Okidata OKIPAGE 24DXn, Okipage 24DX Service Manual

Front Cover

Service Guide OKIPAGE 24DX/24DXn

Chapter 0 Introduction

Oki Data

Service Guide

OKIPAGE 24DX & 24DXn

Adobe Acrobat printable reference copy

of the OKIDATA Service Training Manual.

01/26/2000

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 OKIPAGE 24DX/24DXn

0 Introduction

Preface 1

1 Configuration

Configuration 2

....1.1 System Configuration 3

....1.2 Printer Configuration 4

....1.3 Optional Configuration

....1.4 Specification 5

....1.5 Safety Standards 6

........1.5.1 Certification Label 7

........1.5.2 Warning Label 8

2 Operation Description

2.0 Operation Description 9

2.1 Main Control Board (BOARD-FFF) 10

2.2 Power Supply Unit 11

2.3 Electro-photographic Process 12

....2.3.1 Electro-photographic process mechanism

....2.3.2 Electro-Photographic process 13

....2.3.3 Process operation descriptions 15

....2.3.4 Revision of LED Head Illumination

2.4 Paper Jam Detection 16

2.5 Cover Open 18

2.6 Toner Low Detection 17

2.7 Stacker-full Detection 19

2.8 Page Size Detection 14

3 Parts Replacement

Parts Replacements 20

....3.1 Precautions for Parts Replacement 21

....3.2 Parts Layout 22

........Figure 3-1 23

........Figure 3-2 24

........Figure 3-3 25

........Figure 3-4

....3.3 How to Change Parts 26

........3.3.1 Face-up Stacker Assy 27

........3.3.2 Contact Assy 28

........3.3.3 DC Fan Motor 29

........3.3.4 OP Panel Assy 30

........3.3.5 Board - FFF 31

........3.3.6 Stacker Assy, Damper Arm, Cover Rear 32

........3.3.7 Sensor Stacker Full 33

........3.3.8 Cable cover (guide film) 34

........3.3.9 Damper 35

........3.3.10 Feeder Unit - Front 36

........3.3.11 Roller Assy - Regist 37

........3.3.12 Motor - Main 38

........3.3.13 Guide Assy - Eject 39

........3.3.14 Heat Assy 40

........3.3.15 Roller feed (C) 41

........3.3.16 Roller Assy - BK 42

Table of Contents Page

........3.3.17 Roller Assy - Feed 43

........3.3.18 LED Head

........3.3.19 Paper cassette, ROLLER Assy - Feed, ROLLER

Assy - Hopping

........3.3.20 Frame Assy - Separation

........3.3.21 Transfer Roller / TR Gear / TR Bearing

........3.3.22 EP lock shaft

........3.3.23 LEVER Assy - Out Sensor

........3.3.24 Toner sensor lever

........3.3.25 Paper sensor lever

........3.3.26 Inlet sensor lever

........3.3.27 Power supply unit

........3.3.28 Lever-Paper end & Lever-Paper near end

........3.3.29 Guide Assy - Cassette (L)

........3.3.30 Guide Assy - Cassette (R)

........3.3.31 Removing/Installing Duplex Unit

........3.3.32 Board-LEX

........3.3.33 Connector (IMSA-9714N-14A)

........3.3.34 Photo Sensor

........3.3.35 SOLENOID Assy

........3.3.36 Motor

4 Adjustment

4.0 Adjustment 44

....4.1 Maintenance Modes and Functions 45

........4.1.1 User maintenance mode 46

........4.1.2 System maintenance mode 47

........4.1.3 Engine maintenance mode 47

........4.1.4 EEPROM initialization 47

....4.2 Adjustment When Replacing a Part 48

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

........4.2.2 Destination setting 50

........4.2.3 Setting of LED head drive time 50

5 Periodic Maintenance

5.1 Periodic Maintenance 51

5.2 Cleaning 52

....5.2.1 Cleaning the LED Lens Array 53

....5.2.2 Cleaning the Plastic Film 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 Flowchart 58

....6.5.1 Status Monitor Message List 59

....6.5.2 LCD message troubleshooting 61

........(1) The printer does not work normally after being turned

on.

........(2) Paper jams 63

............(2)-1 Paper input jam (1st tray) 63

............(2)-2 Paper input jam (front feeder) 63

Table of Contents Page

............(2)-3 Paper feed jam 63

............(2)-4 Paper exit jam 63

............(2)-5 Duplex INPUT JAM 63

............(2)-6 Duplex FEED JAM1 63

............(2)-7 Duplex FEED JAM2 63

............(2)-8 Duplex FEED JAM3 63

........(3) Paper size error 64

........(4) Fuser unit error (ERROR 71), (ERROR 72), (ERROR

73)

........(5) I/F time-out between printer and optional tray (ERROR

81)

........(6) I/F time-out between printer and Duplex Unit (ERROR

83)

........(7) I/F time-out occurs between the printer and the

operator panel (ERROR 80)

........(8) Message cannot be received through the parallel

interface

........(9) Message cannot be received through the serial

interface

........(10) Data cannot be received through the OKI HSP

interface

........(11) Synchronous serial I/O error (ERROR 74) 69

....6.5.3 Image Troubleshooting 61

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

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

........(3) Black paper is output 64

........(4) Black belts or stripes in the vertical direction 65

........(5) Cyclic error 66

........(6) Print voids 67

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

........(8) White belts or streaks in the vertical direction 69

........(9) Snowy print of high density pattern 69

........(10) Blotchy faded print 69

........Contents - Figure 6-5 70

........Contents - Figure 6-6 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 Power Supply Board (120V/230V) 75

....7.2.3 Power supply board (High voltage)

....7.2.4 LEX-PCB

....7.2.5 Flash ROM module (BOARD-FSL or BOARD-FSL-2)

7.3 Resistance Check

7.4 Program Font/ROM Location

8 Parts List

Figure 8-1 Printer Unit 76 Figure 8-2 Frame - Main Unit 77 Figure 8-3 Base Unit 77 Figure 8-4 Duplex Unit 77

A Centronics Parallel Interface

65 66 67 68 69 69 69

Table of Contents Page

Parallel Interface 81

B RS-232C Serial Interface

RS-232C Serial Interface 81

C Duplex Unit Maintenance

1. OUTLINE 94

....1.1 Functions 95

....1.2 External View and Component Names 96

2.0 Mechanism Description 97

....2.1 General Mechanism 98

....2.2 JAM Release Mechanism 99

....2.3 Removing/Installing Duplex Unit 100

3.0 Parts Replacement 101

....3.1 Precautions Concerning Parts Replacement 102

....3.2 Parts Layout 103

....3.3 Parts Replacement Methods 104

........3.3.1 Board-LEX 105

........3.3.2 Connector (IMSA-9714N-14A) 106

........3.3.3 Photo Sensor 107

........3.3.4 SOLENOID Assy 108

........3.3.5 Motor 109

4.0 Troubleshooting 110

....4.1 Precautions Prior to the Troubleshooting 111

....4.2 Preparations for the Troubleshooting 112

....4.3 Troubleshooting Method 113

........4.3.1 LCD Status Message List 114

........4.3.2 Troubleshooting Flow 115

5.0 Connection Diagram 116

....5.1 Interconnection Diagram 117

....5.2 PCB Layout 118

6.0 Parts List 119 Table 6-1 Duplex Unit 120

D Second / Third Paper Feeder Maint (option)

1.0 Outline 121

....1.1 Functions 122

....1.2 Appearance and Parts Name 123

2.0 Description of operation 124

....2.1 Driving Mechanism 125

....2.2 Hopper Mechanism 126

3.0 Parts Replacement 127

....3.1 Precautions Concerning Parts Replacement 128

....3.2 Parts Layout 129

....3.3 Parts Replacement Methods 130

........3.3.1 Roller assy hopping, Roller assy feed 131

........3.3.2 Cover front assy 132

........3.3.3 Board-BBB 133

........3.3.4 Lever paper end, Lever paper near end 134

........3.3.5 Motor 135

........3.3.6 Connector (IMSA-9714N-14B), Connector

(IMSA-9714N-14A)

........3.3.7 Frange pulley, pulley Idle, Mini pitch belt, Plate Earth

shaft, Gear double, Tray switch assy

136 137

Table of Contents Page

........3.3.8 Roller feed 138

........3.3.9 Bracket sub roller 139

........3.3.10 Frame side (L) assy 140

........3.3.11 Frame side (R) assy 141

4.0 Troubleshooting 142

....4.1 Precautions Prior to the Troubleshooting 143

....4.2 Preparations for the Troubleshooting 144

....4.3 Troubleshooting Method 145

........4.3.1 LCD Status Message List 146

........4.3.2 Troubleshooting Flow 147

5.0 Connection Diagram 148

....5.1 Interconnection Diagram 149

....5.2 PCB Layout 150

6.0 Parts List 151

E Multi Feeder Maint. (option)

1.0 Outline 152

....1.1 Functions 153

....1.2 External View and Component Names 154

2.0 Mechanism Description 155

....2.1 General Mechanism 156

....2.2 Hopper Mechanism 157

3.0 Parts Replacement 158

....3.1 Precautions Concerning Parts Replacement 159

....3.2 Parts Layout 160

....3.3 Parts Replacement Methods 161

........3.3.1 Separator 162

........3.3.2 AOLE-PCB 163

........3.3.3 Square-shaped connector 164

........3.3.4 Hopping Motor 165

........3.3.5 Planet gear 166

........3.3.6 Roller B 167

........3.3.7 Roller A 168

........3.3.8 Mini pitch belt & Feed roller 169

4.0 Troubleshooting 170

....4.1 Precautions Prior to the Troubleshooting 171

....4.2 Preparations for the Troubleshooting 172

....4.3 Troubleshooting Method 173

........4.3.1 LCD Status Message List 174

........4.3.2 Troubleshooting Flow 175

5.0 Connection Diagram 176

....5.1 Interconnection Diagram 177

....5.2 PCB Layout 177

6.0 Parts List 179

Page: 1

Service Guide OKIPAGE 24DX/24DXn

Chapter 0 Introduction

Preface

This maintenance manual describes the field maintenance methods for OKIPAGE 24DX & 24DXn. This manual is written for use by maintenance personnel. Note, however, that the user should refer to the USER'S

MANUAL for methods of handling and operating the equipment.

Page: 2

Service Guide OKIPAGE 24DX/24DXn

Chapter 1 Configuration

Configuration

System Configuration

Printer Configuration

Optional Configuration

Specification

Safety Standards

Page: 3

Service Guide OKIPAGE 24DX/24DXn

Chapter 1 Configuration

1.1 System Configuration

The OKIPAGE 24DX & 24DXn consists of control and engine blocks as the standard configuration (See Figure 1-1).

In addition, the following options are also available.

Figure 1-1

Service Guide OKIPAGE 24DX/24DXn

Chapter 1 Configuration

1.2 Printer Configuration

The printer unit consists of the following hardware components:

Electro-Photographic Processor l Paper Feeder l Controllerl Operator panell Power supply unitl

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

Page: 4

Page: 5

Service Guide OKIPAGE 24DX/24DXn

Chapter 1 Configuration

1.3 Optional Configuration

The options below are available for use with OKIPAGE 24DX / OKIPAGE 24DXn. They are sold separately from the printer unit.

1 Multi Feeder

2 Second / Third Paper Feeder

4 D-RAM SIMM module (72 pin

SIMM, 16 MB/32MB, EDO SIMM type)

(See 7.2 (1) for where to install).

5 Flash ROM module (72 pin SIMM,

4MB/8MB)

(See 7.2 (1) for where to install).

1.4 Specification

(1) Type: Desktop

Page: 6

Service Guide OKIPAGE 24DX/24DXn

Chapter 1 Configuration

(2) Outside dimensions

(excludes protruding

portion) (3) Weight 47 lbs. (21.3 kg) (4) Development method

Exposure method (5) Paper used <Type>

Height: 13.0" (331 mm) Width: 14.4" (366 mm) Depth: 18.2" (462 mm)

Dry electrophotography LED stationary head

Standard paperl

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

- Label

- Envelope

- OHP paper (Transparency)

<Size>

Standard sizesl

- Letter

- Legal

- Executive

- Envelope (with Duplex printing)

- A4

- A5 (without Duplex printing)

- B5 (without Duplex printing)

- A6 (without Duplex printing) Applicable sizesl

-Width: 3.4" to 8.5" (86 to 216 mm)

- Length: 5.5" to 14" (140 to 355.6 mm)

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

- Manual feed: Label, OHP paper (transparency), Envelope, 16~36

lb.

(6) Printing speed: First print: 8 seconds

Continuous print: 24 sheets/min. [at duplex print: 12 sheets/min] Warm-up time: 90 seconds (at room temperature 77o F (25o C) and

rated voltage (120 VAC) (7) Paper feeding method Automatic feed or manual feed (8) Paper delivery method Face down/face up

(9) Resolution 600 dpi x 600 dpi (default)

600 x 1200 dots/inch (10) Power input 120 VAC +5.5%, -15%

230 VAC +10% (11) Power consumption Peak: Approx. 820W

Typical operation: Approx. 350W

Idle: Approx. 95W

Power save mode: Approx. 25W (12) Temperature and

humidity

In operation Power off mode During Storage Unit

Temperature 50 - 90

(10-32)

32-110

(0-43)

14-110

(-10 - 43)

Humidity 20 - 80 10-90 10-90 % RH Maximum wet bulb temperature

Minimum difference of wet and dry bulb

(25)

35.6 (2)

80.4

(26.8)

35.6 (2)

-------

temperature

(oC)

Notes:

1. Storage conditions specified above apply to printers in packed condition.

2. Temperature and humidity must be in the range where no condensation occurs.

(13) Noise During operation: 55 dBA or less

At standby: 45 dBA or less Power save mode: 43 dBA or less

(14) Consumables Toner cartridge kit - 6,000 (5% duty)

Image drum cartridge - 30,000 (at 5% density, continuous printing); 19,000 pages (3 page/job) (Simplex printing*)

* Simplex printing without Power Save.

Page: 7

Service Guide OKIPAGE 24DX/24DXn

Chapter 1 Configuration

1.5 Safety Standards

1.5.1 Certification Label

1.5.2 Warning Label

Service Guide OKIPAGE 24DX/24DXn

Chapter 1 Configuration

1.5.1 Certification Label

The safety certification label is affixed to th eprinter in the position below.

Page: 8

Page: 9

Service Guide OKIPAGE 24DX/24DXn

Chapter 1 Configuration

1.5.2 Warning Label

The warning label is affixed to the portion which may cause an injury to human body. Follow the instructions on warning labels during maintenance.

Page: 10

Service Guide OKIPAGE 24DX/24DXn

Chapter 2 Operation Description

2.0 Operation Description

OKIPAGE 24DX & 24DXn consists of a main control board, power supply unit (120V/230V), power supply unit (high voltage) and operator panel and an electro-photographic process mechanism.

The control board receives data through a host I/F, decodes and edits the data, and stores the edited data in a memory. After completing edition of one page of data, it references the font memory and generates bit data on the same memory. At the same time, it transfers the bit image data to an LED head in units of one dot line.

The electro-photographic process mechanism prints data on paper. The operator panel is used for operations and status display. Fig. 2-1 shows an OKIPAGE24DX / OKIPAGE 24DXn block diagram.

Figure 2-1 OKIPAGE 24DX block diagram

Page: 11

Service Guide OKIPAGE 24DX/24DXn

Chapter 2 Operation Description

2.1 Main Control Board (BOARD-FFF)

The main control board consists of a one-chip CPU, LSI, program/font ROM's, DRAM's, EEPROM, host interface circuit, and a mechanism driving circuit.

(1) One-chip CPU The one-chip CPU is a custom CPU (32-bit internal bus, 32-bit external bus, 120-MHz clock) that

incorporates an RISC CPU and its peripheral devices, and has the following functions.

Built-in Device Function

Chip select controller Bus controller DRAM controller

DMA controller Transfer of data Host I/F to RAM Serial interface controller Control of RS232C serial interface. Parallel interface controller Control of Centronics parallel interface. Timer Generates various control timings for monitoring paper

Serial I/O port Inputting of various signals

I/O port Inputs and outputs the sensor signals and motor signals, etc.

Motor driver controller Control of Main Motor. Image processing circuit Executes the image data process for printing.

(2) Program/font ROM's

Control peripheral LSI, ROM, DRAM and I/O device.

feeding and a paper size.

Outputting of various control signals

Also performs I/O for EEPROM.

PCL ROMl The program/font ROM's store the HP LJ5 emulation program and various types of font. MASK ROM is used as the program/font ROM's. PS ROMl

The program/font ROM's store the Adobe PostScript Level 2 program and its fonts. (3) DRAM 16-Megabyte DRAM (64 Mbit DRAM x 2) is mounted as resident memory to be used for storing the

program and providing various buffers. This DRAM is expandable up to 128 Mbytes by adding expansion memory (SIMMs). This DRAM provides the areas shown in the following table.

Memory area Use Memory capacity setting

MENU Expansion RAM

System area Working area used for the program Fixed Fixed Raster buffer Stores converted bit image data Enable Expandable Receive buffer Stores temporarily the data

received from the host interface

Page buffer Adds print information to the

analyzed receive data and stored

the resulted data. DLL/macro buffer Font cache buffer

(4) EEPROM EEPROM has a 16-kbit capacity and stores the following data.

Menu data l Various counter data (page counter, drum counter, fuser counter, etc.)l Adjustment parameters (LED head drive time, print start position, etc.)l

(5) LSI (LZ9FF22)

Built in device Function

Serial I/O port Control of serial interface between controller and 2nd tray,

Motor drive controler Control of Hopping motor I/O Port Inputting of various sensor signals

Stores soft fonts and macro data. ---- Expandable

Stores bit map fonts generated by

the font rasterizer based on

scalable font information.

3rd tray, Multi purpose feeder Control of serial interface between controller and Duplex unit

Outputting if various control signals

Enable Expandable

---- Expandable

Enable Expandable

(6) Host interface This printer has the following interfaces to the host.

Centronics bidirectional parallel interfacel RS232C interfacel OKI HSP interface (Option)l

The single effective interface or the automatic interface select mode can be selected using the menu. If the busy state of the printer continues for a long time period, the buffer near-full control releases the busy status at constant intervals even if the host side is busy so not to cause the interface time-out at the host side.

(a) Centronics bidirectional parallel interface This is an interface conforming to IEEE-1284 and provides either of unidirectional and bidirectional

communications according to each of the following communication modes.

Compatibility model Unidirectional communications from the host to the printer.

Nibble model

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

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

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

(b) RS232C serial interface The following protocol is supported for the serial interface conforming to EIA RS232C.

READY/BUSY (DTR HI or DTR LO)l X-ON/X-OFFl

RBST X-ONl (For the electrical/ physical characteristics of the interface, see APPENDIX B) (c) OKI HSP interface (Option) This interface (slot) is an OKI unique universal interface that provides the platform to connect option

boards (including those supplied by third party venders) such as the LAN connection expansion board and SCSI expansion board.

Any expansion boards compatible with this interface can be mounted on the Control board in the piggyback board without modifying the program at the printer side. The conceptual diagram of the OKI HSP interface is shown in Figure 2-2.

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

(7) RAM module

Pin layoutl

Basic specificationl

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

[Note: EDO SIMM type]

- Access time: 60ns, 70ns, 80ns, 100ns

- Capacity: 16 or 32 MB

- Parity: None

(8) Flash ROM module

Pin layoutl

Basic specificationl

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

- Access time: 90ns

- Capacity: 4 or 8 MB

Page: 12

Service Guide OKIPAGE 24DX/24DXn

Chapter 2 Operation Description

2.2 Power Supply Unit

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

(1) Low voltage power supply circuit This circuit generates the following voltages.

Output voltage Use

+5 V Logic circuit supply voltage

+30 V Motor and fan drive voltage and source voltage for high-voltage supply

+8 V Reset circuit, RS232C Line voltage

-8 V RS232C Line voltage

+3.8 V LED HEAD supply voltage

(2) High voltage power supply circuit This circuit generates the following voltages necessary for electro-photographic processing from +30 V according to

the control sequence from the control board. When cover open state is detected, +30 V supply is automatically interrupted to stop the supply of all the high-voltage outputs.

Output Voltage Use Remarks

Sub-CH -15 uA Voltage applied to Sub charging roller CH -1.30 KV Voltage applied to charging roller DB -220 V+300 V Voltage applied to developing roller SB -450 V Voltage applied to toner supply roller TR +4 KV/-1.3 kV Voltage applied to transfer roller Variable + Only

CB +450 V-1350V Voltage applied to cleaning roller (3) Photosensor The photosensor mounted on this power supply unit supervises the paper running state during printing.

Figure 2-3 shows the sensor layout diagram.

Sensor Function Sensing state

Inlet sensor Detects the leading part of the paper and

gives the supervision timing for switching

ON: Paper exists

OFF: No paper exists from hopping operation to feeding operation. Supervises the paper running state and the paper size according to the paper reach time and running time.

Inlet sensor 2 Detects the form width. ON: A4 or larger

OFF: A4 or smaller

Paper sensor Detects the leading part of the paper.

Supervises the paper running state.

Outlet sensor Supervises the paper feed and size

according to the time of arrival to the sensor

ON: Paper exists

OFF: NO paper exists

ON: Paper exists

OFF: No paper exists and the time of passage of paper.

Toner low sensor Detects the lack of toner. ON long: Toner low exists

OFF short: No Toner low exists

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Okidata OKIPAGE 24DXn, Okipage 24DX Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual