OKI MB460, MB470, MB480 Schematic
MB460/470/480
Maintenance Manual
011409B
Oki Data CONFIDENTIAL
Document Revision History
Oki Data CONFIDENTIAL
Corrected items
Rev.No. Date
No. Page Description of change
1 2009-08-14 Issue PED14 M. Yamazaki
2 2009-10-13 P70
P125
P177
Change of P70 /P125
/P177
Person in
charge
PED25 H. Ishizuka
44306601TH Rev. 2
2 /
Oki Data CONFIDENTIAL
Preface
This manual explains the maintenance methods of MB460/MB470/MB480.
This manual is prepared for the maintenance person. In regard to the handling methods of MB460/
MB470/MB480, please refer to the User’s Manual.
Note! • Contents of
• 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 of the information contained herein. Oki Data
assumes no responsibility to the damages caused or claimed to have been
caused by the user as a result of repair, adjustment and/or change using this
manual.
• Parts of this product are delicate and can be damaged unless properly handled.
We strongly recommend the user to maintain the product at the hand of the
registered maintenance person of our company
• Before
this manual is subject to change without notice.
starting the maintenance work, please neutralize the static electricity.
44306601TH Rev. 2
3 /
Oki Data CONFIDENTIAL
Table of contents
1. ConfiguRaTion ................................................................................................7
1.1 System Configuration ...........................................................................................................7
1.2 Structure of MFP ...................................................................................................................9
Offer of Options ...................................................................................................................10
1.3
Specifications ......................................................................................................................11
1.4
Interface Specification .........................................................................................................13
1.5
.1 USB Interface Specification ...................................................................................13
1.5
.1.1 Outline of USB Interface .........................................................................13
1.5
.1.2 USB Interface Connector and Cable ......................................................13
1.5
.1.3 UBS Interface Signal ..............................................................................13
1.5
.2 Network Interface Specification .............................................................................14
1.5
.2.1 Outline of Network Interface ...................................................................14
1.5
.2.2 Network Interface Connector and Cable ................................................14
1.5
.2.3 Network Interface Signal ........................................................................14
1.5
.3 Telephone Line Interface Specification (Only MB470/MB480) ............................15
1.5
.3.1 Outline of telephone Line Interface ........................................................15
1.5
.3.2 Telephone Line Interface Connector and Cable .....................................15
1.5
.3.3 Telephone Line Interface signal .............................................................15
1.5
.4 Parallel Interface Specifications ...........................................................................16
1.5
.4.1 Parallel Interface Overview ....................................................................16
1.5
.4.2 Parallel Interface Connector and Cable .................................................16
1.5
.4.3 Parallel Interface Level ..........................................................................16
1.5
2. oPeRaTional exPlanaTion ........................................................................17
2.1 Electrophotographic process mechanism ..........................................................................17
2.2 Printing process ..................................................................................................................24
Toner entrance detection ....................................................................................................28
2.3
3. MfP insTallaTion ..........................................................................................30
3.1 Precautions and Prohibition ................................................................................................30
3.2 MFP Unpacking Procedure .................................................................................................32
MFP Installation Instructions ...............................................................................................33
3.3
Packed Units and Attachments ...........................................................................................34
3.4
Assembly Procedure ...........................................................................................................35
3.5
.1 MFP Main Body .....................................................................................................35
3.5
.2 Power Cable Connection .......................................................................................44
3.5
.3 Installation of Optional Components .....................................................................46
3.5
.4 Confirm the Recognition of Option ........................................................................50
3.5
Configuration Page Print .....................................................................................................51
3.6
Network Information Print ....................................................................................................54
3.7
Connection Procedures.......................................................................................................55
3.8
Checking of User Paper ......................................................................................................59
3.9
4. RePlaCeMenT of PaRTs ..............................................................................60
4.1 Precautions on the replacement of parts ............................................................................60
4.2 Parts layout .........................................................................................................................62
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Oki Data CONFIDENTIAL
4.3 Parts replacement method ..................................................................................................67
4.3.1 Detachment methods of the scanner and printer ..................................................68
.1.1 Cover-Side-R ..........................................................................................68
4.3
.1.2 Cover-Side-L ..........................................................................................69
4.3
.1.3 FAX Board (In case of MB470/480 ) ....................................................70
4.3
.1.4 Detachment methods of the scanner and printer ...................................71
4.3
.2 Scanner .................................................................................................................73
4.3
.2.1 Detachment of the paper tray .................................................................73
4.3
.2.2 Detachment of Pad .................................................................................74
4.3
.2.3 Removing ADF PCBA ............................................................................75
4.3
.2.4 Removing operation panel .....................................................................76
4.3
.2.5 Removing the MPCBA ............................................................................77
4.3
.2.6 Removing ADF Assembly ......................................................................79
4.3
.2.7 Removing the Window-ADF ...................................................................81
4.3
.3 Printer ....................................................................................................................82
4.3
.3.1 LED Head ...............................................................................................82
4.3
.3.2 Roller-Transfer ........................................................................................83
4.3
.3.3 CU Board ................................................................................................84
4.3
.3.4 OP Cover Assy .......................................................................................85
4.3
.3.5 MPT-Assy (In case of MB460, it is Manual-Assy) ..................................86
4.3
.3.6 Front-Guide-Assy ...................................................................................87
4.3
.3.7 Roller-Assy-Feed ....................................................................................88
4.3
.3.8 Guide-Paper-Duplex ...............................................................................89
4.3
.3.9 Stacker-Cover-Assy ................................................................................90
4.3
.3.10 Motor-DC-Main .......................................................................................91
4.3
.3.11 Fuser-Assy ..............................................................................................92
4.3
.3.12 Rear-Cover-Assy ....................................................................................94
4.3
.3.13 Frame-Assy-Lower .................................................................................95
4.3
.3.14 High voltage / Low voltage power board ................................................97
4.3
.3.15 Plate-Bracket-Motor................................................................................99
4.3
.3.16 Roller-Back up ......................................................................................100
4.3
.3.17 Roller-Resist .........................................................................................101
4.3
.3.18 Lever-In-Sensor ....................................................................................102
4.3
.3.19 Lever-Eject-Sensor/Photo-Interrupter ..................................................103
4.3
.3.20 Lever-End/Lever-Duplex/Lever-Cassette/Gear-Assy-Clatch ...............104
4.3
.3.21 Paper feeding roller
4.3
(Roller-Pick-Up, Roller-Feed-NOW, Roller-Assy-MPT) ........................106
5. MainTenanCe Menu ....................................................................................108
5.1 Maintenance Menu ............................................................................................................108
5.1.1 Boot Menu ...........................................................................................................108
.2 System Maintenance Menu ................................................................................. 111
5.1
.3 Fax Maintenance Menu .......................................................................................115
5.1
.4 Print Statistics Menu ............................................................................................ 117
5.1
Maintenance Utility ............................................................................................................119
5.2
Variou s printing of the MFP unit with controller ................................................................121
5.3
Switch pressing function when power supply is turned on ...............................................121
5.4
Settings after Parts Replacement .....................................................................................122
5.5
.1 Notes when exchanging the main circuit board and EEPROM setting after the
5.5
exchange of 86M circuit board .................................................................................122
44306601TH Rev. 2
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Oki Data CONFIDENTIAL
6. PeRioDiC MainTenanCe..............................................................................126
6.1 Periodic Replacement Parts ..............................................................................................126
6.2 Cleaning ............................................................................................................................126
Cleaning of LED lens array ...............................................................................................126
6.3
Cleaning the pick-up roller ...............................................................................................128
6.4
Cleaning the inside of the MFP .........................................................................................129
6.5
Cleaning the papaer path in the ADF ...............................................................................130
6.6
Cleaning the underside of the ADF ...................................................................................132
6.7
Cleaning the Flatbed glass................................................................................................132
6.8
7. TRouBlesHooTing PRoCeDuRes ............................................................133
7.1 Precautions prior to repair .................................................................................................133
7.2 Items to be checked prior to taking action on abnormal images .......................................133
Precautions when taking action on abnormal images ......................................................133
7.3
Preparations for troubleshooting .......................................................................................133
7.4
Troubleshooting method ....................................................................................................133
7.5
.1 LCD Message List ...............................................................................................134
7.5
.2 LCD Message Troubleshooting ...........................................................................183
7.5
.3 Print Troubleshooting ...........................................................................................199
7.5
.4 Response after Flash compulsive initialization ....................................................207
7.5
.5 Network Troubleshooting .....................................................................................208
7.5
.5.1 Connection error occurs with the Web browser ...................................209
7.5
.5.2 Print operation is not possible ..............................................................215
7.5
.5.3 Cannot create Certificate ......................................................................216
7.5
.5.4 Installation of Certificate is not possible ...............................................216
7.5
.5.5 Other questionnaires ............................................................................219
7.5
.5.6 Restrictions when using Internet Explore 7 ..........................................222
7.5
.6 Fax Error Code List ..............................................................................................223
7.5
Fuse Checking ..................................................................................................................225
7.6
8. ConneCTion DiagRaMs ..............................................................................226
8.1 Resistance value ...............................................................................................................226
8.2 Component layout .............................................................................................................228
aPPenDix C MainTenanCe Manual foR seConD TRay uniT ..................234
1 Overview ...........................................................................................................................234
1.1 Function ......................................................................................................................234
Exterior and Parts Name ............................................................................................234
1.2
2. D
3. P
4. C
escription for Operation of Second Tray unit ..................................................................235
art Replacement .............................................................................................................236
Precautions on replacing parts ...................................................................................236
3.1
Arrangement of Parts ..................................................................................................237
3.2
How to Replace Parts .................................................................................................238
3.3
.1 Roller-Pick-Up, Roller-Feed-Now .........................................................239
3.3
.2 Guard-Connector, Connector (9715S-08Z02-G4C) .............................240
3.3
.3 Roller-Feed ...........................................................................................241
3.3
.4 Board-OT7 ............................................................................................242
3.3
.5 CONN Cord-AMP8P-AMP8P ...............................................................243
3.3
.6 Gear-Assy-Clatch .................................................................................244
3.3
.7 Frame-Assy-Retard, Spring-Retard ......................................................246
3.3
leaning of Paper Feed Roller and Separation Roller ......................................................247
44306601TH Rev. 2
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1. ConfiguRaTion
DM
PE
RCLT
THERM
HCLT
MCLT
SON
HVIF
EXRCO
Fax IF
PW
HEAD
PNLUSB
LAN
USB
CENT
DC Motor
Assy.
JST2
2
JST2
2
JST2
2
clutch
clutch
AMP8
8
USB IF
Centronics IF
JST24
24
JST24
Panel PCB
LCD
FB
Moter
CCD UNIT
20
JST20
JST20
Scanner Unit
JST9
9
28 JST28
FAN
2nd
Tray
6
JST7
Board-TT1
cover open switch
JST10
3
Cover open sensor
EXIT sensor
6
3
2
JST2
Temperature sensor
IP100
ALF
UPD7
202
AMP6
JST28
CN1
CN2
CN3
High Volt PCB
3
3
5
2
FUSER UNIT
2
2
AC Inlet
AC SW
2
2
86M
SPILYTAS 2
8051
I2C
16C550
UART
LC98500B
PU LSI
DDR
I/F
10
JST10
Nor
Nand
DIMM
I2C
ROM
64
Kbit
74LVC
161284
3
3
Paper end
duplex
JST9
SCANNER
PCB
L629
SOLENOID
ພ
ROM IF
PCI
ROM IF
PCI
2NDTRAY
LED HEAD UNIT
TXD/
RXD
DP/
DM
DP/DM
HEAD IF
HEAD Clock
RS232C
DP/
DM
RS232C
PUIF
DDR-
SDRAM
64
MB
I2C
DDR IF
IEEE1284
IEEE1284
Cable
FFC
Sensor
BUS
5V
24V
5V
24V
5V
24V
JST2
2
clutch
AFD
Moter
AFD PCB
LAN IF
Power Supply PCB
1.1 System Configuration
MB460
The system configuration of this product is shown in Figure 1-1-1.
Oki Data CONFIDENTIAL
44306601TH Rev. 2
Fig 1.1.1
7 /
MB470/MB480
DM
PE
RCLT
THERM
HCLT
MCLT
SON
HVIF
EXRCO
Fax IF
PW
HEAD
PNLUSB
LAN
USB
CENT
DC Motor
Assy.
JST2
2
JST2
2
JST2
2
clutch
clutch
AMP8
8
USB IF
Centronics IF
JST24
24
JST24
FAX PCB
Panel PCB
LCD
FB
Moter
CCD UNIT
20
JST20
JST20
Scanner Unit
JST9
9
28 JST28
FAN
2nd
Tray
6
JST7
Board-TT1
cover open switch
JST12
JST10
3
Cover open sensor
EXIT sensor
6
3
2
JST2
Temperature sensor
IP100
ALF
UPD7
202
AMP6
JST28
CN1
CN2
CN3
High Volt PCB
3
3
5
2
FUSER UNIT
2
2
AC Inlet
AC SW
2
2
86M
SPILYTAS 2
8051
I2C
16C550
UART
LC98500B
PU LSI
DDR
I/F
10
JST10
Nor
Nand
JST12
12
DIMM
Line
Tel
I2C
ROM
64
Kbit
74LVC
161284
3
3
Paper end
duplex
JST9
SCANNER
PCB
L629
SOLENOID
ພ
ROM IF
PCI
ROM IF
PCI
2NDTRAY
LED HEAD UNIT
TXD/
RXD
DP/
DM
DP/DM
HEAD IF
HEAD Clock
RS232C
DP/
DM
RS232C
PUIF
DDR-
SDRAM
64
MB
I2C
DDR IF
IEEE1284
IEEE1284
Cable
FFC
Sensor
BUS
5V
24V
5V
24V
5V
24V
JST2
2
clutch
AFD
Moter
AFD PCB
LAN IF
Power Supply PCB
Line
Tel
The system configuration of this product is shown in Figure 1-1-2.
Oki Data CONFIDENTIAL
44306601TH Rev. 2
Fig 1.1.2
8 /
1.2 Structure of MFP
A
A
A’
A’
The insides of MB460/MB470/MB480 printers are composed of the following parts.
• Scanner part
• Electronic photography process part
• Paper path
• Control part (CU part/PU part)
• Power supply parts (high voltage part/low voltage part)
Figure 1-2 shows the composition of the MFP.
Oki Data CONFIDENTIAL
Fig 1.2.1
44306601TH Rev. 2
9 /
1.3 Offer of Options
This product can be installed with the following option.
(1) Additional memory board 64MB/256MB
Fig 1.3.1
Oki Data CONFIDENTIAL
(2) Option Tray
Fig 1.3.2
44306601TH Rev. 2
10 /
Oki Data CONFIDENTIAL
1.4 Specifications
Table 1.4.1
Category Item MB460 MB470 MB480
Exterior
Dimensions
Weight 17Kg 18.5Kg 19Kg
printer Engine Engine speed (A4/Letter) 28/30 PPM
Fast print time
(A4)
Resolution LED Head 600dpi 1200dpi
CPU Core PowerPC405
RAM Standard 64MB
ROM Program NOR-Flash 2MB + NAND-Flash 64MB
Power
Consumption
Operation
Environment
(temperature)
Operation
Environment
(humidity)
Duty Cycle Maximum 50,000 pages per month 70,000 pages per
Life Printer 180,000 pages or 5 years
Width 447mm 447mm
Depth 432mm 432mm
Height 500mm 529mm
Auto Duplex Standard
First Print Out Time Less than 5.5 seconds
Warm-up Time from Power On 60 seconds
from Power Save 25 seconds
Low noise mode Unavailable
Maximum input resolution F/B:1200 x 600dpi / ADF:1200 x 300dpi
Output resolution 600x600dpi
1200x600dpi
2400x600dpi(half
speed)
step 4 step 600 x 600dpi
Economic mode toner saving by lowering light
I-Cache 16KB
D-Cache 16KB
Clock 297MHz
Bus width 32bit
Option 64MB/256MB available (SO-DIMMx1)
Max. 800W
Normal Operation 500W
Stand-by 100W
Power Saver Mode 10W or less
Energy Star Application Yes
In operation 10
At stand-by 0 - 43 , power off
In storage (1 year max.) -10
At transport (1 month max.) -29
At transport (1 month max.) -29
In operation 20%-80%, 50%-70%
At stand-by 10%-90%, Max. wet bulb temperature : 26.8 with
In storage 10%-90%, Max. wet bulb temperature : 35
At transport 10%-90%, Max. wet bulb temperature : 40
Scanner Flatbed:50,000pages or 5years / ADF:240,000 pages
Duty cycle (M=L/12, A=L/12/5) 35,000 pages per month max.
MTBF (2.3% duty) 6,000 hours
MPBF 24,000 pages
MTTR 30 minutes
Toner
life@ISO19752
consumption 3,500
Starter 1500
- 50 , with drum and without toner
Max. wet bulb temperature : 25
5,000 pages per month average
- 32 , 17 - 27
- 43 , with drum and toner
- 50 , with drum and toner
7,000
1200x1200dpi
600x600dpi
power off
month
or 5years
3,500
7,000
12,000
44306601TH Rev. 2
11 /
Oki Data CONFIDENTIAL
Category Item MB460 MB470 MB480
Life Image drum life
(w/o power save)
Operation noise Operating 56dB
Standby 32dB
Power save mode Back ground level
Paper handling Paper Input
Capacity
Paper Output
Capacity
Paper Size Legal/universal or A4 cassette/
Universal cassette
MP Tray 13,13.5,14Legal,Letter,Executive,A4,A5,B5,A6,C5,C6,DL
Duplex Letter,A4,up to Legal14"
Minimum paper
size
Paper Weight 1st Tray 16~32 lb. (60.16~120.32gsm)
Status switch/
Sensor
Communication
Interface
Emulation Standard PCL6/5e , SIDM PCL6/5e , SIDM , PS3
Option RAM RAM DIMM 1slot (64MB or 256MB)
Others USB-IF logo Available
1st Tray 3.94"x8.3" (210mm)
2nd Tray 5.8"x8.3"(210mm,A5)
MP Tray 3.4"x5.5"(140mm)
Duplex Auto Duplex Letter,A4;Manual Duplex 3.4"x5.5"
2nd Tray 16~32 lb. (60.16~120.32gsm)
MP Tray 16~43 lb. (60~160gsm) (Enve. : N/A)
Duplex Print 16~28 lb. (60.16~105.28gsm)
Paper tray empty Available
Paper low N/A
Toner Empty Available
Cover open Available
Fuser temp Available
Paper size N/A
Stacker full N/A
USB Host IF N/A
USB Device IF USB connector Type B (2.0 Hi-Speed)
Ethernet I/F RJ-45 (10/100 Base TX)
Tel/Line I/F N/A RJ-11x2 (PSTN/PBX , Ext-TEL)
Parallel I/F CEN36 (IEEE1284)
Wireless LAN N/A
Card Slots N/A
Option N/A
2nd tray 530 sheet tray
Emulation N/A
Windows logo Available
Operation by UPS Operation by UPS (outage free power supply) is not
Continuous 25,000 pages (at simplex)
3 pages per job 20,000 pages (at simplex)
1 page per job 12,000 pages (at simplex)
1st Tray Legal/universal cassette
250 sheets
2nd Tray (optional) Legal/universal cassette 530 sheets
MP Tray Single sheet
manual feed slot
Face up N/A
Face down 150 sheets
13,13.5,14Legal,Letter,Executive,A4,A5,B5
statement(first cassette only)
,Com-9,Com-10,Monarch,statement,Free
guaranteed. (Do not use UPS)
50 sheets Multi Purpose Tray
Free
Legal/universal
cassette
530 sheets
44306601TH Rev. 2
12 /
2
3 4
1
1.5 Interface Specification
1.5.1 USB Interface Specification
1.5.1.1 Outline of USB Interface
(1) Basic Specification
USB
(2) Transmission Mode
Hi speed (480Mbps±0.05% max.)
(3) Power Control
Self power device
1.5.1.2 USB Interface Connector and Cable
(1) Connector
• Printer side: B receptacle
Upstream port
Equivalent of UBR24-4K5C00 (made by ACON)
Oki Data CONFIDENTIAL
Connector pin arrangement
Fig 1.5.1
• Cab
le side: B plug (off)
(2) Cable
Cable length: Specification Cable of USB2.0 spec. of less than 5m.(less than 2m is
recommended)
(
Shielded cable is used here.)
1.5.1.3 UBS Interface Signal
Table 1.5.1
Name of Single Function
1 Vbus Power Supply (+5V)(red)
2 D - Data transmission (white)
3 D + Data transmission (green)
4 GND Single ground (black)
Shell Shield
44306601TH Rev. 2
13 /
1 8
1.5.2 Network Interface Specification
1.5.2.1 Outline of Network Interface
Table 1.5.2 Basic Specification of Network Interface
Protocol Family Network Protocol Application
TCP/IP ARP,IP,ICMP,IPv6,TCP,UDP LPR,Port9100,FTP,HTTP,HTTPS,IPP,
SNMPv1/v3,TELNET,DHCP/BOOTP,DNS,
DDNS,WINS,UPnP,Bonjour,SNTP,SMTP,
POP3,Windows Rally(WSD Print,LLTD),
ODNSP,SSL/TLS,LDAP,Kerberos
NBT/NetBEUI SMB,NetBIOS,NetBIOS over TCP
EtherTalk ELAP,AARP,DDP,AEP,NBP,ZIP,R
TMP,ATP,PAP
IEEE802.1X EAP-TLS,PEAP
Oki Data CONFIDENTIAL
1.5.2.2 Network Interface Connector and Cable
(1) Connector
100 BASE-TX/10 BASE-T (automatic switch, no simultaneous use)
Connector pin arrangement
Fig 1.5.2
(2)
Cable
Unshielded twist pair cable with RJ-45 connector (Category 5 is recommended.)
1.5.2.3 Network Interface Signal
Table 1.5.3
Pin No. Singles Single Direction Functions
1 TXD+ FROM PRINTER Send Data +
2 TXD- FROM PRINTER Send Data 3 RXD+ TO PRINTER Received Data +
4 - - Unassigned
5 - - Unassigned
6 RXD- TO PRINTER Received Data 7 - - Unassigned
8 - - Unassigned
44306601TH Rev. 2
14 /
1.5.3 Telephone Line Interface Specification (Only MB470/MB480)
A1 A6
B1 B6
TEL
LINE
1.5.3.1 Outline of telephone Line Interface
The machine will reliably communicate with distant stations over voice-level telephone line.
1.5.3.2 Telephone Line Interface Connector and Cable
Printer side : RJ-11
Cable side : TEL Cable (Cable with plug)
Connector contact arrengement
Oki Data CONFIDENTIAL
1.5.3.3 Telephone Line Interface signal
Contact No. Functions
TEL A1 Unspecified
A2 Unspecified
A3 TCP
A4 TCP
A5 Unspecified
A6 Unspecified
LINE B1 Unspecified
B2 Unspecified
B3 TCP
B4 TCP
B5 Unspecified
Fig 1.5.3
Tabel 1.5.4
TCP : Terminal Connection Point
44306601TH Rev. 2
B6 Unspecified
15 /
1.5.4 Parallel Interface Specifications
118
1936
1.5.4.1 Parallel Interface Overview
Table 1.5.5
Item Details
Corresponding mode Comatible mode, nibble mode, ECP mode
Data bit length Compatible: 8, Nibble: 4, ECP: 9 bit
1.5.4.2 Parallel Interface Connector and Cable
(1) Connector
Printer: 36pConnector (Female)
57LE-40360-12 (D56) (DDK Ltd.) equivalent product
Cable: 36pConnector (Male)
57FE-30360-20N (D8) (DDK Ltd.) equivalent product
Oki Data CONFIDENTIAL
Pin arrangement from interface cable side
Fig 1.5.4
Cable
(2)
Use a cable shorter than 1.8m.
(Use a cable with a shielded twisted-pair wire for to prevent noise interference.)
1.5.4.3 Parallel Interface Level
Low Level : 0.0V to +0.8V
High Level : +2.4V to +5.0V
44306601TH Rev. 2
16 /
2. oPeRaTional exPlanaTion
2.1 Electrophotographic process mechanism
(1) Electrophotographic process
The following describes the overview of electrophotographic process.
1. Charging
Equally charge the surface of image drum by implying negative voltage to the
charged roller due to negative charge.
2. Exposure
The light from LED Head is exposed on the negative-charged surface of image drum.
The surface electrical potential of the exposed part of image drum surface becomes
lower. Then forms electrostatic latent image.
3. Development
Negative-charged toner is attracted to the electrostatic latent image due to
electrostatic while touching the image drum. Then forms viewable image.
4. Transfer
Overlap paper on the surface of OPC drum, from the backside of paper transfer
toner image to the paper by applying electrical charge by transfer roller.
5. Drum cleaning
The remaining toner on the image drum that is not transferred is made to be
equable by cleaning roller. And is temporarily attracted to the cleaning roller due to
electrostatic.
6. Fusing
The toner image that is transferred to paper is fused on paper by heat and pressure.
Oki Data CONFIDENTIAL
44306601TH Rev. 2
17 /
Oki Data CONFIDENTIAL
Image drum
Charged roller
Power
Charged roller
LED head
LED head
Image drum
Image drum
Paper
Power
1. Charging
Charge the image drum surface by implying voltage to the charged roller that contacts the image
drum surface.
Fig 2.1.1
2. Exposure
The light emitting from the LED Head will be exposed to the negative charged image drum. When
the surface electric potential of exposed part of the image drum goes to decrease, the electrostatic
latent image complying with image signal is formed.
Image drum is coated by basic layer (UL), charge generating layer (CGL), charge transferring layer
(CTL) on the basic material aluminum. The thickness of the organic light sensor (OPC) that is
consisted by CTL and CGL is approximate 20µm.
44306601TH Rev. 2
Fig 2.1.2
18 /
Oki Data CONFIDENTIAL
Image drum
Charged roller
Image developing plate
Toner supply roller
Image
developing
roller
3. Image development
Toner is attracted to the electrostatic latent image on the image drum surface, then the electrostatic
latent image changes to toner image.
1 As
the roller on the supply spot of toner rotates while scrubbing the image-developing
roller, fiction electricity occurs between the image developing roller and toner; toner is
attracted to the image-developing roller.
e toner that has been attracted to the image-developing roller is dropped down to
2. Th
the developing plate to make a thin toner film on the image developing roller side.
Fig 2.1.3
3 The toner is attracted by the exposed part (Low electrical potential part) of the image
drum when the image drum contact the image developing roller, so as to see the
electrostatic latent image.
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Oki Data CONFIDENTIAL
Image drum
Basic material
Toner feeding roller
While the cover is closed it will be
connected and bias will be applied.
Image developing roller
Note! The necessary bypass voltage in image processing is impressed on the toner feeding
roller and image developing roller as show below.
Fig 2.1.4
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Oki Data CONFIDENTIAL
Image drum
Transfer roller
Paper
Power
4. Transfer
The transfer roller, which is from conductive sponge material, is created to meet intimate
attachment of image drum roller surface and feeding paper. The feeding paper is set up on the
surface of image drum. Plus charge, which is the converse polarity with toner polarity, is applied
from the backside of the paper.
As high plus voltage is applied to transfer roller from the power supply, the plus charge on the
transfer roller surface is induced and transferred to the paper while the paper contact the transfer
roller. The negative charged toner, which has been attracted to the image drum surface, is
transferred to the surface of feeding paper by the plus charge of the backside of the paper.
Fig 2.1.5
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Oki Data CONFIDENTIAL
Power supply
Cleaning roller
Image drum
Transferring roller
5. Drum cleaning
1 Cleaning
After the completion of transferring, the remaining toner on the image drum is temporarily
attracted by the electrostatic and the image drum surface is cleaned.
Fig 2.1.6
2 Roller cleaning
In the following case, there is a need of cleaning the charged roller, transfer roller, and
cleaning roller.
•
Warming up as switching on the power supply
•
Warming up after open-close of the cover
•
In case of termination of printing operation
•
By periodically change the bias voltage that is implied to each roller during continuous
printing, transfer the attached toner from roller to image drum and then return it to
developing device.
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Oki Data CONFIDENTIAL
Separating clutch
Feeding paper
Heater
Heat roller
Thermistor
Backup roller
Pressuring spring
Thermostat
6. Fusing
After the termination of transfer the unsettled toner image is settled to paper by heat and pressure
while passing between Heat roller and Back up roller. Heat roller is Teflon coated and is mounted
by heater that can generate heat (Halogen lamp).
The thermistor that contacts the Heat roller adjusts the Heat roller temperature to the temperature
specified by the menu complying with the paper width. For safety the thermostat shuts off the
voltage supply to the Heater by opening the thermostat in the case of abnormally temperature
increasing.
The back up roller is held by the pressure springs on each terminal due to the pressure applied.
Fig 2.1.7
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Oki Data CONFIDENTIAL
：
：
：
：
：
：
：
：
：
Face down stacker
Face up stacker
The 2nd ejecting roller
The 1st ejecting roller
Backup roller
Duplex unit
Ejecting
sensor lever
Resist roller
MPT feeding roller
Multipurpose tray
Conveying roller
Conveying roller
Transferring roller
Pulse motor
Paper conveying route
Driving roller (Continuous rotation)
Driving roller (Control rotation)
Driving roller
Paper level indicator lever
Indicating lever
Photo sensor
Micro switch
Magnetic clutch
Solenoid
DC motor
Heat roller
Conveying roller
Pick up roller
Pick up roller
Feeding roller
Feeding roller
Tray 1
Tray 2
2nd tray unit (option)
Entrance
sensor lever
Image drum
Writing out
sensor lever
2.2 Printing process
The paper fed from Tray 1 and Tray 2 is conveyed by feeding roller, conveying roller, and resist
roller. When feeding paper is from MPT, it is conveyed by MPT, feeding roller, and resist roller.
After that the feeding paper that is conveyed by image drum and the nip part of transfer roller
forms toner image on the paper through electrophotographic process. And then, the toner on the
paper is fused by the heat and pressure as the fuser unit passing through. The paper that fused
the toner image is ejected from the face down stacker of the ejecting roller. In the case of face
up ejecting, it needs to open the backside cover and install face up stacker. (It is unavailable for
duplex printing while it is face up ejecting.)
The above is about the operations at simplex printing, yet the below explains the operations at
duplex printing. While duplex printing, the paper, which firstly passed through the fuser unit after
the backside printing, is conveyed to the inward of Duplex Unit, by the reverse operation of the
second ejecting roller that is a certain time after removing the first ejecting roller of the paper rear
side. Paper, is conveyed by conveying roller of Duplex Unit, and then merges to the same route
with the feeding paper that is from the tray. Onwards, it is the same with the simplex printing
operation by the feeding paper from tray.
44306601TH Rev. 2
Fig 2.2.1
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Oki Data CONFIDENTIAL
Resist roller
Resist clutch
Entrance sensor lever
Conveying roller
Paper feeding roller
Pick up roller
DC motor
(Counterclockwise rotation)
Paper feeding clutch
Paper
Writing out sensor lever
Resist clutch
Writing out sensor lever
Resist roller
Entrance sensor lever
Paper feeding clutch
MPT paper feeding roller
Paper
DV motor
(Counterclockwise rotation)
(1) Paper feeding from Tray 1
1. As DC motor rotating (Counterclockwise rotation), if set the paper feeding clutch as ON,
as the paper feeding roller and pick up roller rotating, the paper that is inside the tray is
conveyed.
2. T
he paper is conveyed by the conveying roller. After the entrance sensor level set to be ON,
it bumps into the stopping resist roller, a certain more amount of paper is conveyed. (This
corrects the paper skew.)
f set the resist clutch as ON, the paper is conveyed by resist roller.
3. I
Fig 2.2.2
(2) Paper feeding from Multipurpose tray (MPT)(MB470,MB480)
1. As DC motor rotating (Counterclockwise rotation), if set paper feeding clutch as ON the MPT
paper feeding roller starts to rotate, the paper in the tray is conveyed.
fter setting the entrance sensor lever as ON, the paper bumps into the stopping resist roller, a
2. A
certain more amount of paper is conveyed. (This corrects the skew of paper.)
f set the resist clutch as ON, the paper is conveyed by resist roller.
3. I
44306601TH Rev. 2
Fig 2.2.3
25 /
(3) Fuser unit and paper ejecting
Eject roller
Eject roller
Planet gear
Paper route
Solenoid
Fuser unit
Heat roller
DC motor
(Counterclockwise rotation)
1. The fuser unit and eject roller is
2. Si
multaneously the eject roller rotates, and then the paper is ejected.
Oki Data CONFIDENTIAL
Fig 2.2.4
44306601TH Rev. 2
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Oki Data CONFIDENTIAL
Fuser unit
Fuser unit
Heat roller
Heat roller
DC motor
(Counterclockwise rotation)
DC motor
(Counterclockwise rotation)
Resist roller
Resist roller
Resist clutch
Resist clutch
Resist Entrance
sensor lever
Resist Entrance
sensor lever
Duplex conveying roller
Writing out
sensor lever
Writing out
sensor lever
Duplex conveying roller
The 1st ejecting roller
The 1st ejecting roller
The 2nd ejecting
roller
The 2nd ejecting
roller
Planet gear
Planet gear
Solenoid
(OFF)
Solenoid
(ON)
[ Normal rotation ]
[ Inverse rotation ]
Belt
Duplex conveying rollerDuplex conveying roller
Belt
(4) Paper reversing and paper multi-feeding
1. TRemoving the first eject roller at the rear part of paper and set the solenoid as ON for a
while, then the planet gear starts to move, the second eject roller starts inverse rotating
(Counterclockwise rotation).
2. B
y the inverse rotation of the second eject roller the paper is inversely rotated and conveyed to
Duplex.
aper is conveyed by Duplex conveying roller.
3. P
fter setting the entrance sensor lever as ON, paper bumps into the stopped resist roller, still a
4. A
certain more amount of paper is conveyed. (This corrects the skew of paper.).
f set the Resist clutch as ON, paper is conveyed by Resist roller.
5. I
Fig 2.2.5
44306601TH Rev. 2
Fig 2.2.6
27 /
Oki Data CONFIDENTIAL
Magnet
Agitating bar Agitating gear
Crack part
Agitating bar
Agitating bar
Agitating gear
Sensor plate
Sensor plate
Toner sensor
2.3 Toner entrance detection
• Equipment
Toner entrance detecting equipment consists the agitating gear that agitating the agitating bar at
a certain speed and magnet that is on the agitating bar.
Fig 2.3.1
•
Operation
Detecting the toner low by monitoring the congruous time intervals between the magnet that is
set on the sensor plate and the magnet attached on the agitating bar,
Operation in toner full status
•
The crack part of agitating gear meshing with
the projection portion of agitating bar, the
agitating bar rotates in accordance with the
rotating of gear.
•
Even after the magnet part of the agitating
Bar reaches the highest position, it still
rotates at the same speed by the pressure of
the agitating gear due to the toner resistance.
Fig 2.3.2
Operation in toner low status
•
When the magnet part of the agitating bar
reaches the highest position, because
there is no resistance from toner, the
agitating bar drops earlier than the gear
by the gravity itself, and stops by that
status.
For this reason, the time that the magnet
of agitating Bar magnetic attracts the
magnet of sensor plate becomes longer.
The toner low status can be inspected by
Fig 2.3.3
monitoring this time.
44306601TH Rev. 2
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Toner full status
Oki Data CONFIDENTIAL
Fig 2.3.4
Toner low status t1
ner sensor alarm actuates if there is not any change on toner sensor.
• To
• Toner sensor is not monitored while main (drum) motor is stopping.
t2 t1,t2: Magnet attracting time
Fig 2.3.5
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Oki Data CONFIDENTIAL
3. MfP insTallaTion
3.1 Precautions and Prohibition
Table 3.1.1
• Do not install the MFP in the vicinity of high temperature or fire.
• Do not install the MFP at the place where a chemical reaction may take place (laboratory,
etc.).
• Do not install the MFP near flammable solution like alcohol, thinner, etc.
• Do not install the MFP at the place where a small child can reach.
• Do not install the MFP at an unstable place (unsteady frame, tilted place, etc.).
• Do not install the MFP at a highly humid or dusty place or under the direct sunshine.
• Do not install the MFP under the environment of sea breeze or caustic gas.
• Do not install the MFP at a highly vibrating place.
• When you drop the MFP or damage the cover, remove the power plug from the outlet and
contact the Customers’ Service Center.
Electric shock, fire or injury may occur.
• Do not connect the power cord, printer cable and earth wire as otherwise directed by the
Manual. A fire may break out.
• Do not insert a thing in the vent hole.
Electric shock, fire or injury may occur.
• Do not place a cup with water on the MFP.
Electric shock or fire may occur.
• Do not touch the fuser unit when you open the printer cover.
Burn may occur.
• Do not throw the toner cartridge or image drum cartridge into fire.
Burn may occur by the dust explosion.
• Do not use a highly flammable spray near the MFP.
Fire may break out as there are high temperature parts inside the printer.
• When the cover becomes abnormally hot, a smoke arises or a strange odor comes out,
remove the power plug from the outlet and contact the Customers’ Service Center.
Fire may break out.
• When liquid like water drops inside the MFP, remove the power plug from the outlet and
contact the Customers’ Service Center.
Fire may break out.
• When a thing like a clip drops inside the MFP, remove the power plug from the outlet and
take out that thing.
• Do not operate or disassemble the MFP as otherwise directed in the Manual.
Electric shock, fire or injury may occur.
44306601TH Rev. 2
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