Oki MB461MFP User manual

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MB461 / MB471 / MB491 /
MB491+ / MB491+LP/ MPS4200mb /MPS4700mb
Maintenance Manual
031314C
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Copyright Information
Copyright © 2014 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

44871001TH Rev.6 iii /
Oki Data CONFIDENTIAL
This manual explains the maintenance methods of Multi- Function Printer(MFP).The target
model is as follows.
MB441/MB451/MB451w/MB461/MB461+LP/MB471/MB471w/MB491/MB491+/MB491+LP/
ES4161 MFP/ES4191 MFP/MPS4200mb/MPS4700mb
This manual is prepared for the maintenance person. In regard to the handling methods of
these MFP, please refer to the User’s Manual.
The description of a derivation model is omitted at this manual. Please substitute for a
derivation model to each typical model as a following correlation table.
Correlation table of each model
Model
Derivation Typical
ES4161 MFP/MB441/MB461+LP MB461
MB451 MB471
MB451w MB471w
MB491+/MB491+LP/ES4191 MFP/
MPS4200mb/MPS4700mb
MB491
Refer to the 1-4 specifications for the difference in each model.
Note! • Contentsofthismanualissubjecttochangewithoutnotice.
 • 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startingthemaintenancework,pleaseneutralizethestaticelectricity.
PREFACE
PREFACE
Risk of explosion if battery is replaced by an incorrect type.
Battery of the printer need not to be replaced. Do not touch the
battery.
Replace the whole board to replace the SU board (MHE).
In the case of replacing batteries at board repairs, replace with the
specified type ones. Installation of another type batteries may result in
explosion.
Caution for used batteries are as follows; do not recharge, force open,
heat or dispose of in fire.

44871001TH Rev.6 iv /
Oki Data CONFIDENTIAL
CONTENTS
CONTENTS
1. CONFIGURATION .................................................................1-1
1.1 System configuration ......................................................................................1-2
1.2 Structure of MFP .............................................................................................1-3
1.3 Offer of Options ...............................................................................................1-4
1.4 Specifications ..................................................................................................1-5
1.5 Interface specifications .................................................................................1-25
1.5.1 USB Interface Specification......................................................................1-25
1.5.1.1 Outline of USB Interface...................................................................1-25
1.5.1.2 USB Interface Connector and Cable ................................................1-25
1.5.1.3 USB Interface Signal ........................................................................1-25
1.5.2 Network Interface Specification................................................................1-26
1.5.2.1 Outline of Network Interface.............................................................1-26
1.5.2.2 Network Interface Connector and Cable ..........................................1-26
1.5.2.3 Network Interface Signal ..................................................................1-26
1.5.3 Telephone Line Interface Specification (MB451/MB451w/MB471/MB471w/
MB491/MB491+/MB491+LP/ES4191 MFP/MPS4200mb/MPS4700mb) ...1-27
1.5.3.1 Outline of telephone Line Interface ..................................................1-27
1.5.3.2 Telephone Line Interface Connector and Cable ...............................1-27
1.5.3.3 Telephone Line Interface signal........................................................1-27
1.5.4 USB Host Interface...................................................................................1-27
1.5.4.1 Outline of USB Host Interface ..........................................................1-27
1.5.4.2 USB Host Interface Connector .........................................................1-27
1.5.4.3 USB Host Interface Signal................................................................1-27
1.5.5 Wireless LAN Interface(MB451w/MB471w) .............................................1-28
1.5.5.1 Outline of Wireless LAN ......................................................................1-28
2. OPERATIONAL EXPLANATION............................................2-1
2.1 Electrophotographic process mechanism .......................................................2-2
2.2 Printing process ...............................................................................................2-6
2.3 Toner entrance detection .................................................................................2-9
2.3.1 Toner sensor detection principle ................................................................2-9
2.3.2 Toner count principle ..................................................................................2-9
2.4 Image Scanning process ...............................................................................2-10
2.4.1 Structure and process of RADF ...............................................................2-10
2.4.1.1 Cross-section view ...........................................................................2-10
2.4.1.2 Electrical configuration .....................................................................2-10
2.4.1.3 Fundamental operations...................................................................2-11
2.4.1.4 Document detection .........................................................................2-14
2.4.1.5 Jam detection ...................................................................................2-15
2.4.2 Document table structure .........................................................................2-15
2.4.2.1 Overview ..........................................................................................2-15
2.4.2.2 Exposure block.................................................................................2-16
2.4.2.3 Carraige-Assy drive mechanism ......................................................2-16
3. MFP INSTALLATION .............................................................3-1
3.1 Precautions and Prohibition.............................................................................3-2
3.2 MFP Unpacking Procedure .............................................................................3-3
3.3 MFP Installation Instructions ...........................................................................3-4
3.4 Packed Units and Attachments .......................................................................3-5
3.5 Assembly Procedure .......................................................................................3-6
3.5.1 MFP Main Body .........................................................................................3-6
3.5.2 Power Cable Connection..........................................................................3-14
3.5.3 Installation of Optional Components ........................................................3-16
3.5.3.1 Second Tray Unit ..............................................................................3-16
3.6 Configuration Page Print................................................................................3-20
3.7 Network Information Print ..............................................................................3-22
3.8 Connection Procedures .................................................................................3-23
3.9 Checking of User Paper .................................................................................3-27

44871001TH Rev.6 v /
Oki Data CONFIDENTIAL CONTENTS
4. REPLACEMENT OF PARTS .................................................4-1
4.1 Notes on replacement of parts.........................................................................4-2
4.2 Part replacement procedure ............................................................................4-4
4.2.1 Cover Side (L) ............................................................................................4-4
4.2.2 Cover Side(R) / SD Card............................................................................4-5
4.2.3 Board 98M..................................................................................................4-6
4.2.4 PWR unit ....................................................................................................4-7
4.2.5 Cover Stay(R) / Cover Stay(L)....................................................................4-9
4.2.6 Cover Front (Top) .....................................................................................4-10
4.2.7 SW Assy...................................................................................................4-11
4.2.8 Scanner unit .............................................................................................4-12
4.2.8.1 Tray-assy-document / Cover-ADF-R-assy........................................4-14
4.2.8.2 ADF-unit ...........................................................................................4-15
4.2.8.3 Sheet-document / Paper-weight-assy / Spring-PW-ADF..................4-16
4.2.8.4 Hinge-assy-L / Hinge-assy-R ...........................................................4-17
4.2.8.5 Cover-ADF-F / Guide-assy-exit-sub / ADF-assy /
ADF board (MHD) ............................................................................4-18
4.2.8.6 Cover-assy-top-ADF / Guide-assy / Roller / Motor / Clutch /
Solenoid ...........................................................................................4-20
4.2.8.7 Guide-A-sub / Frame-assy-separator / Spring-separator /
Rubber-friction..................................................................................4-21
4.2.8.8 Cable (ADF-Rev SNS)......................................................................4-21
4.2.8.9 Cable (ADF-Reg SNS) .....................................................................4-22
4.2.8.10 Frame-assy-OP ................................................................................4-22
4.2.8.11 Frame-OP-panel / OPE board (Except MB441/MB461/MB461+LP/
ES4161 MFP)...................................................................................4-23
4.2.8.12 Frame-OP-panel / OPE board (MB441/MB461/MB461+LP/
ES4161 MFP)...................................................................................4-24
4.2.8.13 LCD-assy..........................................................................................4-25
4.2.8.14 Frame-assy-FB.................................................................................4-26
4.2.8.15 How to remove Battery (SU Board MHE).........................................4-28
4.2.8.16 Frame-assy-hopping-ADF ................................................................4-29
4.2.9 Plate Stay L / Plate Assy Stay R ..............................................................4-30
4.2.10 LED Head.................................................................................................4-31
4.2.11 Frame-Assy-TR ........................................................................................4-31
4.2.12 Duplex Belt Assy ......................................................................................4-32
4.2.13 DC Motor .................................................................................................4-32
4.2.14 Hopping Clutch / MPT Clutch / Regist Clutch ..........................................4-34
4.2.15 HV-Board / Motor-FAN ............................................................................4-37
4.2.16 Cover Assy Stacker ..................................................................................4-38
4.2.17 Stacker Cover...........................................................................................4-40
4.2.18 Fuser Assy ...............................................................................................4-41
4.2.19 MPT Assy, Manual Assy...........................................................................4-44
4.2.20 Cover Assy Rear ......................................................................................4-45
4.2.21 Guide Eject Lower Assy ...........................................................................4-48
4.2.22 Eject Motor ...............................................................................................4-49
4.2.23 Plate Side R Assy / Plate Side L Assy / Front Assy .................................4-50
4.2.24 Plate Side L Assy .....................................................................................4-51
4.2.25 Plate Side R Assy ....................................................................................4-52
4.2.26 Front Assy ................................................................................................4-53
4.2.27 Roller Feed Assy......................................................................................4-53
4.2.28
Lever In Sensor / Lever WR Sensor / Photo Interrupter....................................4-54
4.2.29 Paper feeding roller (Roller-Pick-Up, Roller-Feed-NOW, Roller-Assy-MPT) ..4-55
4.2.30 Frame-Assy-Retard, Spring-Retard..........................................................4-57
4.2.31 W-LAN Board ( for MB471w only) ............................................................4-58
5. LUBRICATION POINT ...........................................................5-1
5.1 Lubrication point...............................................................................................5-2
5.1.1 Printer.........................................................................................................5-3
5.1.2 Scanner....................................................................................................5-11
6. MAINTENANCE MENUS.......................................................6-1
6.1 Maintenance Menu ..........................................................................................6-2
6.2 Service Bit Menu............................................................................................6-10

44871001TH Rev.6 vi /
Oki Data CONFIDENTIAL
6.3 Maintenance Utility.........................................................................................6-11
6.3.1 Maintenance Utility...................................................................................6-11
6.4 Self-diagnostic mode .....................................................................................6-13
6.4.1 Operator Panel .........................................................................................6-13
6.4.2 Ordinary self-diagnostic mode (level 1)....................................................6-16
6.4.2.1 Entering self-diagnostic mode (level 1) ............................................6-16
6.4.2.2 Exiting self-diagnostic mode.............................................................6-16
6.4.2.3 Switch scan test ...............................................................................6-17
6.4.2.4 Motor clutch test...............................................................................6-19
6.4.2.5 Test print...........................................................................................6-21
6.4.2.6 Consumable item counter display ....................................................6-24
6.4.2.7 Number of print copies counter display ............................................6-24
6.4.2.8 Switching between the Factory mode and the Shipping mode ........6-25
6.4.2.9 Self-diagnostic function setting.........................................................6-25
6.4.2.10 LED head serial number display .....................................................6-26
6.4.2.11 NVRAM parameter setting ..............................................................6-26
6.4.3 Adjustment at part replacement ...............................................................6-27
6.4.3.1 EEPROM data upload / download method.......................................6-27
6.5 Switch pressing function when power supply is turned on.............................6-28
6.6 Settings after Parts Replacement ..................................................................6-29
6.6.1 Notes on CU/PU board (98M) replacement .............................................6-29
6.6.2 Notes on SU board (MHE)/Scanner Unit replacement .................................. 6-32
7. REGULAR MAINTENANCE ..................................................7-1
7.1 Periodic Maintenance ......................................................................................7-2
7.1.1 Periodic Replacement Parts.......................................................................7-2
7.1.2 Cleaning .....................................................................................................7-2
7.1.3 Cleaning of LED lens array ........................................................................7-2
7.1.4 Cleaning the Feed rollers and the Retard roller .........................................7-3
7.2 Cleaning Rollers in the ADF ............................................................................7-4
7.3 Cleaning the Document Glass .........................................................................7-5
8. TROUBLESHOOTING PROCEDURES ................................8-1
8.1 Precautions prior to repair................................................................................8-2
8.2 Items to be checked prior to taking action on abnormal images......................8-2
8.3 Precautions when taking action on abnormal images .....................................8-2
8.4 Preparations for troubleshooting......................................................................8-2
8.5 Troubleshooting method...................................................................................8-3
8.5.1 LCD messages list .....................................................................................8-3
8.5.2 Service Call List .......................................................................................8-32
8.5.3 Fax Error List............................................................................................8-36
8.5.4 Email/Internet FAX/FAX Server Error List ................................................8-37
8.5.5 Preparing for troubleshooting ...................................................................8-38
8.5.6 Print Troubleshooting................................................................................8-65
8.5.7 Response after Flash compulsive initialization.........................................8-70
8.5.8 Copy Image Abnormality Error Troubleshooting.......................................8-70
8.5.9 Network Troubleshooting..........................................................................8-71
8.5.10 Wireless Troubleshooting .........................................................................8-72
8.6 Fuse Checking ...............................................................................................8-73
9. CONNECTION DIAGRAMS .................................................9-1
9.1 Check of resistance values .............................................................................9-2
9.2 Layout of parts ................................................................................................9-4
9.3 Firmware Information ....................................................................................9-13
9.3.1 ROM control numbers ..............................................................................9-13
9.3.2 Instruction of FW update ..........................................................................9-13
9.3.3 Checking and indication of the revision number.......................................9-14
9.3.4 Stamp of maintenance board indication...................................................9-14
9.3.5 FW Update flow in case of Error 049 (for MB451, MB451w) ...................9-15
10. APPENDIX ........................................................................10-1
10.1 List of Initialized range..................................................................................10-2
10.2 Maintenance Manual for Second Tray unit ...................................................10-9

44871001TH Rev.6 vii /
Oki Data CONFIDENTIAL
10.2.1 Overview ..................................................................................................10-9
10.2.1.1 Function............................................................................................10-9
10.2.1.2 Exterior and Parts Name ..................................................................10-9
10.2.2 Description for Operation of Second Tray unit........................................10-10
10.2.3 Part Replacement ..................................................................................10-11
10.2.3.1 Precautions on replacing parts.......................................................10-11
10.2.3.2 Arrangement of Parts .....................................................................10-12
10.2.3.3 How to Replace Parts.....................................................................10-13
10.2.4 Cleaning of Paper Feed Roller and Separation Roller ...........................10-19
10.2.5 Procedure for Troubleshooting ...............................................................10-20
10.2.5.1 Precautions for Troubleshooting .....................................................10-20
10.2.5.2 Preparation before Troubleshooting................................................10-20
10.2.6 Connection Diagram...............................................................................10-21
10.2.6.1 Connection diagram .......................................................................10-21
10.2.6.2 Board Arrangement ........................................................................10-21

Oki Data CONFIDENTIAL
1.
CONFIGURATION
1.1 System configuration ...................................................................1-2
1.2 Structure of MFP .........................................................................1-3
1.3 Offer of Options ...........................................................................1-4
1.4 Specifications ..............................................................................1-5
1.5 Interface specifications ..............................................................1-25

Oki Data CONFIDENTIAL
44871001TH Rev.6 1-2
1. CONFIGURATION
MHE (PCB)
MHD
(PCB) MFA-ASIC
DDR2-DRAM
(128MB)
SPI ROM
(Boot)
UART/SPI/GPIO
SPI
SSTL2
Modem
Local Bus
ARM9
USBD
USB HUB
IC
AFE IC MOTOR
DRV IC
RTC
NANDFLASH
(64MB)
(Program/FAXdata)
Clutch/Solenoid
Drive Circuit
USB
SDAA Amp
SPK
MCU
LCD
KEY LED
USB Memory
USB
Battery
CIS
(Contact Image Sensor)
MOTOR DRV IC
SPI
Digital
LED
Drive
Circuit
Enable
I/O Port
USB
HP
Sensor
CIS1
analog
CLK/SP
LED
16
FBS
3
FBM
4
ADFM
8
ADFS
8
SNSIF MOTIF
CL1
CL2
ADF
Motor
SOL
PM
CL1 CL2 SOL
2 2 2
SNS1
SNS3
SNS2
3 3
FB
Motor
USB
OPE
LINETEL
OPM
(PCB)
CN1
16
CN501
30
External
Telephone PSTN
Speaker
FFC White
Wire/ Black
Wire/ Black&Brown&Yellow &Orange
Wire/ Blue
Wire/ White
Wire/ White
4
Wire/White Wire/White
3
3 Wire/White
FFC/White
FPC
Wire/ Black
Wire/ Blue
Wire/ Gray
Wire/ Blue
16P 3P 4P 8P 8P
8P 8P 4P
2P2P2P
3P3P6P
30P
16P
Regist paper
Sensor
Reverse paper Sensor
Cover open/close Sensor
Document set Sensor
White 3
White 3 White 3
White 3
Blue 3
Photo Interrupter Photo Interrupter
Photo Interrupter Photo Interrupter
Black 2
Blue 2
Yellow 2
Blue 3
Black
Black
2P
Black
Red/ Ye llow/ Black
White/Black
2
3P
AC
Inlet
Purple 3 Red 9 Black 2 White 8 White 2
White
Black 2
8P
Cover Open-SW
28P
CN1
TR
CN2
High Voitage (Board-97H)
3P
3P
2
SB
CN3 DB CH FUSECUTRETURN
ID Unit
TAG
Toner Cartidge
White,Black
White/Black/ Red 3
Face up/down
SW
2P
3P
2P
3P
9P
4P 8P
2P
FACE
UP
PW
FAN1
HVIF
28P
IL
2NDTHERMDMPWSW
SP
16P
16P 3P
J4
J2
J1
J3
POWER
3P
3P
6P
3P
3P
3P
3P
3P
3P
3P
4P
2P
2P
2P
3P
3P 4P
10P10P
20P
20P
PW
FAN2
DFAN1
IN_WR
EXIT
PAP
TONER
HCLT
MCLT
RCLT
LCD
PNL
RCO
White
34
10 16
EXITM
Rear Cover
Photo Interrupter
EXIT
Motor
Wire/
White
FFC/
White
FFC02
White
LED HEAD
HEAD0
MFP
IF
SC
PW
LAN
USB1
WLPOW
WLAN
SDCARD
W-LAN
unit
USB
USB
USB
Cat5
Cat5
Cat5
Only MB471w
Only MB491
CU/PU Board
98M (PCB)
SU Board
except MB461
Regist
Clutch
MPT
Clutch
Hopping
Clutch
Toner SNS
(Board-97T)
CN
Paper Empty SNS
EXIT SNS
IN SNS
IWR SNS
Duct FAN
Power FAN
Power Unit
PWR
24/5V
PWR
3.3VS0 3
15
3
Power SW
(Board-P6A)
FUSER
FAN
FFC01
DC
Motor
Conn
ector
Thermister
POWER
GDIIF
FUSER
UNIT
Wire/Black
16P
1.1 System configuration
System Configurations of the MFP Unit.
The system configuration of this product is shown in
Figure 1-1
Figure 1-1

Oki Data CONFIDENTIAL
44871001TH Rev.6 1-3
1. CONFIGURATION
1.2 Structure of MFP
The insides of multi function 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.
Figure 1-2

Oki Data CONFIDENTIAL 1. CONFIGURATION
44871001TH Rev.6 1-4
1.3 Offer of Options
This product can be installed with the following option.
(1) Second Tray Unit

Oki Data CONFIDENTIAL 1. CONFIGURATION
44871001TH Rev.6 1-5
1.4 Specifications
Fundamental specifications
Category Item
EDT (Entry Desk Top)
model MB461/
ES4161 MFP
MB471/
MB471w
MB491/
ES4191 MFP/
MPS4200mb
MB441 MB451/
MB451w
Printer Engine
speed
A4/Letter,
simplex
29 ppm 33/35 ppm 40/42
ppm
Resolution Max.
resolution
2400 x
600dpi
600 x
600dpi
2400 x
600dpi
1200 x 1200dpi
Input tray 1st Tray 250 sheets (<80gsm)
2nd Tray N/A 530 sheets (<80gsm) Option
MP Tray Single
sheet
manual
feed slot
100
sheets
(<80gsm)
10
envelopes
Single
sheet
manual
feed slot
100 sheets (<80gsm)
10 envelopes
Auto Duplex Yes (Standard)
Toner Life
(ISO19752)
Starter 1K 2K
Standard 1.5K 4K/3K (OEL)
High-Yeild 2.5K 7K 7K/12K
Image Drum* Life:Continuous 36K,
3P/J 25K, 1P/J 14.5K
Life:Continuous 44K, 3P/J 30K,
1P/J 17.5K
RAM Standard 256M Bytes
Option N/A
Emulation Standard PCL6 PCL6 /
Post-
Script3
PCL6 PCL6 / PostScript3
Option N/A
Scanner Type Flat Bed + RADF
Resolution Max. 600 x 600dpi
Copy speed A4, 1to1,
High Speed
29cpm 33cpm 38cpm
Operation Panel LCD 320 x 128dot Graphic panel
w/ Back light
QWERTY N/A
*Image Drum for EDT model is included starter toner.
Category Item
MB441/
MB461/
ES4161 MFP
MB451/
MB471
MB451w/
MB471w
MB491/
ES4191 MFP/
MPS4200mb/
Interface USB2.0
Ethernet
Wireless
LAN N/A N/A N/A
Parallel N/A N/A N/A N/A
Facsimile N/A
USB
Memory
SD Memory Card N/A N/A N/A 4GBytes
Dimensions (mm) W x D x H 427 ｘ425 ｘ455
Weight (kg) 20
Power
con-
sumption
Power input 110-127VAC (Range 99-140VAC)
220-240VAC (Range 198-264VAC)
Sleep mode 3W
Power save mode 14W 18W 14W
Idle 80W
Typical operation 540W 580W 610W
Peak 950W
OFF mode 0.5W
Operating
en-
vironment
(tem-
perature)
During operation 10 °C to 32 °C,17 °C to 27 °C (Print quality assurance
temperature)
During non-operation 0°C - 43°C, Power OFF
During storage (Maximum
one year)
-10°C to 43°C, with drum and toners
During transportation
(Maximum one month)
-29°C to 50°C, with drum and toners

Oki Data CONFIDENTIAL
44871001TH Rev.6 1-6
1. CONFIGURATION
Category Item
MB441/
MB461/
ES4161 MFP
MB451/
MB471
MB451w/
MB471w
MB491/
ES4191 MFP/
MPS4200mb/
Operating
environ-
ment
(humidity)
During operation 20% - 80%, 50% - 70% (Print quality assurance
humidity), Maximum wet-bulb temperature 25°C
During non-operation 10% - 90%, Maximum wet-bulb temperature 26.8°C,
power OFF
During storage 10% - 90%, Maximum wet-bulb temperature 35°C
During transportation 10% - 90%, Maximum wet-bulb temperature 40°C
Others USB-IF logo Ye s
Windows logo Ye s
Operations on UPS Operations on UPS (uninterruptible power supply) are
not guaranteed.
Do not use UPS.

Oki Data CONFIDENTIAL
44871001TH Rev.6 1-7
1. CONFIGURATION
Category Item MB461+LP
MB491+/
MB491+LP/
MPS4700mb
Printer Engine
speed
A4/Letter,
simplex
45.5/47 ppm
Resolution Max.
resolution
2400 x
600dpi
1200 x
1200dpi
Input tray 1st Tray 250 sheets (<80gsm)
2nd Tray 530 sheets (<80gsm)
Option
MP Tray Single
sheet
manual
feed slot
100
sheets
(<80gsm)
10
envelopes
Auto Duplex Yes (Standard)
Toner Life
(ISO19752)
Starter 2K
Standard 4K
High-Yeild 7K 7K/12K
Image Drum* Life:Continuous 44K,
3P/J 30K, 1P/J 17.5K
RAM Standard 256M Bytes
Option N/A
Emulation Standard PCL6 PCL6 /
Post-
Script3
Option N/A
Scanner Type Flat Bed + RADF
Resolution Max. 600 x 600dpi
Copy speed A4, 1to1,
High Speed
33cpm 38cpm
Operation Panel LCD 320 x 128dot Graphic
panel
w/ Back light
QWERTY N/A
Category Item MB461+LP
MB491+/
MB491+LP/
MPS4700mb
Interface USB2.0
Ethernet
Wireless
LAN N/A
Parallel N/A
Facsimile N/A
USB
Memory
SD Memory Card
N/A
4GBytes
(Except
MB491+.)
Dimensions (mm) W x D x H 427 x 425 x 455
Weight (kg) 20
Power
con-
sumption
Power input 110-127VAC (Range 99-
140VAC)
220-240VAC (Range 198-
264VAC)
Sleep mode 3W
Power save mode 14W
Idle 80W
Typical operation 640W 660W
Peak 950W
OFF mode 0.5W
Operating
en-
vironment
(tem-
perature)
During operation 10 °C to 32 °C, 17 °C
to 27 °C (Print quality
assurance temperature)
During non-operation 0°C - 43°C, Power OFF
During storage (Maximum
one year)
-10°C to 43°C, with drum
and toners
During transportation
(Maximum one month)
-29°C to 50°C, with drum
and toners

Oki Data CONFIDENTIAL
44871001TH Rev.6 1-8
1. CONFIGURATION
Category Item MB461+LP
MB491+/
MB491+LP/
MPS4700mb
Operating
environ-
ment
(humidity)
During operation 20% - 80%, 50% - 70%
(Print quality assurance
humidity), Maximum wet-
bulb temperature 25°C
During non-operation 10% - 90%, Maximum
wet-bulb temperature
26.8°C, power OFF
During storage 10% - 90%, Maximum
wet-bulb temperature
35°C
During transportation 10% - 90%, Maximum
wet-bulb temperature
40°C
Others USB-IF logo Ye s
Windows logo Ye s
Operations on UPS Operations on UPS
(uninterruptible
power supply) are not
guaranteed.
Do not use UPS.

Oki Data CONFIDENTIAL
44871001TH Rev.6 1-9
1. CONFIGURATION
Printer section specifications
Category Item
MB461/
MB461+LP/
ES4161 MFP
MB471 MB471w
MB491/
MB491+/
MB491+LP/
ES4191 MFP/
MPS4200mb/
MPS4700mb
Print width Print width A4 horizontal
Engine
speed
A4/Letter, simplex 33/35ppm
*for MB461+LP
45.5/47ppm
40/42ppm
*for MB491+/
MB491+LP/
MPS4700mb
45.5/47ppm
Duplex 17ppm 20ppm
First print out
time (A4)
Standard Tray 5 sec 5 sec
Second Tray 6 sec 6 sec
Warm-up
time
From Power On Approx. 60sec
*1: Warm-up Time may change depending on a network
environment.
From Power save Approx. 25sec
Resolution LED head 600 dpi 1200 dpi
Max resolution
2400 x 600dpi 1200 x 1200dpi
Echono mode Toner save by low brightness
Life Printer life 200K prints or 5year
AMPV (Average Monthly
Print Volume)
3.3K/M
Image drum life Continuous 44K
3P/J 30K
1P/J 17.5K
Paper
handling
Feed paper capacity
(1st tray)
250 sheets of 80g/m2 (68Kg) plain paper, 25mm or less
in total thickness
Feed paper capacity
(manual feeder)
Single Sheet
manual feed slot
100 sheets (<80gsm)
10 envelopes
2nd Tray Option 530 sheets (<80gsm)
Paper unloading Face down:
Approx.150 sheets of 75g/m2 (65Kg) plain paper
Paper size 1st/2nd tray A4, A5, A6, B5, Letter, Legal 13, Legal 13.5, Legal 14,
Executive, 16K (184 x 260mm), 16K (195 x 270mm),
16K (197 x 273mm), Statement, Custom
* A6 and Custom cannot be used in tray 2.
Category Item
MB461/
MB461+LP/
ES4161 MFP
MB471 MB471w
MB491/
MB491+/
MB491+LP/
ES4191 MFP/
MPS4200mb/
MPS4700mb
Paper size Multi purpose tray A4, A5, A6, B5, Letter, Legal13, Legal13.5, Legal14, Executive,
Statement, 16K (184 x 260mm), 16K (195 x 270mm), 16K (197 x
273mm), Custom, COM-9 Envelope, COM-10 Envelope, Monarch
Envelope, DL Envelope, C5 Envelope, C6 Envelope
Duplex Legal 14", Letter, A4, Legal 13", Legal 13.5", Executive
and B5. (A5 is not supported due to short length)
Custom 86 x 140 ~ 216 x 1321
Minimum
paper size
Tray 1 4.1" x 5.8" (105 x 148mm : A6),
Tray 2 (option) 5.5" x 8.3" (148.5 x 210mm : A5)
MPT 3" × 5" (76.2mm x 127mm) Short Edge feed
Duplex 7.2" x 10.1" (182 x 257mm : B5)
Paper
thickness
Tray 1 16 to 32 lb (60 to 120g/m2)
Tray 2 (option) 16 to 32 lb (60 to 120g/m2)
MPT 16 to 43 lb (60 to 160g/m2)
Duplex 16 to 32 lb (60 to 120g/m2)
Status
switch/
sensor
Paper out Yes
Paper low None
Toner low Ye s
Cover open Ye s
Fuser temperature Ye s
Paper size None
Stacker full None
Font Bitmap type face LinePrinter
USPS
Scalable 1 type face Mono Type
Scalable 2 type face Mono Type
Scalable 3 type face Mono Type
Rasterizer Mono Type
Barcode 12 types computational
OCR. OCR-A, B

Oki Data CONFIDENTIAL
44871001TH Rev.6 1-10
1. CONFIGURATION
Network specications
Item Description
Connection Ethernet 10BaseT/100BaseTX automatic negotiation
Communication protocol TCP/IP V4, TCP/IP V6, LPR, Port9100, IPP, FTP, SMTP,
POP3, HTTP, HTTPS, Telnet, NetBIOS over TCP, SNMP
Trap, SNMPv1, SNMPv3, DHCP/BOOTP, DNS,DDNS,
WINS, SLP, UPnP, Bonjour, SNTP, ODNSP, SMB, CIFS,
Q-Server over IP, Q-Server over IPX, R-Printer, N-Printer,
NCP, PAP, NBP, LDAP, Kerberos, LLTD, WSD
Supported browser Microsoft Internet Explorer Ver. 6.0 or higher
Safari 2 or higher
Firefox 3 or higher
Required setup information,
configuration and others
IP address, sub net mask, gate way, SMTP/POP3 server,
FTP server, Web server
Output/Input switch Automatic
Item Description
Scanner type Flat bed scanner with automatic document feeder device (RADF)
Image processor/Controller MFA
Image sensor Color CIS
Light source LED
Optical resolution 300 x 300dpi, 300 x 600dpi, 600 x 600dpi
Output resolution 300 x 300dpi, 300 x 600dpi, 600 x 600dpi
Input level (A/D conversion) 48 bits (R,G, B, each 16 bits)
Output level 24 bits (R,G,B, each 8 bits) color, 8 bits grayscale, 4 bits
CMYK,.1 bit monochrome
Document size Flat bed 4.13 x 5.8~8.5 x 11.69in (105 x 148~215.9 x 296.9mm)
* for MB461+LP, MB491+LP and MPS4700mb
4.13 x 5.8~8.5 x 14in (105 x 148~215.9 x 355.6mm)
RADF Simplex : A6 - Legal14
Duplex : A5 - Legle14
Document
thickness
Flat bed 20mm
RADF Simplex /Duplex : 60g/m2 – 105g/m2
Reversing Auto
document feeder
(sheets)
RADF 50 sheets (80 g/m2)
Maximum
scanning range
Flat bed Maximum 215.9 x 296.9mm
* for MB461+LP, MB491+LP and MPS4700mb
215.9 x 355.6mm
RADF 4.13 x 5.8~8.5x 14in (105 x 148~215.9x355.6mm)
Scanning speed Color : Approx. 6 sec/page
(A4, 300 x 300dpi, Flatbed/ADF simplex)
Mono : Approx. 1.6 sec/page
(A4, 300 x 300dpi, Flatbed/ADF simplex)
(note) Data transfering time is not included
Warm-up time Less than 1 sec.
Life MTBF 5,000H
MTTR Less than 20 min.
Flat bed 5 years or 50,000 times of scan
RADF 5 years or 240,000 sheets (single-sided scan)
Scanner section specifications
Wireless specifications
Item Description
IEEE Standard IEEE802.11b/11g/11n
Mode Infrastructure mode
Security WEP(40/104bit), WPA(Enterprise/Personal),
WPA2(Enterprise/Personal)
Item Description
Attachment file format PDF (JPEG Compressed), M-TIFF (RAW/ G3/ G4
Compressed), JPEG (JFIF), XPS
Supported driver MB461/MB461+LP/ES4161 MFP:
TWAIN Scanner driver (USB, Network)
MB471/MB471w/MB491/MB491+/MB491+LP/ES4191 MFP/MPS4200mb/
MPS4700mb:
TWAIN Scanner driver (USB, Network), Fax Modem driver (Windows only)

Oki Data CONFIDENTIAL
44871001TH Rev.6 1-11
1. CONFIGURATION
Copy function
Categories Description
Copy Resolution Scan: 300x300dpi, 300x600dpi, 600x600dpi
Print: 600x600dpi
Document Size Flatbed A4, A5, A6, B5, Executive, Letter
* MB461+LP, MB491+LP , MPS4700mb can use
Legal13, Legal 13.5, Legal 14 in addition to above sizes.
RADF A4, A5, A6, B5, Executive, Letter, Legal13, Legal13.5,
Legal14
*A6 Duplex Scan not supported
Number of Copies 1 ~ 99
Collate(Sort) ON/OFF
Zoom
(Auto is
spported)
Custom 25 ~ 400%, to scale by 1%.
Preset 70% (A4→A5)
78% (Leg14→Let)
81% (Leg13.5→Let)
84% (Leg13→Let)
86% (A4→B5)
94% (A4→Let)
97% (Let→A4)
98% (Fit to page)
100%
Auto (Document Size and Tray are specied)
115% (B5→A4)
141% (A5→A4)
Edge Erase Set ON, OFF
Erase Width 2~50mm (increments of 1mm)
0.1~2.0 inch (increments of 0.1 inch)
Margin shift Front Left/Top: 0 ~ ±25 mm (0.0~±1.0 inch) (1mm/Step)
Back Left/Top: 0 ~ ±25 mm (0.0~±1.0 inch) (1mm/Step)
N-up Document pages OFF, 2-in-1, 4-in-1 Vertical, 4-in-1 Horizontal
ID Card Copy [ID Card Copy] OFF, ON
Repeat Copy OFF, 2 times, 4 times
Poster Copy N/A
Document Direction Portrait, Landscape
Categories Description
Duplex Copy Method OFF,
1 sided→2 sided Long Edge
1 sided→2 sided Short Edge
2 sided→2 sided
2 sided Long Edge→1 sided
2 sided Short Edge→1 sided
Binding Position Long Edge, Short Edge
* This can be set when the N-up or Repeat setting.
Mixed Size OFF, ON
The only available size combinations are Letter + Legal
13.5 and Letter + Legal14.
Job build scanning OFF, ON
Banner Copy N/A
Copy image quality adjustment Background Removal, Density, Contrast

Oki Data CONFIDENTIAL
44871001TH Rev.6 1-12
1. CONFIGURATION
Item Setting Description
Document type Text / Photo,
Text,
Photo,
Photo (Glossy)
Allows the user to select the type of images on
the document and optimizes the image quality
for the image to be scanned according to the
selected type.
With "Background Removal/Show-through
Cancellation” selected, their levels can be
adjusted.
Resolution Nomal,
High Quality,
High Speed
Background
Remove
OFF, 1 ~ 3~ 6 Blocks out the color background of the image
(assuming document has a color background)
so that the background color is not printed.
Density -3 (Light) ~ 0 ~ + 3 (Dark) Adjusts the darkness of images.
Contrast -3 (Low) ~ 0 ~ +3 (High) Adjusts the difference between the light and
dark areas of an image.
Copy Image Adjustments
Items Setting Description
Document Type Text, Text/Photo,
Photo, Photo
(Glossy)
Allows the user to select the type of
images on the document and optimizes
the image quality for the image to be
scanned according to the selected type.
Background Removal OFF, 1, 2, 3, 4, 5, 6 Blocks out the color background of the
image (assuming document has a color
background) so that the background color
would not be printed.
Density -3, -2, -1, 0, +1, +2,
+3
Adjusts the darkness of images.
Resolution Color 75, 100, 150, 200,
300, 400, 600dpi
(400/600 can be set
only for FB)
The resolution in which a document is
scanned is selected *1
Mono (Grayscale) 75, 100, 150, 200,
300, 400, 600dpi
Mono (2 levels) 75, 100, 150, 200,
300, 400, 600dpi
Scan size (Document Size) A4, Letter, Legal14,
Legal13, Legal13.5,
Executive, A6*2, A5,
B5
Default Size is browsed, and if it is A4,
AB-based sizes are placed higher in the
operator panel display and if it is Letter,
Letter-based sizes are.
Duplex Scan OFF, Long Edge
Binding, Short Edge
Binding
Scans the images on front and back sides
by launching Scan once.
Job Build Scanning ON, OFF Allows constructing a single scan job
from multiple individual images on the
documents.
Edge
Erase
Settings ON, OFF Allows blocking out the peripheral area of
the document (erasing the areas where
spurious shadows and borders may
occur).
Width 5 ~ 50mm (in 1mm)
0.2 ~ 2.0 inch (In 0.1
inch)
[Not supported if Scan jobs are from PC
via TWAIN]
ScanTo Common Specification

Oki Data CONFIDENTIAL
44871001TH Rev.6 1-13
1. CONFIGURATION
Items Setting Description
Contrast -3, -2, -1, 0, +1, +2,
+3
Adjusts the difference between the light
and dark areas of an image.
Saturation Adjustment (In Color
mode only)
-3, -2, -1, 0, +1, +2,
+3
Adjusts the saturation of an image.
Hue Adjustment (In Color mode
only)
-3, -2, -1, 0, +1, +2,
+3
Adjusts the balance between Red and
Green with Yellow in the middle.
RGB Adjustment (In Color
mode only)
-3, -2, -1, 0, +1, +2,
+3
Enables individual RGB adjustments
Grayscale ON, OFF
File format Color PDF, TIFF, JPEG,
XPS
File format used to save the scanned
images as a file
Encrypt PDF is a new function to support.
Mono (Grayscale) PDF, TIFF, JPEG,
XPS
Mono (2 levels) PDF, TIFF, XPS
Encrypt, Not Encrypt With Encrypted PDF set to ON, Setup
Wizard launches enabling to set each
menu item.
Encrypted
PDF
(PDF
document
security)
[New
function]
Encryption level Low (Compatible with
Acrobat4.0 and later)
Medium (Compatible
with Acrobat5.0 and
later)
High (Compatible with
Acrobat7.0 and later)
Specifies the level of encryption. The
higher the level, the higher the security.
Encrypted by RC4 (40bit) for Low, RC4
(128bit) for Medium, and AES (128bit) for
High.
Default value is Medium.
Password to open
a document
Not set
Set
Default password set
Sets a password to open created PDF
documents.
Setting from Admin Setting:
* Either "Password to open a document"
or "Access password" must be set. ("Not
set" may not be selected for both.)
Items Setting Description
Set Password /
Re-enter Password
Default value is
NULL
Sets a password to open created PDF
document.
NULL by default.
Characters that can be entered are 1 to 32
alphanumeric characters (Upper-/Lower-
case letters) and no symbols can be used.
This cannot be the same as Access
password.
* Users are prompted to enter twice for
confirmation.
Access Password Not set
Set
Default password set
Sets a password to restrict operations
such as editing and printing created PDF
documents.
* Either "Password to open a document"
or "Access password" must be set. ("Not
set" may not be selected for both.)
Set Password /
Re-enter Password
Default value is
NULL
Sets a password to restrict operations
such as editing and printing created PDF
documents.
NULL by default.
Characters that can be entered are 1 to 32
alphanumeric characters (Upper-/Lower-
case letters) and no symbols can be used.
This cannot be the same as Access
password.
* Users are prompted to enter twice for
confirmation.
Docum-
ent
Access
Print
the
Docu-
ment
Not allowed
Low resolution
(150dpi)
High resolution
Low Resolution (150dpi) is displayed only
when Encryption Level is other than Low.
Extract
Text
and
Graph-
ics
Not allowed Security Options in formatting in PDF:
Extracting texts and graphics
Allowed