OKI 8c Maintenance Manual

OKIPAGE8c
LED Page Printer

ODA/OEL/INT

1997.11.19

MAINTENANCE

MANUAL

PREFACE

This maintenance manual provides procedures and techniques for the troubleshooting, maintenance, and
repair of OKIPAGE 8c.

This manual is written for maintenance personnel, but it should always be accompanied with the OKIPAGE
6c User’s Manual for procedures for handling and operating OKIPAGE 8c, For repairing each component
of OKIPAGE 8c, see the Troubleshooting manual.

[Notices]
The contents of this manual is subject to change without prior notice.
Although reasonable efforts have been taken in the preparation of this manual to assure its accuracy, this
manual may still contain any errors and omissions. OKI will not be liable for any damage caused or alleged
to be caused, by the customer or any other person using this maintenance manual to repair, modify, or
alter OKIPAGE 8c in any manner.

[Warning]
Many parts of OKIPAGE 8c are very sensitive and can be easily damaged by improper servicing. We
strongly suggest that OKIPAGE 8c be serviced by OKI’s authorized technical service engineers.

CONTENTS

1. SPECIFICATIONS ....................................................................................... 1-1

1.1 Basic System Configuration .......................................................................................1-1

1.2 Printer Specifications ................................................................................................. 1-2

1.3 Option Specifications ................................................................................................. 1-3

1.4 Basic Specifications ...................................................................................................1-4

2. OPERATION................................................................................................ 2-1

2.1 Main Control Board (PCR PCB)................................................................................. 2-2

2.2 Engine Control Board (PX4 PCB) ..............................................................................2-5

2.3 Power/Board .............................................................................................................. 2-6

2.4 Mechanical Processes ...............................................................................................2-7

2.4.1 Electrophotographic processing mechanism ................................................2-8

2.4.2 Paper running process ................................................................................. 2-14

2.5 Sensors...................................................................................................................... 2-23

2.5.1 Paper related sensors .................................................................................. 2-23

2.5.2 Other sensors ............................................................................................... 2-24

2.6 Correction of Color Deviation ..................................................................................... 2-25

2.7 Transfer Control according to Environmental Changes

(Room Temperatures and Relative Humidities)......................................................... 2-25

2.8 Form Jam Detection................................................................................................... 2-26

2.9 Cover Opening........................................................................................................... 2-26

2.10 Toner Low Detection.................................................................................................. 2-27

2.11 Page Size Detection .................................................................................................. 2-28

2.12 Power-on Processing................................................................................................. 2-29

2.12.1 Self-diagnostic test .......................................................................................2-29

3. PARTS REPLACEMENT............................................................................. 3-1

3.1 Precautions for Parts Replacement ........................................................................... 3-1

3.2 Parts Layout............................................................................................................... 3-3

3.3 How to Change Parts................................................................................................. 3-7

3.3.1 Cover Assy Rear .......................................................................................... 3-8

3.3.2 Motor -Fan (80-25) ....................................................................................... 3-9

3.3.3 Paper Eject Assy .......................................................................................... 3-10

3.3.4 Cover Assy Stacker, Guide Eject FD Assy ...................................................3-11

3.3.5 Frame Assy Upper........................................................................................ 3-12

3.3.6 Plate Support Assy ....................................................................................... 3-13

3.3.7 Limmiter 2way (L), (R)/Plate Guide (L), (R) ..................................................3-14

3.3.8 Cover ............................................................................................................ 3-15

3.3.9 PCB Assy : PCR ...........................................................................................3-16

3.3.10 Motor Fan (CU)............................................................................................. 3-17

3.3.11 PXF PCB/PX4 PCB ...................................................................................... 3-18

3.3.12 Gear Heat Assy ............................................................................................3-19

3.3.13 Main Motor (A), (B)Assy ............................................................................... 3-20

3.3.14 Gear One-way (Z30)..................................................................................... 3-21

3.3.15 Motor Assy BT .............................................................................................. 3-22

3.3.16 Power Supply Unit, Holder Inlet, Sheet Insuration ....................................... 3-23

3.3.17 Sensor Assy Box Toner ................................................................................ 3-24

3.3.18 Square-shaped Connector ........................................................................... 3-25

3.3.19 Hopping Motor.............................................................................................. 3-26

3.3.20 Gear One-way .............................................................................................. 3-27

3.3.21 Feeder Unit Front ......................................................................................... 3-28

3.3.22 Mannual Feed Hopper Assy......................................................................... 3-29

3.3.23 Guide Paper Input Assy................................................................................3-30

3.3.24 Lever Input Sensor ....................................................................................... 3-31

3.3.25 Roller Registration, Roller Assy Hopping ..................................................... 3-32

3.3.26 Roller Hopping.............................................................................................. 3-33

3.3.27 PXU PCB/PXM PCB, Lever Regist Sensor ..................................................3-34

3.3.28 Paper End Lever...........................................................................................3-35

3.3.29 PCO PCB (Operator Panel).......................................................................... 3-36

3.3.30 Holder Gear Toner Assy............................................................................... 3-37

3.3.31 Plate Latch Lever (FD), Spring Latch Lever (FD) ......................................... 3-38

3.3.32 Belt Cassette Assy ....................................................................................... 3-39

3.3.33 High Voltage Power Supply Unit, Bracket HV (BT) Assy ............................. 3-40

3.3.34 Eraser Bracket Assy, Eraser Bracket(KCM) Assy........................................ 3-41

3.3.35 Shaft Link...................................................................................................... 3-42

3.3.36 Contact (BL-R) Assy, Contact (CL-R) Assy.................................................. 3-43

3.3.37 Contact (BL-L) Assy, Contact (CL-L) Assy................................................... 3-44

3.3.38 Contact SB Assy........................................................................................... 3-45

3.3.39 PXC PCB...................................................................................................... 3-46

3.3.40 Heat Unit Assy.............................................................................................. 3-47

3.3.41 Oil Roller Assy.............................................................................................. 3-48

3.3.42 Lever Lock Heat (L) / (R), Guide Side Heat, Spring Lock............................. 3-49

3.3.43 PXL PCB ...................................................................................................... 3-50

3.3.44 Heat Unit Guide Assy ................................................................................... 3-51

3.3.45 Holder LED Assy, LED Head........................................................................ 3-52

4. ADJUSTMENTS .......................................................................................... 4-1

4.1 Maintenance Modes and Their Functions.................................................................. 4-1

4.1.1 User maintenance mode .............................................................................. 4-1

4.1.2 System maintenance mode.......................................................................... 4-5

4.1.3 Engine maintenance mode........................................................................... 4-7

4.2 Adjustments after Parts Replacement ....................................................................... 4-10

4.2.1 Setting the LED head driving time................................................................ 4-10

4.2.2 Color deviation correction............................................................................. 4-12

5. PERIODIC MAINTENANCE ........................................................................ 5-1

5.1 Periodically Replaced Parts .......................................................................................5-1

5.2 Cleaning..................................................................................................................... 5-1

5.3 Cleaning the LED Lens Array ....................................................................................5-1

5.4 Cleaning the Pickup Roller......................................................................................... 5-1

6. TROUBLESHOOTING PROCEDURES ...................................................... 6-1

6.1 Troubleshooting Tips .................................................................................................6-1

6.2 Points to Check before Correcting Image Problems.................................................. 6-1

6.3 Tips for Correcting Image Problems .......................................................................... 6-1

6.4 Preparation for Troubleshooting ................................................................................ 6-2

6.5 Troubleshooting Flow................................................................................................. 6-2

6.5.1 LCD status message/trouble list ...................................................................6-2

6.5.2 LCD message troubleshooting .....................................................................6-14

6.5.3 Image troubleshooting .................................................................................. 6-27

7. WIRING DIAGRAM..................................................................................... 7-1

7.1 Resistance Check ......................................................................................................7-1

7.2 Program/Font ROM Location .....................................................................................7-5

8. PARTS LIST ................................................................................................ 8-1

Appendix A ....................................................................................................... A-1

Appendix B ....................................................................................................... B-1

Appendix C ....................................................................................................... C-1

1. SPECIFICATIONS

M M M

M M

M

M M

LED head

Discharging indicators

Centronics

interface

OKI HSP

Controller

Junction board

Pulse motors

Engine controller

Low-voltage

power unit

Fixing unit

High-voltage

power unit

Second tray

Belt unit

<Sensors, switches, and thermistors>

Paper width sensor

Form size detector (4 bits)

Form end sensor

FF form end

FF home switch

Form feed sensor 1

Form feed sensor 2

Write sensor

Ejection sensor

Toner Low (Y.M.C.K)

EP Up/Down (Y.M.C.K)

Waste toner sensor

Resist Up/Down

Cover open switch (High-voltage

interlock switch)

Heater temperature thermistor

Backup temperature thermistor

Environment temperature sensor

Environment humidity sensor

Oil Roller switch

Fixing unit interlock switch

Waste toner box switch

Y-EP unit M-EP unit C-EP unit B-EP unit

PSIMM

x2

interface

SIMM

x2

interface

Y EP M EP C EP K EP BELT HEATER REGIST FF

Operator panel

1. SPECIFICATIONS

1.1 Basic System Configuration

The basic system configuration of OKIPAGE 8c is illustrated in Figure 1.1.

Figure 1.1

1 - 1

1.2 Printer Specifications

This printer unit is composed with the following hardware.

• Electro-photographric processor

• Paper feeder

• Controller (Cu part / PU Part)

• Operator panel

• Power board (High voltage part / PU part)
Figure 1-2 show the printer unit configuration.

Face-up Stacker Assy

Stacker Cover Assy

Rear Cover

Side Cover (L) Assy

Base Unit

Figure 1.2

I/F Cover Assy

Operator Panel Assy

1 - 2

1.3 Option Specifications

Options available for OKIPAGE 6c are as follows.
(1) 2nd-Feeder

(2) RAM SIMM module (72 pin SIMM, 4MB/8MB/16MB/32MB)

* Make sure to use a set of 2 of the same volume size modules.

(3) PS SIMM modules (72 pin)

1 - 3

1.4 Basic Specifications

(1) Dimensions

Width: 18.8" (478mm) Length: 24.5" (622mm) Height: 14.8" (375mm)

(2) Weight

45kg (100lbs)

(3) Form

Type: Ordinary paper and OHP (Only CG3710)
Sizes: Letter, Legal (13"or 14"), Executive, A4, A5, B5, and A6 (1st tray and front feeder)
Reams: 1st tray 16lbs to 28lbs

2nd tray 20lbs to 28lbs
Front feeder 16lbs to 32lbs

(5) Printing speed

8 pages per minute (OHP: 6 pages per minute)

(6) Resolution

600 dots per inch x 600 dots per inch

(7) Input voltage

120VAC +5.5%, -15%
230VAC to 240VAC +10%, -14%

(8) Power consumption

Peak: Typical operation
Idle: Power-save mode

(9) Frequency

50Hz or 60Hz +2%, -2%

(10) Noises

Operating: 50dB
Standby: 45dB
Power-saving: 43dB

(11) Expendibles and service life

Toner cartridge: 1500 pages (5% duty) (each of Y, M, C, and K)
Image drum: 10,000 pages (5% duty, continuous) (each of Y, M, C, and K)
Maintenance Kit: 7,500 (A4) pages (12 toner cartridges in total) (5% duty,
[Box Toner Assy + Holder 50% color printing and 50% monochromatic printing)
Assy Oil Roller]

(12) Periodically-replaced parts

Heat Unit Assy: 50,000 pages
Belt Cassette Assy: 50,000 pages

1 - 4

(13) Temperatures and relative humidities
Temperature

Temperature conditions

Temperature (in _F) Temperature (in _C) Remarks

Operating

Non-operating
Storage (1 year max.)
Delivery (1 month max.)
Delivery (1 month max.)

50 to 89.6

32 to 109.4

-14 to 109.4

-20 to 158

-20 to 122

Humidity

Humidity condition

Relative humidity (%) Wet-bulb temperature Remarks

Operating

Non-operating
Storage
Delivery

20 to 80

10 to 90
10 to 90
10 to 90

for the packed unit only

10 to 32

0 to 43

-10 to 43

-29 to 70

-29 to 50

25

26.8
35
40

17_C to 27_C (for assurance
of full-color printout quality)

Power off
with drum and toner
with drum and no toner
with drum and toner

50% to 70% (for assurance of
full-color printout quality)

Power off

(14) Printer life

3,000,000 (A4) pages or 5 years

1 - 5

2. OPERATION DESCRIPTION

2. OPERATION

AC-IN AC switch

Crimp-style terminal

PXL board

PXL

Ejection sensor

LED head: Y M C K

Discharging lamp: Y M C K

Heat roller

thermistor

Backup roller

thermistor

Heater unit

SUMi card x 4

PD6 board

Y600 14P

YPOW 12P

M600 14P

MPOW 12P

C600 14P

CPOW 12P

K600 14P

KPOW 12P

HEAD1 13P HEAD2 14P HEADPOW 12P HEAD3 15P

FF form

sensor

Toner sensor x 4

ID sensor x 4

Low-voltage power supply

6P

6P'

JST3P

FAN 1

FAN 2

3P

Oil PAD MSW

FF

motor

Paper supply sensor board

FF Pos MSW

PXM board

40095001YU

REG.POS

sensor

Resist

motor

Y-IDU

motor

M-IDU

motor

C-IDU

motor

K-IDU

motor

Belt

motor

Heat

motor

PXF board

JODEN 8P

FSENS 8P

TONER

14P

PXFIF 30P

OPTION 7P

PENDTNR 6P

PX4 board

2nd tray

(option)

Form end

sensor

Waste toner

sensor

YIDREG

8P

MCKID

12P

HETBELT

8P

HEAD3

15P

HEAD2

14P

HEAD1

13P

HEADPOW

12P

FF 12P

PXFIF 30P

HVOLT 16P COVOPN 2P PSIZE 6P

High-voltage power supply

PXC board

Form size detector

Cover open

MSW

PCR

Operator

panel

PCO

board

CM

6P

PU 40P

72PX2

PS SIMM

72PX2

D-RAM SIMM

64P

OKI HSP

36P

Paralle

CUIF 40P

POWER 30P

THE.RM 6P

RSENS 7P

Interlock switch

UPDOWN

12P

OKIPAGE 8c is a tandem color electrophotographic page printer, using technologies of 4992-LED
array, OPC, dry single-component non-magnetic developing, roller transfer, heat-compression
fixing and so on. Its printing method is a Black Writing method which applies light beams to printout
areas.

Figure 2.1 shows the functional block diagram of OKIPAGE 8c.

Figure 2.1

2 - 1

2.1 Main Control Board (PCR PCB)

The control board consists of a CPU (NR4700) block, a memory control LSI block, an interface
control LSI block, a DRAM block, an EEPROM block, a mask ROM block, and an interface block.
Figure 2.2 shows the functional block diagram of the main control board (PCR PCB).

MPU Memory controller ROM, Flash Max 32M

SysAD

SysCmd

Control

NMI

INTO

NR4700
LMQ-100

ExtReg

INT1
INT2

Reset

ColdReset

VCCOK

ModeIn

ModeClock

MasterClock

(Not installed)

External Agent

SysAD

SysCmd

Control

INT

REQ

ACK
AUX

CLK

RST

OSC

Reset circuit

DIP SW

64

9
5

1
1

1
1

64

9
5
1
1

1
1
1
1

1
1
2

1

1
1
2

SysAD
SysCmd
Control

uPD94694

NMI

S1-001-F6

INT

CLK
RST

Interface controller
SysAD
SysCmd
Control
ExtReq
INT

ColdReset
VCCOK
ModeIn
ModeClk

uPU66044
GN-013-LMU

BusReq
BusAck
AUX

Reset

CLK
RSTIN
M

A

D

Control

A

D

Control

WDATA
FSYNC

Control

PU I/F
OP I/F

EEPD
EEPCLK
EEPCS0

EEPCS1

PD

PCO

PCI

D

A

C

22
64

11

11
64
25

8
4
4

9
4

1
1
1

1

8
7

4

16
18
12

10
(TE6135 (6137), 16550, 53C80)

D-RAM Max 80M

Engine
WDATA
ESYNC
Control

Operator
panel

EE-PROM #1

DI
CLK DO
CS

EE-PROM #2

DI
CLK DO
CS

74ACT1284 Bi-Centro

74ALS244

OKI HSP

Host I/F(Not installed)

PS -SIMM

Figure 2.2

2 - 2

(1) CPU

The CPU is a 64-bit RISC architecture processor (fabricated by NKK). It inputs a frequency
of 50MHz and runs at 100MHz. It transfers data to and from memory at 50MHz.

(2) Mask ROM

The mask ROM block consists of four 16Mbit (1M x 16bits) chips and total size is 8M bytes.
The chips are mounted on the PCR-PCB by means of IC sockets and stores programs and
character fonts.

(3) DRAM

The DRAM block consists of eight 16Mbit (1M x 16bits) chips and total size is 16M bytes. The
chips are mounted on the PCR-PCB and can be expanded up to 80M bytes by adding the 32M
byte SIMMs to the SIMM slots on the PCR-PCB.

(4) EEPROM

The EEPROM block consists of 1K-bit chips mounted on a board by means of IC sockets and
stores the following:

- Menu data

- Counter values

- Adjustment values

(5) Flash ROM

The Flash ROM block consists of four 4M bit (256K x 16bits) chips and total size is 2M bytes.
The chips are mounted on the PCR-PCB and used for storing fonts, macro and demo pages.

(6) Memory control LSI

This block mainly has memory control, CPU control, compression and decompression, and
video interface functions.

(7) Interface control LSI

This block mainly has PU interface control, operator panel interface control, EEPROM
control, parallel interface control, and HSP control functions.

(8) Host interface

This printer has the following interfaces to the host.

• Centronics bidirectional parallel interface

• OKI HSP interface (Option)
The single effective interface or the automatic interface select mode can be selected using

the menu. If the busy state of the printer continues for a long time period, the buffer near-full
control releases the busy status at constant intervals even if the host side is busy so not to
cause the interface time-out at the host side.

(a) Centronics bidirectional parallel interface

This is an interface conforming to IEEE-1284 and provides either of unidirectional and
bidirectional communications according to each of the following communication modes.

• Compatibility mode
Unidirectional communications from the host to the printer.

• Nibble mode
This mode transmits 4-bit wide data from the printer to the host. In this mode, each
1-byte data is transferred in the form of two nibbles using ERROR, BUSY, FAULT,
and SELECT signal leads. This mode can provide the bidirectional operation in
combination with the compatibility mode.

2 - 3

• ECP mode
This mode provides the asynchronous bidirectional interface and transmits and
receives 1-byte data using eight data signal leads under the semi-duplex control by
the host.

When the power is turned on, the compatibility mode is automatically selected. The
change to another mode from the compatibility mode is made through negotiation.
(When the BI DIRECTION is set to ENABLE in the menu, this change can be performed.)
(For the electrical/physical characteristics of this interface, see APPENDIX B)

(b) OKI HSP interface (Option)

This interface (slot) is an OKI unique universal interface that provides the platform to
connect various of boards (including those supplied by third venders) such as the LAN
connection expansion board and SCSI expansion board.
Any expansion boards compatible with this interface can be mounted on the Control
board in the piggyback board from without modifying the program at the printer side. The
conceptual diagram of the OKI HSP interface is shown in Fig. 2-3.

Printer

Network, etc.

Control board

LAN

expansion board

(For the electrical/physical characteristics of the OKI HSP interface, see the OKI HSP
interface technical manual.)

(8) RAM module

• Pin layout

1363772

• Basic specificaton

- Type: 72 pins SIIM (32 bits buss width)

- Access time: 60ns, 70ns, 80ns

- Capacity: 4, 8, 16, 32 or 64MB

- Parity: None

OKI HSP

interface

Figure 2.3

2 - 4

2.2 Engine Control Board (PX4 PCB)

NM93C66N-NW

CPU BUS

VIDEO I/F

RESET

EEPROM

VIDEO MEM

HM658512

OSC 28MHz

(Heater temperatures and print densities)

ANALOG INPUT

CPU

MSM65524

(containing AD converter)

INT

LSI
MB87D
113PFV

ROM

27512

Y HEAD I/F (3.3V)
M HEAD I/F (3.3V)
C HEAD I/F (3.3V)
B HEAD I/F (3.3V)

MT DRIVER

MTD2009F

MT DRIVER

MTD2009F

MT DRIVER

MTD2009F

PULSE MOTOR x 8

HIGH-VOLTAGE POWER SUPPLY
SERIAL INTERFACE (2 channels)

GENERAL INPUT PORT

GENERAL OUTPUT PORT

Figure 2.4

The engine control block (PU) is controlled by the engine control board (PX4 PCB) which consists
of a CPU (MSM65524), general purpose LSI chips, EPROM, EEPROM, pulse motor drivers, and
video memory. (See Figure 2.4.)

(1) CPU

This is an 8-bit CPU (OKI MSM65524) containing an AD converter and controls the whole
system.

(2) General-purpose LSI

This LSI (MB87D113PFV) is provided in the printer engine control block and has controller­engine video interface, LED interface, motor control, sensor input, video memory control,
main scanning color correction, skew correction, high-voltage power control, and OST-EX2
functions.

2 - 5

(3) EPROM

This EPROM (27C512-150) has a storage capacity of 512K bits and stores programs for the
PU block.

(4) EEPROM

This EEPROM (NM93C66N-NW) having a storage capacity of 4K bits is mounted on the
board by means of IC socket and stores adjustment values etc.

(5) Pulse motor drivers

These drivers (MTD2005F) drive eight pulse motors for moving up and down the EP and
transferring medium.

(6) Video memory

This SRAM receives print data through video interface and stores it.

2.3 Power/Board

The power board consists of an AC filter circuit, a low voltage power supply circuit, a high voltage
power supply circuit, and heater drive circuit, and photosensors.

(1) Low voltage power supply circuit

This circuit generates the following voltages.

Output voltage Use

+3.3 V CU Unit CPU, LED HEAD
+5 V Logic circuit supply voltage
+32 V Motor and fan drive voltage and source voltage for high-voltage supply, dischange lamp
+12 V HSP, OP Amp, high voltage power supply
–12 V HSP

(2) High voltage power supply circuit

This circuit generates the following voltages necessary for electro-photographic processing
from +32 V according to the control sequence from the control board. When cover open state
is detected, +32 V supply is automatically interrupted to stop the supply of all the high-voltage
outputs.

Output Voltage Use Remarks

CH -1.35 KV ± 50V Voltage applied to charging roller
DB Normal paper Voltage applied to developing roller

Y. M. C. K : -250V/+300V, -230V/+300V(First paper. Y only)
Transparency
Y. M. C. : -200V/+300V, K. : -240V/+300V

SB Normal paper Voltage applied to toner supply roller

Y. M. C. : -350V/+450V, K. : -450V/+450V
Transparency

Y. M. C. : -300V/+450V, K. : -400V/+450V
TR 0 to 4 KV Voltage applied to transfer roller Variable
FIX 0 to 2.5 KV Voltage applied to transfer roller Variable

2 - 6

2.4 Mechanical Processes

Paper

ejection

roller

Paper

ejection

(Face down)

Power

supply

Charging

roller

Cleaning

blade

Power

supply

Paper

path

selection

Heat roller

Ejection

roller

Fixing

Backup roller

Control signal

LED head

Developing

roller

Power

supply

Toner

cartridge

Transfer

roller

Paper

resist

Resist

roller 1

Paper

feed

Hopping

roller

Power

supply

Resist

roller 2

Paper ejection Fixing Cleaning Transferring

Paper pickup

Paper conveying Paper hopping

Movement of

paper

Rotation of

OPC drum

Transferring

Charging

Exposure

Developing

Cleaning

Paper ejection

sensor

Form feed sensor 1

Paper

ejection

(Face up)

Form feed sensor 2

Front

feeder

Paper

cassette

Paper

resist

Paper

pickup

(FF, 1ST, 2ND)

Write sensor

x 4

Y M C K

Figure 2.5 shows the mechanical processes of OKIPAGE 8c.

Figure 2.5

2 - 7

2.4.1 Electrophotographic processing mechanism
(1) Electrophotographic processes

Each process of the electrophotographic processing mechanism is outlined below.
1 Paper pickup

This process causes the roller to give a DC voltage to the paper to have a charge charge.
With this negative charge, the paper is electrostatically attracted to the roller.

2 Charging

This process gives a DC voltage to the CH roller so that the OPC drum may have a uniform
negative charge on its surface.

3 Exposure

This process causes the LED head to apply light beams according to image signals to the
negatively-charged surface of the OPC drum. The negative charge on the illuminated
surface of the OPC drum is reduced according to magnitudes of the light beams.
Thus, a latent image is formed on the surface of the OPC drum according to the resulting
surface potentials.

4 Developing and recovery of excessive toner

This process applies negatively-charged toner to the surface of the OPC drum. The toner
is electrostatically attracted to the latent image to form a visible image on the surface of
the OPC drum. Simultaneously, this process electrostatically transfers excessive toner
from the OPC drum to the developing roller.

5 Transferring

This process fits paper to the surface of the OPC drum, applies positive charge (opposite
to the charge of the toner) to the back side of the paper from the transfer roller. The toner
image is transferred to the paper.

6 Cleaning

Cleaning blade scrapes off the remaining toner from the OPC drum which has been used
to transfer.

7 Fixing

This process fixes the toner image on the paper by pressing and fusing the image.

2 - 8

(2) Paper pickup

Pickup roller

Paper (medium)

Conveying belt

A

Conveying belt

Driven roller

B

Power
supply

A DC voltage (0V to 2KV) is applied to the driven roller A to negatively charge the lower
surface of the paper. The negatively-charged paper is electrostatically attracted to the pickup
roller. With this, the paper is in close-contact with the conveying Belt and conveyed steadily.

2 - 9

(3) Charging

This process applies a DC voltage to the charging roller in contact with the surface of the OPC
drum.

Power

supply

unit

OPC drum

Charging roller

(4) Exposure

The light beams from the LED head are applied to the surface of the OPC drum which is
charged negatively. The negative charge on the illuminated surface of the OPC drum is
reduced according to magnitudes of the light beams and a latent image is formed on the
surface of the OPC drum according to the resulting surface potentials.

Power
supply

unit

Charging roller

OPC drum

LED head

Paper

LED head

OPC drum

2 - 10

(5) Developing

This process applies toner to the latent image on the surface of the drum to convey it into a
toner image. Developing is carried out on the surface of the OPC drum at which the OPC drum
is in contact with the developing roller.

1 The sponge roller transfers toner to the developing roller. The toner is charged

negatively.

Developing toner blade

Charging roller

Sponge roller

Developing roller

OPC drum

2 The toner blade scrapes away excessive toner on the developing roller to form a thin

film of toner on the surface of the developing roller.

3 The toner is attracted to the latent image on the surface of the OPC drum at which

the OPC drum is in contact with the developing roller. The latent image on the
surface of the OPC drum is made visible with the toner.

2 - 11

(6) Transferring

The transfer roller made of conductive sponge presses the paper
against the surface of the OPC drum so that the paper may be close contact with the surface
of the OPC drum.
This process fits the paper to the surface of the OPC drum by the transfer roller and applies
positive charge (opposite to the charge of the toner) from under the paper.
When a positive high voltage is applied to the transfer roller from the power supply, the
positive charge induced on the transfer roller jumps to the upper surface of the paper at which
the transfer roller touches the paper and attracts the negatively-charged toner from the
surface of the OPC drum onto the surface of the paper.

OPC drum

Paper

Transfer roller

Power

supply unit

2 - 12

(7) Fixing The toner image just transferred to the paper is fused and fixed to the paper while

the paper is passing through the gap between the heat roller and the backup roller.
The teflon-coated surface of the heat roller is heated up by the 800-watt heater (or a
halogen lamp) provided in the heat roller. The temperature of the heat roller surface is
controlled by a thermistor in contact with the surface of the heat roller. A thermostat is
provided for safety. When the heat roller temperature goes higher than the preset
temperature, the thermostat opens and shut off power to the heater in the heat roller.
The backup roller is evenly pushed against the heat roller by two end springs.

Heater

Paper

Heat roller

Thermistor

Backup roller

(8) Cleaning

After the toner image is transferred to the paper, the cleaning roller electrostatically attracts
toner which is left untransferred on the OPC drum to the cleaning roller. The toner is returned
to the OPC drum for re-use.

OPC drum

Cleaning blade

Transfer roller

2 - 13

2.4.2 Paper running process

face down stacker

oil roller

fuser

low-voltage power supply

AC switch

density sensor

transfer roller

x

4 light rejector

x

4

transfer belt unit

ID unit up / down actuater

belt cleaning

high voltage power supply

adsorption roller

pinch roller up / down

transfer belt

1st tray

2nd tray

front feeder

KCMY

I/D unit

LED Head

pinch roller 2

pinch roller 1

regist

roller 2

regist

roller 1

hopping roller

backup roller

Eject roller

oil cleaning roller

heat roller

Figure 2.6 shows how paper moves in the OKIPAGE 8c.

Figure 2.6 Paper Route

2 - 14

(1) Paper hopping and transfer and up/down movement of pinch roller 2

Paper is hopped and delivered by the mechanism shown below. This mechanism is driven
by a single pulse motor.

Resist roller 2

One-way gear C

Resist roller 1

Idle gear C

One-way gear B

Idle gear A

a

b

Idle gear B

First hopping roller

Pulse motor

One-way gear A

The pulse motor turns in the arrow direction (a) and drives the hopping roller in the direction of
“b.” The hopping roller drives the resist roller.
Each of the one-way clutch gears A, B, and C has a one-way clutch to prevent the rollers from
rotating reversely.

2 - 15

(a) Hopping

1 The pulse motor turns in the arrow direction of “a” (counterclockwise) and drives the

hopping roller to move the paper until the Entrance sensor turns on. Although the one­way gears B and C are also driven, the resist roller 2 does not turn because the
reverse rotations of the one-way clutch gears are not transmitted to the resist roller.

2 After the Entrance sensor turns on, the hopping roller keeps on feeding the paper until

it hit the resist roller 1. (This operation corrects any paper skew.)

One-way gear C

Resist roller 1

Resist roller 2

One-way gear B

Entrance sensor

Paper

a

First hopping roller

(b) Conveying

1 After paper hopping is completed, the pulse motor turns right (in the direction of “b”)

to drive the resist rollers 1 and 2. The resist rollers feed the paper until the Form
sensor turns on.
Although the one-way gear A is also driven, the hopping roller does not turn because
of the one-way clutch.

2 The paper is further fed in synchronism with the print data.

Form sensor

Resist roller 1

Paper

One-way gear A

Resist roller 2

b

First hopping roller

2 - 16

(2) The hopping operation of the front feeder and the up/down operation of the pinch roller 2 are

performed by a single pulse motor, as shown below.

Cam

b

a

Idle gear A

One-way clutch gear B

Sensor position

From front

Hopping roller

One-way clutch gear A Idle gear B

Entrance sensor

Up/down

Pinch roller

Form sensor

Resist roller 2

When the pulse motor of the front feeder turns right (in the direction of “A”), the front hopping
roller turns left (in the direction of “b”) to drive the cam. This cam moves up and down
the pinch roller 2. The one-way clutch gears are made to turn only in a preset direction by
means of the one-way clutches.

2 - 17

(a) First and second hopping rollers

1 When the front edge of the paper passes by the pickup roller, the pulse motor of the

front feeder turns left (in the direction of “b” to drive the cam. The cam moves up the
pinch roller 2. Although the one-way clutch gear A is also rotating, the hopping roller
of the front feeder does not rotate by means of the one-way clutch.

2 When the rear edge of the paper passes by the Entrance sensor 2, the pulse motor

of the front feeder turns left (in the direction of “b”) to drive the cam. The cam moves
down the pinch roller 2 until it is sensed by the sensor. Although the one-way clutch
gear A is also rotating, the hopping roller of the front feeder does not rotate by means
of the one-way clutch.

Cam

b

One-way clutch gear B

Idle gear A

Hopping roller

One-way clutch gear A

Idle gear B

b

b

Paper from the tray

b

Entrance sensor 2

b

Up

Cam

Sensor

Pickup roller

Form sensor

Pinch roller 2

Resist roller 2

2 - 18

(b) Front feeder hopping

1 The pulse motor of the front feeder turns right (in the direction of “a” to drive the

hopping roller. The paper is fed until the Entrance sensor 2 turns on. Although the
one-way clutch gear B is also rotating, the pinch roller 2 does not drive the up/down
cam by means of the one-way clutch.
After turning on the Entrance sensor, the paper is further fed until it hits the resist roller

2. (This operation corrects any paper skew.)

Idle gear A

Hopping roller

One-way clutch gear A

Paper from front feeder

(c) Conveying

1 After paper hopping is completed, the pulse motor turns right (in the direction of “b”)

2 Although the one-way gear A is also driven, the first hopping roller does not turn

a

b

Idle gear B

Entrance sensor 2

One-way clutch gear B

Cam

Sensor

Pickup roller 2

Form sensor

Resist roller 2

to drive the resist rollers 1 and 2. The resist rollers feed the paper until the Form
sensor turns on.

because of the one-way clutch.

Paper

Form sensor

Resist roller 2

b

One-way gear A First hopping roller

2 - 19

(2) Up/down movement of the I/D unit and rotation of the EP drum

The up/down movement of the I/D unit and the rotation of the EP
drum are performed by a mechanism shown below. (See Figure 2.6-a) This mechanism is
driven by a single pulse motor.
When the pulse motor turns left (CCW), the up/down gear turns left (in the direction of “a”) and
the up/down lever (see Figure 2.6-b) moves up (in the direction of “ ”). The up/down lever
pushes up the up/down actuator of the I/O unit. The I/D unit moves up as shown in Figure

2.6-b. The EP drum rotates freely.

a

Up/down gear

Z53/44

b

Z25/75

CCW

Pulse motor

CW

Z67/43/24

EP drum gear

CCW

Figure 2.6-a

When the pulse motor (see Figure 2.6-a) turns right (CW), the EP drum gear turns left (CCW)
and the up/down gear (one-way gear) is released. The weight of the I/D unit is applied to the
up/down lever via the up/down actuator of the I/O unit. The free up/down gear turns right (in
the direction “b” in Figure 2.6-a) and the I/D unit goes down until the up/down actuator of the
I/D unit is stopped by the up/down lever. (See Figure 2.6-c.) During this, the image is
transferred onto the running paper.

2 - 20

Figure 2.6-b

I/D unit up/down actuator

Up/down lever

I/D unit

Up/down lever

I/D unit

Figure 2.6-c

2 - 21

(3) Lubrication and cleaning of fixing, ejecting, and heat rollers

a

a

Ejection roller

Oil cleaning roller

a

a

Face-down stacker

Oil roller

a

Hear roller

a

a

The fixing roller, the ejecting
roller, and the heat roller are lu­bricated and cleaned by a single
pulse motor.
When the heat roller pulse motor
turns right (in the direction of “a”),
the heat roller and the backup
roller turn left (in the direction of
“a”) to fix a toner image onto the
paper.
At the same time, three ejection
rollers turn right (in the direction
of “a”) to eject the paper. The oil
roller and the oil cleaning roller
turn left (in the direction of “a”) to
supply oil to the surface of the
heat roller and clean the surface.

Backup roller

Heat motor

Fixer

2 - 22

2.5 Sensors

2.5.1 Paper related sensors

Ejection roller

Heat roller

Ejection sensor

Backup roller

Sensor
FF sensor 1/2
(Entrance sensor 1/2)
Form width sensor

Write sensor

Ejection sensor

K drum Y drumM drumC drum

Pickup roller

Driving roller

Driven rollers

Resist roller 2

Belt cleaning blade

Function
Detects the front edge of an incoming paper sheet and determines
timing to change from hopping to conveying.
Senses the width of the paper sheet.

Detects the front edge of the conveyed paper sheet and determines the
length of the paper sheet from the time period elapsed before the front
edge of the paper reaches the sensor.
Detects the front and rear edges of a paper sheet and determines
whether the paper is ejected.

Conveying belt

First hopping roller

Second hopping roller

Write sensor

Pinch roller 2

FF sensor 2

Sensor status
ON: Front edge detected
OFF: Front edge not detected
ON: A4 size or bigger
OFF: Smaller than A4 size
ON: Form present
OFF: Form absent

ON: Form present
OFF: Form ejected

FF hopping roller

Form width sensor

Pinch roller 1
Resist roller 1

Auxiliary rollers

FF sensor 1Ejection shock sensor

2 - 23

2.5.2 Other sensors
1 Form end sensor

This sensor checks whether the paper cassette is empty.

2 FF form end sensor

This sensor checks whether the front feeder has paper.

3 FF home switch

This microswitch checks whether the front feeder stage is in the up or down position.

4 EP up/down sensor (one for each color Y, M, C, K)

This sensor checks whether the I/D unit is in the up or down position.

5 Waste toner sensor This sensor judges whether the waste toner cartridge is full by

measuring a time period at which the sensor lever turns on periodically. When the time
period falls under a preset value, the system judges that the waste toner cartridge is full
and displays the “either waste toner or oil roller life” message.

6 Resist up/down sensor

This sensor detects the up or down position of the resist roller 2.

7 Density sensor

Refer to 2.6 (Density Correction).

8 Temperature sensor

Refer to 2.8 (Transfer Control according to Environmental Changes).

9 Humidity sensor

Refer to 2.8 (Transfer Control according to Environmental Changes).

2 - 24

2.6 Correction of Color Deviation

OKIPAGE 8c is equipped with an array of I/D units which cannot be from generation of color
deviations. This mechanically­caused color deviation is corrected electronically as shown below.

(1) Color deviations to be corrected

1 Color deviation in the X axis (Positional error of the LED head)
2 Diagonal color deviation (Positional error of the LED head)
3 Color deviation in the Y axis (Positional errors of the I/D units and light receivers)

(2) Method of correction Print out the preset color chart, compare the printed color chart by

the original color chart, and enter the amount of color deviation of each color from the
operator panel or from the host computer. OKIPAGE 8c calculates correction values from
the entered values and changes the write timing of each color (cyan, magenta, and
yellow) relative to black.

2.7 Transfer Control according to Environmental Changes (Room Temperatures and
Relative Humidities)

OKIPAGE 8c measures the room temperature and the relative humidity by the room tempera­ture sensor and the room humidity sensor, calculates an optimum transfer voltage according to
the obtained environmental conditions and realtime-controls printing with the optimum transfer
voltage.

2 - 25

2.8 Form Jam Detection

OKIPAGE 8c checks for a paper jam when the page printer is powered on and during printing.
When finding a paper jam, OKIPAGE 8c immediately stops the printing process. To recover
the printer, open the cover, find and remove the paper jam, then close the cover.

Error

Form feeding jam
Conveying jam
Ejection jam
Form size error

Three hopping operations are made, but the Form Feed sensor (Entrance) 2 does not turn on a preset
time after the Form Feed sensor 1 turns on.
The ejection sensor 2 does not turn on a preset time period after the Write sensor detects the front end
of paper.
The ejection sensor detected the front edge of the paper but does not detect the rear edge of the paper
for a preset time period.
The form size obtained by measuring the time period before the rear edge of the paper passes by the
Form Feed sensor 2 after the front edge of the paper passed the Write sensor is longer by 45mm than
the specified form length.

2.9 Cover Opening

When the upper, side, or front cover of OKIPAGE 8c is opened, the Cover Open microswitch
turns off, a voltage of 32V to the high-voltage power supply is shut off, and all high-voltage
outputs are shut off. At the same time, the CPU receives a signal (CVOPN) indicating the
status of the microswitch and performs the cover open processing.

PX4-PCB

CPU

65524

+32V

Conditions

Upper cover

microswitch

Side cover

microswitch

Front cover
microswitch

P4.7

12

COVOPN (2P)

High-voltage power supply board

HVOLT (16P)

High-voltage power supply unit

2 - 26

2.10 Toner Low Detection

• Composition

The device consists of the stirring gear which rotates at a constant rate, the stirring bar and
the magnet on the stirring bar. The stirring bar rotates through the link on the protrusion in
the stirring gear.

Magnet

Stirring Bar Stirring Gear

• Operation

Toner Low is detected by monitoring the time interval of the encounter of the magnet set on
the sensor lever and the magnet on the stirring bar.

Stirring Gear Section

Operation during toner full state

• The stirring bar rotates due to the interlocking

with the stirring gear.

• Even when the magnet on the stirring bar

reaches the maximum height, since the other
side is being dipped in the toner, the stirring bar
is pushed by the stirring gear.

Stirring Bar

Toner Sensor

Protrusion

Sensor Lever

Operation during toner low state

• When the stirring bar reaches the maximum

height, since there is no resistance provided by
the toner on the other side, it falls to the mini­mum height due to its own weight. Because of
this, the time interval during which it is in en­counter with the magnet of the sensor lever
becomes long. By monitoring this time interval,
toner low can be detected.

2 - 27

Stirring Bar

Sensor Lever

TONER FULL state

TNRSNS

t1

1.965 SEC.

t1 < 0.74 SEC (Y)
t1 < 1.165 SEC (M, C, K)

TONER LOW state

TNRSNS

t1

1.965 SEC.

t1 > 0.74 SEC (Y)
t1 > 1.165 SEC (M, C, K)

• When the toner low state is detected 2 times consecutively, Toner Low is established.

• When the toner full state is detected 2 times consecutively, Toner Low is cancelled.

• When there is no change with the toner sensor for 2 cycles (1.965 sec. x 2) or more, then the

Toner Sensor Alarm is activated.

• The toner sensor is not monitored while the drum motor is in halt.

2.11 Page Size Detection

The four tab pieces are driven according to the setting position of the paper guide through the cam
interlocked with the paper guide of the paper cassette.

When the paper cassette is inserted into the printer, the state of the tab pieces is detected by the
microswitch to recognize the paper size.

State of Microswitches Paper size

SW1 SW2 SW3 SW4

0111Letter
0101Executive
0011A4
1110Legal 14
1011Legal 13
1101B5
1100A5
1001A6

2 - 28

2.12 Power-on Processing

2.12.1 Self-diagnostic test
(1) Initial test

The following checks are automatically performed when the OKIPAGE 8c page printer is
powered on:
(a) ROM check
(b) RAM check
(c) EEPROM check
(d) Flash ROM check

(2) ROM check

(a) Checks ROM by comparing the sum of bits in a received data unit by the number of bits

in the transferred data unit.

(3) RAM check

(a) Checks RAM by writing a preset data pattern in RAM, reading the contents of RAM, and

comparing the data read from RAM by the data written in RAM. (Write-read test)
(b) Checks optional RAM if it is installed.
(c) Checks resident RAM by exclusively ORing high and low addresses (to prepare 16-bit

data units), writing a preset 16-bit data pattern in RAM, reading the contents of RAM, and

comparing the data read from RAM by the data written in RAM. Checks optional RAM

by writing and reading 32-bit fixed patterns (“5555h” and “aaaah”) in optional RAM.

(4) EEPROM check

(a) Checks ID numbers stored in the fixed addresses of EEPROM.
(b) Checks the content of the menu area by control firmware and the engine area by engine

firmware.

(5) Flash ROM check

Checks Flash ROM by writing a present data pattern in Flash ROM, reading the contents of

Flash ROM, and comparing the data read from Flash ROM by the data written in Flash

ROM. (Write-read test).

(6) Option unit check

Checks whether the optional units (such as the second tray, PS SIMM, and so on) have been
installed before entering the operation mode.

2 - 29

3. P ARTS REPLACEMENT

3. PARTS REPLACEMENT

The section explains the procedures for replacement of parts, assemplies, and units in the field.
Only the removal procedures are explained here. Reverse the procedure for the installation.

3.1 Precautions for Parts Replacement

(1) Before starting parts replacement, remove the AC cable and interface cable.

(a) Remove the AC cable in the following procedure:

i) Turn off ("o") the power switch of the printer

ii) Disconnect the AC inlet plug of the AC cable from the AC receptacle.

iii) Disconnect the AC cable and interface cable from the printer.
(b) Reconnect the printer in the following procedure.

i) Connect the AC cable and interface cable to the printer.

ii) Connect the AC inlet plug to the AC receptacle.

iii) Turn on ("l") the power switch of the printer.

Disconnect

(2) Do not try disassembly as long as the printer is operating normally.
(3) Do not remove unnecessary parts: try to keep disassembly to a minimum.
(4) Use specified service tools.
(5) When disassembling, follow the determined sequence. Otherwise, parts may be damaged.
(6) Since screws, collars and other small parts are likely to be lost, they should temporarily be

(7) When handling ICs such as microprocessors, ROM and RAM, and circuit boards, do not wear

(8) Do not place printed circuit boards directly on the equipment or floor.

Connect

attached to the orginal positions.

gloves that are likely to generate static electricity.

3 - 1

[Service Tools]
Table 3-1 shows the tools required for field replacement of printed circuit boards and units.

Table 3-1 Service Tools

No.

1

2

3

4

5

6

7 1

8

No. 1-100 Philips
screwdriver

No. 2-200 Philips
screwdriver, Magnetized

No. 3-100 screwdriver

No. 5-200 screwdriver

Digital multimeter

Pliers

Handy cleaner

LED Head cleaner
P/N 4PB4083-2248P1

Q' ty Place of use RemarksService Tools

1

2~2.5 mm screws

1

3~5 mm screws

1

1

1

1

1

Cleans LED head

3 - 2

3.2 Parts Layout

Figure 3-1

3 - 3

Figure 3-2

3 - 4

Figure 3-3

3 - 5

Figure 3-4

3 - 6

3.3 How to Change Parts

Printer Unit

Cover Assy Rear (3.3.1)

Cover (3.3.8)

Belt Cassette Assy (3.3.32)

Heat Unit Assy (3.3.40)

Oil Roller Assy (3.3.41)

Holder LED Assy (3.3.45)

Frame Assy Upper (3.3.5) Plate Support Assy (3.3.6) Limiter 2Way (L), (R) (3.3.7)

/Plate Guide (L) ,(R)

Motor Fan (80-25) (3.3.2)

Paper Eject Assy (3.3.3)

Cover Assy Stacker (3.3.4)

Guide Eject FD Assy

PCB Assy : PCR (3.3.9)

Power Supply Unit (3.3.16)

Hopping Motor (3.3.19)

Feeder Unit Front (3.3.21)

Manual Hopper Assy (3.3.22)

PCO PCB (3.3.29)

Holder Gear Toner Assy (3.3.30)

Plate Latch Lever (FD) (3.3.31)

High Voltage Power Supply Unit (3.3.33)

Eraser BKT Assy (3.3.34)

Lever Lock Heat L, R (3.3.42)

PXL PCB (3.3.43)

Heat Unit Guide Assy (3.3.44)

Moter Fan (3.3.10)

PXF PCB / PX4 PCB (3.3.11)

Gear Heat Assy (3.3.12)

Main Motor (A),(B) Assy (3.3.13)

Gear Oneway (Z30) (3.3.14)

Motor Assy BT (3.3.15)

Sensor Assy BOX Toner (3.3.17)

Square-shaped connector (3.3.18)

Gear One-way (3.3.20)

Guide Paper Input Assy (3.3.23)

Lever Input Sensor (3.3.24)

Lever 2nd Feed Sensor

Roller Registration

Roller Assy Hopping (3.3.25)

PXU PCB/PXM PCB (3.3.27)

Roller Hopping (3.3.26)

Paper End Lever (3.3.28)

Shaft Link, Lever Link (3.3.35)

Contact (BL-R, CL-R) Assy (3.3.36)

Contact (BL-L, CL-L) Assy (3.3.37)

Contact SB Assy (3.3.38)

PXC PCB (3.3.39)

This section explains how to change parts and assemblies appearing in the disassembly diagram
below.

3 - 7

3.3.1 Cover Assy Rear

1. Unscrew 2 screws 1 then lift the cover assy rear 2 a little bit, then remove the cover assy
rear by releasing the lock of two claws.

Figure 3.3.1 Cover Assy Rear

2

1

3 - 8

3.3.2 Motor-Fan (80-25)

1. Remove the cover assy rear. (See 3.3.1)

2. Unscrew 2 screws 1.

3. Detach the motor-fan 2 from the guide with its right side lifted then draw the motor-fan.

4. Unplug the cable 3 then remove the motor-fan 2.

3

Figure 3.3.2 Motor-Fan (80-25)

2

1

3 - 9

3.3.3 Paper Eject Assy
The paper eject assy comprises the frame eject assy and the guide paper eject assy.

1. Remove the cover assy rear. (See 3.3.1)

2. Open the top cover.

3. Unscrew 4 screws 1 then remove the frame eject assy 2.

4. Remove the guide paper eject assy 3 by releasing the lock of one claw.

3

claw

Figure 3.3.3 Paper Eject Assy

1x2

2

1x2

3 - 10

3.3.4 Cover Assy Stacker, Guide Eject FD Assy

1. Remove the cover assy rear. (See 3.3.1)

2. Detach the cable from the cable clamp 1 by releasing its lock.

3. Unscrew 8 screws 2 then remove the cover assy stacker.

4. Unscrew 4 screws 4 then remove the guide eject FD assy.

3

2x6

2x2

4

5

4x4

1

Cable

Figure 3.3.4 Cover Assy Stacker, Guide Eject FD Assy

3 - 11

3.3.5 Frame Assy Upper

1. Remove the cover assy rear. (See 3.3.1.)

2. Remove the cover assy stacker. (See 3.3.4.)

3. Remove the holder LED assy. (See 3.3.45.)

4. Detach the cable from the cable clamp 1 by releasing its lock.

5. Remove connections of 4 connector cables 2 and 4 cables 3.

6. Unscrew 4 screws 4 then remove the PCB 5.

7. Unscrew 2 screw 6 then remove Holder 7 by releasing the clamp of the claw.

8. Unscrew 4 screws 8 then remove the frame assy upper.

8x2

4x4

9

5

2

6

7

3

7

8x2

1

Cable

Figure 3.3.5 Frame Assy Upper

3 - 12

3.3.6 Plate Support Assy
The plate support assemblies are provided right and left. The method of those replacements is the

same.

1. Remove the heat unit assy. (See 3.3.40)

2. Remove the cover assy rear. (See 3.3.1)

3. Remove the cover assy stacker. (See 3.3.4)

4. Remove the frame assy upper. (See 3.3.5)

5. Detach the cable from the cable clamp 1 by releasing its lock.

6. Unscrew 2 screws 2 then remove the plate support assy 3.

(Be careful not to lose the spring 4 which is removed with the plate support assy 3.)

4

4

3

2

2

3

1

Cable

Figure 3.3.6 Plate Support Assy

3 - 13

3.3.7 Limiter 2way (L), (R) / Plate Guide (L) , (R)

1. Remove the plate support assy (L) and (R). (See 3.3.6)

2. Unscrew 2 screws 1 then remove the limiter 2way (L) 2 and the plate guide (L) 3.

3. Unscrew 2 screws 4 then remove limiter 2way (R) 5 and the plate guide (R) 6.

4

1

3

2

Figure 3.3.7 Limiter 2way (L), (R) / Plate Guide (L) , (R)

5

6

3 - 14

3.3.8 Cover
Describes the method of removing the cover assy side (L)/(R), cover assy OP panel, cover front
(L)/(R) and the cover rear (L).

1. Remove the cover assy rear. (See 3.3.1)

2. Remove the cover assy stacker. (See 3.3.4)

3. Unscrew 2 screws 1 then remove the frame side (L) 2.

4. Unscrew 2 screws 3 then release the lock of the claw with the cover assy side (R) 4 lifted

5. Unplug the operator panel cable 5 from the PCM PCB.

6. Open the FDR unit front in the arrow direction.

7. Unscrew 2 screws 6 then remove the cover assy OP panel7.

8. Unscrew 2 screws 8 then release the lock of the claw with the cover front (R) 9 pushed up

9. Unscrew 2 screws 0 then remove the cover front (L) A.

10. Unscrew 2 screws B then remove the cover rear (L) C.

11. Release the engagement with the guide by lifting the cover assy side (L) D, then remove the

a little bit, then remove the cover assy side (R).

then remove the cover front (R).

cover assy side (L).

6

7

B

C

1

2

A

A

5

3

4

8

9

Pushed Up

FDR Unit Front

D

A

0

Figure 3.3.8 Cover

3 - 15

3.3.9 PCB Assy : PCR

1. Open the top cover.

2. Unscrew 2 screws 1 then release the lock of the claw by lifting the cover assy side (R) 2 a

little bit, then remove the cover assy side (R).

3. Unscrew 2 screws 3 then remove the plate shield 4.

4. Unplug the operator panel cable 5 from the PCM PCB.

5. Unscrew 7 screws 6 then remove the PCB assy : PCM 7.

1

7

5

6

Figure 3.3.9 PCB Assy : PCM

2

3

4

3 - 16

3.3.10 Motor Fan (CU)

1. Open the top cover.

2. Remove the cover assy side (R), frame side (L), cover assy OP panel and the cover front (R).

(See 3.3.8)

3. Unplug the cable 1 and unscrew 2 screws 2 then remove the motor fan (CU) 3.

2

Figure 3.3.10 Motor Fan (CU)

3 - 17

3

2

3.3.11 PXF PCB/PX4 PCB
Since the PXF PCB and PXS PCB are connected with each other via the connector, remove them

at the same time.

1. Remove the PCB assy : PCM. (See 3.3.9)

2. Unscrew 4 screws 1 then remove the cover CU2.

3. Unplug all the cables 5 connected to the PXF PCB 3 and PXS PCB 4.

4. Unscrew 5 screws 6 then remove the PXF PCB3 and PXS PCB4 at the same time.

3

5

5

5

5

6

5

5

5

2

4

5

1

6

1

1

Figure 3.3.11 PXF PCB/PXS PCB

3 - 18

3.3.12 Gear Heat Assy

1. Remove the cover assy side (R), cover assy OP panel, cover front (R) and the cover rear (L).

(See 3.3.8)

2. Remove the cover CU then unplug all the cables connected to the PXS PCB and unscrew 3

screws. (See 3.3.11)

3. Unplug all the cables connected to the PXF PCB then remove the PXS PCB. (See 3.3.11)

(Be careful not to damage the connector when unplugging cables connected to the PXF
PCB.)

4. Remove the heat unit assy. (See 3.3.40)

5. Remove the guide paper eject assy. (See 3.3.3)

6. Remove the motor fan (80-25). (See 3.3.2)

7. Unscrew 5 screws 1 and unplug the cable 2 then remove the guide heat assy 3.

8. Unscrew 2 screws 4 then remove the motor (ID)5.

1

1

1

5

Figure 3.3.12 Gear Heat Assy

4

3

2

3 - 19

3.3.13 Main Motor (A), (B) Assy

1. Remove the PXF PCB and PXS PCB. (See 3.3.11)

2. Remove 4 lever Up/Dn 2 1.

3. Unplug all the cables 2 connected and unscrew 6 screws 3, then remove the main motor

(A) assy 4.

4. Unplug all the cables 5 connected and unscrew 5 screws 6, then remove the main motor

(B) assy 7.

5

2

2

4

3

2

3

1

7

5

1

3

6

5

1

6

1

6

Figure 3.3.13 Main Motor (A), (B) Assy

3 - 20

3.3.14 Gear One-way (Z30)
Four gear one-ways (Z30) are provided but the method of those replacements is the same. Do not

disassemble the gear one-ways (Z30) because they are assemblies requiring adjustment.

1. Remove the PCB assy : PCM. (See 3.3.9)

2. Remove the cover CU. (See 3.3.11)

3. Remove the 4 lever Up/Dn 2. (See 3.3.13)

4. Release the lock with the shaft by spreading the claw, then remove the gear one-way (Z30)

1.

[Notice for mounting]
Mount the gear one-way (Z30) by fitting it with the shaft with the shaft link turned in the arrow
direction.

Shaft link

Figure 3.3.14 Gear One-way (Z30)

Claw

1

3 - 21

3.3.15 Motor Assy BT

1. Remove the main motor (B) assy. (See 3.3.13)

2. Unplug 2 cables 1 connected and unscrew 2 screws 2, then remove the motor assy BT 3.

Figure 3.3.15 Motor Assy BT

3

1

2

3 - 22

3.3.16 Power Supply Unit, Holder Inlet, Sheet Insulation

1. Remove the motor-fan (80-25). (See 3.3.2)

2. Remove the frame side (L), the cover assy side (R) and the cover rear (L). (See 3.3.8)

3. Unplug the cable 1.

4. Remove the holder inlet 3 by unscrewing 2 screws 2, then remove the power switch 4 and

unplug the AC socket 5.

5. Draw the power supply unit 7 by unscrewing 2 screws 6, then unplug the cable 8.

1

6

8

7

5

4

3

2

Figure 3.3.16 Power Supply Unit, Holder Inlet, Sheet Insulation

3 - 23

3.3.17 Sensor Assy Box Toner

1. Remove the power supply unit. (See 3.3.16)

2. Unscrew the screw 1 then remove the sensor assy box toner 2 together with the bracket

3.

3. Unscrew the screw 4 then remove the sensor assy box toner 2.

Figure 3.3.17 Sensor Assy Box Toner

3

2

4

1

3 - 24

3.3.18 Square-shaped Connector

1. Draw the power supply unit. (See 3.3.16) (Do not remove the power switch and AC socket

from the holder inlet.)

2. Unplug the cable 1.

3. Unplug the cable 2 and unscrew 2 screws 3, then unplug the square-shaped connector4.

3

4

1

2

Figure 3.3.18 Square-shaped Connector

3 - 25

3.3.19 Hopping Motor

1. Remove the cover assy side (R), cover assy OP panel and the cover front (R). (See 3.3.8)

2. Unscrew 2 screws 1 and unplug the cable 2, then remove the bracket hopping motor 3.

(Be careful not to lose the gears 5, 6 and 7 which slip off at this time.)

3. Unscrew 2 screws 8 then remove the hopping motor 3.

3

1

6

8

7

8

5

2

3

Figure 3.3.19 Hopping Motor

3 - 26

3.3.20 Gear One-way

1. Remove the bracket hopping motor. (See 3.3.19)

2. Release the locks with the shaft by spreading the claws of the gear one-way 1, 2 and 3,

then remove the gear one-ways.

3

2

1

Claw

Figure 3.3.20 Gear One-way

3 - 27

3.3.21 Feeder Unit Front

1. Remove the cover assy side (R), cover assy OP panel, cover front (R) and the cover front (L).

(See 3.3.8.)

2. Remove the cover CU. (See 3.3.11)

3. Unplug the cable 1 and unscrew the screw 2, then remove the bracket FF shaft 3.

4. Remove 2 E-rings 4 then remove the feeder unit front 5.

5. Unscrew each 2 screws 6 then remove 2 bracket FF links 7.

7

6

4

5

6

4

Figure 3.3.21 Feeder Unit Front

7

3

PXF

PXS

1

2

3 - 28

3.3.22 Manual Feed Hopper Assy

1. Open the manual feed hopper assy.

2. Release the engagement between the holder and the link then remove the manual feed

hopper assy. (Be careful not to damage the holder.)

Link

Holder

Figure 3.3.22 Manual Feed Hopper Assy

3 - 29

1

3.3.23 Guide Paper Input Assy

1. Remove the cover assy OP panel, cover front (R) and the cover front (L). (See 3.3.8)

2. Remove the feeder unit front. (See 3.3.21)

3. Unscrew 4 screws 1 then draw out the guide paper input assy 2 from the left side by rotating

its upper part . (Be careful not to damage the lever sensor resist.)

Lever Sensor Resist

1

2

1

Figure 3.3.23 Guide Paper Input Assy

3 - 30

3.3.24 Two Lever Input Sensors, Lever 2nd Feed Sensor

1. Remove the guide paper input assy. (See 3.3.23)

2. Release the engagement with the guide by pressing 2 lever input sensors 2 in the arrow

direction, then remove them.

3. Release the engagement with the guide by pressing the lever 2nd feed sensor 2 in the arrow

direction, then remove the sensor.

1

2

Figure 3.3.24 Two Lever Input Sensors, Lever 2nd Feed Sensor

3 - 31

3.3.25 Roller Registration, Roller Assy Hopping

1. Remove the guide paper input assy. (See 3.3.23)

2. Remove the bracket hopping motor. (See 3.3.19)

3. Remove the gear one-way. (See 3.3.20)

4. Remove the holder gear toner assy. (See 3.3.30)
[Removal of the roller registration]

5. Remove the gear 1 and 2 bushes 2 and 2 bearings 3, then 2 roller registrations 4.
[Removal of the roller assy hopping]

6. Remove the bush 5 and the bearing 6.

7. Release the lock of the roller hopping 7 with the shaft 8 by spreading the claw, then remove

the roller hopping from the left side by sliding the shaft 8 in the arrow direction. (Be careful
not to lose the knock-pin for fastening the roller hopping 7, which slips off together.)

3

2

1

5

6

4

7

8

Figure 3.3.25 Roller Registration, Roller Assy Hopping

3 - 32

3.3.26 Roller Hopping

1. Remove the roller assy hopping. (See 3.3.25)

(Be careful not to lose the knock-pin which slips off together when removing the roller assy
hopping.)

2. Remove the 4 E-ring and then remove the 2 ROLLER Guide 3.

2. Detach the roller hopping 2 from the shaft 1.

E-ring

Knock-pin

E-ring

1

Claw

3

2

3

Figure 3.3.26 Roller Hopping

3 - 33

3.3.27 PXU PCB/PXM PCB, Lever Resist Sensor
Since the PXU PCB and PXM PCB are connected with each other via the cable, remove them at

the same time.

1. Remove the guide paper input assy. (See 3.3.23)

2. Unscrew 4 screws 1 and unplug the cable 2, then remove the PXU PCB 3 and PXM PCB

4 at the same time.

3. Remove the lever resist sensor 5 by releasing the engagement with the guide.

5

1

3

PXU PCB

Figure 3.3.27 PXU PCB/PXM PCB, Lever Resist Sensor

2

1

4

PXM PCB

1

3 - 34

3.3.28 Paper End Lever

1. Remove the guide paper input assy. (See 3.3.23)

2. Remove the paper end lever 1 by releasing the engagement with the guide.

Figure 3.3.28 Paper End Lever

1

3 - 35

3.3.29 PCO PCB (Operator Panel)

1. Remove the cover assy side (R) and the cover assy OP panel. (See 3.3.8)

2. Unscrew 4 screws 1 and unplug the operator panel cable 2.

6. Remove the PCO PCB 3 by releasing 6 claws.

(Be careful not to drop the LCD (Liquid Crystal Display) 4 and 5 which are detached
together.)

Claw (six)

1

4

5

2

3

Figure 3.3.29 PCO PCB (Operator Panel)

3 - 36

3.3.30 Holder Gear Toner Assy

1. Remove the cover assy side (R), cover assy OP panel, cover front (R) and the cover rear (L).

(See 3.3.8)

2. Unplug the cable 1 and unscrew the screw 2, then remove the holder gear toner assy 3.

2

3

1

Figure 3.3.30 Holder Gear Toner Assy

3 - 37

3.3.31 Plate Latch Lever (FD), Spring Latch Lever (FD)

1. Remove the cover assy side (R), cover assy OP panel, cover front (R) and the cover front (L).

(See 3.3.8)

2. Open the cover CU. (See 3.3.11)

3. Unplug the cable 1.

4. Unscrew the screw 2 then remove the bracket SW (side) 3.

5. Unscrew 4 screws 4 then remove the stay upper (front) 5.

6. Remove the plate latch lever (FD) 6 and spring latch lever (FD) 7 with the side frames

spread. (Be careful not to spread the frames too much.)

7

4

Frame

6

Frame

3

2

5

Figure 3.3.31 Plate Latch Lever (FD), Spring Latch Lever (FD)

4

1

3 - 38

3.3.32 Belt Cassette Assy

1. Release the lock by drawing the cover knob then open the cover assy side (L).

2. Turn the waste toner box (box toner assy) 1 to the left by pressing it down, then remove it.

3. Draw out the belt cassette assy 2 by lifting it a little bit with its handle.

Cover knob

2

1

Cover assy side (L)

Figure 3.3.32 Belt Cassette Assy

3 - 39

3.3.33 High Voltage Power Supply Unit, Bracket HV (BT) Assy

1. Remove the belt cassette assy. (See 3.3.32)

2. Unscrew 2 screws 1 with the stacker cover opened, then remove the plate HV 2.

3. Unplug the cable 3 and 7 codes 4.

4. Unscrew 2 screws 5 then remove the high voltage power supply unit 6.

5. Remove the bracket HV (BT) assy 7.

1

2

3

4

5

7

5

6

Figure 3.3.33 High Voltage Power Supply Unit, Bracket HV (BT) Assy

3 - 40

3.3.34 Eraser Bracket Assy, Eraser Bracket (KCM) Assy

1. Remove the belt cassette assy. (See 3.3.32.)

2. Open the stacker cover.

3. Remove four screws 5 and then remove the Plate Blind 6.
[Removing the eraser bracket assy]

4. Remove the screw 1 and the connector 2.

5. Release the screw 7 and then remove the eraser bracket assy 3
[Removing the eraser bracket (KCM) assy]

5. Remove the screw 1 and the connector 2.

6. Release the lock of the claw then release the engagement with the bracket sensor T (KCM)

(See 3.3.35 2.)

7. Release the screw 7 and then remove the eraser bracket (KCM) assy 4 and unplug the

cable 2 then remove the eraser bracket (KCM) assy.

1

1

4

2

3

2

5

6

5

7

Figure 3.3.34 Eraser Bracket Assy, Eraser Bracket (KCM) Assy

3 - 41

3.3.35 Shaft Link

1. Remove the eraser bracket assy. (See 3.3.34.)

2. Remove the gear one-way (Z30). (See 3.3.14.)

3. Remove the E-ring 3 by sliding the sensor assy T (KCM) 1 and bracket sensor T (KCM) 2

together in the arrow (A) direction.

4. Release the engagement between the lever Up/Dn and boss A of the lever link (R) 5 by

sliding the spring support (R) 4, lever link (R) 5 and the bearing 6 together in the arrow (B)
direction.
(Keep on sliding until the lever link (R) 5 reaches the end of D-cut part of the shaft link 7.)

5. Draw out the entire shaft link 7 by pressing it in the arrow (C) direction and turning its left side

under the contact (BL L) assy.

6. Detach the sensor assy T (KCM) 1, bracket sensor T (KCM) 2, spring support (R) 4, lever

link (R) 5 and the bearing 6 from the shaft link 7.

7. Remove 2 E-rings 8 then remove the spring support (L) 9 and lever link (L) 0.
[Notice for mounting]

- Engagement between the lever Up/Dn and boss A of the lever link (R) 5:

Mount the spring support (L) 9 and lever link (L) 0 in the predetermined positions, then clamp
the boss A of lever link (R) 5 with the lever Up/Dn by adding rotating power on the spring
support (L) 9 by rotating the shaft link 7.

- Mounting of the spring support (R) 4:

Clamp the spring support (R) 4 at the predetermined positions in the lever link (R) 5 and the
contact BKT (R).

8

0

9

(C)
Slide 7

(D)
Remove 7

(A)
Slide 1, 2

7

1

3

(B)
Slide 4, 5 and 6

2

Boss A

Lever Up/Down

3

Boss A

6

4

5

Figure 3.3.35 Shaft Link

3 - 42

3.3.36 Contact (BL-R) Assy, Contact (CL-R) Assy

1. Remove the gear one-way (Z30). (See 3.3.14)

2. Remove the motor assy BT. (See 3.3.15)

3. Remove the high voltage power supply unit. (See 3.3.33)

4. Remove the shaft link. (See 3.3.35)
[Removal of the contact (BL-R) assy]

5. Unscrew 2 screws 1 and unplug the cable 2, then remove the contact (BL-R) assy 3.
[Removal of the contact (CL-R) assy]

6. Unscrew 2 screws 4 then remove the contact (CL-R) assy 5.

Contact (CL-R) Assy

5

Contact (BL-R) Assy

4

1

3

2

Figure 3.3.36 Contact (BL-R) Assy, Contact (CL-R) Assy

3 - 43

3.3.37 Contact (BL-L) Assy, Contact (CL-L) Assy

1. Remove the shaft link. (See 3.3.35)
[Removal of the contact (BL-L) assy]

2. Unscrew 2 screws 1 then remove the contact (BL-L) assy 2.
[Removal of the contact (CL-L) assy]

3. Unscrew 2 screws 3 then remove the contact (CL-L) assy 4.

Contact (BL-L) Assy

Contact (CL-L) Assy

4

2

3

1

Figure 3.3.37 Contact (BL-L) Assy, Contact (CL-L) Assy

3 - 44

3.3.38 Contact SB Assy

1. Remove the contact (BL-L) assy and contact (CL-L) assy. (See 3.3.37)

2. Unscrew 3 screws 1 then remove the plate blink 2.

3. Unplug 7 codes 3.

4. Unscrew 3 screws 4 then remove the contact SB assy 5.

5

2

1

3

4

3

3

Figure 3.3.38 Contact SB Assy

3 - 45

3.3.39 PXC PCB

1. Remove the contact (BL-R) assy and contact (CL-R) assy. (See 3.3.36)

2. Remove the contact (BL-L) assy and contact (CL-L) assy. (See 3.3.37)

3. Remove the hopping motor. (See 3.3.19)

4. Remove the motor assy BT. (See 3.3.15)

5. Remove the gear heat assy. (See 3.3.12)

6. Remove the roller assy hopping. (See 3.3.25)

7. Remove the holder gear toner assy. (See 3.3.30)

8. Remove the high voltage power supply unit. (See 3.3.33)

9. Unplug the inlet AC. (See 3.3.16)

10. Unscrew 9 screws 1 then remove the guide cassettes (L) 2 and (R) 3 together.

11. Unscrew the screw 4 then remove the switch 5.

12. Unscrew the screw 6 then remove the PXC PCB 7.

1

1

1

1

1

1

7

6

4

3

5

2

Figure 3.3.39 PXC PCB

3 - 46

3.3.40 Heat Unit Assy

1. Open the stacker cover.

2. Release the lock by turning down the lever lock heat guides (blue) on both sides, then lift the

heat unit assy 1 and remove it.

1

Lever Lock Heat Guide

Figure 3.3.40 Heat Unit Assy

3 - 47

3.3.41 Oil Roller Assy

1. Remove the heat unit assy. (See 3.3.40)

2. Release the lock by turning down the lever in the arrow (A) direction, then slide the oil roller

assy 1 with its right side lifted and remove it.

1

(A)

Lever

Figure 3.3.41 Oil Roller Assy

3 - 48

3.3.42 Lever Lock Heat (L)/(R), Guide Side Heat, Spring Lock
Removing methods for right side and left side of each part are the same. Here describes the method

for right side.

1. Remove the heat unit assy. (See 3.3.40)

2. Unscrew 2 screws 1 then remove the guide side heat 2.

3. Remove the E-ring 3 then lever lock heat (R) 4.

(Be careful not to lose the spring lock 5 which slips off together.)

4

5

3

Figure 3.3.42 Lever Lock Heat (L)/(R), Guide Side Heat, Spring Lock

1x2

2

3 - 49

3.3.43 PXL PCB

1. Remove the paper eject assy. (See 3.3.3)

2. Remove the belt cassette assy. (See 3.3.32)

3. Remove the heat unit assy. (See 3.3.40)

4. Unplug the cable 1 and the screw 2, then remove PXL PCB 3.

5. Release the lock of the claw then remove the sensor cover 4.

2

1

4

3

Figure 3.3.43 PXL PCB

3 - 50

3.3.44 Heat Unit Guide Assy

1. Remove the cover assy rear. (See 3.3.1)

2. Remove the paper eject assy. (See 3.3.3)

3. Remove the gear heat assy. (See 3.3.12)

4. Remove the belt cassette assy. (See 3.3.32)

5. Open the stacker cover and remove the heat unit assy. (See 3.3.40)

6. Unscrew 4 screws 1 then remove the heat unit guide assy 2.

1

1

2

Figure 3.3.44 Heat Unit Guide Assy

3 - 51

3.3.45 Holder LED Assy, LED Head

1. Unplug the cable 1.

2. Remove the LED head 3 by spreading the holder LED assy 2 a little bit.

(Be careful not to lose the spring 4 which slips off together.)

3. Remove the holder LED assy 2 by spreading the A-part of the guide holder a little bit with

a flat blade screwdriver.
(Be careful not to lose the spring 5 which slips off together.)

Guide Holder

3

5

A

2

5

4

1

Figure 3.3.45 Holder LED Assy, LED Head

3 - 52

4. ADJUSTMENT

4. ADJUSTMENTS

Adjustments are carried out by key operations on the operator panel, by software operation panel,
and by EEPROM of PU (PXS-PCB) setting.

This page printer supports three maintenance modes. Select and set a maintenance mode fit for
the adjustment.

4.1 Maintenance Modes and Their Functions

4.1.1 User maintenance mode
To set the user maintenance mode, turn on the power switch of the page printer while pressing on

the MENU key.

• Functions

- Menu reset - Hex dump

- Drum counter reset - FUSER COUNT RESET
(YELLOW, MAGENTA, CYAN, BLACK)

- Belt count reset - Operator panel menu disable

- X adjust - Y adjust

- Darkness - DRUM UP/DOWN

- (YELLOW, MAGENTA, CYAN, BLACK)

- Color Reg Adjust Execute

(a) Menu reset

1 Resets all Menu Level 1 settings to the default settings (which have been factory-set).
2 Resets all executable Emulation menu items (including options) to factory-set default

emulation items.

(b) Hex dump

1 Receives data from the host computer and dumps it in a hexadecimal format.
2 When one page of data or more comes from the host, printing automatically starts.

To print out data of less than one page, press the ONLINE key to set the offline state
and press the EJECT key. Printing starts.

3 To exit this mode, shut off power to the page printer.

(This is the only one way to exit this mode.)

(c) Drum counter reset (for yellow, magenta, cyan and black)

1 Used to reset the drum life after the EP drum is replaced.
2 After drum-counter resetting is made, the page printer does not enter the operation

mode automatically.

4 - 1

(d) Fuser count reset

Resets the fuser life after the fuser unit is replaced.

(e) Belt count reset

Resets the belt life after the belt unit is replaced.

(f) Operator panel menu disable

Enables or disables the menu functions (Menu1, Menu2, Tray Type, Power Save, and
Paper Size) of the operator panel.

(g) X adjust

1 Corrects the position of the whole print image so that it may be perpendicular to the

movement of paper (at intervals of 0.25mm).

2 The print image exceeding the specified printable area is clipped.

(h) Y adjust

1 Corrects the position of the whole print image so that it may be parallel to the

movement of paper (at intervals of 0.25mm).

2 The print image exceeding the specified printable area is clipped.

(i) Darkness (Yellow, Magenta, Cyan and Black)

Sets the printout density of each color.

(j) Drum up/down

Moves up or down the image drum (I/D) of each color.

(k) Color Register Adjust Execute

Sets values for correcting X-axis, diagonal, and Y-axis deviations of the LED heads
(yellow, magenta, and cyan) relative to black. The tandem-type page printer OKIPAGE
8c is equipped with an array of image drum (I/D) units which cannot be free from
generation of color deviations. The color deviations are main scanning, sub-scanning,
and diagonal deviations. These mechanically-caused color deviations are corrected
electronically.

4 - 2

User maintenance mode memu system

Category Selection DF After pressing ENTER key After completing the process
MENU MENU MENU
RESET RESETTING RESET
HEX DUMP ON-LINE

HEX DUMP
YELLOW DRMCNT YELLOW DRMCNT YELLOW DRMCNT
RESET RESETTING RESET
MAGENTA DRMCNT MAGENTA DRMCNT MAGENTA DRMCNT
RESET RESETTING RESET
CYAN DRMCNT CYAN DRMCNT CYAN DRMCNT
RESET RESETTING RESET
BLACK DRMCNT BLACK DRMCNT BLACK DRMCNT
RESET RESETTING RESET
FUSER COUNT FUSER COUNT FUSER COUNT
RESET RESETTING RESET
BELT COUNT BELT COUNT BELT COUNT
RESET RESETTING RESET
OP MENU ENABLE * SETTING EEPROM

DISABLE

X ADJUST 0 mm * SETTING EEPROM

+0.25 mm
+0.50 mm

~

+2.00 mm

-2.00 mm

-1.75 mm
~

-0.25 mm

Y ADJUST 0 mm * SETTING EEPROM

+0.25 mm
+0.50 mm

~

+2.00 mm

-2.00 mm

-1.75 mm
~

-0.25 mm

YELLOW DARKNESS 0 * SETTING EEPROM

+1
+2

-2

-1

MAGENTA DARKNESS 0 * SETTING EEPROM

+1
+2

-2

-1

4 - 3

Category Selection DF After pressing ENTER key After completing the process

CYAN DARKNESS 0 * SETTING EEPROM

+1
+2

-2

-1

BLACK DARKNESS 0 * SETTING EEPROM

+1
+2

-2

-1

DRUM UP/DOWN ENABLE * SETTING EEPROM

DISABLE

COLOR REG ADJUST Refer 4.2.2

color deriation

EXECUTE correction

4 - 4