Okidata OKIPAGE 8w Service Manual

Front Cover

Service Guide OKIPAGE8w

Chapter 0 Introduction

OKIPAGE 8w

LED PAGE PRINTER

Adobe Acrobat printable reference copy

of the OKIDATA Service Training Manual.

05/17/99

Note: This Adobe Acrobat version of the Okidata Service Training Manual was built with the pictures

rendered at 300 dpi, which is ideal for printing, but does not display well on most displays.

Table of Contents Page

Service Guide OKIPAGE8w

0 Introduction

Preface 1

1 Configuration

Configuration 2

....1.1 System Configuration 3

....1.2 Printer Configuration 4

....1.3 Specification 5

....1.4 Safety Standards 6

........1.4.1 Certification Label 7

........1.4.2 Warning Label 8

2 Operation Description

2.0 Operation Description 9

2.1 Main Control Board 10

2.2 Power Supply Unit 11

2.3 High-Voltage Power Supply Board 12

2.4 Electro-Photographic Processor 13

2.5 Electro-Photographic Process 14

....2.5.1 Explanation of Each Process Operation 15

2.6 Paper Jam Detection 16

2.7 Toner Low Detection 17

2.8 Cover Open 18

2.9 Detecting ID existence 19

3 Parts Replacement

Parts Replacements 20

....3.1 Precautions for Parts Replacement 21

....3.2 Parts Layout 22

........Upper Cover Assy 23

........Base Frame Unit 24

........Base Plate Unit 25

....3.3 Replacing Parts 26

........3.3.1 Hopper Plate 27

........3.3.2 LED Head and Head Spring 28

........3.3.3 Transfer Roller 29

........3.3.4 Upper Cover Assy 30

........3.3.5 High-Voltage Power Supply Board (P2H/P6L) 31

........3.3.6 Top Cover Assy and Flat Cable Assy 32

........3.3.7 Paper Holder 33

........3.3.8 Side Plate M and Idle Gear 34

........3.3.9 Heat Assy 35

........3.3.10 Drive Shaft E (Eject) and Eject Roller 36

........3.3.11 Pressure Roller B (Back Up Roller) 37

........3.3.12 Separator Guide 38

........3.3.13 Pulse Motor (Main) 39

........3.3.14 Hopping Shaft Assy 40

........3.3.15 Resist Roller 41

........3.3.16 Paper Sensor E, Paper Sensor Exit and Toner

Sensor Assy

........3.3.17 Base Plate 43

4 Adjustment

Table of Contents Page

4.0 Adjustment 44

....4.1 Adjustment Types and Functions 45

........4.1.1 Printer Driver 46

........4.1.2 Engine Maintenance Utility 47

....4.2 Adjustment When Replacing a Part 48

........4.2.1 Setting LED Head Drive Time 49

........4.2.2 Uploading and Downloading EEPROM Data 50

5 Periodical Maintenance

5.1 Periodical Replacement Parts 51

5.2 Cleaning 52

....5.2.1 Cleaning the LED Lens Array 53

6 Troubleshooting Procedures

6.1 Troubleshooting Tips 54

6.2 Check Points Before Correcting Image Problems 55

6.3 Notes When Correcting Image Problems 56

6.4 Preparation Before Troubleshooting 57

6.5 Troubleshooting 58

....6.5.1 Status Monitor Message List 59

....6.5.2 Status Message Troubleshooting 60

....6.5.3 Image Troubleshooting 61

........(1) An image is light or blurred entirely 62

........(2) Dark background density 63

........(3) A blank paper is output 64

........(4) Vertical black belt/stripe 65

........(5) Cyclic defect 66

........(6) A blank paper is output 67

........(7) Poor fusing 68

........(8) Vertical white belt/stripe 69

........Contents - Figure 6-4 70

........Contents - Figure 6-5 71

7 Wiring Diagram

7.1 Interconnect Signal Diagram 72

7.2 PCB Layout 73

....7.2.1 Main Control Board (HBY PCB) 74

....7.2.2 High-Voltage Power Supply Board 75

8 Parts List

Cover Assy Upper 76 Base Frame Unit 77 Heat Assy 78 Base Plate Unit 79

A Local Printing

Local Printing 80

B Parallel Interface

Parallel Interface 81

C Maintenance Utility

Outline of Maintenance Utility 82 Detail of Each Function 83

....4.1 Engine Menu Setting 84

....4.2 Engine Counter 85

....4.3 Printer Status 86

Table of Contents Page

....4.4 Test Print 87

....4.5 Option 88

....4.6 About 89

....4.7 Reload 90

.... 4.8 Exit 91

Page: 1

Service Guide OKIPAGE8w

Chapter 0 Introduction

Preface

This Service Handbook describes the field maintenance procedures for the OKIPAGE 8w.

This manual is written for use by service persons. Please note that you should refer to the Printer User's Manual for operating procedures.

Service Guide OKIPAGE8w

Chapter 1 Configuration

Configuration

System Configuration

Printer Configuration

Specification

Safety Standards

Page: 2

Page: 3

Service Guide OKIPAGE8w

Chapter 1 Configuration

1.1 System Configuration

The OKIPAGE 8w consists of a control block, a power supply unit, and an engine block. (See Figure 1-1 below.)

Figure 1-1

Service Guide OKIPAGE8w

Chapter 1 Configuration

1.2 Printer Configuration

The printer unit consists of the following five hardware components:

Electro-Photographic Processor l Paper Feeder l Main Control Board l High-Voltage Power Supply Board l Power Supply Unitl

Figure 1-2 is the configuration of the printer unit.

Page: 4

Figure 1-2

1.3 Specification

(1) Type: Desktop

Page: 5

Service Guide OKIPAGE8w

Chapter 1 Configuration

(2) Outside dimensions

(excludes protruding

portion) (3) Weight 9.3 lbs. (4.2 kg) (4) Development method

Exposure method (5) Paper used <Type>

(6) Printing speed: First print: 23 seconds (A4) (after warm-up)

Height: 5.9" (150 mm) Width 12.2" (310 mm) Depth 7.5" (191mm)

Dry non-magnetic development system LED stationary head

Standard paperl

- Xerox 4200 (20 lbs) Application paper (manual face-up feed)l

- Label

- Envelope

- OHP paper (Transparency)

<Size> 14" (355.6 mm) (Max.) x 8.5" (215.9 mm)

<Thickness> Automatic feed: 16 to 28 lbs (60 to 105 g/m2)

- Manual feed: Label, Envelope, OHP paper (transparency)

Continuous print: 8 sheets/minute (A4) Warm-up time: 40 seconds (120 VAC for ODA, 230 VAC for

OEL/INT) (at room temperature 77o F (25o C) (7) Paper feeding method Automatic paper feed or manual paper feed (8) Paper delivery

method

(9) Resolution 600 dpi x 600 dpi (true) (10) Power input 230 VAC +/-10% (for OEL/INT)

(11) Power consumption Peak: Approx. 450W

(12) Temperature and

humidity

Face down

120 VAC +/-15% for (ODA)

Typical operation: Approx. 100W

Idle: Approx. 30W

Power save mode: Approx. 5W

Temperature Humidity

During operation In storage

10 to 32o C

-10 to +43o C

20 to 80% RH (relative humidity) 10 to 90% RH (relative humidity)

No condensation is permissible.

Caution: Temperature and humidity in storage are measured with the OKIPAGE 8w being packed; they are valid for one year.

(13) Noise During operation: 48 dB (A) or less

Standby: 38 dB (A) or less (14) Consumables Toner cartridge kit - 1,500 (5% duty) ---- 45g cartridge kit

Image drum cartridge - 10,000 (at continuous printing)

Service Guide OKIPAGE8w

Chapter 1 Configuration

1.4 Safety Standards

1.4.1 Certification Label

1.4.2 Warning Label

Page: 6

Service Guide OKIPAGE8w

Chapter 1 Configuration

1.4.1 Certification Label

The safety certification label is affixed to the following location of the OKIPAGE 8w:

Page: 7

Service Guide OKIPAGE8w

Chapter 1 Configuration

1.4.2 Warning Label

Warning labels are affixed to the locations that may cause bodily injury. During maintenance, do work with enough care while following instructions on these warning labels.

Page: 8

Page: 9

Service Guide OKIPAGE8w

Chapter 2 Operation Description

2.0 Operation Description

The OKIPAGE 8w consists of a main control board, a high-voltage power supply board, a power supply unit, and an electro-photographic processor. The OKIPAGE 8w receives print data from a higher-level interface and sequentially stores it in memory. The OKIPAGE 8w decodes and edits the received data while storing print data from the interface in memory. It sequentially transfers the edited data to the LED head for each dot line. The electro-photographic processor then prints the data on sheets of paper.

The display of the higher-level host is used for device operation and status display. Figure 2-1 is the block diagram of the OKIPAGE 8w.

Figure 2-1 Block Diagram

Page: 10

Service Guide OKIPAGE8w

Chapter 2 Operation Description

2.1 Main Control Board

The main control board consists of a one-chip CPU, a program ROM, a DRAM, an EEPROM, a host interface circuit, and a mechanism driving circuit. The mechanism driving circuit consists of an LED head, a main motor, and an electromagnetic clutch.

(1) One-chip CPU The one-chip CPU is a custom CPU (8-bit internal bus, 8-bit external bus, 10-MHz clock) incorporating

mask ROM and CPU peripheral devices. This CPU has the functions listed in the table below.

Built-in Device Function

DRAM controller Controls DRAM. DMA controller Transfers image data from Parallel I/F to DRAM, from

DRAM to a video output port and between CPU and DRAM. Parallel interface controller Controls the parallel interface. Video output port

LED STB output port Timer Generates various control timings for monitoring paper

I/O Port Inputs and outputs the sensor signals and motor signals,

A/D converter Inputs the feedback signals from a high-voltage generation

(2) Program ROM Program ROM contains a program for the equipment. EPROM is used as program ROM. When mask

ROM in the one-chip CPU explained in (1) above is valid, the EPROM is not mounted. (For details on short wiring setting, see Section 7.2.)

(3) DRAM DRAM is used as resident memory. (4) EEPROM

Controls LED head.

feeding and a paper size.

etc. Also performs I/O for EEPROM.

circuit and thermistor signal.

EEPROM holds the following data:

Menu data l Counter value l

Adjustment valuel (5) Parallel interface The parallel interface receives parallel data from the host; it conforms to the IEEE1284 specification.

Service Guide OKIPAGE8w

Chapter 2 Operation Description

2.2 Power Supply Unit

The power supply unit supplies +5 V and +26 V to the main control board according to 230 VAC / 120 VAC.

Output voltage Application

+5 V Used to generate a logic circuit and a high voltage.

+26 V used to drive the motor and electromagnetic clutch.

Page: 11

Page: 12

Service Guide OKIPAGE8w

Chapter 2 Operation Description

2.3 High-Voltage Power Supply Board

(1) High-Voltage power supply circuit The high-voltage power supply circuit generates the following voltages required for the electro-photographic processor

from +5 V according to the control sequence from the main control board. When the cover is open, +5 V supply is automatically interrupted to stop high-voltage output.

Output Voltage Application

CH -1.3 KV Voltage to be applied to charge roller. DB -265 V/+265 V Voltage to be applied to a developing roller. SB -520 V/ 0 V Voltage to be applied to a sponge roller. CB +400 V/-1.3 KV Voltage to be applied to a cleaning roller. TR +500 V ~ +3.5 KV/-750 V Voltage to be applied to a transfer roller.

Caution: The TR voltage varies with medium and transfer roller impedance.

(2) Sensors The high-voltage power supply board consists of the high-voltage power supply circuit that supplies power to the

electro-photographic processor system and the photosensor that detects a paper feeding system and toners. Figure 2-2 shows the sensor layout drawing.

Sensor Function Sensing State

Manual feed sensor Monitors whether paper was inserted into the

manual feed sensor section.

Paper sensor Detects the leading part of the paper. Monitors

paper feeding.

Output sensor Monitors paper feeding and the paper size

according to the paper sensor arrival and passing

ON: Paper exists. OFF: No paper exists.

time.

Toner sensor Detects the low toner status. ON (long): Toner low.

OFF (short): Toner high.

Page: 13

Service Guide OKIPAGE8w

Chapter 2 Operation Description

2.4 Electro-Photographic Processor

The electro-photographic processor prints out the image data to be sent from the main control board on sheets of paper. Figure 2-3 shows the layout drawing of the electro-photographic processor.

(1) Image drum unit The image drum unit makes a toner adhere to the formed electrostatic latent image with static electricity. This

electrostatic latent image is formed by the lights irradiated from LED heads. (2) Electromagnetic clutch The electromagnetic clutch controls the rotation of the hopping roller according to signals from the control block.

(3) Pulse motor (Main) This pulse motor of 48 steps/rotation is two-phase excited by the signal from the main control board; it performs feeding

control by switching normal rotation to reverse rotation or vice versa and turning on/off the electromagnetic clutch. The relationship between the main motor, electromagnetic clutch, resist gear, drum gear, hopping roller is shown in the table below and on the subsequent pages.

Main Motor Electromagnetic

Clutch

Hopping Roller Regist Gear Drum Gear Operation

Normal rotation OFF Non-rotation Non-rotation Rotation Warm-up Reverse rotation ON Rotation Rotation Rotation Hopping Reverse rotation OFF Non-rotation Rotation Rotation Printing

(4) LED head The shift and latch registers receive image data from the main control board for each dot line. 4,992 LEDs are driven to

radiate the image drum. (5) Heat Assy The heat Assy consists of a heater, a heat roller, a thermistor, and a thermostat. The power supply unit supplies AC voltage to the heater according to the HEATON signal from the main control board to

heat the heat roller. The main control board monitors the heat roller temperature via the thermistor and keeps the temperature constant by turning on/off the heater AC voltage supply.

If the heat roller temperature rises abnormally, the thermostat of the heater voltage supply circuit functions to forcibly suspend the AC voltage supply.

Roller control by pulse motor (main)

(1) Normal rotation of pulse motor (main): Drum roller, transfer roller, cleaning roller, CH roller,

developing roller, heat roller, exit roller rotation.

(2) Reverse rotation of pulse motor (main): Drum roller, transfer roller, cleaning roller, CH roller,

developing roller, heat roller, exit roller, feed roller, hopping roller rotation. Hopping operation from the tray, however, is performed when the electromagnetic clutch is turned on.

Service Guide OKIPAGE8w

Chapter 2 Operation Description

2.5 Electro-Photographic Process

(1) Charging - The surface of the OPC drum is charged negatively and uniformly by applying the DC

voltage to the CH roller.

(2) Exposure - Light emitted from the LED head irradiates the negatively charged surface of the OPC

drum. The surface potential of the irradiated surface attenuates to form the electrostatic latent image corresponding to the image signal.

(3) Development and residual toner recovery - The negatively charged toner is brought into contact with

the OPC drum, adhering to the electrostatic latent image on the OPC drum by static electricity. This adhesion causes the electrostatic latent image to change to a visible image. At the same time, the residual toner on the OPC drum is attracted to the developing rollerby static electricity.

(4) Transfer - When paper is placed over the image drum surface, the positive charge which is opposite

in polarity to that of the toner, is applied to the reverse side by the transfer roller. The toner is attracted by the positive charge and is transferred onto the paper. This results in the transfer of the toner image formed on the image drum onto the paper.

(5) Cleaning - The cleaning roller temporarily attracts the residual toner on the transferred OPC drum

with static electricity, then returns the toner to the OPC drum.

Page: 14

(6) Fusing - The transferred unfused toner image is fused to a sheet of paper by applying heat and

pressure to the image.

Figure 2-5 shown below is a flow for the electro-photographic process.

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Okidata OKIPAGE 8w Service Manual

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