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

• Components associated with paper transportation
FI61002A1
FUSER ASSY
CRU
1. Charging
3. Development
4. Transfer
5. Detack
6. Fusing
2. Exposure
7. Cleaning

2-3
In the exposure step, the negatively charged drum surface is scanned by a laser beam. The laser
diode of the ROS (Raster Output Scanner) passes through a rotating polygon mirror (6 facets)
and lens scanning the drum from one end to the other.
The radiation of the laser beam varies according to a video signal from the PWBA ESS.
The laser beam shot at the drum excites electrons directed to the photo conductor. As a result,
electron-hole pairs are induced in the photoconductive layer. Since electrons are moved toward
the body inside the drum by the electric field, the electron-hole pairs move to the surface of the
photoconductive layer. Negative charges in the portion decrease, thus creating an invisible elec-
trostatic latent image there.
Toner particles are adsorbed onto this electrostatic latent image in the next step. Thus, the image
is developed. The toner particles adsorbed to the drum are attracted to positive charges supplied
by the BTR, and are transferred to the paper. The drum is sent for detack and cleaning steps.
• Electrostatic latent image formed on drum
FUSER ASSY
OPTION EXIT2
OPTION DUPLEX
MSI
HSG ASSY-BTR CRU
DRUM
OPTION
TRAY MODULE
FI61003A1
TRAY 1
TRAY 2
TRAY 3
TRAY 4

2-4
In the cleaning step, the remaining toner is removed from the drum surface. The drum surface is
prepared for the next cycle.
The toner is scraped off the drum surface by a cleaning blade.
NOTE The toner scraped off in the cleaning step is collected in a recovery toner compartment
partitioned from unused toner. The transfer rate is normally more than 90%, but varies
depending on the image coverage range and environmental conditions such as tem-
perature and humidity. The used toner cannot be reused.
NOTE When the printing step is started, the whole drum surface is scanned with a laser
beam. If charges generated in the previous step remain on the drum surface, they are
completely removed. At the beginning and end of the continuous printing step, a nega-
tive high voltage is applied to the BTR. If toner particles adhere to the BTR in the previ-
ous printing step, the toner particles are returned to the drum surface. In this way, the
surface of the BTR is cleaned.
Driving Force Transmission Path
Main Motor
The rotating force of the MAIN MOTOR is transmitted through the GEAR and the PULLEY 25T to
components that need mechanical driving force as shown in the following flow.
FI61004A1
Laser beam
Electrons Detack
Photoconductor
Conductor Electron-hole pairs
Electrostatic latent image
Laser beam
Decrease in
negative charges

2-5
The driving force transmitted to the GEAR drives the ROLLER ASSY-TA, ROLLER ASSY-FEED,
ROLLER ASSY REGI, FUSER ASSY, and ROLL ASSY OCT through the clutch and gears.
The driving force transmitted to the PULLEY 25T drives the EXIT1 (ROLL ASSY-OCT) through
the gears.
The driving force transmitted to the FUSER ASSY drives the Heat Roll.
Drum Motor
The rotating force of the DRUM MOTOR is transmitted through the gears to components that
need mechanical driving force as shown in the following flow.
The driving force transmitted to the CRU drives the DRUM. The driving force is then transmitted
to the BTR by direct contact with the DRUM.
Paper Transport
Paper Transport Path
Paper is supplied from the MPF, Tray1 or Tray2, and is transported to the printer along the paper
transport path shown below.
MAIN MOTOR
GEAR
CLUTCH ASSY-TA
BRKTASSY TA
GEAR-18T
ROLLER ASSY-FEED
ROLLER ASSY REGI FUSER ASSY ROLLASSY OCT
ROLLER ASSY-TA
PULLEY 25T
GEAR-EXIT
GEAR-19T
FI61006A1
DRUM MOTOR
DRUM
HSG ASSY-BTR
MAG ROLL

2-6
Layout of Paper Transport Path
The following is a cross section of the FIO laser printer, showing main components directly asso-
ciated with the paper path and transport.
• Main components associated with transport of paper
FI61007A2
ROLLER ASSYROLLER ASSY
PRINT EXIT
ROLLER ASSY REGI
ROLLER ASSY-FEED
MSI
ROLLASSY-DRIVE
ROLLER ASSY
TRAY 1
ROLLER ASSY
ROLLASSY OCT
ROLLER DUPA3L
ROLLASSY-INV
ROLLASSY OCT
HSG ASSY-BTR
ROLLER ASSY
FEEDER ASSYFEEDER ASSYMSI ASSY
ROLLER ASSY-TA
TRAY 2
ROLLER ASSY
Option
EXIT2
EXIT1
FUSER ASSY
CRU
Option DUPLEX
DRUM
HEAT ROLL
PRESSURE ROLL
RLR-PINCH EXIT
ROLLER ASSY DUP

2-7
Functions of Main Components
This chapter describes the functions of the main components of the FIO laser printer.
4.1 Paper Cassette
4.2 Paper Feeder
4.3 MPF
4.4 Xero
4.5 Fuser
4.6 Drive
4.7 Electrical Components and Rollers
Paper Cassette
It is necessary to adjust the FRONT SIDE GUIDE ASSY, REAR SIDE GUIDE and END GUIDE
of the Paper Cassette to match the paper size.
FRONT SIDE GUIDE ASSY and REAR SIDE GUIDE
The FRONT SIDE GUIDE ASSY can be adjusted to different paper sizes by moving it to the
front or rear. These guides come into contact with the front and rear edges of the paper and
hold it in position.
The REAR SIDE GUIDE moves together with the FRONT SIDE GUIDE ASSY.
END GUIDE
The Paper Cassette is so designed that it can adapt to the paper length in the paper feed
direction by moving the END GUIDE to the left or right.
BOTTOM PLATE
HEAT ROLL
ROLLASSY-OCT
ROLLASSY-OCT
OPTION EXIT2
OPTION DUPLEX
MSI
HSG ASSY-BTR
ROLLER
DUPA3L
ROLLER
PINCH DUP DRUM
FI61009A2
TRAY 1
TRAY 2
ROLLER PINCH EXIT
ROLLASSY-INV
RLR-PINCH EXIT
ROLLER
ASSY-DUP
ROLLER
ASSY-FEED
ROLLER
ASSY-PINCH
ROLL
ASSY-DRIVE
ROLLER-TA PINCH
ROLLER ASSY-TA
ROLLER ASSY
ROLLER ASSY
ROLLER
DUPA3L
PRESSURE ROLL
ROLLASSY-REGI
ROLLER ASSY
ROLLASSY-REGI-P

2-8
The force pushing up the BOTTOM PLATE is transmitted by the driving force of the MOTOR
on the FEEDER ASSEMBLY to the LIFT UP SHAFT through the GEAR (13T/60T) and SEC-
TOR GEAR (60T). The BOTTOM PLATE is pushed up by the rotation of the LIFT UP
SHAFT, which causes the supplied paper to get in contact with the ROLLER ASSY
(NUDGER).
• Paper Cassette
Detection of paper size
The paper size to which the cassette is set is transmitted to the switches S/W1 to S/W5 on
the SWITCH ASSY P S by moving these guides. The paper size is detected by the ON/OFF
information of these switches.
Paper sizes that can be automatically detected are as 5.1 Paper Size Control
Paper Feeder
Since the Tray1 and Tray2 are functionally equivalent in terms of the SWITCH ASSY P S, NO
PAPER SENSOR, LEVEL SENSOR and PRE FEED SENSOR, only the components of one tray
are described here.
The Paper Feeder is a mechanical unit for supplying paper from the Paper Cassette to the
printer. The driving force from the TRAY 1/2 FEED LIFT UP MOTOR on the FEEDER ASSY is
transmitted to the three ROLLER ASSY to feed paper.
When the ROLLER ASSY (NUDGER) picks up some sheets of paper and the remaining paper
decreases, the ACTUATOR of the LEVEL SENSOR lowers accordingly. When the LEVEL SEN-
SOR detects the lowering, the TRAY 1/2 FEED LIFT UP MOTOR is activated to lift the LIFT UP
SHAFT and the BOTTOM PLATE is also lifted accordingly. Thus, the remaining paper is ready to
be fed out.
TRAY 1/2 FEED LIFT UP MOTOR
This motor is activated to feed paper and to lift the BOTTOM PLATE. When feeding paper, it
rotates forward to drive the ROLLER ASSY (NUDGER). When lifting the BOTTOM PLATE, it
rotates reversely to drive the tray module gears to lift the LIFT UP SHAFT.
SWITCH ASSY P S
This SWITCH ASSY P S switches for setting the size of paper supplied from each Paper
Cassette. A signal indicating the set size is transmitted as a voltage to the PWBA MCU F.
NO PAPER SENSOR
If paper runs out in a Paper Cassette, the ACTUATOR lowers and the flag of the ACTUA-
TOR that has stayed in the NO PAPER SENSOR sensing area leaves there. Thus, the light
END GUIDE
FRONT SIDE GUIDE ASSY
BOTTOM PLATE
REAR SIDE GUIDE

2-9
of the sensor is transmitted. When the sensing area is blocked (paper is present), the signal
becomes OFF.
LEVEL SENSOR
This sensor detects, by the ACTUATOR position, whether paper in the Paper Cassette is
lifted. When the flag of the ACTUATOR leaves the LEVEL SENSOR sensing area, the sen-
sor detects that the paper has been lifted.
PRE FEED SENSOR
This sensor detects a paper jam in the Paper Cassette by the paper position and sensor ON/
OFF time.
The sensor ON/OFF states can be monitored by paper passing through the PRE FEED
SENSOR sensing area.
MPF
The MPF is a mechanical unit to feed manually supplied paper to the printer. The driving force
from the MAIN MOTOR of the MAIN ASSY 242 is transmitted to the ROLLER ASSY-FEED to
feed paper.
ROLLER ASSY-FEED
The ROLLER ASSY-FEED feeds paper set on the MPF.
ROLLER ASSY-DRIVE
SENSOR
(LEVEL SENSOR)
SENSOR
(NO PAPER SENSOR)
SENSOR
(PRE FEED SENSOR)
FEEDER ASSEMBLY
TRAY 1/2 FEED LIFT UP MOTOR
SWITCH ASSY P S
TRAYASSY
FRONT

2-10
The ROLLER ASSY-DRIVE feeds paper into the printer.
SOLENOID PICK UP
The SOLENOID PICK UP transmits the driving force from the MAIN MOTOR to the ROLLER
ASSY-FEED.
SENSOR-PHOTO IN
The SENSOR-PHOTO IN detects whether paper is present on the MPF.
SENSOR ASSY-MPF
The SENSOR ASSY-MPF detects the width (length in the main scanning direction) of paper
on the MPF.
Detecting paper size
The size of paper on the MPF is transmitted to the SENSOR ASSY-MPF by moving the MPF
paper guide, and is determined by the PWBA MCU F.
Paper sizes that can be automatically detected are as follows:
Paper size Width (mm) Feed length (mm)
Side-Guide Stopper
(min.) 84 -
Paper detection area
(min.) 88.2 -
3.5” x 8.5”SEF 88.9 215.9
Post Card SEF 101.6 152.4
5.5” x 8.5” SEF 139.7 215.9
Postcard LEF 148 100
A6 LEF 148 105
A5 SEF 148 210
Post Card LEF 152.4 101.6
B6 LEF 182 128.5
B5 SEF 182 257
Monarch LEF 190.5 98.4
A5 LEF 210 148
A4 SEF 210 297
5.5” x 8.5” LEF 215.9 139.7
5.5” x 11” SEF (Letter) 215.9 279.4
SENSOR-PHOTO IN
SENSOR ASSY-MSI
ROLLER ASSY-DRIVE
ROLLASSY-FEED
SOLENOID PICK UP
LEFT

2-11
Xero
CRUThe CRU is made up of the following main six components.
•Drum
The Drum is composed of a photoconductive surface layer (an insulator in the dark but
becomes conductor when receiving light) and a conductive inner layer (aluminum cylinder).
The Drum retains electric charges on the surface in the dark, and becomes conductive when
exposed to light.
•BCR
The BCR (Bias Charge Roll) uniformly distributes negative charges on the Drum surface.
• Auger
The Auger is a spiral mixer to stir toner supplied from the Toner Cartridge and carriers in the
Xero/Deve Cartridge.
• Magnet Roll
The Magnet Roll retains developer in a thin layer on its surface, and feeds toner to the gap
between the Drum and the Magnet Roll.
•Finger
The Finger is a mechanism to prevent paper from being caught.
• Cleaning Blade
The Cleaning Blade scrapes toner remaining after the transfer step off the drum surface.
HSG ASSY-BTR
The BTR of the HSG ASSY-BTR is driven by direct contact with the Drum of the CRU.
The BTR applies positive charges to the rear surface of the paper when the paper passes
between the BTR and Drum. The negatively charged toner image is attracted by positive
charges on the rear surface of the paper. Thus, the toner image is transferred from the drum
surface to the paper surface.
5.5” x 13” SEF (Legal) 215.9 330.2
5.5” x 14” SEF (Legal) 215.9 355.6
DL LEF 220 110
C5 LEF 229 162
C4 SEF 229 324
Rectangular LEF 235 120
Com10 LEF 241.3 104.8
B5 LEF 257 182
B4 SEF 257 364
Executive LEF 266.7 184.2
16K LEF TFX(PRC) 267(270) 194(195)
8K SEF TFX(PRC) 267(270) 389(390)
8.5” x 11” SEF (Letter) 279.4 215.9
11” x 17” LEF 279.4 431.8
A4 LEF 297 210
A3 SEF 297 420
Stopper (max.) 303 -