Oki C810 User manual

Oki Data CONFIDENTIAL
C810
Maintenance Manual
(ODA/OEL/AOS)
[Rev.1]
Related drawings
Drawing No. Name
44072901TL C810 Disassembly For Maintenance
44072901TR C810 RSPL
BOM Use for Certification Body
Rev Date DCO No. Contents Design Approval
Approval Takashi Wakana Design Takashi Wakana Name
C810
Maintenace Manual
Check Xxxxx Xxxxx
Date
2009-02-25 Drawing No.
44072903TH 1
221
No.01

44072903TH Rev.1 2 /
Oki Data CONFIDENTIAL
Document Revision History
Rev.
No. Date
Corrected Items Person in
charge
No. Page Description of change
1 2009-02-25 Issue T. Wakana
Rev.
No. Date
Corrected Items Person in
charge
No. Page Description of change
Document Revision History

44072903TH Rev.1 3 /
Oki Data CONFIDENTIAL
This manual explains the maintenance methods for the C810dn.
The manual has been prepared for use by the maintenance personnel. For
operating methods of the C810dn, refer to the corresponding user's manual.
In this manual, the printer name may be described as follows.
C810dn →C810
Note! • The contents of this manual are subject to changes without prior notice.
• Despite that exhaustive efforts were made in preparing the manual to
make it accurate, it still may contain errors. Oki Data will not hold itself
liable for any damage that results or is claimed to have resulted from
repair, adjustment, or modification of the printer conducted by the user
using this manual.
• The parts employed in the printer are so delicate that they may be
damaged if not treated properly. Oki Data strongly recommends that
the maintenance of the printer be undertaken by Oki Data's registered
maintenance personnel.
• Work after eliminating static electricity.
PREFACE
PREFACE

44072903TH Rev.1 4 /
Oki Data CONFIDENTIAL
INDEX
INDEX
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 Outline of USB interface..................................................................... 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 Outline of network interface ............................................................... 15
1.5.2.2 Network interface connectors and cables.......................................... 15
1.5.2.3 Network interface signals ................................................................... 15
2. DESCRIPTION OF OPERATION..................................... 16
2.1 Electrophotographic process mechanism ........................................................ 17
2.2 Printing process ................................................................................................ 20
3. INSTALLATION................................................................30
3.1 Cautions, and do’s and don’ts........................................................................... 31
3.2 Unpacking procedure........................................................................................ 32
3.3 Printer installation instructions .........................................................................33
3.4 List of components and accessories ................................................................34
3.5 Assembly procedure ......................................................................................... 35
3.5.1 Assembly of the printer main unit ...............................................................35
3.5.2 Connection of the power cable................................................................... 40
3.5.3
Installation and recognition confirmation of options ............................................... 42
3.6 Printing of the MENU MAP ............................................................................... 50
3.7 Connection methods......................................................................................... 51
3.8 Checking of paper used by the user .................................................................53
4. REPLACEMENT OF PARTS ...........................................54
4.1 Notes on replacement of parts..........................................................................55
4.2 Part replacement procedure ............................................................................. 57
4.2.1 Belt unit....................................................................................................... 57
4.2.2 Fuser unit .................................................................................................... 58
4.2.3 Left side cover ............................................................................................ 59
4.2.4 Right side cover..........................................................................................60
4.2.5 Rear cover Assy.......................................................................................... 61
4.2.6 LED Assy. ................................................................................................... 62
4.2.7 Main controller PCB, image drum motor, image drum lift-up motor and
feed motor...................................................................................................63
4.2.8 Print engine controller PCB ....................................................................... 66
4.2.9 Top cover Assy. .......................................................................................... 68
4.2.10 Top cover .................................................................................................... 70
4.2.11 Operator panel Assy. .................................................................................. 71
4.2.12 Board PRP.................................................................................................. 72
4.2.13 Shaft-ejection Assy. (FU) and shaft-ejection Assy.(FD) ............................ 73
4.2.14 Guide-ejection Assy.-lower, color-registration Assy. and
relay board (P6Y) ....................................................................................... 74
4.2.15 Fan (fuser), high-voltage power supply board, contact Assy.,
fuser sensor Assy. ...................................................................................... 78
4.2.16 MPT Assy., MPT hopping roller, separator and pick-up roller.................... 80
4.2.17 Registration roller Assy............................................................................... 81
4.2.18 Gear box, registration/hopping roller Assy. and solenoid .......................... 82
4.2.19 Holder-switch Assy., low-voltage power supply fan and low-voltage
power supply...............................................................................................85
4.2.20 Belt motor Assy. and fuser motor Assy....................................................... 87
4.2.21 Side-R Assy. and side-L Assy. ................................................................... 89
4.2.23 Paper feed rollers (tray 2/3 (option)) .......................................................... 93
4.2.24 Paper feed roller (multi-purpose tray) ........................................................95
4.3 Portions Lubricated...........................................................................................96

44072903TH Rev.1 5 /
Oki Data CONFIDENTIAL INDEX
5. MAINTENANCE MENUS............................................... 112
5.1 System maintenance menu (For maintenance personnel) .............................113
5.2 Maintenance utility ...........................................................................................114
5.3 Functions of user's maintenance menu ...........................................................117
5.3.1 Maintenance menu (For end users) ..........................................................117
5.3.2 Self-diagnostic mode.................................................................................119
5.3.2.1 Operator panel...................................................................................119
5.3.2.2 Normal self-diagnostic mode (Level 1)............................................. 121
5.3.2.2.1 Activation method for self-diagnostic mode (Level 1) ...................... 121
5.3.2.2.2 Deactivation of self-diagnostic mode ............................................... 121
5.3.2.3 Switch scan test................................................................................ 122
5.3.2.4 Motor clutch test ............................................................................... 124
5.3.2.5 Test print ........................................................................................... 126
5.3.2.6 Color registration adjustment test .................................................... 130
5.3.2.7 Print density adjustment test ............................................................ 131
5.3.2.8 Indication of consumable part counters ........................................... 132
5.3.2.9 Indication of printed page counters .................................................. 133
5.3.2.10 Factory/Shipping switching .............................................................. 133
5.3.2.11 Setup of self-diagnostic function ...................................................... 134
5.3.2.12 Indication of LED head serial number .............................................. 134
5.3.3 Various types of print on the individual printer equipped
with controller ........................................................................................... 135
5.3.4 Functions of keys when depressed at power-on ...................................... 135
5.4 Setup after replacement of parts .................................................................... 136
5.4.1 Precautions on the replacement of engine control PCB .......................... 136
5.4.2 Setup of EEPROM after replacement of CU PCB.................................... 137
5.4.3 Setup of destination.................................................................................. 138
5.5 About the manual setup of Print density adjustment...................................... 139
5.6 Administrator Menu List of the Printer ............................................................ 140
How to Change ................................................................................................ 140
6. CLEANING .................................................................... 142
6.1 Cleaning.......................................................................................................... 143
6.2 Cleaning the LED lens array ........................................................................... 144
6.3 Cleaning of pickup rollers ............................................................................... 146
7. TROUBLESHOOTING PROCEDURES ......................... 147
7.1 Precautions prior to repair .............................................................................. 148
7.2 Items to be checked prior to taking action on abnormal images .................... 148
7.3 Precautions when taking action on abnormal images.................................... 148
7.4 Preparations for troubleshooting .................................................................... 148
7.5 Troubleshooting method ................................................................................. 149
7.5.1 LCD Message list...................................................................................... 149
7.5.2 Preparing for troubleshooting ................................................................... 168
7.5.2.(1) LCD Display Malfunction .............................................................. 169
7.5.2.(2) Irregular Operation of the device after turning on the power........ 171
7.5.2.(3) Paper Feed Jam(Error 391:1st Tray)............................................. 178
7.5.2.(4) Paper Feed Jam (Error 380)......................................................... 180
7.5.2.(5) Paper Feed Jam (Error 390:Multi-purpose Tray).......................... 181
7.5.2.(6) Paper Path Jam(Error 381)........................................................... 183
7.5.2.(7) Paper Exit Jam(Error 382)............................................................ 185
7.5.2.(8) Duplex Print Jam(Error 370, 371, 372, 373, 383) ......................... 187
7.5.2.(9) Paper Size Error (Error 400, 401) ................................................. 189
7.5.2.(10) ID Unit Up-Down Error(Service Call 140-143) .............................. 190
7.5.2.(11) Fuser Unit Error(Error 170-177) .................................................... 191
7.5.2.(12) Motor Fan Error(Error 120, 127, 051) ............................................ 192
7.5.2.(13) Print Speed is Slow (Low Performance)....................................... 192
7.5.2.(14) Option unit is not recognized ........................................................ 193
7.5.2.(15) LED head is not recognized(Error 131, 132, 133, 134)................. 194
7.5.2.(16) Toner cartridge is not recognized(Error 540, 541, 542, 543) ....... 194
7.5.2.(17) Fuse Cutout Error (Error 150-155) ................................................ 196
7.5.2.(18) Dew Condensation Errors (Error 123) .......................................... 196
7.5.2.(19) Connection Diagram ..................................................................... 197
7.5.3 Image Problem Troubleshooting .............................................................. 198
7.5.3.(1) Color is totally pale (Fig.7.2 A) ...................................................... 199
7.5.3.(2) Background is dirty (Fig.7.2 B)......................................................200
7.5.3.(3) Blank Print (Fig.7.2 C) ................................................................... 201
7.5.3.(4) Vertical lines are printed ............................................................... 201
7.5.3.(5) Cyclic Print Trouble (Refer to Fig.7.2 E)........................................202
7.5.3.(6) Color registration is wide. .............................................................202
7.5.3.(7) Solid Black Print............................................................................ 203

44072903TH Rev.1 6 /
Oki Data CONFIDENTIAL INDEX
7.5.3. (8) Cannot Print .................................................................................. 203
7.5.5 Network Troubleshooting.......................................................................... 204
7.6 Check of fuses ................................................................................................205
7.7 Paper cassette switches versus Paper size correspondence table ............... 206
8. CONNECTION DIAGRAMS...........................................207
8.1 Check of resistance values............................................................................. 208
8.2 Component layout........................................................................................... 212

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

44072903TH Rev.1 8 /
Oki Data CONFIDENTIAL 1. CONFIGURATION
1.1 System Configuration
Environmental humidity
High-voltage I/F, Fan control,
Cover-open
K LED HEAD
Y LED HEAD
M LED HEAD
C LED HEAD
Operator panel PCB
Toner sensor PCB
High-voltage PCB
RFID PCB
Low-voltage PCB
ARMORED CPU
Paper
feed
solenoid
Duplex
FAN
Front
sensor
IN
sensor
Cover
open
sensor
Rear
sensor
Bottom
sensor
Hopping
sensor
P.E
sensor
IN
sensor
Paper
size SW
Front sensor PCB
DUPLEX PCB 2nd TRAY PCB
IN1 IN2 WR
M
ID
M
HOP M
IDUP
M
HEAT
Fuser unit
Fuser-end
cooling FAN
Shutter
solenoid
M
BELT
Feed
clutch
Hopping
clutch
Paper feed/
transportation
motor
Hopping
sensor
P.E
sensor
IN
sensor
Paper
size SW
3rd TRAY PCB
Feed
clutch
Hopping
clutch
DUPLEX
Clutch
Separator
solenoid
Duplex
motor
Paper
size SW
Belt unit
PU PCB
Junction PCT
Fuser unit Inlet
EXIT
sensor
Fuser release
sensor
Fuser-IN
sensor
Density
sensor
Color
registration
PCB right
Color
registration
PCB left
Belt unit
Fuse-cut
Fuser fuse-cut/UP&LOW
Upper center/ compensation
Upper side/ Lower Thermistor
Fuse cut,
EXIT
Color drift, density,
Thermistor signal 20MHz
FLASH
8Mbit
FAN, heater control,
others
Fuser-IN, release
5V、24V、0VL、0VP
EEPROM
K-ID Y-ID M-ID C-ID
Low-
voltage
FAN AC-SW
Fuser
FAN
Belt
thermistor
ID UP/
DOWN
Cover-
open
sensor
K toner
sensor
Y toner
sensor
M toner
sensor
C toner
sensor ID fuse cut
SPILYTAS
(Built-in by CPU)
ASIC
LAN USB
CU PCB
LEISUS
command I/F
Environment
sensor
DCON I/F LSYNC
LAN
controller
USB
device
controller
1st P.E
sensor
Paper feed/
transportation
motor
Figure 1-1 represents the system configuration of the printer.
Figure 1-1

44072903TH Rev.1 9 /
Oki Data CONFIDENTIAL 1. CONFIGURATION
1.2 Printer configuration
The internal part of the printer is composed of the following sections:
• Electrophotographic processing section
• Paper paths
• Control sections (CU sect./PU sect.)
• Operator panel
• Power supply sections (High-voltage sect./low-voltage sect.)
Figure 1-2 represents the configuration of the printer.
Figure 1-2

44072903TH Rev.1 10 /
Oki Data CONFIDENTIAL 1. CONFIGURATION
1.3 Composition of optional items
The following optional items are available for the printer.
(1) Expanded tray
(2) Duplex-Unit
Model name : CAB-S1
(3) Cabinet with wheels

44072903TH Rev.1 11 /
Oki Data CONFIDENTIAL 1. CONFIGURATION

Division Item Contents
External
dimensions
Width 485mm
Depth 593mm
Height 345mm
Mass Approx. 40kg
Print width Print width A4 Landscape
Print speed Engine speed
(A4 portrait)
30PPM (Color)
32PPM (Monochrome)
Print start First print time
(Tray1)
9.5 sec (monochrome), 10 sec (color) (A4 portrait)
Warm-up time 90 sec
Low-noise
mode
Not applicable
Resolution

LED head 600 dpi
Max. input
resolution
600 x 1200 dpi
Output
resolution
True 600 x 1200 dpi
True 600 x 600 dpi
Gradation 4-gray scale 600x600 dpi
Econo-mode Toner-saving by decreasing lightness
CPU

Core Equivalent to Power PC405
I-cache/
D-cache
16KB/ 16KB
Clock 200MHz
Bus width 32bit
RAM Resident 128MB
ROM Program + font 4MB
Division Item Contents
Power
consumption

Power input 120VAC ± 10% 230VAC± 10%
Power-save
mode
15W or less
Idle 200W (Average)
Normal
operation
570W (Depends on the use environment)
Peak 1350W
Operating
environment
(Temperature)
When
operating
10˚C~32˚C, 17˚C~27˚C
(Full-color print quality guarantee temperature)
When not
operating
0˚C~43˚C, Power off
When stored
(for max. 1 yr.)
-10˚C~43˚C, With drum and toner
When
transported (for
max. 1 mo.)
-29˚C~50˚C, With drum, but no toner
When
transported (for
max. 1 mo.)
-29˚C~50˚C, With drum and toner
Operating
environment
(Humidity)
When
operating
20%~80%, 50%~70%
(Full-color print quality guarantee humidity)
Max. wet-bulb temp.: 25˚C
When not
operating
10%~90%, Max. wet-bulb temp.: 26.8˚C, with power off
When stored 10%~90%, Max. wet-bulb temp.: 35˚C
When
transported
10%~90%, Max. wet-bulb temp.: 40˚C
1.4 Specifications

44072903TH Rev.1 12 /
Oki Data CONFIDENTIAL 1. CONFIGURATION
Division Item Contents
Duration Printer life 5 years or 600,000 pages
Print duty
(M=L/12,
A=L/12/5)
Max. 50,000 pages / mo.
Average 10,000 pages / mo.
MTBF
(2.3% duty)
Not applicable
MPBF 100,000 pages
MTTR Within 20 minutes
Toner life
(ISO.IEC
19798)
Enclosed toner: 2300 pages (Black), 2300 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 Approx. 20,000 pages (With 3 pages / job)
Approx. 11,000 pages (With 1 page / job)
Approx. 27,000 pages (When printed continuously)
Drum counter automatically reset
Transfer belt
life
80,000 pages (A4 portrait size, with 3 pages / job),
counter automatically reset
Fuser unit life 100,000 pages (A4 size), counter automatically reset
Operation
noise
In operation 54dBA (ISO 7779 front)
(when the optional tray is not installed)
On standby 37dB (ISO 7779 front)
Power-save
mode
Background level
Paper
handling
Paper capacity
(1st tray)
Legal/universal cassette: 300 sheets (70kg)
Paper capacity
(Expanded
tray)
Legal/universal cassette (Optional): 530 sheets (70kg)
Paper capacity
(Manual/ auto)
Standard multi-purpose tray: 100 sheets of paper (70kg)
or 10 envelopes
Division Item Contents
Paper
handling
Delivery 250 sheets (70kg) face-down/
100 sheets (70kg) face-up in tray
Duplex Standard
Paper size A3, A4, A5, B5, A6*, Letter, Legal13/13.5/14, Executive,
Postcard**, Double postcard**, Custom***, Envelope (DL,
C4, C5, Com-10, Cho-3, You-0, You-4, Kaku2, Kaku3)
*: A6 cannot be used in Tray 2/ 3.
**: Postcards and double postcards can be used in MPT
only.
***: For Custom, available size depends on a tray.
The max. length is 1320mm.
Min. paper
size
Tray1 A6
Tray 2 / 3
(Options)
A5
MPT Postcard
Media weight Tray 1 64g/m2 ~120g/m2
Tray2/ 3
(options)
64g/m2 ~176g/m2
MPT 64g/m2 ~220g/m2
Operator
panel
LCD 16 characters in 2 line (Roman alphabet/Japanese kana)
No paper size indicated
LED (color) 2 (Green x1, dark amber x1)
Switch 6
Status switch/
sensor
Paper out Yes
Paper low None
Toner low Yes (Y, M, C, K)
Cover open Yes
Fuser unit
temp.
Yes
Paper size Yes (Manual operation)
Stacker full None

44072903TH Rev.1 13 /
Oki Data CONFIDENTIAL 1. CONFIGURATION
Division Item Contents
Commu-
nication
interface
Standard
(On PCB)
• Hi-Speed USB
• Ethernet
Option None
Input/ output
switch
Auto
Emulation Standard Hiper-C
Emulation
switch
None
Font Bit-map
Type face
None
Scalable font None
Rasterizer None
Bar code None
OCR None
Japanese PCL
font
None
Japanese PS
font
None
Optional item
(Detachable)
RAM None
2.5” IDE
HDD User-
installable
None
Tray
mechanism
2nd/ 3rd tray mechanism
Cassette Universal (530 pages)
Duplex print
unit
Yes
Long paper
supporter
None
Others Not applicable
Factory
default
OEL/ODA GDI model
Division Item Contents
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.

44072903TH Rev.1 14 /
Oki Data CONFIDENTIAL 1. CONFIGURATION
1.5 Interface specifications
1.5.1 USB interface specifications
1.5.1.1 Outline of USB interface
(1) Basic specifications
USB (Hi-Speed USB supported)
(2) Transmission mode
Full speed (Max. 12Mbps ± 0.25%)
High speed (Max.480Mbps ± 0.05%)
(3) Power control
Self power device
1.5.1.2 USB interface connectors and cables
(1) Connector
• Printer side: B-receptacle (Female)
Upstream port
Product equivalent to UBR24-4K5C00 (Made by ACON)
(2) Cables
Cable length : USB2.0 type cables 5 meters long or shorter. (Cables 2 meters
long or shorter are recommended).
(Shielded cable lines shall be used.)
1.5.1.3 USB interface signals
Signal name Function
1 Vbus Power supply (+5V)
2 D- For data transfer
3 D+ For data transfer
4 GND Signal ground
Shell Shield
• Cable side: B-plug (Male)
2
3 4
1
Connector pin assignment

44072903TH Rev.1 15 /
Oki Data CONFIDENTIAL 1. CONFIGURATION
1.5.2 Network interface specifications
1.5.2.1 Outline of network interface
Basic specifications
Network Protocols
TCP/IP specification Network layer
ARP, IP, ICMP
Transport layer
TCP, UDP
Application layer
LPR, Por t 910 0, FTP, HT TP, IPP, SN MP v1,
TELNET, DHCP/ BOOTP, DNS, DDNS, WINS,
UPnP, Bonjour, SNTP, SMTP, Windows Rally (WSD
Print, LLTD)
NetBEUI: SMB, NetBIOS
(2) Cables
1 8
1.5.2.2 Network interface connectors and cables
(1) Connectors
100 BASE-TX / 10 BASE-T (Automatically switched, not usable simultaneously)
Connector pin assignment
RJ - 45 c onne cto r ized non - shie l de d t w iste d- pair c able ( Cate g or y 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

Oki Data CONFIDENTIAL
2. DESCRIPTION OF OPERATION
2.1 Electrophotographic process mechanism ................................. 17
2.2 Printing process.........................................................................20

44072903TH Rev.1 17 /
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

44072903TH Rev.1 18 /
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

44072903TH Rev.1 19 /
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 backup roller.
The heat roller is heated by 800W and 350W internal halogen lamps, and the
backup roller is heated by a 50W internal halogen lamp. The fuser temperature
is controlled according to the sum of the temperature that is not contacted with
the thermistor ground against the heat roller surface and the temperature that is
detected with the thermistor ground on the backup roller surface. There is also a
thermostat for safety purposes. When the heat roller temperature rises above a
certain temperature, the thermostat opens and shuts down the power supplied to
the heater. The backup roller unit is pressed against the heater with a 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 toner cartridge.
Heat roller
Backup roller
Pat
Thermistor
Thermistor
Thermostat
Paper
Thermostat
Fuser belt
-
+- +- +- +-
+
-
+
-
+- +
-
+- +
-
+- +
-
-
-
ID unit
Space for waste toner
Toner cartridge
Drum cleaning blade
(8) 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

44072903TH Rev.1 20 /
Oki Data CONFIDENTIAL 2. DESCRIPTION OF OPERATION
2.2 Printing process
The paper fed from Tray1, Tray2 or Tray3 is carried by the paper feed roller, the registration
roller L, and the transport roller. When the 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 selected by opening or closing of the face-up stacker.
While the above refers to the one-sided print operation of the printer, its operation in two-sided
print will be explained below.
When two-sided print is conducted, the paper that has passed through the fuser unit following
first one-sided print 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. Then, 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 to eventually merge the same route that comes from the tray. From
here on, the same operation as that of one-sided print of paper fed from the tray takes place.
Face-downstacker
Face-up stacker
MPT
Sub-roller
Paper feed roller
Sub-roller
Transport roller
Paper feed roller
Sub-roller
Transport roller
Paper feed roller
Registration roller L
Registration
roller U
MPT paper feed roller
Transport belt
Transport roller
Reverse roller
Separator DUP
Heat roller
Backup roller
Halogen lamp
Paper reverse
transport path
(1) Paper fed from 1st Tray
1. As illustrated in Figure 2-1, when the solenoid is ON, the registration motor
rotates (counterclockwise), transporting the paper until the IN1 sensor comes
ON. (When the solenoid is ON, the paper feed roller is driven.)
2. After causing the IN1 sensor to come ON, the paper is further carried over a
certain distance to finally hit the registration roller L. (This corrects skew of the
paper.)
3. As shown in Figure 2-2, the solenoid is turned OFF, and the paper is carried by
the registration roller L. (When the solenoid is OFF, the registration roller L is
driven.)
Registration roller U
(drive)
Registration roller U
(drive)
Hopping roller (drive)
Hopping roller (stop)
Paper
Paper
Sub-roller
(drive)
Sub-roller
(stop)
Registration motor
(counterclockwise)
Registration motor
(counterclockwise)
Registration roller L
(stop)
Registration roller L
(drive)
WR sensor
WR sensor
Solenoid lever
(solenoid: ON)
Solenoid lever
(solenoid: OFF)
Hopping gear Assy
IN2 sensor
IN2 sensor
IN1 sensor
IN1 sensor
Figure 2-1
Figure 2-2