Oki C710 User manual

Maintenance Manual
072710C
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C710/MPS710
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Copyright Information
Copyright © 2010 by 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

43856301TH Rev.3 2 /
Oki Data CONFIDENTIAL
Document Revision History
Rev.No Date Corrected items Person in
charge
No. Page Description of change
1 2008-05-07 Issue CSFP11 N. Sunaga
2 2008-11-25 61, 73 Addition of “Warning”,
etc. EP5 T. Sugiyama
3 2009-01-09 Drawing Maintenance EP5 Y. Fujisawa
Rev.No Date Corrected items Person in
charge
No. Page Description of change

43856301TH Rev.3 3 /
Oki Data CONFIDENTIAL
This manual provides an overview of method for maintaining the C710n.
This manual is intended for maintenance staff.For more information about how to operate
the C710n, please refer to User 's manual.
Note! • Manual may be revised and updated at any time without notice.
• Unexpected mistakes may exist in the manual.
OKI will not assume any responsibility whatsoever for damage to the
equipmentrepaired/adjusted/changed by the user etc with this manual.
• The parts used for this printer may be damaged when handling
inappropriately.We strongly recommend maintaining this machine
by our registration maintenance staff.
• Please operate the machine after removing static electricity.
PREFACE

43856301TH Rev.3 4 /
Oki Data CONFIDENTIAL
Index
1. Configuration...........................................................................6
1.1 System configuration............................................................................................7
1.2 The Configuration of printer..................................................................................8
1.3 Optional parts.......................................................................................................9
1.4 Specifications .....................................................................................................10
1.5 Specification of interface ....................................................................................13
1.5.1 Specification of USB interface ....................................................................13
1.5.1.1 General of USB interface.....................................................................13
1.5.1.2 Connector and cable of USB interface.................................................13
1.5.1.3 USB interface signal............................................................................13
1.5.2 Specification of network interface...............................................................14
1.5.2.1 General of network interface................................................................14
1.5.2.2 Connector and cable of network interface...........................................14
1.5.2.3 Signal of network interface ..................................................................14
1.5.3 Specification of parallel interface................................................................15
1.5.3.1 General of parallel interface.................................................................15
1.5.3.2 Connector and cable of parallel interface ............................................15
1.5.3.3 Parallel interface level..........................................................................15
1.5.3.4 Signal of interface................................................................................15
2. Operating instructions..........................................................16
2.1 Electrophotographic processing mechanism......................................................17
2.2 Printing process..................................................................................................21
3. Set up .....................................................................................32
3.1 Notes and precautions........................................................................................33
3.2 Unpack method ..................................................................................................34
3.3 Setting method ...................................................................................................35
Set space................................................................................................................35
3.4 List of equipments and accessories ...................................................................36
3.5 Assembling method............................................................................................37
3.5.1 Assemble the main body of the printer .......................................................37
3.5.2 Cable connect.............................................................................................43
3.5.3 Optional part installation and confirmation..................................................45
3.6 Setting content print (Configuration)...................................................................56
3.7 Connecting method ............................................................................................57
3.8 User used Paper confirmation............................................................................59
4. Component replacement......................................................60
4.1 Precautions on component replacement............................................................61
4.2 Method of component replacement....................................................................63
4.2.1 Belt unit.......................................................................................................63
4.2.2 Fuser unit....................................................................................................64
4.2.3 Left side cover.............................................................................................64
4.2.4 Right side cover..........................................................................................65
4.2.5 Faceup tray ................................................................................................65
4.2.6 Rear cover...................................................................................................66
4.2.7 LED Assy/ LED Assy spring........................................................................66
4.2.8 Control PCB................................................................................................67
4.2.9 Print engine controller PCB.........................................................................68
4.2.10 Top cover Assy............................................................................................69
4.2.11 Top cover ....................................................................................................70
4.2.12 Control panel Assy .....................................................................................70
4.2.13 Board PRG/ LCD........................................................................................71
4.2.14 Frame panel Assy.......................................................................................72
4.2.15 Low voltage power supply/Low voltage FAN/ Hopping motor/
Fuse motor..................................................................................................73
4.2.16 Guide eject Assy/ Color resist Assy/ Board-PRY........................................74
4.2.17 FAN(Fuser) / Belt motor/ High-voltage board/ Cover open switch..............75
4.2.18 MPT Assy...................................................................................................75
4.2.19 Feeder unit/ Board-RSF/MPT hopping roller/ Frame Assy separator/
Cover front ..................................................................................................76
4.2.20 Board-PRZ liftup motor/ Hopping motor/ Solenoid/Paper end sensor........77
4.2.21 Feed roller...................................................................................................78
4.2.22 Shaft eject Assy (FU)/ Shaft eject Assy(FD/ Eject sensor..........................79
4.3 Oiling spots.........................................................................................................80

43856301TH Rev.3 5 /
Oki Data CONFIDENTIAL
5. Maintenance Menu................................................................91
5.1 System maintenance menu (for maintenance engineer) ...................................92
5.2 Maintenance Utilities ..........................................................................................93
5.3 Maintenance menu functions..............................................................................95
5.3.1 Self-diagnostic mode ..................................................................................95
5.3.1.1 Operation panel...................................................................................95
5.3.1.2 Ordinary self-diagnostic mode (level 1)...............................................97
5.3.1.2.1 How to enter the self-diagnostic mode (level 1) ............................97
5.3.1.2.2 How to exit the self-diagnostic mode.............................................97
5.3.1.3 Switch scan test...................................................................................98
5.3.1.4 Motor clutch test...................................................................................100
5.3.1.5 Test print...............................................................................................102
5.3.1.6 Color registration correction test........................................................106
5.3.1.7 Density correction test.......................................................................107
5.3.1.8 Consumable item counter display......................................................109
5.3.1.9 Number of print copies counter display .............................................110
5.3.1.10 Switching between the Factory mode and the Shipping mode..........110
5.3.1.11 Self-diagnostic function setting..........................................................111
5.3.1.12 LED head serial number display .......................................................112
5.3.1.13 NVRAM parameter setting ...............................................................112
5.3.2 Various prints with the printer as a standalone unit ..................................112
5.3.3 Functions of keys at power on ..................................................................113
5.4 Setups upon completion of part replacement...................................................114
5.4.1 Precautions when replacing the engine control board.................................114
5.4.2 EEPROM setting upon completion of CU board ............................................
replacement..........................................................................................................115
5.5 Density control manual setting .........................................................................116
5.6 Printer boot menu list........................................................................................117
6. Periodic Maintenance ......................................................... 118
6.1 Cleaning ...........................................................................................................119
6.2 How to clean the LED lens array......................................................................120
6.3 How to clean the pickup roller ..........................................................................122
6.4 How to clean inside of printer...........................................................................123
7. Troubleshooting and repair procedure.............................125
7.1 Before starting the repair work .........................................................................126
7.2 Confirmation items before taking corrective action against abnormalities .......126
7.3 Precautions when taking corrective action against abnormality.......................126
7.4 Preparation for troubleshooting ........................................................................126
7.5 Troubleshooting method...................................................................................127
7.5.1 LCD message list......................................................................................127
7.5.2 Preparation for troubleshooting.................................................................148
7.5.3 Troubleshooting the abnormal images......................................................180
7.5.4 Network troubleshooting...........................................................................187
7.5.4.1 Connection error occurs with the Web browser.................................187
7.5.4.2 Print operation is not possible............................................................193
7.5.4.3 Cannot create Certificate...................................................................194
7.5.4.4 Installation of Certificate is not possible.............................................194
7.5.4.5 Other questionnaires .........................................................................196
7.5.4.6 Restrictions when using Internet Explore 7.......................................198
7.6 Fuse check.......................................................................................................199
7.7 Paper cassette switches versus Paper size correspondence table..................200
7.8 Data protection kit-A1.......................................................................................201
7.8.1 Data protection kit-A1 (DPK-Al) overview.................................................201
8. Connection diagrams..........................................................205
8.1 Resistance value check....................................................................................206
8.2 Parts location....................................................................................................210
8.3 F/W version number.........................................................................................221
8.3.1 ROM control number.................................................................................221
8.3.2 ROM version check and display................................................................222
8.3.3 PCB Maintenance Indication Stamp.........................................................222

Oki Data CONFIDENTIAL
1.
Configuration
1.1 System configuration.......................................................................7
1.2 The Configuration of printer.............................................................8
1.3 Optional parts..................................................................................9
1.4 Specifications ................................................................................10
1.5 Specification of interface ...............................................................13

43856301TH Rev.3 7 /
Oki Data CONFIDENTIAL 1.Configuration
1.1 System configuration
Environmental humidity
Feeder
clutch
Hopping
clutch
Paper-feeding
/moving
motor
Feeder
clutch
Hopping
clutch
Paper-feeding
/moving
motor
20MHz
Centronics
EEP
ROM
CC1
ASIC
CIF2
ASIC
HDD
LAN USB
CU PCB
Flash
ROM
Option
RAM
CPU
Paper-feeding
Solenoid
Duplex
FAN
Front
sensor
IN
Sensor
Cover
oper
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
BELT
Duplex
clutch
Separator
Solenoid
Duplex
motor
Paper
size
SW
1st
P.E
sensor
Belt unit
Relay PCB
Fuser
Inlet
EXIT sensor
Density sensor
Color blur PCB
right
Color blur PCB
left
Belt unit
Fuse cut
Fuser fuse Cut/
Upper center/ For correction/
Low thermistor
Low-voltage PCB
FAN, heater control,
others 5V, 24V, 0VL, 0VP
AC-SW
Heater power
M
HEAT
ID cooling
FAN
Low-voltage
FAN
ARMORED CPU
PU PCB
Fuse cut,
EXIT
Color blur, density,
thermistor signal
FLASH
16Mbit
High-voltage I/F, FAN control,
Cover open
EEPROM
High-voltage PCB
RFID PCB
K-ID Y-ID M-ID C-ID
Fuser
FAN
Belt
thermistor
Cover
open
sensor
ID UP/
DOWN
Environment
sensor
Operation panel PCB
Toner sensor PCB
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
Operation panelI/F
DCON I/F LSYNC
Stacker
full
sensor
2nd
Hopping
sensor
3rd
P.E
sensor
3rd
IN
sensor
3rd
paper
size SW
3rd
Hopping
sensor
3rd TRAY PCB
Figure 1-1-1 represents the system configuration of the printer.
Fig1-1

43856301TH Rev.3 8 /
Oki Data CONFIDENTIAL 1.Configuration
1.2 The Configuration of printer
Air flow
Fig 1-2
The parts in the C710n are shown as below.
• Electrophotography process mechanism
• Paper feed path
• Control part (CU part/ PU part)
• Operator panel
• Power part (High-voltage part/low-voltage part)
The Configuration of the printer is shown in Fig 1-2.

43856301TH Rev.3 9 /
Oki Data CONFIDENTIAL 1. Configuration
1.3 Optional parts
The optional parts for this printer are shown as below.
(1) Optional tray(second tray/ third tray)
(2) Duplex Unit
(3) Optional memory
(4) Built-in hard disk
(Standard built-in hard disk, data protection kit A1)

43856301TH Rev.3 10 /
Oki Data CONFIDENTIAL 1. Configuration
1.4 Specifications
Division Item
Dimension Width 435mm
Depth 536mm
Height 389mm
Weight About 28kg
Width of print Width of print Letter size, vertical
Print speed Engine speed (A4) 30PPM(Color)
32PPM(Mono)
Print start First print time 8sec(mono), 9sec(color) (A4)
Warmup time 60sec
Low noise mode Unvailable
Resolution LED head 600dpi
Maximum input
resolution
600×1200dpi
Output resolution True 600×1200dpi
True 600×600dpi
Step 4 step 600×600dpi
Econo mode Save toner by recreasing brightness
CPU Core PowerPC750
I-cash, /
D-cash
L2=256KB
Clock 700MHz
Bus width 64bit
RAM Resident 256MB
Division Item
ROM Program+font 64MB
Power
consumption
Input power supply (120V)110~127VAC±10%,
(230V)220~240VAC±10%
Power save mode Less than 17W
Idle 100W (Average)
Usual operation 530W (It differs from operating environment)
Peak 1200W
Operating
environment
(Temperature)
During operating 10 ~32 , 17 ~27
(Temperature requirement for full-color print)
During non-
operating
0~43 , power off
During keeping
(for a year at most )
-10 ~43 , with drum and toner
During transferring
(for a month at most)
-29 ~50 , with drum, without toner
During transferring
(for a month at most)
-29 ~50 , with drum, without toner
Operating
environment
(Humidity)
During operating 20%~80%, 50%~70%
(Humidity requirement for full-color print)
The highest wet bulb temperature is 25
During non-
operating
10%~90%, The highest wet bulb temperature is
26.8 , power off
During keeping 10%~90%, The highest wet bulb temperature is
35
During transferring 10%~90%, The highest wet bulb temperature is
40

43856301TH Rev.3 11 /
Oki Data CONFIDENTIAL 1. Configuration
Division Item
Operation life Printer operation life 600,000 pieces A4 transvers direction, 5years
Print duty
(M=L/12, A=L/12/5)
Max 100,000 pages / month
Average 6,000 pages/ month
MTBF
(2.3% duty)
Unvailable
MPBF 50,000 pages
MTTR Within 20 minutes
Toner operation life
(5% duty)
Mounting toner: 4,000 pages(black), 4,000
pages (color)
Standard: 10,000 pages(black), 10,000
pages(color)
S type: 5,000 pages(black), 5,000 pages(color)
For the first new drum: about 9,200
pages(standard), 4,200 pages(S type)
Image drum
operation life
20,000 pages (when 3 pages /job)
12,000 pages (when 1 page/job)
27,000 pages (when continuously print)
Drum count all reset
Transcribing belt
operation life
60,000 pages (A4 transverse size, when 3 pages
/job) count auto reset
Fuser operation life 60,000 pages (A4 size) count auto reset
Operation
sound
During operation 55.6dBA (ISO 7779 front)
(without option unit)
During standby 37dB(ISO 7779 front)
Power save mode Background level
Division Item
Paper handling Paper stack capacity
(1st tray)
Legal /Universal cassette 530 pieces (70kg)
Paper stack capacity
(optional tray)
Legal /Universal cassette 530 pieces (70kg)
Paper stack capacity
(Manual/auto)
Standard multipurpose tray or 100 pieces (70kg),
or 10 pieces of envelop
Paper rejection 350 pieces (70kg), facedown/
100 pieces (70kg), faceup tray
Duplex Standard/ Option
Paper size A4, A5, B5, A6*, letter, legal(13/13.5/14),
Executive, post card**, return post card**,
custom***, envelope , Index card 3x5in, Photo
size 4x6 5x7in
* : The paper of A6 cannot be used in tray 1, 2, 3
**: The post card, return post card and envelope can
be used in MPT only
***: As for custom, the available size can be adjusted
by using different tray. The length is up to 1220mm.
Minimum paper
size
Tray 1
Tray 2(option)
Tray 3(option)
MPT
A5
A5
A5
Postcard
Thickness of
paper
Tray 1
Tray 2(option)
Tray 3(option)
MPT
64g/m2~188g/m2
64g/m2~203g/m2
64g/m2~203g/m2
64g/m2~220g/m2

43856301TH Rev.3 12 /
Oki Data CONFIDENTIAL 1. Configuration
Division Item
Control panel LCD Resolution 128×64 dot graphic panel
Paper size is not displayed
LED (color) 2 (Green×1, dark umbar×1)
Switch 8
Status switch/
sensor
Paper out Have
Paper low None
Toner low Have (Y, M, C, K)
Cover open Have
Temperature of fuser Have
Paper size Have (Manual setting)
Stacker full Have
Communication
interface
Standard
(On the PCB)
• Hi-Speed USB
• Ethernet
• Centronics
Input and output
switch
Auto
Emulation Standard PCL(PCL5c, HP-GL) /
PCL XL2.1
PostScript3 (Clone)
Emulation switch Auto
Font Bitmap Typeface Have
Scalable font Have
Rasterizer Have
Barcode Have
OCR Have
Japanese PCL font Have
Japanese PS font Have
Division Item
Option
(can be
removed)
RAM 256/512MB DIMM
2.5" IDE HDD
It is possible to be
installed by user
• Standatd built-in HDD
• Data protection kit A1
Tray mechanism 2nd tray mechanism, 3rd tray mechanism
Cassette Universal (530 pieces)
Double print unit Standard/ Option
Others Univailable
Others USB-IF logo Have
Windows logo Have
UPS operation The operation with UPS(Uninterruptible Power
Supplies) is not guaranteed
Please do not use the UPS

43856301TH Rev.3 13 /
Oki Data CONFIDENTIAL 1. Configuration
1.5 Specification of interface
1.5.1 Specification of USB interface
1.5.1.1 General of USB interface
(1) Spec.
USB (Support Hi speed USB )
(2) Transmission mode
Full speed (Maximum 12Mbps 0.25%)
High speed(Maximum 480Mbps 0.05%)
(3) Power control
Self power device
1.5.1.2 Connector and cable of USB interface
(1) Connector
•Printer side: B Receptacle (female)
Up-stream port
(UBR24-4K5C00 (made by ACON)) Equivalent goods
Connector pins array
(2) Cable
The length of the cable:the cable of less than 5m with USB 2.0 spec.
(Less than 2m is recommended)
(Please use the shielded wire for the cable.)
1.5.1.3 USB interface signal
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
3 4
1

43856301TH Rev.3 14 /
Oki Data CONFIDENTIAL 1. Configuration
1.5.2 Specification of network interface
1.5.2.1 General of network interface
Spec.
Network Protocol
TCP/IP sepc. Network layer
ARP, IP, ICMP, IPv6
Transfer layer
TCP, UDP
Application layer
LPR, Port9100, FTP, HTTP, HTTPS, IPP, SNMPv1/v3,
TELENET, DHCP/BOOTP, DNS, DDNS, WINS, UPmP, Bonjour,
SNTP, SMTP, POP,Windows Rally (WSD Print, LLTD).
NetBEUI: SMB, NetBIOS
Netware: Remote printer mode(Maximum 8 print sever )
Print sever mode (Maximum 8 files sever: 32 queue)
For encrypted password (when it is print sever mode)
NetWare6J/5J/4.1J (NDS, bindery)
SNMP
EtherTalk: ELAP, AARP, DDP, AEP, NBP, ZIP, RTMP, ATP, PAP
IEEE802.1X: EAP-TLS, PEAP
(2) Cable
Non-shield twisted-pair cable with RJ-45 connector
(Category 5 is recommended)
1.5.2.3 Signal of network interface
Pin No. Signal name Direction Function
1 TXD+ FROM PRINTER Transmission data +
2 TXD- FROM PRINTER Transmission data -
3 RXD+ TO PRINTER Receive data +
4 − − Not use
5 − − Not use
6 RXD- TO PRINTER Receive data -
7 − − Not use
8 − − Not use
1 8
1.5.2.2 Connector and cable of network interface
(1) Connector
100BASE-TX/10 BASE-T (Auto switch, cannot be used simultaneously)
Connector pins array

43856301TH Rev.3 15 /
Oki Data CONFIDENTIAL 1. Configuration
1.5.3 Specification of parallel interface
1.5.3.1 General of parallel interface
Spec.
IEEE1284-1994 conforming parallel interface
1.5.3.2 Connector and cable of parallel interface
(1) Connector
Printer side : 36-Pole connector (Female)
57LE-40360-12(D56) (made by DDK) equivalent goods
Cable side : 36-Pole connector (male)
57FE-30360-20N(D8) (made by DDK) equivalent goods
118
1936
Item Content
Related mode Compatible mode, nibble mode, and ECP mode
Data bit length Compatible:8, nibble: 4, ECP: 9bit
Pin layout seen from interface cable side
(2) Cable
IEEE1284-1994 cable of less than 1.8m is used.
(For avoiding noise interference, please use shielded cable with the twisted-pair wire.)
1.5.3.3 Parallel interface level
Low level 0.0V~+0.8V
High level +2.4V~+5.0V
Pin NO. Name of signal Direction Function
1 nStrobe (HostClk) TO PRINTER It is a pulse to read data. Data is read by
posterior end.
2~9 DATA 1~DATA 8 Bi-direction It is parallel data of 8 bits.The high level
is “1", and the Low level is “0".
10 nAck(PtrClk) FROM
PRINTER It is a signal that shows the data reception completion.
11 Busy(PtrBusy) FROM
PRINTER It is a signal that shows if the printer is receiving the data. Data cannot be
received when it is at the high level.
12 PError(AckDataReq) FROM
PRINTER The paper error is shown when it is at the high level.
13 Select(Xflag) FROM
PRINTER When parallel interface is effective, it is always in high-level state.
14 nAutoFd(HostBusy) TO PRINTER It is used by the bidirectional
communication.
15 - - Not use
16 GND - Signal ground
17 FG - Chassis ground
18 +5V FROM
PRINTER It cannot supply power outside.
19~30 GND - Signal ground
31 nInit(nInit) TO PRINTER The printer is initialized with the low
level.
32 nFault(nDataAvail) FROM
PRINTER When the printer is in alarm state, it becomes low level.
33 GND - Signal ground
34 - - Not use
35 HILEVEL FROM
PRINTER It is pulled up to +5V at 3.3K in the
printer.
36 nSelectIn
(IEEE1284 active) TO PRINTER It is used by bidirectional communication. It must be low level when it is in
compatible mode.
1.5.3.4 Signal of interface
Notes! • The signal name showed in the bracket is a signal name in nibble
mode.
• It only describes the function in compatible mode.
• The nibble mode of IEEEstd1284-1994 regulated by Institute
of Electrical and Electronics Engineers is supported. Using the
computer and the cable unsupported this standard may lead to
unexpected operation.

Oki Data CONFIDENTIAL
2.
Operating instructions
2.1 Electrophotographic processing mechanism.................................17
2.2 Printing process.............................................................................21

43856301TH Rev.3 17 /
Oki Data CONFIDENTIAL 2. Operating instructions
(1) Electrophotographic processing
The general of Electrophotography process is described as below.
1. Charging
The voltage is impressed to CH roller, and the surface of OPC drum is
electrified.
2. Exposure
LED head irradiates light to the image signal on the surface of the electrified
OPC drum. The electricity of the irradiated part on the surface of the OPC drum
is attenuated by changing in light intensity, the electrostatic latent image is
formed on the surface of the OPC drum.
3. Development
The electrified toner adheres to the electrostatic latent image of the OPC drum
by electrostatic force, and the image is developed on the surface of the OPC
drum.
4.Transfer
The paper is overlapped on the surface of the OPC drum, and the electricity
is generated on the back of the paper by transfer roller, the toner image is
transcribed to the paper.
5. Fusing
Heat and pressure are applied to the toner image on the paper in order to make
it fusing.
6. Drum cleaning
The drum cleaning blade removes the toner left on the OPC drum after transfer.
7. Electricity removal
The electric potential left on the drum is removed.
8. Belt cleaning
The belt cleaning blade removes the toner left on the belt.
2.1 Electrophotographic processing mechanism
(2) Charging
The voltage is impressed to the charging roller in contact with the surface of
OPC drum, and the surface of OPC drum is charged.
(3) Exposure
The light generated from LED head is irradiated onto the surface of the electrified
OPC drum.The electricity of the irradiated part on the surface of the OPC drum is
attenuated by changing in light intensity, the electrostatic latent image is formed
on the surface of the OPC drum.
-
--
--
---
-
Power
unit
OPC drum
Paper
LED head
OPC drum
LED head
Charging roller
-
--
--
-
Power
unit
Charging roller
OPC drum

43856301TH Rev.3 18 /
Oki Data CONFIDENTIAL 2. Operating instructions
(4) Development
The toner adheres to the electrostatic latent image on the surface of the drum,
and the electrostatic latent image is changed into the toner image.
1. The sponge roller makes the toner adhere to the developing roller.
2. The electrostatic latent image on the surface of the OPC drum surface
is visualized by toner.
(5) Transfer
The paper is overlapped on the surface of the OPC drum, and the electricity is
generated on the back of the paper by transfer roller.
When high voltage is impressed from the power supply to the transfer roller,
the electricity induced in the transfer roller is moved to the surface of the paper
via contact surface, and the toner is drawn from the surface of the OPC drum
to the surface of the paper.
-
--
--
---
-
-
--
Developing roller Sponge roller
OPC drum
Charging roller
-
--
--
---
-
-
--
--
-
+-
+-
+
-
+
-
+
-
+- +- +- +- +- +
-
+- +
-
+- +
-
+- +
Power
unit
OPC drum
Transfer roller
Paper
Transport belt

43856301TH Rev.3 19 /
Oki Data CONFIDENTIAL 2. Operating instructions
-
+- +- +- +-
+
-
+
-
+- +
-
+- +
-
+- +-
-
-
ID unit
Waste toner area
Toner cartridge
Drum cleaning blade
(6) Fusing
When the paper passes through the heat roller and backup roller unit, heat
and pressure are applied to the toner image on the paper and the toner is
fused onto the paper.
The halogen lamps of 800W and 300W are built in heat roller. The backup
roller without built-in halogen lamp is heated by the heat transmission from the
heat roller. The fusing temperature is controlled by the temperature detected by
the thermistor that is not in contacting with the surface of the heat roller. On
the other hand, the temperature detected by the thermistor rubbing the surface
of backup roller is used for controlling the fusing temperature under specified
conditions. Furthermore, a thermostat is used to limit the temperature rise, if
the temperature rise of heat roller exceeds a set point, the thermostat would
be open and the voltage supply to the heater would be cut off. The backup
roller unit is pressed on the heat roller by the spring on both sides.
(7) Drum cleaning
The Unfused toner left on the OPC drum is cleaned up by the drum cleaning
blade, and all residual toner is collected in the waste toner area of the toner
cartridge.
Heat roller
Backup roller
Pad
thermistor
thermistor
Paper
Paper feeding path
thermostat
Fuser belt
(8) Electricity removal
The electricity on the surface of the OPC drum is attenuated by irradiating the
light to the surface of the OPC drum after transfer.
Electricity-removing
light PCB
Charging roller
OPC drum
Electricity-removing
light