Oki B930 Series User manual

B930
Maintenance Manual
Revision 1
The information contained in this manual is the property of Oki Printing
Solutions and is to be used solely in conjunction with servicing of said product.

B930
Laser Printer
Base Engine Service Manual
FI01001A1

TOC-1
Contents
Chapter 1 Introduction.................................................................................................... 1-1
Conventions...............................................................................................................................................1-1
Safety ........................................................................................................................................................1-1
Laser Beams.......................................................................................................................................1-1
Chapter 2 Principles of Operation................................................................................. 2-1
Engine .......................................................................................................................................................2-1
Summary of Print Process ..................................................................................................................2-1
Driving Force Transmission Path........................................................................................................2-4
Main Motor....................................................................................................................................2-4
Drum Motor...................................................................................................................................2-5
Paper Transport..................................................................................................................................2-5
Paper Transport Path ...................................................................................................................2-5
Layout of Paper Transport Path ...................................................................................................2-6
Functions of Main Components ..........................................................................................................2-7
Paper Cassette.............................................................................................................................2-7
Paper Feeder................................................................................................................................2-8
MPF..............................................................................................................................................2-9
Xero............................................................................................................................................2-11
Fuser ..........................................................................................................................................2-13
Exit..............................................................................................................................................2-14
Drive..................................................................................................................................................2-15
Electrical Components and Controller........................................................................................2-16
Control...............................................................................................................................................2-17
Paper Size Control .....................................................................................................................2-17
ROS Control ...............................................................................................................................2-18
Fuser Control..............................................................................................................................2-18
Schematic Diagram of Safety System........................................................................................2-19
1000 Sheet Feeder..................................................................................................................................2-19
Driving Force Transmission Path......................................................................................................2-19
Main Motor..................................................................................................................................2-19
Paper Transport................................................................................................................................2-20
Paper Transport Path .................................................................................................................2-20
Layout of Paper Transport Path .................................................................................................2-21
Paper Transport................................................................................................................................2-22
Paper Transport Path .................................................................................................................2-22
Layout of Paper Transport Path .................................................................................................2-23
Functions of Main Components ........................................................................................................2-24
Paper Cassette...........................................................................................................................2-24
Paper Feeder..............................................................................................................................2-25
Main Components ......................................................................................................................2-27
Control...............................................................................................................................................2-28
Paper Size Control .....................................................................................................................2-28
Exit 2........................................................................................................................................................2-29
Driving Force Transmission Path......................................................................................................2-29
Motor Assy Exit 2........................................................................................................................2-29
Motor Assy-offset........................................................................................................................2-29
Paper Transport................................................................................................................................2-30
Paper Transport Path .................................................................................................................2-30
Layout of Paper Transport Path .................................................................................................2-30
Functions of Main Components ........................................................................................................2-31

TOC-2
HCF......................................................................................................................................................... 2-33
Overview .......................................................................................................................................... 2-33
Configuration.............................................................................................................................. 2-33
Main Functions........................................................................................................................... 2-34
Paper Capacity .......................................................................................................................... 2-34
Paper Size ................................................................................................................................. 2-34
Feedable Paper Weight............................................................................................................. 2-34
Paper Feeding................................................................................................................................. 2-34
Outline........................................................................................................................................ 2-34
Feeder Block Operation............................................................................................................. 2-36
Transport Block Operation......................................................................................................... 2-37
M/C Status Monitoring...................................................................................................................... 2-38
Static Paper Jam Detection ....................................................................................................... 2-38
Interlock Detection ..................................................................................................................... 2-39
Tray Insertion Detection............................................................................................................. 2-39
Paper Size Detection........................................................................................................................ 2-40
Tray Lifting........................................................................................................................................ 2-41
No-Paper Detection.......................................................................................................................... 2-42
Remaining Paper Volume Detection................................................................................................2-42
Tandem Tray........................................................................................................................................... 2-43
Driving Force Transmission Path ..................................................................................................... 2-43
Main Motor................................................................................................................................. 2-43
Paper Transport ............................................................................................................................... 2-44
Paper Transport Path................................................................................................................. 2-44
Layout of Paper Transport Path.................................................................................................2-45
Functions of Main Components........................................................................................................ 2-46
Paper Cassette.......................................................................................................................... 2-46
Paper Feeder............................................................................................................................. 2-48
Main Components...................................................................................................................... 2-49
Paper Size Control..................................................................................................................... 2-50
Duplex..................................................................................................................................................... 2-51
Driving Force Transmission Path ..................................................................................................... 2-51
MOTOR ASSY DUP ..................................................................................................................2-51
Paper Transport ............................................................................................................................... 2-51
Paper Transport Path................................................................................................................. 2-51
Layout of Paper Transport Path ....................................................................................................... 2-52
Functions of Main Components........................................................................................................ 2-53
Finisher................................................................................................................................................... 2-54
Overview .......................................................................................................................................... 2-54
Configuration.............................................................................................................................. 2-54
Paper Size and Weight.............................................................................................................. 2-55
Functions and Applicable Trays.................................................................................................2-56
Paper Transfer ................................................................................................................................. 2-56
H-TRA........................................................................................................................................ 2-59
From H-TRA to Puncher ............................................................................................................ 2-59
From Puncher to Compile Tray.................................................................................................. 2-60
From Compile Tray to Stacker Tray........................................................................................... 2-62
From Puncher to Top Tray......................................................................................................... 2-62
Functions of Sensors along the Paper Path .............................................................................. 2-63
Puncher................................................................................................................................................... 2-64
Adjusting Punching Positions........................................................................................................... 2-65
Punching .......................................................................................................................................... 2-65
Detecting Punch Dust Full................................................................................................................ 2-66
Detecting Punch Dust Box ............................................................................................................... 2-66
Functions of Puncher Sensors/Motors .............................................................................................2-66

TOC-3
Compile Tray...........................................................................................................................................2-68
Outline of Operation..........................................................................................................................2-68
Capacity of Compile Tray..................................................................................................................2-68
Compile Tray Operation with Multiple Paper Sizes...........................................................................2-69
Tamping............................................................................................................................................2-69
Front Tamping...................................................................................................................................2-69
Rear Tamping.............................................................................................................................2-70
Center Tamping..........................................................................................................................2-70
Determining Tamper Home Position ..........................................................................................2-71
Tamping......................................................................................................................................2-71
Offsetting...........................................................................................................................................2-71
Functions of Compile Tray Sensors/Motors......................................................................................2-72
Stapler.....................................................................................................................................................2-72
Stapling Operation ............................................................................................................................2-72
Staple Positions ................................................................................................................................2-72
Paper Sizes That Allow Stapling.......................................................................................................2-73
Stapler Head.....................................................................................................................................2-75
Functions of Stapler Sensors/Motors................................................................................................2-76
Operation ..........................................................................................................................................2-77
Functions of Top Tray Sensors.........................................................................................................2-77
Stacker Tray......................................................................................................................................2-77
Operation ..........................................................................................................................................2-77
Full Stack Detection..........................................................................................................................2-79
Functions of Stacker Tray Sensors/Motors.......................................................................................2-80
Power Supply and Interlock.....................................................................................................................2-81
Chapter 3Wiring ............................................................................................................ 4-1

TOC-4
General Wiring Diagram ........................................................................................................................... 4-1
Engine....................................................................................................................................................... 4-2
Wiring Diagram between Parts........................................................................................................... 4-3
Configuration................................................................................................................................ 4-3
Notes on Using the Wiring Diagram between Parts..................................................................... 4-4
1 Power supply................................................................................................................................... 4-6
2 Fuser............................................................................................................................................... 4-7
3 Paper Feed...................................................................................................................................... 4-8
4 Xero / Deve ..................................................................................................................................... 4-9
5 Drive / CRUM ................................................................................................................................ 4-11
6 Tray1 ............................................................................................................................................. 4-13
7 Tray2 ............................................................................................................................................. 4-14
8 MPF............................................................................................................................................... 4-16
9 ROS............................................................................................................................................... 4-19
10 Exit .............................................................................................................................................. 4-19
11 Controller..................................................................................................................................... 4-21
1000 Sheet Feeder................................................................................................................................. 4-22
General Wiring Diagram................................................................................................................... 4-22
Wiring Diagram between Parts......................................................................................................... 4-22
Configuration.............................................................................................................................. 4-22
Notes on Using the Wiring Diagram between Parts................................................................... 4-23
1 Drive.............................................................................................................................................. 4-24
2 Tray3 ............................................................................................................................................. 4-26
3 Tray4 ............................................................................................................................................. 4-28
Duplex..................................................................................................................................................... 4-30
General Wiring Diagram................................................................................................................... 4-30
Wiring Diagram between Parts......................................................................................................... 4-32
Configuration.............................................................................................................................. 4-32
Notes on Using the Wiring Diagram between Parts................................................................... 4-32
1 Duplex ........................................................................................................................................... 4-33
Exit.......................................................................................................................................................... 4-35
General Wiring Diagram................................................................................................................... 4-35
Wiring Diagram between Parts......................................................................................................... 4-36
Configuration.............................................................................................................................. 4-36
Notes on Using the Wiring Diagram between Parts................................................................... 4-37
1 Motor / Solenoid ............................................................................................................................ 4-38
2 Sensor / Fan.................................................................................................................................. 4-39
Finisher................................................................................................................................................... 4-41
General Wiring Diagram................................................................................................................... 4-41
Configuration.............................................................................................................................. 4-42
Notes on Using the Wiring Diagram between Parts................................................................... 4-44
1 Power Supply ................................................................................................................................ 4-46
2 H-Transport ................................................................................................................................... 4-47
3 Sensor (Paper feed section).......................................................................................................... 4-48
4 Sensor (Exit section) ..................................................................................................................... 4-50
5 Motor............................................................................................................................................. 4-51
6 Motor / Clutch / Solenoid............................................................................................................... 4-52
7 Tamper.......................................................................................................................................... 4-54
8 Stapler........................................................................................................................................... 4-55
9 Puncher1....................................................................................................................................... 4-56
10 Puncher2..................................................................................................................................... 4-57
HCF......................................................................................................................................................... 4-59
General Wiring Diagram ......................................................................................................................... 4-59
Wiring Diagram between Parts......................................................................................................... 4-60
Configuration.............................................................................................................................. 4-60

TOC-5
Notes on Using the Wiring Diagram between Parts...................................................................4-61
1 Switch.............................................................................................................................................4-62
2 Sensor............................................................................................................................................4-63
3 Sensor/Motor/Solenoid...................................................................................................................4-65
Tandem Tray...........................................................................................................................................4-67
General Wiring Diagram....................................................................................................................4-67
Wiring Diagram between Parts .........................................................................................................4-68
Configuration ..............................................................................................................................4-68
Notes on Using the Wiring Diagram between Parts...................................................................4-69
1 Drive...............................................................................................................................................4-70
2 Tray3..............................................................................................................................................4-72
3 Tray4..............................................................................................................................................4-74
Chapter 4Plug/Jack........................................................................................................ 5-1
Engine .......................................................................................................................................................5-1
Connector [P (plug) / J (jack)] .............................................................................................................5-1
List of P/J......................................................................................................................................5-1
P/J layout diagram........................................................................................................................5-3
1000 Sheet Feeder..................................................................................................................................5-13
Connector [P (plug) / J (jack)] ...........................................................................................................5-13
List of P/J....................................................................................................................................5-14
P/J layout diagram......................................................................................................................5-14
Duplex .....................................................................................................................................................5-16
Connector [P (plug) / J (jack)] ...........................................................................................................5-16
List of P/J....................................................................................................................................5-17
Exit 2........................................................................................................................................................5-18
Connector [P (plug) / J (jack)] ...........................................................................................................5-18
List of P/J....................................................................................................................................5-18
Finisher....................................................................................................................................................5-20
Connector [P (plug) / J (jack)] ...........................................................................................................5-20
List of P/J....................................................................................................................................5-20
P/J layout diagram......................................................................................................................5-22
HCF.........................................................................................................................................................5-29
Connector [P (plug) / J (jack)] ...........................................................................................................5-29
List of P/J....................................................................................................................................5-29
Tandem Tray...........................................................................................................................................5-32
Connector [P (plug) / J (jack)] ...........................................................................................................5-32
List of P/J....................................................................................................................................5-32
P/J layout diagram......................................................................................................................5-34

Chapter 1 Introduction
This manual is a standard service manual containing information required for maintenance of this
laser printer (standard specifications).
This manual is intended for use by OEMs when they provide maintenance services for this laser
printer or when they prepare maintenance data. It is prohibited to use this manual for other pur-
poses.
This document is protected by copyright. It is illegal to photocopy or duplicate any part of this
document in any form without previous permission in writing.
Additional information about this printer, such as specifications, can be found in other supplied
documents.
Conventions
The term “MSI” should be translated to “MPF” (Multi Purpose Feeder) in any text or illus-
tration.
Tray numbering for all text and illustrations should be read in the in the following manner:
Maintenance operations requiring special cautions or additional information to descriptions of
this manual are presented as “Warning”, “Caution”, or “Note”, according to their nature.
If instructions are not observed, death or serious injury may be caused.
If instructions are not observed, injuries of workers or physical damages to assets
(including this laser printer) may result.
NOTE Particularly important essentials for procedures, steps, rules, and other conditions.
Reference Incidental information to descriptions.
Safety
To prevent possible accidents during maintenance operation, you should strictly observe the
“Warning” and “Caution” information in this manual.
Performing dangerous operations and procedures out of range of this manual should be avoided.
Printed
Tray # TG Tray #
12
23
34
45
5 1(MSI/MPF)
66(HCF)
MSI/MPF 1
HCF 6

1-2
Occasionally procedures not covered by this manual may be required in actual operation, which
Laser Beams
This laser printer has a switch (INTERLOCK S/W 5V) which removes power to the laser beam
output circuit, preventing operation of the laser beam output unit (ROS ASSY-12). The switch
automatically removes power when the CRU is removed.
Do not turn the switch ON except for normal operation to prevent laser emissions during mainte-
nance.
•If your eyes are exposed to laser beams, you may lose your eyesight.
•Never open any cover if warning label for laser beams is attached there.
•Before disassembling and reassembling this laser printer, be sure to turn it OFF.
•When servicing this laser printer while it is running, be sure to follow the
procedures specified in this manual.
•You should understand the laser beam is capable of causing injury to the human
body, including anyone in the general area.
NOTE Laser beams have the following characteristics:
•Frequencies are smaller in width than other beams (sun and electric bulbs) and
phases are uniform so that high monochromatic and convergence performance
can be obtained and thin beams of light can reach places at a long distance.
•Due to the high convergence, beams are concentrated in high density and high
temperature, which is dangerous to human body.
Reference: Laser beams of this laser printer are invisible rays which you cannot see.
ROS ASSY-12 Caution label

Chapter 2 Principles of Operation
Engine
Summary of Print Process
Electrophotography is used in the FIO printer to print image on paper using a video signal sent
from the PWBA ESS to the PWBA MCU F. The electrophotography is composed of the following
7 steps.
1. Charging
Negative charges are uniformly distributed over the drum surface by the Bias Charge Roll.
2. Exposure
The laser scanner scans the drum surface with a laser beam modulated with the signal from
the PWBA ESS (controller), to create an invisible electrostatic latent image on the drum sur-
face.
3. Development
During development, toner particles are attracted to the electrostatic latent image on the
drum surface, forming a visible toner image.
4. Transfer
The toner image is transferred from the drum surface to the paper.
5. Detack
Electric charges on the paper are partially neutralized. As a result, the paper is stripped off
the drum surface.
6. Fusing
The toner image is permanently fixed to the paper by heat and pressure.
7. Cleaning
The remaining toner is removed from the drum surface.
• Summary of print process
By rotating the drum, the drum surface undergoes various steps including charging, exposure,
development, transfer, detack, and cleaning. A toner image is created on the drum surface and
transferred to the paper. The paper is subject to the transfer, detack, and fusing steps by the
paper transport mechanism. When the paper is positioned relative to the image, the toner image
is transferred to the paper from the drum surface, and then fused.
Main components directly associated with the print process and paper transport are illustrated in
the following figures.
• Components associated with print process
FI61001A1
1. Charging 3. Development 4. Transfer
Paper Feeding
5. Detack 6. Fusing Print out 2. Exposure
: Flow of paper
: Transfer process
7. Cleaning
Next print cycle