................125
7.1 Before troubleshooting.......................................................................................126
7.2 Points to check before dealing with image troubles...........................................126
7.3 Precautions for dealing with image troubles ......................................................126
7.4 Preparation for troubleshooting..........................................................................126
7.5 Troubleshooting procedure.................................................................................127
7.5.1 LCD messages list.......................................................................................127
7.5.2 Preparation for troubleshooting ...................................................................148
7.5.3 Troubleshooting of image problems ............................................................180
7.5.4 Network troubleshooting .............................................................................187
7.5.4.1 Connection errors occur by use of a Web browser
(C330dn/C530dn only) ....................................................................187
7.5.4.1.1 Has a certificate been created?....................................................188
7.5.4.1.2 Is the SSL/TLS setting set to ON?................................................188
7.5.4.1.3 Check the version number of the Web browser............................189
7.5.4.1.4 Check the encryption strength of the printer.................................190
7.5.4.2 Print operation is not possible (C330dn/C530dn only) ........................193
7.5.4.2.1 Check the OS (Operating System)...............................................193
7.5.4.2.2 Has a printer been created?.........................................................193
7.5.4.2.3 Is the IPP setting set to Enable? ..................................................193
7.5.4.3 A certificate cannot be created.(C330dn/C530dn only) ......................194
7.5.4.3.1 Not all the required entry fields are filled in. .................................194
7.5.4.3.2 The printer is printing....................................................................194
7.5.4.4 A certificate cannot be installed.(C330dn/C530dn only).................194
7.5.4.4.1 The printer IP address has been changed. ..................................194
7.5.4.4.2 The network card has been initialized. .........................................195
7.5.4.4.3 A CSR has been deleted..............................................................195
7.5.4.4.4 Install an intermediate Certificate. ...............................................195
7.5.4.5 Other questions (C330dn/C530dn only) ..............................................196
7.5.4.5.1 Time required for creation of a certificate.....................................196
7.5.4.5.2 Communication time when the encryption function is enabled.....196
7.5.4.5.3 Can encrypted printing be performed without IPP?......................196
7.5.4.5.4 What will happen if SSL/TLS is set to OFF after a certificate is
created (or installed)?...................................................................196
7.5.4.5.5 How to change the port number...................................................196
7.5.4.5.6 The error message “The security certificate was issued by a
company you have not chosen to trust.View the certificate to
determine whether you want to trust the certifying authority” is
displayed.......................................................................................196
7.5.4.5.7 The error message “Name of security certificate is invalid or does
not match the site name” is displayed...........................................197
7.5.4.6 Restrictions when using Internet Explore 7 (C330dn/C530dn only) .198
7.5.4.6.1 Warning indication when SSL is enabled for self-signed
certificates ....................................................................................198
7.6 Fuse check.........................................................................................................199
8. CONNECTION DIAGRAMS .................................................200
8.1 Resistance value checking ................................................................................201
8.2 Layout of parts ..................................................................................................204
8.3 Firmware revision numbers ...............................................................................218
8.3.1 ROM control numbers..................................................................................218
8.3.2 Checking and indication of the revision number .........................................219
8.3.3 Stamp of maintenance board indication .....................................................219

Oki Data CONFIDENTIAL
1.
CONFIGURATION
1.1 System configuration ......................................................................7
1.2 Printer configuration .......................................................................9
1.3 Optional items ...............................................................................10
1.4 Specifications ...............................................................................11
1.5 Interface specifications .................................................................13

44346001TH Rev.1 7 /
Oki Data CONFIDENTIAL 1. CONFIGURATION
1.1 System configuration
K toner
sensor
C toner
sensor
Paper
feed
motor
MPT
clutch
ID
motor
Fuser
motor
WR sensor
ID UP/
DOWN sensor
ID
FAN
C LED HEAD
M LED HEAD
Y LED HEAD
K LED HEAD
USB
LAN
CUPU
CD1
ASIC(/)
CD1
ASIC(1/)
EEP
ROM
Flash
ROM
Resident
RAM
Option
RAM
Optional SD
memory card
(C530 only)
Fuser
Inlet
Low-voltage board
AC-SW
Toner sensor board
High-voltage board
Operator
panel board
Waste toner
sensor board
Color registration
sensor board
Density sensor
nd TRAY PCB
Belt unit
K-ID C-ID M-ID Y-ID
Rear
cover SW
1st P.E
sensor
Hopping
sensor
Hopping
clutch
Rear
FAN
Front
FAN
1st cassette
sensor
M toner
sensor
Y toner
sensor ID fuse
cut
Belt unit
fuse-cut
Duplex
rear sensor
Belt
thermistor
Duplex
front sensor
IN sensor
Cover-open
SW
EXIT
sensor
Duplex
clutch
Shutter
solenoid BELT
motor
Environmental
sensor
EEP
ROM
High-voltage
I/F
Heater power
3.3V,5V,4V,0VL,0VP
Fuser fuse-cut/upper center/for
compensation/lower thermistor
TAG I/F
CU/PU board
nd IN
sensor
nd
paper feed
motor
nd
ﾎｯﾋﾟﾝｸﾞ
ｸﾗｯﾁ
nd
registration
clutch
Heater control,
others
nd P.E
sensor
nd
hopping
sensor
TAG
board
TAG
board
TAG
board
TAG
board
Registration
clutch
nd hopping clutch
Figure 1-1-1 and Figure 1-1-2 show the system configurations of the C310dn, C330dn
C510dn and C530dn printers.
Figure 1-1-1 System Configuration Diagram (C530/C330)

44346001TH Rev.1  /
Oki Data CONFIDENTIAL 1. CONFIGURATION
K toner
sensor C toner sensor
Paper
feed
motor
MPT
clutch
ID
motor
Fuser
motor
WR sensor
ID UP/
DOWN sensor
ID
FAN
C LED HEAD
M LED HEAD
Y LED HEAD
K LED HEAD
USB
LAN
CUPU
EEP
ROM
Flash
ROM
Resident
RAMOption
RAM
Optional SD
memory card
(C530 only)
Fuser
Inlet
Low-voltage board
AC-SW
Toner sensor board
High-voltage board
Operator
panel board
Waste toner
sensor board
Color registration
sensor board
Density sensor
2nd TRAY PCB
Belt unit
K-ID C-ID M-ID Y-ID
Rear
cover SW
1st P.E
sensor
Hopping
sensor
Hopping
clutch
Rear
FAN
Front
FAN
1st cassette
sensor
M toner
sensor Y toner sensor ID fuse
cut
Belt unit
fuse-cut
Duplex
rear sensor
Belt
thermistor
Duplex
front sensor
IN sensor
Cover-open
SW
EXIT
sensor
Duplex
clutch
Shutter
solenoid BELT
motor
Environmental
sensor
EEP
ROM
High-voltage
I/F
Heater power
3.3V,5V,24V,0VL,0VP
Fuser fuse-cut/upper center/for
compensation/lower thermistor
TAG I/F
CU/PU board
2nd IN
sensor 2nd
paper feed
motor
2nd
registration
clutch
Heater control,
others
2nd P.E
sensor
2nd
hopping
sensor
2nd
hopping
clutch
TAG
boardTAG boardTAG boardTAG board
Registration
clutch
SPL
ASIC(/)
SPL
ASIC(1/)
Figure 1-1-2 System Configuration Diagram (C510/C310)

44346001TH Rev.1  /
Oki Data CONFIDENTIAL 1. CONFIGURATION
1.2 Printer configuration
The internal part of the C310dn, C330dn, C510dn, and C530dn printers consists 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 shows the configuration of the printers.
Figure 1-2

44346001TH Rev.1 10 /
Oki Data CONFIDENTIAL 1. CONFIGURATION
1.3 Optional items
The following optional items are available for the C310dn, C330dn, C510dn, and
C530dn printers:
(1) Optional tray (2nd Tray)
(2) Additional memory (C530 only)
(3) SD memory card (C530 only)
(authentication printing, encrypted secure printing)

44346001TH Rev.1 11 /
Oki Data CONFIDENTIAL 1. CONFIGURATION
1.4 Specifications
C530dn C510dn C330dn C310dn
Printing
system Xerographic method using LEDs (light emitting diodes) as light sources
Resolution 600 dots/inch (LED head)
600 × 600 dpi/600 × 1200 dpi/600 × 600 dpi × 2 bits (print resolution)
Print color Four colors of yellow, magenta, cyan, and black
CPU Power PC
RAM
capacity 256 MB (Max. 756 MB) 64 MB 128 MB (Max. 640 MB) 64 MB
Supported
OSes Windows Vista/
Windows Server
2008/Windows
XP/Windows
Server 2003/
Windows 2000
Japanese
Version
Mac OS 9.0
to 9.2.2, Mac
OS X 10.3.9 to
10.5 Japanese
Version
See the system
requirements
for further
information.
Windows Vista/Windows Server 2008/Windows XP/
Windows Server
2003/Windows 2000 JapaneseVersion
Mac OS X 10.3.9 to 10.5 JapaneseVersion
See the system requirements for further information.
Print
languages PostScript3 emulation
PCL5c/PCL XL
emulation
Hiper-C PostScript3
emulation
PCL5c/PCL XL
emulation
Hiper-C
Internal
fonts -
Interface USB (supporting Hi-Speed USB), 100BASE-TX/10BASE-T
C530dn C510dn C330dn C310dn
Print speed
*1
(at 600 ×
600 dpi or
600 × 1200
dpi)
Color:
26 pages/minute (A4-size plain
paper in copy mode),
10 pages/minute (postcards and
label stocks),
12 pages/minute (177g/m2 [152kg]
or more thick paper),
14 pages/minute (duplex printing
on A4 plain paper)
Monochrome:
30 pages/minute (A4 plain paper in
copy mode),
10 pages/minute (postcards and
label stocks),
16 pages/minute (duplex printing
on A4 plain paper)
Color:
22 pages/minute (A4-size plain
paper in copy mode),
10 pages/minute (postcards and
label stocks),
12 pages/minute (189g/m2
[163kg] or more thick paper),
12 pages/minute (duplex printing
on A4 plain paper)
Monochrome:
24 pages/minute (A4 plain paper
in copy mode),
10 pages/minute (postcards and
label stocks),
13 pages/minute (duplex printing
on A4 plain paper)
Color:
22 pages/minute (A4-size plain
paper in copy mode),
10 pages/minute (postcards and
label stocks),
12 pages/minute (189g/m2
[163kg] or more thick paper),
12 pages/minute (duplex printing
on A4 plain paper)
Monochrome:
24 pages/minute (A4 plain paper
in copy mode),
10 pages/minute (postcards and
label stocks),
13 pages/minute (duplex printing
on A4 plain paper)

44346001TH Rev.1 1 /
Oki Data CONFIDENTIAL 1. CONFIGURATION
C530dn C510dn C330dn C310dn
Paper size
*2 A4, A5, A6, B5, Letter, Legal 13 inch, Legal 13.5 inch, Legal 14 inch, Executive, 16K (184 × 260 mm), 16K (195 × 270 mm), 16K (197 × 273
mm), Custom, Postcard, Double-postcard, Envelope, Index Card
Paper type
*2 Plain paper (64g/m2 [55kg] to 220g/m2 [151kg]), Postcard, Envelope, Labels
Feed type *2 Automatic feeding byTray 1
Automatic feeding by or manual feeding from the multi-purpose tray
Automatic feeding by a second tray unit (option)
Automatic
feeding by a
second tray
unit (option)
Tray
capacity
Tray1: 280 sheets of 64g/m2 (55kg) plain paper, 25mm or less in total
thickness
Multi-purpose tray: 110 sheets of 64g/m2 (55kg) plain paper, 10mm
or less in total thickness, 40 postcards, 10
envelopes of 85g/m2 paper
Second tray unit (option):580 sheets of 64g/m2 (55kg) plain paper, 53
mm or less in total thickness
Paper
ejection *2 Face-up (ejecting paper with the front side up)/Face-down (ejecting paper with the back-side up)
Stacker
capacity *3 Face-up: 110 sheets of 64g/m2 (55kg) plain paper Face-down:150 sheets of 64g/m2 (55kg) plain paper
Assured
print area Area excluding 6.35mm from paper edges (except special media such as envelopes)
Print
accuracy Print start position accuracy:±2mm, Paper skew:±1mm/100mm Image expansion:±1mm/100mm (in use of 82g/m2 of 70kg paper)
Warm-up
time In 60 sec. after power on (25°C) *4 Within 32 sec. from power saving
Power AC 100V ± 10%, 50/60Hz ± 2%
C530dn C510dn C330dn C310dn
Power
consumption
*5
Operating:
Max. 1170W,
Average 540W
(25°C)
Ready:
Average 90W
(25°C)
Power save
mode:
Max. 14W
Sleep mode:
Approx. 0.9W
Operating:
Max. 1170W,
Average 540W
(25°C)
Ready:
Average 80W
(25°C)
Power save
mode:
Max. 9.5W
Sleep mode:
Approx. 1.8W
Operating:
Max. 1170W,
Average 480W
(25°C)
Ready:
Average 90W
(25°C)
Power save
mode:
Max. 14W
Operating:
Max. 1170W,
Average 480W
(25°C)
Ready:
Average 80W
(25°C)
Power save
mode:
Max. 9.5W
Inrush
current 70A or less (25°C)
Operating
environment
conditions
Operating: 10 to 32°C, 20 to 80% RH (max. wet-bulb temperature:25°C,
max. wet- and dry-bulb temperature difference:2°C)
Non-operating: 0 to 43°C, 10 to 90% RH (max. wet-bulb temperature:
26.8°C, max.wet -and dry-bulb temperature difference:2°C)
Print quality
assured
conditions
30 to 73% RH at 10°C, 30 to 54% RH at 32°C, 10 to 32°C at 30% RH, 10
to 27°C at 80% RH, 17 to 27°C at 50 to 70% RH in color printing
Standard
operating
conditions
Average power–on hours: 600 hours/month
Average number of printed pages:6,000 pages/month
Consumables,
maintenance
units
Toner cartridges, image drum units, belt units, fuser units, feed roller sets
Printer life 5 years or 420,000 pages (A4) 5 years or 300,000 pages (A4)
Total weight
*6 Approx. 22kg
*1: Print speed varies depending on sizes, types and thickness of paper and paper feed
types.
*2: There are limitations on paper feed types and paper ejection types depending on
paper sizes, types and thickness.
*3: The stacker capacities may different from the specifications depending on operating

44346001TH Rev.1 13 /
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 connector and cable
(1) Connector
• Printer side: B-receptacle (female)
Upstream port
Product equivalent to UBR24-4K5C00 (Made by ACON)
Connector pin arrangement
((2) Cable
Length:USB 2.0 cable no more than five meters long
(two meters or less recommended)
(A shielded USB 2.0 cable shall be used.)
1.5.1.3 USB interface signals
Signal name Function
1 Vbus Power (+5V)
2 D- For data transmission
3 D+ For data transmission
4 GND Signal ground
Shell Shield
• Cable side: B-plug (male)
2
34
1

44346001TH Rev.1 14 /
Oki Data CONFIDENTIAL 1. CONFIGURATION
1.5.2 Network interface specifications
1.5.2.1 Network interface overview
Basic specifications
Network protocols (*:C330dn/C530dn only)
TCP/IP spec. Network layer
ARP, IP, ICMP, IPv6*, IPSec*
Transport layer
TCP, UDP
Application layer
LPR, Port9100, FTP, HTTP, HTTPS*, IPP, SNMPv1, SNMPv3*,
TELNET, DHCP/BOOTP, DNS, DDNS, WINS, UPnP, Bonjour,
SNTP, SMTP, POP*, Windows Rally (WSD Print, LLTD)
NBT/NetBEUI*: SMB, NetBIOS, NetBIOS over TCP
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 
1.5.2.2 Network interface connector and cable
(1) Connector
100BASE-TX/10 BASE-T (automatically switched, not usable simultaneously)
Connector pin arrangement

Oki Data CONFIDENTIAL
2.
DESCRIPTION OF OPERATION
2.1 Electrophotographic process mechanism .....................................16
2.2 Printing process.............................................................................20

44346001TH Rev.1 16 /
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 surface in
accordance with an 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. Fusing
Heat and pressure are applied to the toner image on the paper to promote
its fusion.
6. Drum cleaning
The drum cleaning blade removes toner remaining on the OPC drum after
transfer.
7. Static elimination
Residual potential on the image drum is removed.
8. Belt cleaning
The belt cleaning blade removes toner remaining on the belt.
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 OPC drum
surface.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
Paper
OPC drum OPC drum
LED head
LED head
Charging roller
-
--
--
-
Power
supply unit
Charging roller
OPC drum

44346001TH Rev.1 17 /
Oki Data CONFIDENTIAL 2. DESCRIPTION OF OPERATION
(4) Development
Toner adheres to an 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 developing 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 supply unit, 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, and the toner is attracted
to the paper surface from the OPC drum surface.
-
--
--
---
-
-
--
Developing roller Sponge roller
OPC drum
Charging roller
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Power
supply unit
OPC drum
Transfer roller
Paper
Transport belt

44346001TH Rev.1 1 /
Oki Data CONFIDENTIAL 2. DESCRIPTION OF OPERATION
(6) Fusing
The toner image transferred on the paper is fused on the paper by heat and
pressure when the paper passes through the heat roller and the backup roller unit
(consists of a backup roller, a pat, and a fuse belt).
The heat roller is heated by 800W and 300W internal halogen lamps, and the
backup roller has no internal halogen lamps and is heated by heat transferred from
the heat roller. The fuser temperature is controlled according to the temperature
that is detected with the thermistor not contacting to the heat roller surface. The
temperature detected with the other thermistor that is frictionally sliding against the
backup roller surface is used to control the fuser temperature under designated
conditions. There is also a thermostat for safety purposes. When the heat roller
temperature rises above a certain temperature, the thermostat is open and voltage
supply to the heater is cut off.The backup roller unit is pressed against the heater
by the press spring on both sides.
(7) 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 K toner cartridge.
Heat roller
Backup roller
Pat
Thermistor
Thermistor
Paper
Paper transfer direction
Thermostat
Fuser belt
Waste toner area
Toner cartridge
ID unit
Drum cleaning
blade
waste toner of waste toner path
(8) Static elimination
After completing transfer, the OPC drum is illuminated with its surface to reduce
static charge of its surface.
Charging roller
Static-eliminating
Static-eliminating
OPC drum

44346001TH Rev.1 1 /
Oki Data CONFIDENTIAL 2. DESCRIPTION OF OPERATION
(9) Belt cleaning
Toner remaining on the transfer belt is scraped off by the belt cleaning blade and
collected into the waste toner box of the transfer belt unit.
Belt waste toner box
Transport belt
Belt cleaning blade

44346001TH Rev.1 0 /
Oki Data CONFIDENTIAL 2. DESCRIPTION OF OPERATION
2.2 Printing process
Paper fed from Tray 1, Tray 2 or Tray 3 is carried by the paper feed roller, the registration roller L,
and the transport roller.When paper is fed from the MPT, it is carried by the MPT paper feed roller
and the registration roller U. Then, an unfixed toner image is created on the paper transported
onto the belt sequentially through the electrophotographic process of KYMC.
Thereafter, the image is fixed under heat and pressure as the paper goes through the fuser
unit. After the image has been fixed, the paper is ejected to a face-up stacker or to a face-down
stacker, according to the outputting method selectedby opening or closing of the face-up stacker.
The above refers to the simplex printing operation of the printers, and the following explains the
duplex printing operation.
During duplex printing, paper, which firstly passes the fuser unit after its backside is printed, is
sucked into the duplex unit by the separator DUP. After entering the paper reverse transport path,
the paper is carried from there to the inside of the duplex unit by the inverting operation of the
reverse roller. After passed through the duplex unit by the transport roller that is located on the
transport path inside the duplex unit, the paper is fed along the paper feed route of the duplex unit,
and then arrives the route for paper feeding from a tray.From here on, the same operation as that
of simplex printing of paper fed from the tray takes place.
Top cover
Paper exit
Face-up stacker
Paper cassette
Front cover
Fuser unit
YMCK
Second tray unit (option)