OKI OKIPAGE 8c Plus, OKICOLOR 8 Service manual

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OKIPAGE 8c Plus / OKICOLOR 8 Color LED Page Printer

MAINTENANCE MANUAL

ODA/OEL/INT

1999.8.12 Rev.1

41057601TH Rev.1 1 / 199

Rev.No. Date Corrected items Person in

No. Page Description of change change

1 1999.8.12 ISSUE E4 Yamazaki

41057601TH Rev.1 2 /

PREFACE

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

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

[Notices] The contents of this manual are 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 some 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 OKICOLOR 8 / OKIPAGE 8c Plus in any manner.

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

41057601TH Rev.1 3 /

CONTENTS

1. SPECIFICATIONS ............................................................................................ 7

1.1 Basic System Configuration............................................................................................. 7

1.2 Printer Specifications .......................................................................................................8

1.3 Option Specifications ....................................................................................................... 9

1.4 Basic Specifications....................................................................................................... 10

2. OPERATION................................................................................................... 12

2.1 Main Control Board (PCE PCB)..................................................................................... 13

2.2 Engine Control Board (PX4 PCB) .................................................................................. 16

2.3 Power/Units.................................................................................................................... 17

2.4 Mechanical Processes................................................................................................... 18

2.4.1 Electrophotographic processing mechanism .................................................... 19

2.4.2 Paper running process ..................................................................................... 25

2.5 Sensors.......................................................................................................................... 34

2.5.1 Paper related sensors ...................................................................................... 34

2.5.2 Other sensors ................................................................................................... 35

2.6 Correction of Color Deviation......................................................................................... 36

2.7 Transfer Control according to Environmental Changes

(Room Temperatures and Relative Humidities)............................................................. 36

2.8 Form Jam Detection....................................................................................................... 37

2.9 Cover Opening............................................................................................................... 37

2.10 Toner Low Detection...................................................................................................... 38

2.11 Page Size Detection ...................................................................................................... 39

2.12 Power-on Processing..................................................................................................... 40

2.12.1 Self-diagnostic test ........................................................................................... 40

3. PARTS REPLACEMENT................................................................................41

3.1 Precautions for Parts Replacement ............................................................................... 41

3.2 Parts Layout................................................................................................................... 43

3.3 How to Change Parts..................................................................................................... 47

3.3.1 Cover Assy Rear .............................................................................................. 48

3.3.2 Motor-Fan (80-25) ............................................................................................ 49

3.3.3 Paper Eject Assy .............................................................................................. 50

3.3.4 Cover Assy Stacker, Guide Eject FD Assy....................................................... 51

3.3.5 Frame Assy Upper............................................................................................ 52

3.3.6 Plate Support Assy ........................................................................................... 53

3.3.7 Limiter 2way (L), (R) / Plate Guide (L) , (R) ...................................................... 54

3.3.8 Cover ............................................................................................................... 55

3.3.9 PCB Assy : PCE ............................................................................................... 56

3.3.10 Motor Fan (CU)................................................................................................. 57

3.3.11 PXF PCB/PX4 PCB .......................................................................................... 58

3.3.12 Gear Heat Assy ................................................................................................ 59

3.3.13 Main Motor (A), (B) Assy .................................................................................. 60

3.3.14 Gear One-way (Z30)......................................................................................... 61

3.3.15 Motor Assy BT .................................................................................................. 62

3.3.16 Power Supply Unit, Holder Inlet, Sheet Insulation............................................ 63

3.3.17 Sensor Assy Box Toner .................................................................................... 64

3.3.18 Square-shaped Connector ............................................................................... 65

41057601TH Rev.1 4 /

3.3.19 Hopping Motor .................................................................................................. 66

3.3.20 Gear One-way .................................................................................................. 67

3.3.21 Feeder Unit Front ............................................................................................. 68

3.3.22 Manual Feed Hopper Assy ............................................................................... 69

3.3.23 Guide Paper Input Assy.................................................................................... 70

3.3.24 Two Lever Input Sensors, Lever 2nd Feed Sensor .......................................... 71

3.3.25 Roller Registration, Roller Assy Hopping ......................................................... 72

3.3.26 Roller Hopping.................................................................................................. 73

3.3.27 PXU PCB/PXM PCB, Lever Resist Sensor ...................................................... 74

3.3.28 Paper End Lever............................................................................................... 75

3.3.29 PCO PCB (Operator Panel).............................................................................. 76

3.3.30 Holder Gear Toner Assy................................................................................... 77

3.3.31 Plate Latch Lever (FD), Spring Latch Lever (FD) ............................................. 78

3.3.32 Belt Cassette Assy ........................................................................................... 79

3.3.33 High Voltage Power Supply Unit, Bracket HV (BT) Assy ................................. 80

3.3.34 Eraser Bracket Assy, Eraser Bracket (KCM) Assy ........................................... 81

3.3.35 Shaft Link.......................................................................................................... 82

3.3.36 Contact (BL-R) Assy, Contact (CL-R) Assy ...................................................... 83

3.3.37 Contact (BL-L) Assy, Contact (CL-L) Assy ....................................................... 84

3.3.38 Contact SB Assy............................................................................................... 85

3.3.39 PXC PCB .......................................................................................................... 86

3.3.40 Heat Unit Assy.................................................................................................. 87

3.3.41 Oil Roller Assy .................................................................................................. 88

3.3.42 Lever Lock Heat (L)/(R), Guide Side Heat, Spring Lock................................... 89

3.3.43 PXL PCB .......................................................................................................... 90

3.3.44 Heat Unit Guide Assy ....................................................................................... 91

3.3.45 Holder LED Assy, LED Head............................................................................ 92

4. ADJUSTMENTS ............................................................................................. 93

4.1 Maintenance Modes and Their Functions...................................................................... 93

4.1.1 User maintenance mode .................................................................................. 93

4.1.2 System maintenance mode .............................................................................. 95

4.1.3 Engine maintenance mode ............................................................................... 97

4.2 Adjustments after Parts Replacement ......................................................................... 100

4.2.1 Confirm the LED head driving time................................................................. 100

4.2.2 Color deviation correction............................................................................... 102

5. PERIODIC MAINTENANCE ......................................................................... 105

5.1 Periodically Replaced Parts ......................................................................................... 105

5.2 Cleaning....................................................................................................................... 105

5.3 Cleaning the LED Lens Array ...................................................................................... 105

5.4 Cleaning the Pickup Roller........................................................................................... 105

6. TROUBLESHOOTING PROCEDURES ....................................................... 106

6.1 Troubleshooting Tips ................................................................................................... 106

6.2 Points to Check before Correcting Image Problems.................................................... 106

6.3 Tips for Correcting Image Problems ............................................................................ 106

6.4 Preparation for Troubleshooting .................................................................................. 107

6.5 Troubleshooting Flow................................................................................................... 107

6.5.1 LCD status message/trouble list..................................................................... 107

6.5.2 LCD message troubleshooting ....................................................................... 116

6.5.3 Image troubleshooting .................................................................................... 129

41057601TH Rev.1 5 /

7. WIRING DIAGRAM...................................................................................... 146

7.1 Resistance Check ........................................................................................................ 146

7.2 Program/Font ROM Location ....................................................................................... 150

8. Parts List...................................................................................................... 154

Appendix A CENTRONICS PARALLEL INTERFACE.................................... 175

Appendix B HIGH CAPACITY SECOND PAPER FEEDER ........................... 179

1. OUTLINE ......................................................................................................179

1.1 Functions ..................................................................................................................... 179

1.2 External View and Component Names........................................................................ 179

2. MECHANISM DESCRIPTION ...................................................................... 180

2.1 General Mechanicsm................................................................................................... 180

2.2 Hopper Mechanism...................................................................................................... 181

3. PARTS REPLACEMENT..............................................................................182

3.1 Precautions Concerning Parts Replacement............................................................... 182

3.2 Parts Layout................................................................................................................. 184

3.3 Parts Replacement Methods........................................................................................ 185

3.3.1 Idle rollers ....................................................................................................... 186

3.3.2 AOLT-PCB...................................................................................................... 187

3.3.3 Hopping motor ................................................................................................ 188

3.3.4 Feed roller ...................................................................................................... 189

3.3.5 Hopping roller ................................................................................................. 190

3.3.6 Side frame (L) assy ........................................................................................ 191

3.3.7 Side frame (R) assy........................................................................................ 192

4. TROUBLESHOOTING.................................................................................. 193

4.1 Precautions Prior to the Troubleshooting..................................................................... 193

4.2 Preparations for the Troubleshooting........................................................................... 193

4.3 Troubleshooting Method .............................................................................................. 194

4.3.1 LCD Status Message List ............................................................................... 194

4.3.2 Troubleshooting Flow ..................................................................................... 195

5. CONNECTION DIAGRAM............................................................................ 196

5.1 Interconnection Diagram.............................................................................................. 196

5.2 PCB Layout.................................................................................................................. 197

6. PARTS LIST ................................................................................................. 198

41057601TH Rev.1 6 /

M M

LED head

Discharging indicators

Centronics

interface

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

interface

SIMM

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 OKICOLOR 8 / OKIPAGE 8c Plus is illustrated in Figure 1.1.

Figure 1.1

41057601TH Rev.1 7/

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

I/F Cover Assy

Rear Cover

Side Cover (L) Assy

Base Unit

Figure 1.2

Operator Panel Assy

41057601TH Rev.1 8/

1.3 Option Specifications

Options available for OKICOLOR 8 / OKIPAGE 8c Plus 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.

41057601TH Rev.1 9/

1.4 Basic Specifications

(1) Dimensions

Width: 18.8" (478mm) Length: 24.5" (622mm) Height: 15.6" (396mm)

(2) Weight

Approx. 48kg (106lbs)

(3) Form

Type: Ordinary paper (Hammermill 24lbs) and OHP (Only CG3710)

Recommended paper (for color printing) Color laser paper (20lb to 24lbs) Note: The printout color tones are dependent upon the whiteness of the print

paper Sizes: Letter, Legal (13"or 14"), Executive, A4, A5, B5, and A6 (1st tray and front feeder) Reams: 1st tray 20lbs to 28lbs

2nd tray 20lbs to 28lbs

Front feeder 20lbs to 44lbs

(5) Printing speed

8 pages per minute (5 pages per minute: OHP/ 34lbs ~44lbs, 123g/m2~166g/m2)

(6) Resolution

600 dots per inch x 600 dots per inch

(7) Input voltage

120VAC +5.5%, -15% 230VAC ±10%

(8) Power consumption

Peak W Typical operation W Idle W Power-save mode W

(9) Frequency

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

(10) Noises

Operating: 54dB (without 2nd tray), 55dB (with 2nd tray) Standby: 45dB Power-saving: 43dB

(11) Expendibles and service life

Toner cartridge: Approx. 1800 pages (5% duty) (each of Y, M, C, and K)

(Approx. 1000 sheets for the first) Image drum: Up to 12,000 pages (5% duty, continuous) (each of Y, M, C, and K) Waste Toner Box: Up to 25,000 Sheets

(under typical printout conditions: Single images of 5% density,

equivalent to printout using 14 toner cartridges) Oil Roller Unit: Up to 10,000 sheets (Life defined in the number of actually printed

paper sheets)

(12) Periodically-replaced parts

Heat Unit Assy: 60,000 pages Belt Cassette Assy: 50,000 pages

41057601TH Rev.1 10/

(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 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 50

26.8 35 40

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

Power off with drum and toner without drum and toner and Belt Cassette Assy 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

41057601TH Rev.1 11/

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'

JST3P

FAN 1

FAN 2

Oil PAD MSW

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

MCKID

12P

HETBELT

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

PCE

Operator

panel

PCO

board

PU 40P

72PX2

PS SIMM

72PX4

D-RAM SIMM

64P

OKI HSP

36P

Parallel

CUIF 40P

POWER 30P

THE.RM 6P

RSENS 7P

Interlock switch

UPDOWN

12P

OKICOLOR 8 / OKIPAGE 8c Plus is a tandem color electrophotographic page printer, using 4992LED technologies , OPC, dry single-component non-magnetic developing, roller transfer, heatcompression fixing and so on. The printing method used is a Black Writing method which applies light beams to printout areas.

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

41057601TH Rev.1 12/

Figure 2.1

2.1 Main Control Board (PCE PCB)

The control board consists of a CPU (µPD30500S2-200) 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 (PCE PCB).

MPU Memory controller ROM, Flash Max 32M

SysAD

SysCmd

Control

NMI

INTO

PD30500

S2-200

ExtReg

INT1

Reset

ColdReset

VCCOK

ModeIn

ModeClock

MasterClock

2nd cache controller

SysAD

SysCmd

Control

9 5

1 1

9 5 1 1

1 1 1 1

SysAD SysCmd Control

uPD94704

NMI

S1-001-F6

INT

CLK RST

Interface controller SysAD SysCmd Control ExtReq INT

ColdReset VCCOK ModeIn ModeClk

uPU66044 GN-014-LMU

A D

Control

A D

Control

WDATA FSYNC

Control

PU I/F OP I/F

EEPD EEPCLK EEPCS0

PCO

PCI

22 64

11 64 25

8 4 4

9 4

1 1 1

8 5

D-RAM Max 144M

74LVC161284 Bi-Centro

WDATA ESYNC Control

Operator panel

DI CLK DO CS

Engine

EE-PROM

2nd cache

Control

Reset circuit

SysAD

OSC

DIP SW

Reset

CLK

RSTIN

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

OKI HSP

Host I/F(Not installed)

Figure 2.2

41057601TH Rev.1 13/

(1) CPU

The CPU is a 64-bit RISC architecture processor (provided by NEC). It inputs a frequency of 50MHz and runs at 200MHz. It transfers data to and from memory at 50MHz.

(2) OTP ROM

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

(3) DRAM

The DRAM block consists of eight 16Mbit (1M x 16bits) chips and its total size is 16M bytes. The chips are mounted on the PCE-PCB and can be expanded up to 144M bytes by adding the 32M byte SIMMs to the SIMM slots on the PCE-PCB.

(4) EEPROM

The EEPROM block consists of 16K-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 its total size is 2M bytes. The chips are mounted on the PCE-PCB and are used for storing fonts, macro and demo pages.

(6) Memory control LSI

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

(7) Interface control LSI

This block mainly consists of 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

• 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 as not to cause interface time-out at the host side.

(a) Centronics bidirectional parallel interface

This is an interface conforming to IEEE-1284 and provides either 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 transfers 4-bit wide data from the printer to the host. In this mode, each bit of 1-byte data is transmits in the form of two nibbles using ERROR, BUSY, FAULT, and SELECT signal leads. This mode can provide bidirectional operation in combination with the compatibility mode.

41057601TH Rev.1 14/

• ECP mode This mode provides the asynchronous bidirectional interface and transmits and receives 1-byte data using eight data signal leads under 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) 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 HSP interface is shown in Fig. 2-3.

Printer

Network, etc.

Control board

LAN

expansion board

HSP

interface

Figure 2.3

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

(9) 2nd Cache and 2nd Cache Controller

This printer has 2nd Cache unit which type is Write Through Cache and size is 512 KByte. Thereare any difference between the instruction and data. All of the CPU read/ write accesses are cached to same 2nd Cache memory.

(10) RAM module

• Pin layout

1363772

• Basic specificaton

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

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

- Capacity: 4, 8, 16 or 32MB

- Parity: None

41057601TH Rev.1 15/

2.2 Engine Control Board (PX4 PCB)

NM93C66N-NW

CPU BUS

VIDEO I/F

(Heater temperatures and envirnment humidity and temperature)

EEPROM

VIDEO MEM

HM658512

OSC 28MHz

RESET

ANALOG INPUT

CPU

MSM65524

(containing AD converter)

INT

LSI

MB87D

113PFV

MT DRIVER

MTD2005F

MT DRIVER

MTD2005F

MT DRIVER

MTD2005F

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)

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 the 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.

41057601TH Rev.1 16/

(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/Units

The power supply unit comprises of the low voltage power supply unit which consists of an AC filter circuit, low voltage power supply circuit and heater driver circuit, and the high voltage power supply unit.

(1) Low voltage power supply unit

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, discharge lamp +12 V HSP, OP Amp, high voltage power supply –12 V HSP

(2) High voltage power supply unit

This circuit generates the following voltages necessary for electro-photographic processing from +32 V in accordance with 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 highvoltage 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 : -250V/+300V, -232V/+300V(First paper. Y only) K : -275V/+300V Transparency

Y. M. C. : -200V/+300V, K. : -250V/+300V SB Y. M. C.K : -650V/0V Voltage applied to toner supply roller TR 0 to 4 KV Voltage applied to transfer roller Variable FIX 0 to 2.5 KV Voltage applied to transfer roller Variable

41057601TH Rev.1 17/

2.4 Mechanical Processes

Paper

ejection

roller

Paper

ejection

(Face down)

Power

supply

Charging

roller

Cleaning

blade

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 OKICOLOR 8/ OKIPAGE 8c Plus.

41057601TH Rev.1 18/

Figure 2.5

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 negative 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.

41057601TH Rev.1 19/

(2) Paper pickup

Pickup roller

Paper (medium)

Conveying belt

Driven roller

Power

supply

A DC voltage (0V to 2KV) is applied to the driven roller A to positive 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.

41057601TH Rev.1 20/

(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

41057601TH Rev.1 21/

(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.

41057601TH Rev.1 22/

(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

Conveying belt

Paper

Transfer roller

Power

supply unit

41057601TH Rev.1 23/

(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

Backup roller

Heat roller

Thermistor

(8) Cleaning

The toner which remains on the OPC Drum without being fused is scraped by a cleaning blade and discarded in the waste toner tank.

OPC drum

Cleaning blade

Transfer roller

41057601TH Rev.1 24/

2.4.2 Paper running process

face down stacker

oil roller

fuser

low-voltage power supply

AC switch

transfer roller

4 light rejector

transfer belt unit

ID unit up / down actuater

belt cleaning

high voltage power supply

pick up 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 OKICOLOR 8/ OKIPAGE 8c Plus.

Figure 2.6 Paper Route

41057601TH Rev.1 25/

(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

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.

41057601TH Rev.1 26/

(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

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

Resist roller 2

Paper

First hopping roller

One-way gear A

41057601TH Rev.1 27/

(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

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.

41057601TH Rev.1 28/

(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

One-way clutch gear B

Idle gear A

Hopping roller

One-way clutch gear A

Idle gear B

Paper from the tray

Entrance sensor 2

Cam

Sensor

Pickup roller

Form sensor

Pinch roller 2

Resist roller 2

41057601TH Rev.1 29/

(b) Front feeder hopping

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

Idle gear A

Hopping roller

One-way clutch gear A

Paper from front feeder

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.)

One-way clutch gear B

Cam

Sensor

Pickup roller 2

Form sensor

Idle gear B

Entrance sensor 2

Resist roller 2

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.

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

because of the one-way clutch.

Paper

Form sensor

Resist roller 2

One-way gear A First hopping roller

41057601TH Rev.1 30/

(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.

Up/down gear

Z53/44

Z25/75

CCW

Pulse motor

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.

41057601TH Rev.1 31/

I/D unit up/down actuator

Up/down lever

I/D unit

Figure 2.6-b

I/D unit

Figure 2.6-c

41057601TH Rev.1 32/

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

Ejection roller

Oil cleaning roller

Face-down stacker

Oil roller

Hear roller

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

41057601TH Rev.1 33/

2.5 Sensors

2.5.1 Paper related sensors

Ejection roller

Heat roller

Exit sensor

Backup roller

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

Write sensor

Ejection sensor

K drum C drumM drumY drum

Driving roller

Driven rollers

Belt cleaning blade

Function Detects the front edge of an incoming paper 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 elapsed time 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

Write sensor

Pickup roller

Pinch roller 2

Resist roller 2

FF sensor 2

First hopping roller

Second hopping roller

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

FF sensor 1

Auxiliary rollers

41057601TH Rev.1 34/

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 “waste toner full” message.

6 Resist up/down sensor

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

7 Temperature sensor

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

8 Humidity sensor

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

41057601TH Rev.1 35/

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 mechanically caused 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 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.

41057601TH Rev.1 36/

2.8 Form Jam Detection

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

Error

Form feed jam Convey jam Ejection jam Form size error

Three hopping operations are made, but the Form Feed sensor (Entrance) does not turn on a preset time after the Form Feed sensor 1 turns on. The ejection sensor 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 OKICOLOR 8/ OKIPAGE 8c Plus 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 process.

PX4-PCB

CPU

65524

+32V

Conditions

Upper cover

microswitch

Side cover

microswitch

Front cover microswitch

P4.7

COVOPN (2P)

High-voltage power supply board

HVOLT (16P)

detect circuit

High-voltage power supply unit

41057601TH Rev.1 37/

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 engagement of concave 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

Concave

Sensor Lever

Stirring Bar

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.

41057601TH Rev.1 38/

Sensor Lever

TONER FULL state

TNRSNS

1.965 SEC.

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

TONER LOW state

TNRSNS

1.965 SEC.

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

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

• When the toner full state is detected for 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

41057601TH Rev.1 39/

2.12 Power-on Processing

2.12.1 Self-diagnostic test (1) Initial test

The following checks are automatically performed when the OKICOLOR 8 / OKIPAGE 8c Plus 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 the 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 ofFlash 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.

41057601TH Rev.1 40/

3. PARTS REPLACEMENT

The section explains the procedures for replacement of parts, assemblies, 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.

41057601TH Rev.1 41/

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

Table 3-1 Service Tools

No.

7 1

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

Tweezers

Q' ty Place of use RemarksService Tools

2~2.5 mm screws

3~5 mm screws

Cleans LED head

41057601TH Rev.1 42/

3.2 Parts Layout

Figure 3-1

41057601TH Rev.1 43/

Figure 3-2

41057601TH Rev.1 44/

Figure 3-3

41057601TH Rev.1 45/

Figure 3-4

41057601TH Rev.1 46/

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 : PCE (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.

41057601TH Rev.1 47/

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

41057601TH Rev.1 48/

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.

Figure 3.3.2 Motor-Fan (80-25)

41057601TH Rev.1 49/

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.

claw

Figure 3.3.3 Paper Eject Assy

1x2

41057601TH Rev.1 50/

3.3.4 Cover Assy Stacker, Guide Eject FD Assy Remove the belt cassette assy and the heat unit 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 5.

2x6

4x4

2x2

Cable

Figure 3.3.4 Cover Assy Stacker, Guide Eject FD Assy

41057601TH Rev.1 51/

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 9.

8x2

4x4

8x2

Cable

Figure 3.3.5 Frame Assy Upper

41057601TH Rev.1 52/

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.)

Cable

Figure 3.3.6 Plate Support Assy

41057601TH Rev.1 53/

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.

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

41057601TH Rev.1 54/

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).

Remove the belt cassette assy and the heat unit assy.

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. Pull off the film E glued on the cassette guide.

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).

Pushed Up

FDR Unit Front

Figure 3.3.8 Cover

41057601TH Rev.1 55/

3.3.9 PCB Assy : PCE Remove the belt cassette assy and the heat unit assy.

1. Open the top cover.

2. Unscrew 2 screws 1 to 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 8 to remove the plate shieled (CU) 9.

4. Unscrew 3 screws 3 to remove the plate shield 4.

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

6. Unscrew 8 screws 6 to remove the PCB assy : PCE 7.

Figure 3.3.9 PCB Assy : PCR

41057601TH Rev.1 56/

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, 2 collars 4 and then remove the motor fan

(CU) 3.

Figure 3.3.10 Motor Fan (CU)

41057601TH Rev.1 57/

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

at the same time.

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

2. Unscrew 5 screws 1 then remove the cover CU2.

3. Unplug all the cables 5 connected to the PXF PCB 3 and PX4 PCB 4.

4. Unscrew 5 screws 6 then remove the PXF PCB3 and PX4 PCB4 at the same time.

Figure 3.3.11 PXF PCB/PXS PCB

41057601TH Rev.1 58/

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 PX4 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.

Figure 3.3.12 Gear Heat Assy

41057601TH Rev.1 59/

3.3.13 Main Motor (A), (B) Assy

1. Remove the PXF PCB and PX4 PCB. (See 3.3.11)

2. Unscrew 4 screws 8 and remove 4 plate-Earth 9 and 4 lever Up/Dn 2 1.

3. Unplug all the cables 2 connected and unscrew 4 screws 3, then remove the main motor

(A) assy 4.

4. Unplug all the cables 5 connected and unscrew 3 screws 6, then remove the main motor

(B) assy 7.

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

41057601TH Rev.1 60/

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 requires adjustment.

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

2. Remove the cover CU. (See 3.3.11)

3. Remove the 4 Plate-Earth and 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)

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

Shaft link

Figure 3.3.14 Gear One-way (Z30)

Claw

41057601TH Rev.1 61/

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

41057601TH Rev.1 62/

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 3 screws 6, then unplug the cable 8.

Figure 3.3.16 Power Supply Unit, Holder Inlet, Sheet Insulation

41057601TH Rev.1 63/

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

Figure 3.3.17 Sensor Assy Box Toner

41057601TH Rev.1 64/

3.3.18 Square-shaped Connector Remove the heat unit assy.

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. Remove cable 2, screw 5 bracket 6 and cable 7 in order and then take off SW from bracket

6 to pull off square-shaped connector 4.

Figure 3.3.18 Square-shaped Connector

41057601TH Rev.1 65/

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.

Figure 3.3.19 Hopping Motor

41057601TH Rev.1 66/

3.3.20 Gear One-way

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

2. Remove the spacer 4 first and 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.

Figure 3.3.20 Gear One-way

Claw

41057601TH Rev.1 67/

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. Unscrew the screw 8 and remove the cable 9.

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

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

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

PXF

PX4

Figure 3.3.21 Feeder Unit Front

41057601TH Rev.1 68/

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

41057601TH Rev.1 69/

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

Figure 3.3.23 Guide Paper Input Assy

41057601TH Rev.1 70/

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.

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

41057601TH Rev.1 71/

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. Remove E-rings 9 of the sub-roller hopping at both sides of hopping roller and then 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.)

Figure 3.3.25 Roller Registration, Roller Assy Hopping

41057601TH Rev.1 72/

3.3.26 Roller Hopping

1. Remove the roller assy hopping. (See 3.3.25) and remove the 2 sub-roller hopping guide 3 .

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

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

Knock-pin

Claw

Figure 3.3.26 Roller Hopping

41057601TH Rev.1 73/

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.

PXU PCB

Figure 3.3.27 PXU PCB/PXM PCB, Lever Resist Sensor

PXM PCB

41057601TH Rev.1 74/

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

41057601TH Rev.1 75/

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)

Figure 3.3.29 PCO PCB (Operator Panel)

41057601TH Rev.1 76/

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.

Figure 3.3.30 Holder Gear Toner Assy

41057601TH Rev.1 77/

3.3.31 Plate Latch Lever (FD), Spring Latch Lever (FD) Remove the belt cassette assy.

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

5. Unscrew 2 screws 2 then remove the bracket SW (side) 3.

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.)

Frame

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

41057601TH Rev.1 78/

3.3.32 Belt Cassette Assy

1. Open the Top cover.

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

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

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

Cover knob

Cover assy side (L)

Figure 3.3.32 Belt Cassette Assy

41057601TH Rev.1 79/

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.

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

41057601TH Rev.1 80/

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.

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

41057601TH Rev.1 81/

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. When removing shaft (K) assy, remove 3 screws then remove the Heat Sink-801 B. Release the lock of the claw then remove the plate shield Heat C by sliding .

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).

(D) Remove 7

(A) Slide 1, 2

(B) Slide 4, 5 and 6

Boss A

Lever Up/Down

Boss A

Stay EP

Figure 3.3.35 Shaft Link

41057601TH Rev.1 82/

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

Contact (BL-R) Assy

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

41057601TH Rev.1 83/

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

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

41057601TH Rev.1 84/

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.

Figure 3.3.38 Contact SB Assy

41057601TH Rev.1 85/

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.

Figure 3.3.39 PXC PCB

41057601TH Rev.1 86/

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.

Lever Lock Heat Guide

Figure 3.3.40 Heat Unit Assy

41057601TH Rev.1 87/

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.

(A)

Lever

Figure 3.3.41 Oil Roller Assy

41057601TH Rev.1 88/

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.)

1x2

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

41057601TH Rev.1 89/

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.

Figure 3.3.43 PXL PCB

41057601TH Rev.1 90/

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.

Figure 3.3.44 Heat Unit Guide Assy

41057601TH Rev.1 91/

3.3.45 Holder LED Assy, LED Head Remove the belt cassette assy and the heat unit assy.

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

Figure 3.3.45 Holder LED Assy, LED Head

41057601TH Rev.1 92/

4. ADJUSTMENTS

Adjustments are carried out by key operations on the operator panel, by software operation panel, and by EEPROM of PU (PX4-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

- Resource save area - Receive buffer size

- Operator panel menu disable - X adjust

- Y adjust (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.)

Sets the resource saving area. This menu item appears when the option PS SIMM and RAM increases, the selectable size will also increase (When adding a RAM over 24Mbytes, the selection can be made up to 22.5Mbytes). The size upon auto will also increase if the size of the add-on RAM increases.

(d) Receive buffer

Sets the receive buffer. The data transmission time from the upper command will decrease when set to a high value, but memory overflow will occur easier. Memory will be restructured with this change, and the contents of all download fonts, PCL macro, and PodtScript will be lost.

(e) Operator panel menu disable

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

(f) 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.

(g) 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.

41057601TH Rev.1 93/

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

RESOURCE SAVE AUTO *

OFF 400KB 900KB

1.6MB

2.5MB

•

19.6MB

22.5MB

RECEIVE BUFFER AUTO *

OFF 100KB 512KB 1MB

ECP ENABLE *

DISABLE

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

41057601TH Rev.1 94/

4.1.2 System maintenance mode To set the system maintenance mode, turn on the power switch of the page printer while pressing

on the Recover key. Note: The system maintenance mode is hidden and not available to the user. To exit this mode, press the ONLINE switch except during rolling ASCII continuous printing. Then

the RUN mode is set. In the system maintenance mode, the category changes each time the MENU switch is pressed. The last category wraps around to the first category. The system maintenance mode supports the following functions:

• Page count display • Page count printing enable/disable

• Rolling ASCII continus prinitng • EEPROM reset

• HSP ERROR recovery • HSP ERROR count display

• HSP ERROR count reset (1) Page count display

• The total number of pages counted at the engine is displayed on the LCD.

(2) Page count printing enable/disable

• This function selects whether to include (enable) or exclude (disable) the total number of printed pages counted at the engine at the time of menu printing.

(3) Rolling ASCII continuous printing

• The rolling ASCII pattern is printed continuously for various engine tests.

• Press the ON-LINE key to cancel this mode.

(4) EEPROM reset

• All EEPROM areas including Menu level-2 to the factory default values.

• The following items are excluded Head drive time setting

ENGINE Maintenance Item Revision (Including Destination setting)

(5) HSP ERROR recovery

• Select HSP ERROR recovery function either recover or stop.

(6) HSP ERROR count

• Display total HSP ERROR count.

(7) HSP ERROR count reset

• Reset the HSP ERROR counter.

41057601TH Rev.1 95/

System Maintenance mode menu system

Category Selection DF After pressing ENTER key After completing the process PAGE CNT nnnnnn PAGE PRT DISABLE *

ENABLE

CONT PRT CONT PRT CONT PRT

PRINTING CANCELLED

(ON LINE SW Press) EEPROM EEPROM EEPROM RESET RESETTING RESET HSPERR RECOVER * SETTING

STOP EEPROM HSPERR CNT nn HSPERR HSPERR HSPERR CNT RST RESETTING CNT RST

41057601TH Rev.1 96/

4.1.3 Engine maintenance mode To set the engine maintenance mode, turn on the power switch of

the page printer while pressing on the ENTER and FORM FEED keys. The engine maintenance mode is set and “ENG MNT” is displayed on-screen.

Note: The engine maintenance mode is hidden and not available to the user. To exit this mode, press the ONLINE switch. The operation mode is set. The engine maintenance

mode supports the following functions:

• Head drive time setting (YELLOW, MAGENTA, CYAN, BLACK)

• Drum count display (YELLOW, MAGENTA, CYAN, BLACK)

• Total drum count display (YELLOW, MAGENTA, CYAN, BLACK)

• Fuser count display

• Belt count display

• Oil roller count display

• Setting of standard tray paper feed length

• Setting of second tray paper feed length

• Setting of frontfeeder paper feed length

• Engine reset

(1) Head drive time setting (Yellow, Magenta, Cyan, and Black)

Sets the time of driving each LED head.

(2) Drum count display (Yellow, Magenta, Cyan, and Black)

Displays the number of revolutions of each EP drum counted by the engine on the LCD.

(3) Total drum count display (Yellow, Magenta, Cyan, Black)

Displays the total number of rotations at each color.

(4) Fuser count display

Displays the total number of pages by Fuser which have been counted by the engine.

(5) Belt count display

Displays the total number of pages by Belt which have been counted by the engine.

(6) Oil roller count display

Displays the counter of the oil roller.

(7) T1 position (Setting of standard tray paper feed length)

Sets a value for correcting the amount of paper feeding of the standard tray.

(8) T2 position (Setting of second tray paper feed length)

Sets a value for correcting the amount of paper feeding of the second tray.

(9) Engine reset

- Resets the contents of all EEPROM areas used by the engine with default values.

- Does not reset the following items: LED head drive time Menu level 1 Menu level 2 Operator Panel Menu Disable/Enable Page Print Disable/Enable

41057601TH Rev.1 97/

Engine maintenance mode memu system (1/2)

Category Selection DF After pressing ENTER key After completing the process

YELLOW LED HEAD No.1 SETTING EEPROM

No.2

No.16 No.17

No.32

MAGENTA LED HEAD No.1 SETTING EEPROM

No.2

No.16 No.17

No.32

CYAN LED HEAD No.1 SETTING EEPROM

No.2

No.16 No.17

No.32

BLACK LED HEAD No.1 SETTING EEPROM

No.2

No.16 No.17

No.32

41057601TH Rev.1 98/

Engine maintenance mode menu system (2/2)

Category Selection DF After pressing ENTER key After completing the process YELLOW DRMCNT nnnn Yellow DRMCNT T nnnnnnn MAGENTA DRMCNT nnnn Magenta DRMCNT T nnnnnnn CYAN DRMCNT nnnn Cyan DRMCNT T nnnnnnn BLACK DRMCNT nnnn Black DRMCNT T nnnnnnn FUSER COUNT nnnn BELT COUNT nnnn Oil Roller Count nnnnnnn T1 POSITION 0 mm * SETTING EEPROM

+1 mm

+7 mm

-8 mm ~

-1 mm

T2 POSITION 0 mm * SETTING EEPROM

+1 mm

+7 mm

-8 mm ~

-1 mm

FF POSITION 0 mm * SETTING EEPROM

+1 mm

+7 mm

-8 mm ~

-1 mm

ENGINE ENGINE ENGINE RESET RESETTING RESET

41057601TH Rev.1 99/

4.2 Adjustments after Parts Replacement

Adjustments required after parts replacement are listed below. Adjustment and correction of color deviations are always required after parts are replaced.

Part replaced Adjustment required LED head Correct color deviations. Drum cartridge (Y, M, C, B, and K) Reset the drum counter and correct color deviations. Fuser Unit Reset the fuser counter and correct™™ color deviations. Belt cassette assembly Reset the belt counter and correct color deviations. EEPROM (PU block) Correct color deviations. Oil Roller Reset the oil roller counter. Other parts Correct color deviations (if any).

4.2.1 Confirm the LED head driving time Note: The OKICOLOR 8/ OKIPAGE 8c Plus, if a new LED HEAD is placed, reads the contents

of EEPROM within the LED HEAD, automatically re-setting the drive time. Therefore, the re-setting of drive time is unnecessary, but a confirmation to the drive time re-set is necessary.

- Display of illumination level of the LED head

405473

03234*********078TH

The trailing three digits of this number

indicates the illumination level of the LED head.

41057601TH Rev.1 100/

OKI OKIPAGE 8c Plus, OKICOLOR 8 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual