Okidata C7000 Service Manual

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Page 1

C7000 Series

Color LED Page Printer

SERVICE MANUAL

OkiData

01-23-2001 based on Rev.4

41316401TH Rev.4A 1 / 186

Page 2

Document Revision History

Rev.No. Date

2000-05-29 ISSUE E4 Yamazaki

No.

Corrected items

Page Description of change

Person in

charge

2 2000-05-31 E4 Murakami 3 2000-12-04 NIP9 Yamazaki 4 2000-12-15 NIP9 Yamazaki

41316401TH Rev.4 2 /

Page 3

PREFACE

This manual describes the procedures for the maintenance of the C7000 Series of printers. The document is produced for maintenance personnel use. For details on the procedures for handling the

C7000 Series of printers, see its user documentation.

Note!

• The descriptions in this manual are subject to change without prior notice.

• In preparing the document, efforts have been made to ensure that the information in it is accurate. However, there may be errors in the document. Oki Data assumes no responsibility for any damage resulting from, or claimed to be the results of, those repairs, adjustments or modifications to the printers which are made by users using the manual.

• The parts used for the printers are electrostatic sensitive and, if handled improperly, may be damaged. It is strongly recommended that the products be maintained by Oki Data Authorized Repair Centers

Oki Data.

41316401TH Rev.4 3 /

Page 4

1. CONFIGURATIONS ......................................................................................... 7

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

1.2 Printer Configuration ........................................................................................................8

1.3 Option Configuration ........................................................................................................ 9

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

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

2.1 Main Board (CRM PWB)................................................................................................ 13

2.2 Engine Controller Board (K71 PWB).............................................................................. 15

2.3 Power Units.................................................................................................................... 16

2.4 Mechanical Processes .................................................................................................. 17

2.4.1 Electrophotographic process............................................................................ 18

2.4.2 Paper running process ..................................................................................... 23

2.5 Sensor............................................................................................................................ 31

2.5.1 Paper related sensors ...................................................................................... 31

2.5.2 Other sensors................................................................................................... 32

2.6 Color Misalignment Correction....................................................................................... 33

2.7 Transfer Control Responds to Environmental Changes

(Room Temperatures and Relative Humidities)............................................................. 33

2.8 Paper Jam Detection ..................................................................................................... 34

2.9 Cover-Open ...................................................................................................................35

2.10 Toner Low Detection...................................................................................................... 36

2.11 Page Size Detection ...................................................................................................... 37

2.12 Operation at Power-on................................................................................................... 38

2.12.1 Self-diagnostic test........................................................................................... 38

2.13 Color Misalignment Detection ........................................................................................ 39

2.14 Version Read of Units Replaced Periodically ................................................................ 40

2.15 Life Count for Units Replaced Periodically..................................................................... 40

2.16 Toner Consumption Detection ...................................................................................... 40

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

3.1 Precautions in Replacing Parts...................................................................................... 41

3.2 Parts layout .................................................................................................................... 43

3.3 Replacing Parts..............................................................................................................49

3.3.1 Top Cover......................................................................................................... 51

3.3.2 LED Assy/ LED Assy Spring............................................................................. 52

3.3.3 Top Cover Unit ................................................................................................. 53

3.3.4 Control Panel Assy/ Control Panel Bezel/ LED Control PWB/ Toner Sensors/

Stacker Full Sensor/ Control Panel/ Control Panel Tape Harness/ Eject Rollers. 54

3.3.5 Top Cover Handle/ Top Cover Latch/ Top Cover Latch Spring........................ 55

3.3.6 Eject Guide Assy .............................................................................................. 56

3.3.7 Cassette Assy/ Front Cover Assy/ Front Cover Inner Baffle ........................... 57

3.3.8 Retard Pad Assy/ Retard Pad Assy Spring ...................................................... 58

3.3.9 Feed Roller and Nudger Roller......................................................................... 59

3.3.10 Rear Cover....................................................................................................... 60

3.3.11 Face-Up Tray.................................................................................................... 61

3.3.12 Left Side Cover................................................................................................. 62

3.3.13 Right Side Cover .............................................................................................. 63

3.3.14 Multipurpose Tray Assy/ Multipurpose Tray Cover Assy/ Links/

Multipurpose Tray Top Cover/ Multipurpose Tray Drive Gear.......................... 64

3.3.15 Drum Contact Assys .......................................................................................... 65

3.3.16 Registration Roller Assy (A)/ Registration Drive Gear (A)................................ 66

3.3.17 Registration Roller Assy (B) ............................................................................. 67

3.3.18 Registration Clutch and Registration Motor Assy............................................. 68

3.3.19 Main Cooling Fan ............................................................................................. 69

41316401TH Rev.4 4 /

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3.3.20 Color Registration Sensor Assy........................................................................ 70

3.3.21 Duplex Guide Assy........................................................................................... 71

3.3.22 Electrical Chassis Cooling Fan......................................................................... 72

3.3.23 Printer Engine Controller PWB......................................................................... 73

3.3.24 Printer Unit Chassis.......................................................................................... 74

3.3.25 Entrance Cassette Sensor Actuator................................................................. 75

3.3.26 Entrance Sensor PWB...................................................................................... 76

3.3.27 Entrance MT Sensor Actuator and Entrance Belt Sensor Actuator.................. 77

3.3.28 Fuser Exit Roller............................................................................................... 78

3.3.29 Exit Sensor Assy .............................................................................................. 79

3.3.30 Fuser Latching Handle (L)................................................................................ 80

3.3.31 Belt Motor Assy ................................................................................................ 81

3.3.32 Fuser Latching Handle (R) ............................................................................... 82

3.3.33 Main Motor Assy............................................................................................... 83

3.3.34 Main Feeder Drive Motor.................................................................................. 84

3.3.35 Contact Assy/ Left Plate Assy .......................................................................... 85

3.3.36 Low Voltage Power Supply............................................................................... 86

3.3.37 High voltage power supply ............................................................................... 87

3.3.38 Main Feed Assy................................................................................................ 88

3.3.39 Cassette/ Left Guide Assy................................................................................ 89

3.3.40 Cassette/ Right Guide Assy.............................................................................. 90

3.3.41 Fuser Unit......................................................................................................... 91

3.3.42 Belt Unit............................................................................................................ 92

3.3.43 Duplex Unit....................................................................................................... 93

3.3.44 Guide Rails (L) and (R)..................................................................................... 94

3.3.45 Duplex Transport Assembly ............................................................................. 95

3.3.46 CU Assy............................................................................................................ 97

4. ADJUSTMENTS ............................................................................................. 99

4.1 Maintenance Modes and Their Functions...................................................................... 99

4.1.1 Maintenance menu........................................................................................... 99

4.1.2 Engine maintenance mode............................................................................. 100

4.1.2.1 Operator panel................................................................................... 100

4.1.2.2 General self-diagnosis mode (level 1)............................................. 100

4.1.2.2.1 Entering self-diagnosis mode (level 1) ............................ 100

4.1.2.2.2 Exiting self-diagnosis mode ............................................ 100

4.1.2.3 Switch scan test................................................................................. 101

4.1.2.4 Motor and clutch test ......................................................................... 104

4.1.2.5 Test printing .................................................................................... 106

4.1.2.6 NVM initialization............................................................................ 110

4.1.2.7 Consumable counter display........................................................... 111

4.1.2.8 Consumable counter display - continuous ...................................... 111

4.1.2.9 Error Messages and their Details.................................................... 112

4.1.3 CRM board adjustments................................................................................. 116

4.1.3.1 Short plug settings .......................................................................... 117

4.1.3.2 Printings singly using controller-equipped printer ........................... 117

4.2 Adjustments after Parts Replacement ......................................................................... 118

4.2.1 Precautions in replacing engine controller board ........................................... 118

4.2.2 Precautions in replacing EEPROM................................................................. 118

4.2.3 EEPROM replacement after CRM board replacement................................... 119

4.3 Color Balance Adjustment ........................................................................................... 120

5. PERIODIC MAINTENANCE ......................................................................... 122

5.1 Parts Replaced Periodically ......................................................................................... 122

5.2 Cleaning....................................................................................................................... 122

5.3 Cleaning LED Lens Array ............................................................................................ 122

5.4 Cleaning Pickup Roller................................................................................................. 122

41316401TH Rev.4 5 /

Page 6

6. TROUBLESHOOTING PROCEDURES ....................................................... 123

6.1 Before Troubleshooting................................................................................................ 123

6.2 Checking before Troubleshooting Image Problems..................................................... 123

6.3 Precautions in Troubleshooting Image Problems ........................................................ 123

6.4 Preparation for Troubleshooting .................................................................................. 123

6.5 Troubleshooting ........................................................................................................... 123

6.5.1 LCD messages list.......................................................................................... 124

6.5.2 Preparation for troubleshooting ...................................................................... 129

6.5.3 Troubleshooting image problems ................................................................... 140

7. CONNECTION DIAGRAM............................................................................154

7.1 Resistance Checks ...................................................................................................... 154

7.2 Program/Font ROM Layouts ........................................................................................ 158

8. Parts List......................................................................................................162

APPENDIX A CENTRONICS PARALLEL INTERFACE................................... 178

APPENDIX B 2ND/3RD TRAY MAINTENANCE .............................................. 182

41316401TH Rev.4 6 /

Page 7

LED Head

Centronics I/F

USB I/F

2 × Option Slots

Junction Board

Pulse Motor

Engine Control

Low V oltage

Power Unit

Fuser

Unit

High V oltage

Power Unit

2nd/3rd T ra y

Duplex

Unit

Belt

Unit

<Sensors, Switches and Thermistors>

Paper size sensor (4 bits)

Paper empty sensor

Paper near empty sensor

MT paper empty sensor

FF home switch

Loading sensor 1

Loading sensor 2

C-ID

Unit

M-ID

Unit

Y-ID

Unit

K-ID

Unit

C ID M ID Y ID K IDBelt Heat

MT/

Registration

Hopping

Operator Panel

3 × ROM

DIMMs

4 × RAM

DIMM

IDE

I/F(HDD)

DC Fan

Note

Note Option Slot:

LAN Card made by JCI

1. CONFIGURATIONS

1.1 System Configuration

Figure 1-1 shows the system configuration of the C7000 Series of printers.

Figure 1-1

41316401TH Rev.4 7 /

Page 8

1.2 Printer Configuration

The inside of the printers is composed of the followings:

• Electrophotographic Processor

• Paper Paths

• Controller Block (CU and PU)

• Operator Panel

• Power Units (High Voltage Unit and Low Voltage Unit)

Figure 1-2 shows the printer configuration.

Figure 1-2

41316401TH Rev.4 8 /

Page 9

1.3 Option Configuration

The following options are available for the C7000 Series of printers.

(1) 2nd Tray/ 3rd Tray

(2) Duplex Unit

(3) Expansion Memory 64/128/256 MB

(4) Internal Hard Disk

(5) OkiLAN 6200e NIC

41316401TH Rev.4 9 /

Page 10

1.4 Specifications

(1) External Dimensions Height: 16.9 in. Width: 16.9 in. Length: 24.4 in.

(2) Weight 92.5 lbs.

(3) Papers Type: Ordinary paper, Transparencies (Recommended: MLOHP01)

(4) Print Speed Color: 12 pages per minute (Transparency: 5 pages per minute)

(5) Resolution (C7200) = 600 × 600 -//- (C7400) 1200 x 1200 dots per inch

(6) Power Input 100VAC ±10%

(7) Power Consumption Peak:1300W Normal Operation: 400W (5% duty)

Size: Postal card, Legal 13" or 14", Executive, A4, A5, B5, A6 (Only

the 1st tray and the front feeder support A6 and postal-card sizes.)

Weight:1st tray55 kg to 90 kg (64 to 105g/m2)

Front feeder55 kg to 140 kg (64 to 163g/ m2)

Monochrome: 20 pages per minute (Transparency: 12 pages per minute) Postal Card, Label, Thick Paper: 8 pages per minute

Idle: 110W Power Saving Mode:45W or less

(8) Frequency 50Hz or 60Hz ±2%

(9) Noise Operation: 54 dB (Without second tray)

Standby: 45 dB Power Saving:43 dB

(10) Consumable Life Toner Cartridge: 10,000 pages (5% duty) (each of Y, M, C and K)

Image Drum: 30,000 pages (Continuous printing)

(each of Y, M, C and K)

(11) Parts Replaced Periodically Fuser Unit Assy: Every 60,000 pages

Transfer Belt Assy: Equivalent of 60,000 pages (3 pages/job)

41316401TH Rev.4 10 /

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(12) Temperatures and Relative Humidities Temperature

Temperature Condition

Temperature (˚F) Temperature (˚C) Remark

Operation 50 to 89.6 10 to 32 17 to 27˚C

(Temperatures to assure full

color print quality) Non-Operation 32 to 109.4 0 to 43 Power-off Storage (Max. One Year) -14 to 109.4 -10 to 43 With drum and toner Transport (Max. One Month) -20 to 122 -29 to 50 With drum and without toner Transport (Max. One Month) -20 to 122 -29 to 50 With drum and toner

Humidity

Humidity Condition

Relative Humidity Max. Wet-Bulb Remark

(%) Temperature(˚C)

Operation 20 to 80 25 50 to 70% (Humidities to assure full

color print quality) Non-Operation 10 to 90 26.8 Power-off Storage 10 to 90 35 Transport 10 to 90 40

(13) Printer Life 600,000 pages (on a A4-size basis) or five years

41316401TH Rev.4 11 /

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2. OPERATION DESCRIPTION

N71 Board

Belt

Fuse

K Fuse

Y Fuse

M Fuse

C Fuse

JODEN

14P

Paper Tray 1 Paper Empty

Paper Tray 2 Near Empty

WHITE

BLUE

OPTION

BLUE

WHITE

RED

10P 14P 14P

22P

11P 2P

YELLOW

FAN1 (Pr)

HUM/

TMP

FAN2 (Pow)

Plate Senosr

Gray

Blue

Z7L

Z7R

R71 Board

Manual Bypass Feeder (MBF)

Hopping

Motor

FF/Regist

Motor

K IDU

Motor

Y IDU

Motor

M IDU

Motor

C IDU

Motor

Belt

Motor

Heat

Motor

MBF Stage

MBF Paper Empty

Duplex Unit

DUP

V71 Board

Motor

Clutch

INSENS

FSENS

RSENS

Main

14P

Front Cover

Open

Microswitch

Duplex Cover

Open Microswitch

Upper Cover

Open Microswitch

COVOPN

71K Board

POWER

FAN

FAN(LEFT)

HVOLT

CPUFL1

PSIZE

DUCOV

FCOVER

DUPLEX

PARTTEMP

JODEN

RSNS

SW1

FSENS

FAN1

HUM/TMP

FAN2

CUIF

FAN4

Cord 18

Cord 19

BLACK

Exit Sns.

WHITE

REG

DCL

BELTHET

TR10P

SHUTTER

HOPFF

RCL ID

CLUTCH3

Main Motor Assy Belt Motor Assy

WHITE YELLOW

K LED HEAD

Control Panel

X71 board

Y LED HEAD

M LED HEAD

C LED HEAD

Toner Sensor (Y71-board)

Paper Size

Sensor

PXC-Board

AC Switch

CN1 CN1

CN5

CN2

High -Voltage

Power Supply

Low-Voltage

Power Supply

CN3

CN2

16P

30P

19P6P3P

16P

19P

8P 2P 16P

Cord 20

Cord 7

TNRK

PANEL

STUCK

POWER

4P 4P

4P 4P 4P 4P

RED WHITE

BLACK YELLOW RED BLUE

KPOW2

TNRY

YPOW2

TNRM

MPOW2

TNRC

CPOW2

OPTN

16P

3P3P3P

16P

STUCKFULL

Sns.

RED

BLACK

THERM1

THERM2

FUSE

NFU

FAN0

Up/Down

OHP Sen.

RAM

CRM Board

ROM

HDD

LAN

USB

CENTRO

The C7000 Series of printers, tandem color electrophotographic page printers, adopt technologies such as an LED array, OPC, dry single-component non-magnetic developing, roller transfer and heat-compression fusing. A black-writing printing method by shedding light on print areas is used.

41316401TH Rev.4 12 /

Figure 2-1 provides the block diagram of the printers.

Figure 2-1

Page 13

2.1 Main Board (CRM PWB)

14.31818MHz Crystal Resonator

CY2292

CY2308Delay CDC516

SDRAM DIMM

ROM DIMM

FET SW

162212

Flash ROM

IMI530

Fluctuation Circuit

LVC244

LVC245

EEPROM

C2 LSI

MHM2031-002

PCI Bus

LAN Board

L60851

USBCentro IDE HDD

LVC161284

Buf

16244

Buf

16244

Delay

PU Board Connector, 200 Pins

to C2 LSI and

3.3V ICs

to 5V ICs

Inverter RESET-P

3.3V5V

Reset

DS1834

2.0V Regulator

2.5V Regulator

C1 LSI

MHM2030

-002

PPC

750

Cache

Internal-CLK-

Adjusting

Resistance

80MHz

40MHz

80MHz

33MHz

48MHz

IF Bus

33MHz

SPD

PU-CU I/F,

Operator Panel

A/D, Cont (SUB Bus)

Y, M, C and K Video Data

Cont

A, Cont A, Cont A, Cont

A, Cont

A/D, Cont

Figure 2-2 provides the block diagram of the main control board (CRM PWB).

Figure 2-2

41316401TH Rev.4 13 /

Page 14

(1) CPU

The CPU is PowerPC750, a 64-bit bus RISC processor, which inputs an 80-MHz CLK (= BUS CLK), and operates at 400MHz that is five times the input.

(2) Secondary Cache SRAM

SRAM is included as secondary cache of the CPU on the board.

(3) ROM

ROM is to be inserted into the three 168 pin DIMM slots. The slot A is for program ROM and the slot B is for Japanese kanji fonts. The slot C is not assigned.

(4) RAM

RAM is to be inserted into the four 168 pin DIMM slots. The DIMMs must be fitted in descending labeled type No. order into the slots 1, 3, 2 and 4.

SDRAM DIMM Specifications:

Speed: PC100 or more Capacity: 64/128/256 MB Configuration: Without parity. Without ECC. SPD information is required. Number

of chips contained = 8 or 16.

(5) EEPROM

EEPROM, an 8-pin DIP package, is to be inserted into the IC socket. The EEPROM is of 16 Kbits for 3.3V power supply, and settings for controlling the controller block are stored in it.

(6) Flash ROM

A 2-Mbyte flash ROM is surface-mounted on the CRM board. The flash ROM is composed of four 256-k-by-16bit chips, and fonts and macros can be stored in it.

(7) Memory Control LSI (CI)

A 696-pin BGA package ASIC made by NEC, which is equipped with a cooling heat sink and mainly controls a CPU I/F, memory, video data compression and decompression, and a PUvideo I/F.

(8) Interface Control LSI (C2)

A BGA package ASIC made by Toshiba, which controls a PU command I/F, operator panel I/F, IDE I/F, Centronics I/F, USB I/F, PCI I/F, EEPROM and a SPD (SDRAM DIMM) I/F.

(9) IDE HDD

An IDE connector is surface-mounted on the board to which an IDE HDD assembled using exclusive molds will be connected. The IDE HDD is used for storing font data, spooling edited video data and registering form data.

(10) PCI Bus Option

Two PCI I/F slots are provided for option board use. The bus, which uses an Oki Data original connector, can accept an Ethernet board.

(11) Host Interface

Standard: Centronics two-way parallel I/F (IEEE-1284-compliant)

USB (USB1.1-compliant)

Additional Board: (connected to PCI BUS)

Ethernet Board

41316401TH Rev.4 14 /

Page 15

2.2 Engine Controller Board (K71 PWB)

28MHz

(Color registration sensor adjustment)

Analog input

(Temperature variation)

Analog input (Transparencies)

Analog input (Various densities)

CPU BUS

Toner and ID sensors ID checks

Control Panel

Duplex

Cassette 2/3

Analog output Analog Input

Switch

48MHz

32bit Video I/F

Heater control

Fuse Cut

Driver

EEPROM

D/A

CU I/F

CPU

MSM66Q577

A/D CON

LSI

(VIDEO MEM

Containing

4Mbit DRAM)

Fan control Cover front/upper open

Stacker full Test switch

(Power supply cooling)

4Kbit(512KByte)

FLASH

Interruption by motor Interruption by UART

K Head I/F Y Head I/F M Head I/F C Head I/F

Motor Driver

High Voltage Power Supply

Serial Interface (2 channels)

256Kbit(32KByte)

SRAM

Pulse Motors

Paper Feed System Sensors (Paper Feed, Paper Registration, Write and Eject Sensors) MT Sensor (Stage position and paper empty) Cassette 1 Sensor (Paper empty and near empty) Any of Shutter, Clutch, Belt Home and Transparency Sensors Belt and Fuser Checks Cassette Size

Figure 2-3

The engine control block (PU) is controlled by the engine controller board (K71 PWB) which consists of a CPU (MSM66Q577), general LSI chip, flash ROM, EEPROM, pulse motor drivers and a video memory (see Figure 2-4).

(1) CPU

This, a 16-bit CPU with an AD converter containing 126-Kbyte ROM (OKI MSM66Q577), controls the entire system.

(2) General LSI

This LSI (MG63P011-001LA), which is contained in the printer engine control block, has 4 Mbits of video memory, and functions such as controller-engine video interfacing, LED interfacing, motor control, sensor input, video memory control, main scan color misalignment correction, skew correction and high voltage power supply control.

41316401TH Rev.4 15 /

Page 16

(3) Flash ROM

The flash ROM (29F400-70) is of 4-Mbits, and PU programs are stored in it.

(4) EEPROM

The EEPROM (NM93C66N-NW) is of 4-Kbits, and mounted on the board with an IC socket. Correction values are stored in it.

(5) Pulse Motor Driver

The pulse motor driver (A2919SLBTR, A2918SWV) drives the eight pulse motors to revolve the EP and transport media.

(6) SRAM

This SRAM (62256LFP-7LL) is used as working memory of the CPU.

2.3 Power Units

There are a low voltage power unit consists of an AC filter circuit, low voltage power circuit and heater driver circuit, and a high voltage power unit organizes a high voltage power circuit.

(1) Low Voltage Power Unit

This circuit generates the following voltages:

Output Voltage Use for

+3.8V CU LSI +3.8V LED head +5 V Logic circuit power supply, PU CPU +34 V Motor, drive voltage and power supply voltage for high voltage power supply +12 V OP Amp, High voltage power supply

(2) High Voltage Power Unit

This circuit generates the following voltages of not less than +34V, which are required for electrophotographic process, according to control sequences from the controller board.

Output Voltage Use for Remark

CH -900V to 1.4KV Voltage to charging roller DB -100 to 400V/ +300V Voltage to developing roller SB Y, M, C and K: -100V to -700V Voltage to toner supplying roller TR 0KV to 7KV Voltage to transfer roller Variable

41316401TH Rev.4 16 /

Page 17

2.4 Mechanical Processes

Paper Eject Roller

Pape

ejection

(Face down)

Power Supply

Charging Roller

Cleaning Blade

Heat Roller

Paper

Eject

Roller

Fusing

Backup Roller

Control Signals

LED Head

Developing Roller

Power Supply

Toner Cartridge

Transfer Roller

Paper

registration

Registration

Roller 1

Paper loading

Hopping Roller

Power

Supply

Registration

Roller 2

Paper ejection Fusing Cleaning Transfer

Paper transport Paper advance

Transfer

Development

Paper Eject

Sensor

Paper Feed

Sensor 1

Paper Feed

Sensor 2

Paper Cassette

Paper

registration

(FF, 1ST, 2ND)

Write Sensor

YMC

Duplex printing

Paper path

selection

Paper path

selection

Paper traveling

OPC drum revolution

Charging

Exposure

Cleaning

Paper

ejection

(Face up)

Multipurpose Tray

Figure 2-4 shows the mechanical processes of the C7000 Series of printers.

41316401TH Rev.4 17 /

Figure 2-4

Page 18

2.4.1 Electrophotographic process

(1) Electrophotographic process

The following is the outline of electrophotographic process:

1 Charging

DC voltage is applied to the charging roller and the surface of the OPC drum is negatively and evenly charged.

2 Exposure

The LED head, under image signals, emits light to the negatively charged surface of the OPC drum. The radiated portions of the drum surface attenuate in negative charge according to the intensity of the light and, based on the surface potentials, a latent electrostatic image is formed on the drum surface.

3 Development

Negatively charged toner contacts the OPC drum and by electrostatic force adheres to the latent electrostatic image to form a clear image on the drum surface.

4 Transfer

Placed on the surface of the OPC drum, paper is positively, or opposite to the polarity of the toner, charged by the transfer roller on its back to transfer the toner image to the paper.

5 Cleaning

The cleaning blade removes residual toner from the OPC drum after the transfer.

6 Fusing

The toner image on the paper is fused into place through the application of heat and pressure to it.

41316401TH Rev.4 18 /

Page 19

(2) Charging

Negative DC voltage is applied to the charging roller contacting the surface of the OPC drum.

Power

unit

Charging roller

OPC drum

(3) Exposure

The negatively charged surface of the OPC drum is radiated with light from the LED head. The negative charge of the radiated portions of the drum surface attenuates in response to the intensity of the light and a latent electrostatic image responsive to the potentials of the surface is formed on the drum surface.

LED head

Power

unit

Charging roller

OPC drum

Paper

LED head

OPC drum

41316401TH Rev.4 19 /

Page 20

(4) Development

By the adhesion of toner to the latent electrostatic image on the drum surface, the image is changed to an image of its toner. The development is processed at the contact portion between the OPC drum and the developing roller.

1 The sponge roller causes toner to adhere to the developing roller. The toner becomes

negatively charged.

Developing blade

Charging roller

Sponge roller

OPC drum

Developing roller

2 The developing blade removes excess toner from the developing roller and a thin layer

of toner remains and forms on the developing roller.

3 The toner is drawn by the latent electrostatic image at the contact portion between the

OPC drum and the developing roller. The latent electrostatic image on the drum surface is made visible with the toner.

41316401TH Rev.4 20 /

Page 21

(5) Transfer

The transfer roller, which is made of conductive sponge, presses paper against the surface of the OPC drum and brings the paper into intimate contact with the drum surface. The paper is placed on the drum surface, and positively (opposite to the charge of the toner) charged by the transfer roller on its back. Applying positive high voltage from the power supply to the transfer roller moves the positive charge induced by the transfer roller to the paper surface at the contact portion between the transfer roller and the paper, the paper surface drawing the negatively charged toner from the drum surface.

OPC drum

Paper

Transport belt

Transfer roller

Power unit

(6) Fusing

When passing through between the heat roller and the backup roller, the toner image transferred to the paper is fused into place by the application of heat and pressure to it. The built-in upper and lower halogen lamps of 700 watts and 500 watts heat the Teflon coated heat roller. The fusing temperature is controlled by the sum of the temperature detected by the thermistor moving over the heat roller surface and the temperature detected by the thermistor moving over the backup roller surface. For safety, a thermostat is provided and, when the heat roller temperature rises by a fixed degree or more, becomes open to cut off voltage supply to the heater. The backup roller is being pressed against the heater by the pressure springs on both sides.

Thermostat

Thermistor

Heat roller

Paper

Thermostat

Backup roller

41316401TH Rev.4 21 /

Thermistor

Page 22

(7) Cleaning

Non-fused, residual toner on the OPC drum is scraped with the cleaning blade and collected in the waste toner area of the toner cartridge.

Waste toner area

(8) Cleaning

Residual toner on the transfer belt is scraped with the cleaning blade and collected in the waste toner box of the transfer belt unit.

Cleaning blade

Waste toner box

41316401TH Rev.4 22 /

Page 23

2.4.2 Paper running process

Figure 2-5 shows the traveling of paper in the C7000 Series of printers.

Registration roller Assy (B)

Hopping roller

Multipurpose tray

Registration roller Assy (A)

Cleaning blade

Transfer roller ×4

Feed roller

Unit × 4

Head × 4

High voltage power supply

Face-down stacker

MYK

Belt unit

Heat roller

Backup roller

Cassette 1

Cassette 2

Fuser

Eject roller

Low voltage

power supply

Figure 2-5 Paper Paths

Cassette 3

41316401TH Rev.4 23 /

Page 24

(1) Paper Feed from Tray

1. The running of the feed motor in the arrow direction (a) drives the feed roller and the nudger roller. This operation feeds paper from the tray.

2. After the beginning of the paper turns the entrance cassette sensor on, the paper is advanced a fixed length. When the paper beginning reaches the registration roller Assy (A), the feed motor stops.

3. The running of the registration motor in the arrow direction (b), which synchronizes with the above paper advance operation, drives the registration roller Assy (B) and the electromagnetic clutch. The registration roller Assy (A) moves with the operation of the electromagnetic gear when the paper beginning touches the registration roller Assy (A), where the feed motor does not run. The feed roller idles via the built-in one-way clutch and the nudger roller idles because the planet gear is disengaged.

4. The registration motor transports the paper until the paper end passes through the entrance belt sensor.

Registration motor

Electromagnetic clutch

Registration roller Assy (A)

Entrance cassette sensor

Entrance belt sensor

Registration roller

Assy (B)

Feed motor

Feed roller (One-way clutch gear)

Paper gear

Nudger roller

Paper

Figure 2-6

41316401TH Rev.4 24 /

Page 25

(2) Paper Feed from Multipurpose Tray (MT)

1. The release lever usually pushes down the hopping plate to a position that turns microswitch on (Figure 2-7-a).

2. The running of the motor in the (a) direction drives the MT feed roller and turns the cam. The cam pushes the release lever and the hopping plate picks up paper sent out by the MT feed roller (Figure 2-7-b), where the registration roller Assy (B) does not move because its one-way clutch gear (1) idles.

3. After the paper beginning turns the entrance sensor on, the paper is forwarded a fixed length. The paper stops when its beginning reaches the registration roller Assy (B).

4. At the same time, the cam pushes down the hopping plate. The release lever that has been placed in its original position by the spring locks the hopping plate (Figure 2-7-c).

5. After the completion of the paper feed operation, the registration motor runs in the arrow direction (b) to drive the registration roller Assy (B), where the one-way clutch gear (2) does not allow the MT feed roller to move.

One-way clutch gear (2)

MT feed roller

Entrance sensor

Paper

Entrance belt sensor

Registration motor

Release lever

Spring

Registration roller Assy (B)

One-way clutch gear (1)

Figure 2-7

Hopper plate

Feed roller

Microswitch

Figure 2-7-a Figure2-7-b Figure 2-7-c

41316401TH Rev.4 25 /

Page 26

(3) Transport Belt

1. The running of the transport belt motor in the arrow direction (a) drives the transport belt. The belt unit sits with one transport roller immediately below each color’s drum, and the transport belt between them. By the application of a fixed voltage, the transport belt and the transport roller feed paper on the transport belt into the fuser unit, transferring a toner image on each color’s drum.

Drum

Transport belt

KYMC

Transport (transfer) roller

Transport (transfer) belt motor

Figure 2-8

41316401TH Rev.4 26 /

Page 27

(4) Driving and Up-and-Down Movements of I/D Unit

1. The I/D unit driving and up-and-down movements are effected by a single-pulse motor. The running of the main motor in the arrow direction (a) turns the lever 1 to the left. Then, the lever 2 that was lifted by the lever 1 lowers to move down the I/D unit. After the up/ down sensor is turned off (Figure 2-9-d), specified downward pulsing places the I/D unit in its lowest position, or equivalently, printing position (Figures 2-9-a and 2-9-c). The drum gear engages with the driving gear and starts revolving to transfer an image on the drum to running paper, where the one-way gear idles upon placement of the lever in its lowest position.

2. With the running of the main motor in the arrow direction (b), the lever 1 pushes up the I/ D unit via the lever 2. After the up/down sensor is activated (Figure 2-9-d), the lever 1 lifts the I/D unit to a specified level and stops to keep space to an extent between the drum and the transport belt (Figures 2-9-c and 2-9-e). The drum gear is not engaged with the driving gear and does not revolve.

3. When the two pins of the up/down sensor are pushed up by the I/D unit, and touches and electrically connected to the plate above the pins, the sensor recognizes the on state. When the two pins are pushed down by the I/D unit, and separated and insulated from the plate, the sensor recognizes the off state. The installation of the I/D unit can also be verified by recognizing the off state of the up/ down sensor.

Lever 2

Driving gear

I/D unit

Drum

One-way gear

Lever 1

Figure 2-9-a Figure 2-9-b

41316401TH Rev.4 27 /

Page 28

Plate

Pin Spring

Board

Up/down sensor

Figure 2-9-c

Figure 2-9-d

Figure 2-9-e

41316401TH Rev.4 28 /

Page 29

(5) Fuser Unit and Paper Ejection

1. A single-pulse motor drives the fuser unit and the eject rollers. In response to the running of the heat motor in the arrow direction (a), the heat roller turns. This roller fuses a toner image to paper by heat and pressure.

2. At the same time, the four eject rollers move to eject the paper.

3. The ejection path is switched back and forth between the route to the face-up stacker and the route to the face-down stacker as follows. When the face-up stacker opens, the paper separator inclines in the direction that guides the paper to the face-up stacker. When the face-up stacker closes, the paper separator inclines in the direction that sends the paper to the face-up stacker.

Eject rollers

Fuser unit

Heater motor

Heat rollers

Figure 2-10

Paper separator

Face-up stacker

41316401TH Rev.4 29 /

Page 30

(6) Duplex Unit

1. When the duplex unit receives an instruction from the printer to print on both sides of a sheet of paper, the solenoid opens the separator after the completion of one side printing of a sheet of paper sent from the tray. The path is switched to that to the duplex unit. At this time, as the roller (1) turns in the direction of the arrow “a,” the paper is retracted on the rear of the cassette.

2. When fixed time has elapsed after the paper beginning passes through the duplex-in sensor, the rollers reverse and the roller (1) turns in the direction of the arrow “b” to feed the paper into the duplex unit. After that, the paper passes through the rollers (2), (3) and (4), and ejected with the other side printed, and fed again into the printer.

Separator

Figure 2-11

Solenoid Duplex-in sensor

Motor

Roller(2)Roller(3)Roller(4)

Roller(1)

41316401TH Rev.4 30 /

Page 31

2.5 Sensor

2.5.1 Paper related sensors

Paper eject roller

Heat roller

Stacker full sensor

C drum

K drumY drumM drum

Entrance belt sensor

MT feed roller

Exit sensor

Backup roller

Duplex in sensor

Duplex rear sensor

Duplex roller

Sensor

Entrance MT sensor Entrance Cassette sensor Entrance Belt sensor

Exit sensor

Duplex In sensor

Duplex Rear sensor

Duplex Front sensor

Stacker Full sensor

Driving roller

Belt cleaning blade

Registration roller B

Entrance MT sensor

1st feed roller

Duplex feed rollers

Transport belt

Duplex front sensor

Function

Detects the beginning of incoming paper to determine the timing for switching from hopping to transport. Detects the beginning of transported paper and, based on the time taken until the paper beginning reaches the sensor, determines the paper length. Detects the beginning and end of paper to determine the paper ejection timing. Detects the beginning of paper that enters into the duplex unit, to determine the time taken until the reversed rollers turn in forward direction. Detects the beginning of reversed paper in the duplex unit.

Detects the end of reversed paper in the duplex unit to determine the paper ejection timing. Detects the face-down stacker full of paper.

Pinch roller 2

2nd feed roller

Sensor status

: Paper is present.

OFF

: Paper is absent.

: Paper is present.

OFF

: Paper is absent.

: Paper is present.

OFF

: Paper is absent.

: Paper is present. : Paper is absent.

OFF

: Paper is present.

ON OFF

: Paper is absent.

: Paper is present.

OFF

: Paper is absent.

: Stacker is full.

OFF

: Stacker is empty.

Pinch roller 1

Registration roller A

Entrance cassette sensor

Auxiliary rollers

41316401TH Rev.4 31 /

Page 32

2.5.2 Other sensors 1 Paper Empty sensor

This sensor checks whether the paper cassette is empty.

2 Paper Near sensor

This sensor checks whether the paper cassette is near empty.

3 MT Paper Empty sensor

This sensor checks whether paper exists in the front feeder.

4 MT Hopping switch

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

5 Paper Size switch

This sensor detects the size of paper in the paper cassette.

6 ID Up/Down sensor (one for each of colors, Y, M, C and K)

This sensor checks whether the ID unit is in the up position or in the down position.

7 Toner K, Y, M and C sensors

These sensors checks whether the waste toner cartridges are full by measuring the time interval between regular opening movements of toner sensors’ respective levers.

8 Temperature sensor

See section 2.7 (Transfer Control Responds to Environmental Changes).

9 Humidity sensor

See section 2.7 (Transfer Control Responds to Environmental Changes).

0 OHP sensor

This sensor detects the presence or the absence of transparencies.

A Alignment sensor

Upon correction of color misalignment, this sensor reads the alignment pattern printed at the right and left ends of the transfer belt (see section 2.13).

41316401TH Rev.4 32 /

Page 33

2.6 Color Misalignment Correction

Each of the C7000 Series of printers is equipped with 4 ID units and LED heads, which can cause color misalignment. This color misalignment is automatically corrected as follows:

(1) Color alignment to be corrected

1 Color misalignment in X-axis direction (Positional error caused by LED head) 2 Color misalignment in slanting direction (Positional error caused by LED head) 3 Color misalignment in Y-axis direction (Positional error caused by I/D unit and LED head)

(2) Correcting

A preset pattern to detect color misalignment is printed on the belt. The reflection sensor reads the printed pattern, each color’s misalignment value is sensed and its correction value is determined. The correction value is used each color’s (Cyan, Magenta and Yellow) writing timing in comparison with that of Black.

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

The C7000 Series of printers measure the room temperature and the relative humidity using their room temperature sensors and humidity sensors. An optimum transfer voltage under each measurement environment is calculated to perform real-time control on printing with its optimum voltage.

Value Read by

Sensor

5 10 10 15 15 20 20 25 25 30 30 35

Temperature (˚C)Temperature (˚C)

35 40

Value Read by

Sensor

5 10 10 15 15 20 20 25 25 30 30 35 35 40

Value Read by Sensor

Value Read by

Sensor Register Value

16B(H) 19E(H) 19E(H) 1D1(H) 1D1(H) 204(H)

204(H) 236(H) 236(H) 265(H) 265(H) 290(H) 290(H) 2B9(H)

2B9(H)

Value Read by Sensor

Value Read by

Sensor Register Value

16B(H) 19E(H) 19E(H) 1D1(H) 1D1(H) 204(H)

204(H) 236(H) 236(H) 265(H) 265(H) 290(H) 290(H) 2B9(H)

2B9(H)

59(H)

Environment sensing table

7 7 7 6 5 4 4 2 2

Humidity (%)

45 55

5C(H) 70(H)

Humidity (%)

45 55

5C(H) 70(H)

H/H

15 25

1E(H)

1E(H) 33(H)

8 8 8 8 7 7 7 6 6

1E(H)

N/L1 N/L1 N/L2 N/N N/L1

H/L

8 8 8 7 7 6 6 6 5

15 25

1E(H) 33(H)

L/L

H/L

25 35

33(H) 47(H)

25 35

33(H) 47(H)

47(H) 5C(H)

8 8 7 7 6 6 5 4 4

47(H) 5C(H)

N/L2 N/N

35 45

7 7 6 5 4 4 2 1 1

55 65

70(H) 85(H)

7 6 5 4 4 3

H/H H/H

1 1 1

55 65

70(H) 85(H)

H/H H/H

65 75

85(H) 99(H)

65 75

85(H) 99(H)

99(H) AE(H)

7 6 5 4 3

H/H H/H

1 1 1 1

99(H) AE(H)

H/H H/H

75 85

6 5 4 3 3 1 1 1 1

75 85

AE(H)

6 5 4 3 2 1 1 1 1

AE(H)

41316401TH Rev.4 33 /

Page 34

2.8 Paper Jam Detection

The C7000 Series of printers detect paper jams after power-on and during printing. When a paper jam occurs, the printing operation is immediately suspended. After the cover is opened and the jammed paper is removed, closing the cover resumes the printing.

Classification/Belt STSOP/ 7

SSTOP/ 5 OPJAM/ 6 OPFEED/ 4 SSTOP/ 5 OPJAM/ 6 OPFEED/ 3 SSTOP/ 5 OPJAM/ 6 OPFEED/ 2, 1, 0 STSOP/ 5 OPJAM/ 5 STSOP/ 5 OPJAM/ 4 STSOP/ 5 OPJAM/ 3 STSOP/ 5 OPJAM/ 2

STSOP/ 5 OPJAM/ 1 STSOP/ 5 OPJAM/ 0 STSOP/ 4 OPAP/ 3 STSOP/ 4 OPAP/ 2, 1, 0

ERROR

Paper Size Error

The entrance cassette sensor has not turned off within fixed time after its turn-on. Loading of multiple sheets of paper has been detected.

Misfeed from Duplex

Paper could not be loaded from the duplex transport assembly.

Transport Assembly Misfeed from

Paper could not be loaded from the MT.

Multipurpose Tray (MT) Misfeed from Cassette

Paper could not be loaded from the cassette 1, 2 or 3.

1, 2 or 3 Duplex Paper

Reversing Jam Duplex Unit Entrance Paper Jam Duplex Unit Paper

The duplex rear sensor has not turned on during the paper reversing operation of the duplex unit. The duplex-in sensor has not turned on during the paper loading in the duplex unit.

The duplex front sensor has not turned on during the operation. Input Jam Paper Ejection Jam

The paper exit sensor has not detected the end of paper within fixed

time after the detection of the beginning of it. The paper exit sensor

has not turned off since its turn-on. Paper Transport Jam

The paper exit sensor has not turned on while paper is running on

the belt. Loading Jam

Paper has not reached the entrance belt sensor or the MT sensor

after the completion of the hopping. MT Paper Empty

Cassette 1, 2 or 3

There is no paper in the multipurpose tray.

There is no paper in the cassette 1, 2, or 3. Paper Empty

Error Condition

Paper Ejection

Duplex-in

sensor

Duplex rear sensor

Paper exit sensor

Duplex Entry

Duplex rear sensor

Entrance belt sensor

Paper Transport

Duplex Input

Duplex front sensor

Cassette 1

Cassette 2

Cassette 3

Entrance FF sensor

Paper Ejection

Entrance cassette sensor

Multipurpose tray

(MT)

Misfeed from MT

Misfeed from Duplex Unit Misfeed from Cassette 1 Misfeed from Cassette 2

Misfeed from Cassette 3

41316401TH Rev.4 34 /

Page 35

2.9 Cover-Open

When the top cover of the printer is open, the cover-open microswitch turns off to cut the high voltage power and output of not less than 32V. At the same time, the CPU receives CVOPN signals for indicating the status of the microswitch to handle the cover-open. When the front cover is open, the microswitch also turns off and the 32V power to the duplex unit is cut. The CPU receives FCOVER signals for indicating the status of the microswitch to handle cover-open.

71K-PCB

Top cover

microswitch

Detection

Circuit

Detection

Circuit

CPU

66577

P10, 5

P7, 6

+32V

COVOPN (2P)

High voltage power supply board

HVOLT (16P)

Detection

Circuit

High voltage power supply unit

FCOVER(3P)

Front cover microswitch

Duplex unit

Duplex (16P)

41316401TH Rev.4 35 /

+32V

V71-PCB

Page 36

2.10 Toner Low Detection

• Structure

The toner low detection device consists of the stirring gear that revolves at a constant speed, the stirring bar, and the magnet on the stirring bar. The stirring bar turns in synchronization with the protrusion of the stirring gear.

Stirring gear

Protrusion

Stirring bar

• Detection

A toner low condition is detected by measuring the contact time between the sensor lever magnet and the stirring bar.

Toner low sensor

Sensor lever A

Toner Full Condition

• The stirring bar turns in synchronization with the stirring gear.

Sensor lever B

• Even when the stirring bar magnet is place in its highest position, the stirring bar turns by the force of the stirring gear because the opposite side of the bar is placed in toner.

Toner cartridge

Stirring bar

Toner low sensor

Toner Low Condition

Sensor lever A

• The stirring bar reaches its highest position, then falls to its lowest position under its own weight because of the absence of toner resistance on the opposite side. In this situation, the bar-magnet

Sensor lever B

contact time becomes long. By measuring the time, a toner low condition is detected.

Toner cartridge

Stirring bar

41316401TH Rev.4 36 /

Page 37

Toner Full Condition (12PPM)

TNRSNS

T=2.3

Toner Low Condition (12PPM)

TNRSNS

T=2.3

• When the toner low condition is detected 20 consecutive times, toner low is determined. (The toner low message is displayed when about 500 A4 sheets at 5% density have been printed after toner low had been detected.)

• When the toner full condition is detected 10 consecutive times, toner low is removed.

• When the toner sensor remains unchanged for more than 15 cycles of 2.3 seconds, the toner

sensor alarm is activated.

t1<1.08

t1>1.08

• The toner sensor does not perform the detection while the drum motor is not running.

2.11 Page Size Detection

Via the cam moves jointly with the paper guide of the paper cassette, the four tab pieces are driven according to the set position of the paper guide.

Upon installation of the paper cassette, the microswitch detects the condition of the tab pieces and the paper size is recognized.

State of Microswitch Paper Size

SW1 SW2 SW3 SW4

0 1 1 1 Letter 0 1 0 1 Executive 0011A4 1 1 1 0 Legal 14 1 0 1 1 Legal 13 1101B5 1100A5 1001A6

41316401TH Rev.4 37 /

Page 38

2.12 Operation at Power-on

2.12.1 Self-diagnostic test

(1) Initial test

The followings are automatically performed at power-on. (a) ROM check (b) RAM check (c) EEPROM check (d) Flash ROM check

(2) ROM check

ROM is checked by calculating a HASH value.

(3) RAM check

(a) RAMs are by type. Out-of-specification RAM is judged as an error. (b) The order of mounted RAMs is checked. Out-of-standard order is judged as an error. (c) Each slot’s RAM is checked by read-after-write operation.

(4) EEPROM check

Specific data stored at a fixed address of EEPROM is checked..

(5) Flash ROM check

The flash ROM format is checked. Unformatted ROM is formatted after read-after-write checking.

(6) Option unit check

Before the printer goes into the operation mode, the presence of the option units (e.g., the HDD, NIC, option trays and duplex unit) is checked.

41316401TH Rev.4 38 /

Page 39

2.13 Color Misalignment Detection

Reflection-type optical sensors for detecting color misalignment (Z71-PCB) are mounted on the belt at the right and left ends, respectively, in front of the toner scraping (cleaning) blade which is at the back of the belt unit. The color misalignment detection pattern is printed on the belt at each of the right and left ends and, by reading the patterns by the reflection-type optical sensors, the misalignment amounts are measured with respect to Black to determine correction values. Then, the misalignment in main-scanning, sub-scanning and slanting directions is corrected. These operations are performed at power-on, at cover-close and every 200 pages.

CMYK

Transfer belt

LED head

Belt running direction

Color alignment sensors L and R

Transfer belt

Color alignment sensor R

Belt running direction

Color alignment sensor L

(Bottom View)

Cleaning blade

41316401TH Rev.4 39 /

Page 40

2.14 Version Read of Units Replaced Periodically

The version of each of the I/D, fuser unit and belt unit which are replaced periodically is determined whether it is new or previous according to whether the fuse in it is conducting or out of conduction. When the fuse is conducting, the unit is decided that it is new. The “new” or “previous” judgment is performed at power-on and at cover-close. The life counter of every new unit is reset and the “new” or “previous” judging purpose fuse in the unit is cut.

2.15 Life Count for Units Replaced Periodically

The life of each of the I/D, fuse unit and belt unit which are replaced periodically is counted as shown in the following table:

Unit Name

I/D (Image Drum Cartridge)

Toner Cartridge

Belt Unit

Fuser Unit

The number of drum revolutions is counted, on a letter paper length + continuous-printing paper interval basis. End of Life: Time when a distance equivalent to pages of 20K is printed (3P/J). The number of dots printed is counted. The used amount is determined based on the counter value (See section 2.16). End of Life: Time when toner low occurs. The number of drum revolutions is counted, on a letter paper length + continuous-printing paper interval basis. The count of one is performed every time when one page is passed. End of Life: Time when the counter value reaches 60K. The count of one is performed every time when one page is passed. End of Life: Time when the counter value reaches 60K.

2.16 Toner Consumption Detection

The used toner amount is detected by counting the number of dots printed. The counting starts after toner low is removed. The sum of the counted values is stored in EEPROM. Upon detection of toner low, the amount used is forcedly set to 8%. After that, when the equivalent of pages of 1K on A4 and 5% duty is reached, toner-empty occurs and the printing stops.

Condition

Action

Warning (the unit can still be used).

Do not use the unit anymore.

Warning (the unit can still be used).

41316401TH Rev.4 40 /

Page 41

3. PARTS REPLACEMENT

This section describes the procedure for replacing the parts, assemblies and units in the field. The replacing procedure is given for detachment. To attach, use the reverse procedure.

3.1 Precautions in Replacing Parts

(1) Before replacing the parts, be sure to remove the AC cable and the interface cable.

(a) To remove the AC cable, always use the following procedure.

i) Flip the power switch of the printer off (to “O”). ii) Pull the AC inlet plug of the AC cable out of the AC receptable. iii) Remove the AC cable and the interface cable from the printer.

(b) To connect the printer again, always use the following procedure.

i) Connect the AC cable and the interface cable to the printer. ii) Insert the AC inlet plug into the AC receptacle. iii) Flip the power switch of the printer on (to “I”).

Disconnect

(2) Do not disassemble the printer so long as it operates properly.

(3) Minimize the disassembly. Do not detach parts other than those shown in the replacing procedure.

(4) For maintenance, use designated tools.

(5) Follow the order instructed to disassemble the printer. Incorrect order may damage the parts.

(6) Small parts such as screws and collars tend to get lost, so temporarily place and fix them in

(7) When handling ICs and circuit boards such as microprocessors, ROMs and RAMs, do not use

Connect

their original positions.

gloves that likely to have static.

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

41316401TH Rev.4 41 /

Page 42

[Maintenance Tools]

Table 3-1 lists tools necessary to replace the FRU's (Field Replaceable Units).

Table 3-1 Maintenance Tools

No.

7 1

No. 1-100 Philips screwdriver

No. 2-200 Philips magnetic screwdriver

No. 3-100 screwdriver

No. 5-200 screwdriver

Digital multimeter

Pliers

Handy cleaner

LED Head cleaner P/N 4PB4083-2248P001

Q' ty Use for RemarkMaintenance Tools

Screws of 2 to 2.5mm

Screws of 3 to 5mm

LED head cleaning

41316401TH Rev.4 42 /

Page 43

3.2 Parts layout

Figure 3-1

41316401TH Rev.4 43 /

Page 44

[Top Cover Assy]

Figure 3-2

41316401TH Rev.4 44 /

Page 45

[Printer Unit-1/2]

Figure 3-3

41316401TH Rev.4 45 /

Page 46

[Printer Unit-2/2]

Figure 3-4

41316401TH Rev.4 46 /

Page 47

[Cassette Guide Assy (L),(R)]

C’

Figure 3-5

41316401TH Rev.4 47 /

Page 48

[Duplex Unit]

Figure 3-6

41316401TH Rev.4 48 /

Page 49

3.3 Replacing Parts

This section describes how to replace the parts and assemblies shown in the following disassembling system diagram.

C7000 41256201

Print Engine Controller PWB (3.3.23) X 4 LED Assy (3.3.2) 40737401 Low Voltage Power Supply (3.3.36) 40737601 High Voltage Power Supply (3.3.37)

Cassette Guide

Printer Unit 4112801PP Insurator PB4076-5290P001 Main Cooling Fan Assy (3.3.19) 2381018P0001 HV T ape Harness

40847301 Main Motor Assy (3.3.33) 40846001 Main Feeder Motor (3.3.34)

40848801 Transport (Transfer) Belt Motor Assy (3.3.35) 40850201 Contact Assy (3.3.35) 41303601 Left Plate Assy (3.3.35) 40866301PA Multipurpose Tray Cover Assy (3.3.14) 40864301 Rear Cover (3.3.10) 40864401 Left Side Cover (3.3.12) 40864501 Right Side Cover (3.3.13) 40864601 Front Cover Assy (3.3.7) 41042501 Front Cover Inner Baffle (3.3.7) 1PA4128-1074G001 Face Up Tray (3.3.11) 40864901PA Frame Assy - Release

40839001 Left Cassette Guide Assy (3.3.39) 40839401 Right Cassette Guide Assy (3.3.40) 40839801 Main Feed Assy (3.3.38)

4PP4122-1217P001

40371301 Feed Roller (3.3.9) 40325401 Main Feeder Drive Gear (3.3.38) 40313201 Nudger Roller (3.3.9)

40841101 Printer Chassis (3.3.16) 40844301 Regist Roller Assy (A) (3.3.16) 40844303 Regist Roller Assy (B) (3.3.17) 40845801 Registration Motor Assy (3.3.18) 41187101 Registration Clutch (3.3.18) 40859201 Duplex Guide Assy (3.3.21)

40848501 Main Feeder Drive Gear A (3.3.34) 40846601 Main Feeder Drive Gear B (3.3.34)

40841401 Fuser Latching Handle (R) (3.3.32) 40841501 Fuser Latching Handle Spring (3.3.32)

Plastic Slide (3.3.40) 40349101 Cassette Guide Pivot (L) (3.3.40) 40349701 Plastic Roller (3.3.40) 40928101 Cassette Spring (3.3.40) 4PP4076-5359P001 Cassette Lock (3.3.40) 4PP4043-4526P001 Cassette Lock Spring (3.3.40) 4PB4016-1960P002 Foot (3.3.40) 40368304 Paper Size Sensing PWB PXC (3.3.40) 4PP4076-5360P001 Paper Size Actuator (3.3.40) 41143701 Duplex Assy Ground contact (3.3.40) 41309301 2nd Tray Connector (3.3.40) 41285701PA Plate Assy-SW(Front) (3.3.40)

4PP4122-1217P001 Plastic Slide (3.3.39) 40349102 Cassette Guide Pivot (R) (3.3.39) 40349701 Plastic Roller (3.3.39) 40928101 Cassette Spring (3.3.39) 4PP4076-5359P001 Cassette Lock (3.3.39) 4PP4043-4526P001 Cassette Lock Spring (3.3.39) 4PB4016-1960P002

40841301 Fuser Latching Handle (L) (3.3.30) 40841501 Fuser Latching Handle Spring (3.3.30) 40841601 Entrance Sensor Actuator #1 (3.3.25) 40841701 Entrance Sensor Actuator #2 (3.3.27) 40841801 Entrance Senspr Actuator #3 (3.3.27) 40842201 Waste Toner Sensor Actuator (3.3.27) 41253601 Duplex Gate solenoid Assy (3.3.28) 41253701 Registration Shutter Solenoid Assy 41275201 Registration Shutter 41275301 Registration Shutter Spring 41067201 Fuser Drive Gear-C (3.3.28) 40323901 Fuser Exit Roller (3.3.28) 40316301 Fuser Drive Gear-B (3.3.28) 4PP4076-3949P001 Fuser Exit Roller Bushing (L) (3.3.28) 4PP4043-4489P001 Fuser Exit Roller Bushing (R) (3.3.28) 41189701 Drum Contact Assy (3.3.15) 41258301 Entrance Sensor PWB (3.3.26) 41312801 Left Top Cover Spring Assy (3.3.24) 41312901 Right Top Cover Spring Assy (3.3.24) 40346801 Color Registration Sensor Assy (3.3.20) 41073601 Exit Sensor Assy (3.3.29)

Foot (3.3.39)

41275801PA Microswitch-Assy (3.3.40) 41275901PA Microswitch-Assy (3.3.40)

41316401TH Rev.4 49 /

Page 50

CU Board Assy

Top Cover

40862002 Multipurpose Feeder Assy (3.3.14)

40952702 Multipurpose Feeder Top Cover (3.3.14) 40866701 Cassette Assy (3.3.8)

41395304 Board Assy-CU

41356004 Board_CRM 41286901 Plate_Shield 41278601

Guide_Rail (A) 41278701 Guide_Rail (B) 41371601 Plate_Support (C) 41395401 Plate_Support (FAN) 41410201 Motor-Fan 60x60x15 41278401 Screw PB4013-3100P006 x10 Cup Screw (S Tight M3) P3-6G Screw (Round Head) PB4083-2500P008 Tapping Screw PSW2W3-18C Screw(Round Head, SW+2W) 41467401 Plate FG (Centronics) 41597401 Label_Caution DIMM 41607101 Gasket

40859701 Top Cover (3.3.1) 4126001 Control Panel Bezel (3.3.4)

40325101 Multipurpose Feeder Drive Gear (3.3.14)

41045802

Link (3.3.14) 4YB4120-1137P001 MT Paper Empty Sensor (3.3.14) 40863201 MT OHP Sensor (3.3.14) 41276001 MT Position Sensor (3.3.14)

40927901 Retard Pad Assy (3.3.8) 4PP4043-4698P001 Retard Pad Assy Spring (3.3.8)

40946809 PCB Assy_CRM 41469503 Board_TNY 41356110 Japanese font ROM DIMM Board_TNO (Two Heisei fonts) 41437402 Board Memory 64MB

41316501 Top Cover Inner Frame Assy (3.3.4) 40861001

LED Assy Spring (3.3.2) 41257901 LED Control PWB (Y71) (3.3.4) 40365404 Stack Full Sensor (3.3.4) 40860601 Z 4 Eject Roller (3.3.4) 41297301 Control Panel Assy (3.3.4) 2381005P0015 Control Panel Tape Harness (3.3.4) 41309601 LED Harness K (3.3.4) 41309602 LED Harness Y (3.3.4) 41309603 LED Harness M (3.3.4) 41309604 LED Harness C (3.3.4) 40861201 Top Cover Handle (3.3.5) 40861301 Top Cover Latch (3.3.5) 40861401 Top Cover Latch Spring (3.3.5) 40861501 Eject Guide Assy (3.3.6)

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3.3.1 Top Cover (1) Open the Top Cover assy.

(2) Remove the nine screws 1 to detach the top cover 2.

Figure 3-3-1 Top Cover

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Page 52

3.3.2 LED Assy/ LED Assy Spring (1) Open the top cover 1.

(2) Remove the three cables, and unhook the LED Assy 2 at two places to demount it (the two

springs 3 become detached together with the LED Assy 2).

(3) Remove the LED connector 4.

When assembling, attach the LED connector 4 to the LED head and insert the flat cable into it.

Figure 3-3-2 LED Assy/ LED Assy Spring

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3.3.3 Top Cover Unit (1) Remove the top cover (see section 3.3.1).

(2) Remove the rear cover (see section 3.3.10). (3) Remove the left side cover (see section 3.3.12). (4) Remove the right side cover (see section 3.3.13). (5) Remove the shield plates A and B (see section 3.3.22), and unplug the connector to separate

the top cover.

(6) Disengage the top cover unit 1 at two places to detach it.

Figure 3-3-3 Top Cover Unit

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3.3.4 Control Panel Assy/ Control Panel Bezel/ LED Control PWB/ Toner Sensors/ Stacker Full Sensor/

Control Panel/ Control Panel Tape Harness/ Eject Rollers

(1) Detach the control panel bezel placed in the control panel Assy 2. (2) Remove the screw 1 to demount the control panel Assy 2. (3) Detach the control panel tape harness D. (4) Remove the top cover unit (see section 3.3.3). (5) Unscrew the four screws 3 to remove the earth plate 4. (6) Remove the two screws 5, unhook all the connectors 6 and demount the LED control PWB 7. (7) Remove the screw 8. (8) Disengage the four claws to demount the toner sensor B. (9) Demount the stacker full sensor C. (10)Demount the exit rollers E. (11)Detach the LED harnesses, K, Y, M and C F. (12)Detach the top cover inner frame Assy G.

Figure 3-3-4 Control Panel Assy/ Control Panel Bezel/ LED Control PWB/ Toner Sensors/ Stacker

Full Sensor/ Control Panel/ Control Panel Tape Harness/ Eject Rollers

41316401TH Rev.4 54 /

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3.3.5 Top Cover Handle/ Top Cover Latch/ Top Cover Latch Spring (1) Remove the two screws 1 to detach the top cover handle 2 and disengage the top cover latch

3 (at the same time, the two top cover latch springs 4 become detached).

Figure 3-3-5 Top Cover Handle/ Tope Cover Latch/ Top Cover Latch Spring

41316401TH Rev.4 55 /

Page 56

3.3.6 Eject Guide Assy (1) Remove the five screws 1 to detach the eject guide Assy 2.

Figure 3-3-6 Eject Guide Assy

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3.3.7 Cassette Assy/ Front Cover Assy/ Front Cover Inner Baffle (1) Detach the cassette Assy 1.

(2) Open the front cover 2, and disengage it at two places to detach it. (3) Detach the front cover inner baffle 3.

Figure 3-3-7 Cassette Assy/ Front Cover Assy/ Front Cover Inner Baffle

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Page 58

3.3.8 Retard Pad Assy/ Retard Pad Assy Spring (1) Remove the cassette 1.

(2) Detach the retard pad Assy 2 (at the same time, the spring 3 becomes detached).

Figure 3-3-8 Retard Pad Assy/ Retard Pad Assy Spring

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Page 59

3.3.9 Feed Roller and Nudger Roller (1) Remove the cassette.

(2) Unlatch and demount the feed roller 1. (3) Unlatch and demount the nudger roller 2.

Figure 3-3-9 Feed Roller and Nudger Roller

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Page 60

3.3.10 Rear Cover (1) Remove the left side cover (see section 3.3.12).

(2) Remove the four screws 2 to detach the rear cover 1.

Note!

When attaching the rear cover, take care not to allow the spring 3 to get caught in parts.

Figure 3-3-10 Rear Cover

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Page 61

3.3.11 Face-Up Tray (1) Open the face-up tray 1 in the arrow direction, and disengage it at two places to detach it.

Figure 3-3-11 Face-Up Tray

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3.3.12 Left Side Cover (1) Open the top cover 1.

(2) Open the front cover 2 and undo the screw 3. (3) Remove the four screws 4 to detach the left side cover 5.

Figure 3-3-12 Left Side Cover

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Page 63

3.3.13 Right Side Cover (1) Open the top cover 1.

(2) Open the front cover 2 and undo the screw 3. (2) Remove the four screws 4 to detach the right side cover 5.

Figure 3-3-13 Right Side Cover

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3.3.14 Multipurpose Tray Assy/ Multipurpose Tray Cover Assy/ Links/ Multipurpose Tray Top Cover/

Multipurpose Tray Drive Gear

(1) Remove the left side cover (see section 3.3.12). (2) Remove the right side cover (see section 3.3.13). (3) Remove the left plate Assy (see section 3.3.22). (4) Remove the three screws 1 to detach the multipurpose tray top cover 2. (5) Remove the three screws 3 (two of them are black) and the connector to detach the multipurpose

tray 4.

(6) Disengage A and B at both sides of the assembly to detach the multipurpose tray cover Assy

5 (at the same time, the links 7 become detached).

(7) Unhook and detach the multipurpose tray drive gear 8.

Figure 3-3-14 Multipurpose Tray Assy/ Multipurpose Tray Cover Assy/ Links/ Multipurpose Tray Top

Cover/ Multipurpose Tray Drive Gear

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3.3.15 Drum Contact Assys (1) Insert a flatblade screwdriver between the printer case and the drum contact Assy 1 to demount

the drum contact Assy 1.

Figure 3-3-15 Drum Contact Assys

41316401TH Rev.4 65 /

Page 66

3.3.16 Registration Roller Assy (A)/ Registration Drive Gear (A) (1) Remove the left side cover (see section 3.3.12).

(2) Remove the right side cover (see section 3.3.13). (3) Remove the multipurpose tray (see section 3.3.14). (4) Remove the four screws 1 to demount the registration roller Assy (A) 2. (5) Remove the E ring 3 to detach the registration gear (A) 4.

Figure 3-3-16 Registration Roller Assy (A)/ Registration Driver Gear (A)

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3.3.17 Registration Roller Assy (B) (1) Remove the cassette Assy.

(2) Open the front cover. (3) Remove the right side cover (see section 3.3.13). (4) Remove the left plate Assy (see section 3.3.22). (5) Remove the registration clutch (see section 3.3.18). (7) Unscrew the four screws 1, and pull out the registration Assy (B) 1 in the arrow direction.

Figure 3-3-17 Registration Roller Assy (B)

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3.3.18 Registration Clutch and Registration Motor Assy (1) Remove the left side cover (see section 3.3.12).

(2) Remove the left plate Assy (see section 3.3.22). (3) Remove the connector and the E ring 1, then remove the two screws 3, the earth 4 and the

registration clutch 2.

(4) Remove the connector to remove the two screws 5 and the registration motor Assy 6.

Figure 3-3-18 Registration Clutch and Registration Motor Assy

41316401TH Rev.4 68 /

Page 69

3.3.19 Main Cooling Fan (1) Unhook the connector (1), and remove the screw (2) and the cooling fan (3).

Note!

When attaching the cooling fan, observe its correct orientation.

Figure 3-3-19 Main Cooling Fan

Outlet

41316401TH Rev.4 69 /

Page 70

3.3.20 Color Registration Sensor Assy (1) Remove the two screws 1 and the two connectors to demount the color registration sensor

Assy 2.

(2) Remove the earth plate B 3.

Connectors

Figure 3-3-20 Color Registration Sensor Assy

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Page 71

3.3.21 Duplex Guide Assy (1) Unlatch and demount the duplex guide 1.

Main chassis (rear)

Figure 3-3-21 Duplex Guide Assy

41316401TH Rev.4 71 /

Page 72

3.3.22 Electrical Chassis Cooling Fan (1) Unscrew the screws 1 to remove the plate A 2.

(2) Unscrew the screws 3 to remove the shield plate B 4. (3) Remove the printer engine controller PWB (see section 3.3.30). (4) Unscrew the screws 5 to remove the shield plate 6. (5) Unscrew the screws 7 to demount the electrical chassis cooling fan 8.

Outlet

Figure 3-3-22 Electrical Chassis Cooling Fan

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3.3.23 Printer Engine Controller PWB (1) Remove the right side cover (see section 3.3.13).

(2) Remove the left plate Assy (see section 3.3.22). (3) Remove the five screws 1 and all the connectors to demount the printer engine controller

PWB 2.

Figure 3-3-23 Printer Engine Controller PWB

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Page 74

3.3.24 Printer Unit Chassis (1) Unscrew the two screws 1 and remove the AC inlet 2.

(2) Unscrew the four black screws 3 and five screws 4 to detach the printer unit chassis 5. (3) Unscrew the four black screws 6 and remove the left top cover spring Assy 7. (4) Unscrew the four black screws 8 and remove the right top cover spring Assy 9.

Figure 3-3-24 Pinter Unit Chassis

41316401TH Rev.4 74 /

Page 75

3.3.25Entrance Cassette Sensor Actuator (1)Remove the printer unit chassis (see section 3.3.24).

(2)Turn over the main chassis. (3)Remove the two clamps with needlenose pliers to detach the entrance cassette sensor actuator 1.

Main chassis

Figure 3-3-25 Entrance Cassette Sensor Actuator

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3.3.26Entrance Sensor PWB (1)Remove the registration roller Assy (B) (see section 3.3.17).

(2)Remove the two screws 1 to detach the entrance sensor PWB 2.

Figure 3-3-26 Entrance Sensor PWB

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3.3.27 Entrance MT Sensor Actuator and Entrance Belt Sensor Actuator (1) Remove the entrance sensor PWB (R71) (see section 3.3.26).

(2) Unlatch and detach the entrance MT sensor actuator 1. (3) Unlatch and detach the entrance belt actuator 2.

Figure 3-3-27 Entrance MT Sensor Actuator and Entrance Belt Sensor Actuator

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Page 78

3.3.28 Fuser Exit Roller (1) Unscrew the two screws 1 to remove the duplex gate solenoid Assy 2.

(2) Unscrew the screw 3 to remove the fuser exit roller contact 4. (3) Remove the fuser drive gear -A 5 and fuser drive gear -A 6. (4) Unscrew the screw 7 to remove the fuser drive gear -C 8. (5) Unlatch and detach the fuser drive gear -B 9 and fuser exit roller bush (R) 0. (6) Unlatch and detach the fuser exit roller bush (L) A and fuser exit roller B.

Figure 3-3-28 Fuser Exit Roller

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Page 79

3.3.29Exit Sensor Assy (1)Remove the fuser exit roller (see section 3.3.28).

(2)Remove the screw 1 and connector to detach the (red and blue) exit sensor Assy 2.

Figure 3-3-29 Exit Sensor Assy

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Page 80

3.3.30 Fuser Latching Handle (L) (1) Remove the latching handle spring 1.

(2) Unscrew the screw 2 to detach the fuser latching handle (L) 3.

Figure 3-3-30 Fuser Latching Handle (L)

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3.3.31Belt Motor Assy (1)Remove the fuser latching handle (R) (see section 3.3.32).

(2)Remove the two screws 1 to detach the two connectors 2. (3)Detach the blt motor Assy 3.

Figure 3-3-31 Belt Motor Assy

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3.3.32 Fuser Latching Handle (R) (1) Remove the printer unit chassis (see section 3.3.24).

(2) Remove the E ring 1. (3) Remove the fuser latching handle spring 2 to detach the fuser latching handle (R) 3.

Figure 3-3-32 Fuser Latching Handle (R)

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3.3.33Main Motor Assy (1)Remove the belt motor Assy (see section 3.3.31).

(2)Remove all the connectors. (3)Remove the four screws 1 to detach the main motor Assy 2.

Figure 3-3-33 Main Motor Assy

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Page 84

3.3.34 Main Feeder Drive Motor (1) Remove the two screws 1 to detach the main feeder drive motor 2.

(2) Unscrew the screw 3 to remove the main feeder drive motor bracket 4. (3) Remove the main feeder drive motor gears A 5 and B 6.

Figure 3-3-34 Main Feeder Drive Motor

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Page 85

3.3.35 Contact Assy/ Left Plate Assy (1) Remove the printer unit chassis (see section 3.3.24).

(2) Remove the four screws 1 to detach the left plate Assy 2. (3) Remove the screw 3 to detach the contact Assy 4.

Figure 3-3-35 Contact Assy/ Left Plate Assy

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Page 86

3.3.36Low Voltage Power Supply (1)Remove the printer unit chassis (see section 3.3.24).

(2)Unhook the connector 1. (3)Unscrew the screw 2 to remove the earth cable 3. (4)Unscrew the six screws 4 to detach the low voltage power supply 5.

Figure 3-3-36 Low Voltage Power Supply

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3.3.37 High voltage power supply (1) Remove the contact Assy (see section 3.3.35).

(2) Unhook the connector of the high voltage power supply 2. (3) Remove the two screws 1 to detach the high voltage power supply (2) and the tape harness 3.

Figure 3-3-37 High Voltage Power Supply

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Page 88

3.3.38Main Feed Assy (1)Remove the printer unit chassis (see section 3.3.24).

(2)Remove the low voltage power supply and high voltage power supply (see sections 3.3.36 and

3.3.37). (3)Unscrew the five screws 1 to remove the lower plate 2. (4)Unscrew the four screws 3 to detach the main feed Assy 4. (5)Unhook and remove the main feed drive gear 5.

Figure 3-3-38 Main Feed Assy

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3.3.39 Cassette/ Left Guide Assy (1) Remove the printer unit chassis (see section 3.3.24).

(2) Remove the main feed Assy (see section 3.3.38). (3) Remove the three screws 1 to detach the left cassette guide Assy 2. At the same time, the

earth plate 3 becomes detached.

(4) Remove the cassette lift spring 4, then remove the plastic slide 5, the cassette lift arm (L) 6

and the plastic roller 7. (5) Remove the two feet 8. (6) Remove the cassette lock spring 9, then remove the cassette lock 0.

Figure 3-3-39 Cassette/ Left Guide Assy

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Page 90

3.3.40 Cassette/ Right Guide Assy (1) Remove the printer unit chassis (see section 3.3.24).

(2) Remove the main feed Assy (see section 3.3.38). (3) Remove the five screws 1 to detach the right cassette guide Assy 2. At the same time, the

earth plate 3 becomes detached.

(4) Remove the cassette lift spring 4, then detach the plastic slide 5, the cassette lift arm (L) 6

and the plastic roller 7. (5) Unscrew the screw 8 to remove the paper size actuator 9. (6) Unscrew the screw 0 to remove the paper size sensing PWB A in the downward direction. (7) Remove the two feet B. (8) Remove the cassette lock spring C, then remove the cassette lock D. (9) Unscrew the two screws E to remove the 2nd tray connector F. (10)Unscrew the screw G, then remove the duplex Assy ground contact H.

Figure 3-3-40 Printer Tray/ Right Guide Assy

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3.3.41 Fuser Unit (1) Open the top cover 1.

(2) Push the right and left fuser levers (blue) 2 in the arrow direction to detach the fuser unit 3.

Figure 3-3-41 Fuser Unit

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Page 92

3.3.42 Belt Unit (1) Open the top cover 1.

(2) Remove the I/D unit. (3) Push the lever (blue) 2 in the arrow direction, raise the handle (blue) and detach the belt unit

Handle (blue)

Figure 3-3-42 Belt Unit

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Page 93

3.3.43 Duplex Unit (1) Remove the cassette Assy, the front cover Assy and the front cover inner baffle.

(2) Unlatch the rear at the right and left, and pull the duplex unit 1 toward the front.

Latch

Figure 3-3-43 Duplex Unit

Latch

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Page 94

3.3.44 Guide Rails (L) and (R) (1) Remove the duplex unit (see section 3.3.43).

(2) Remove the six screws 1 to detach the guide rails (L) 2 and (R) 3.

Figure 3-3-44 Guide Rail (L), (R)

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Page 95

3.3.45 Duplex Transport Assembly (1) Turn over the duplex transport Assy.

(2) Unscrew the three screws 1 and five screws 2 to detach the plate 3. (3) Unplug the connector and detach the mold Assy 4. (4) Detach the two actuators 5. (5) Unscrew the screws 6 and 7 to remove the earth 8. (6) Unhook the connector and disengage the two claws to detach PCB-MOP 9. (7) Unplug the cable and, warping the claw, detach the transport sensor. (8) Unscrew the two screws to detach the cord duplex connector Assy. (9) Unscrew the screw 0 to remove the earth A. (10)Unscrew the screw B to remove the earth C. (11)Unscrew the screw D to remove the earth E. (12)Detach the bush F, gear G and bush H, then detach the roller I. (13)Unscrew the screw J to remove the earth K. (14)Detach the gear L and bush M. At the same time, the mini pitch belt N becomes detached. (15)Detach the gear O and bush P, then detach the roller Q. At the same time, the mini pitch belt

R becomes detached. (16)Unscrew the screw S to remove the earth T. (17)Remove the E ring U and three screws V to detach the motor Assy W. At the same time, the

earth X becomes detached. (18)Detach the gear Y and bush Z. (19)Detach the gear [, knock-pin \ and bush ], then detach the roller _. (20)Detach the bush a, gear b, knock-pin c and bush d, then detach the roller e. At the same

time, the earths f and g become detached. (21)Detach the idle roller shaft and the idle roller, then detach the idle roller springs (eight springs). (22) Remove the cable of the duplex transport sensor Assy from the claw of the cover-upper.

Disengage the claw, then detach the sensor.

41316401TH Rev.4 95 /

Page 96

]

[

Cord duplex

connector Assy

Duplex transfer Assy

41316401TH Rev.4 96 /

Figure 3-3-45 Duplex Transport Assembly

Duplex transport sensor × 2

Idle roller spring

Idle roller × 8

Idle roller shaft × 8

Page 97

3.3.46 CU Assy (1) Pulling out Controller Board

1. Undo the two screws 1.

2. Pull the controller board 2 out.

3. Place the controller board 2 on a flat table.

(2) Detaching Fan

1. Remove the connector 3.

2. Remove the two screws 4.

3. Detach the fan 5.

Figure 3-3-46 CU Assy (1/2)

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(3)Removing the CRM Board

1.Unscrew the four screws 6 to remove the fan bracket 7.

2.Unscrew the four screws 8 to remove the plate support 9 and the guide rail A 0.

3.Unscrew the two screws A to remove the guide rail B B.

4.Unscrew the two screws C and three screws D, then detach the CRM board E.

Figure 3-3-46 CU Assy (2/2)

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4. ADJUSTMENTS

Adjustments on the C7000 Series of printers are made by key entry on the operator panel. In addition to a standard menu, there is a maintenance menu in each printer. Select the one that serves the purpose of intended adjustment.

4.1 Maintenance Modes and Their Functions

4.1.1 Maintenance menu

The standard menu category includes the maintenance menu category. The followings can be set from this menu.

Maintenance Menu

Okidata C7000 Service Manual

CONTENTS