Oki ML520 Manuel utilisateur

Page: 1

Service Guide ML520/521

Chapter 0 About This Manual

ML520 // ML521

Dot Matrix Printers

Adobe Acrobat printable reference

copy of the OKIDATA Service Training Manual.

09/17/97

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 view on most

displays well.

Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

Table of Contents Page

Service Guide ML520/521

0 About This Manual

Front Cover 1

1 Product Specifications

1.1.01 General Information 3

....1.2 Physical Specifications 4

....1.3 Power Requirements 5

....1.4 Environmental Conditions 6

....1.5 Agency Approvals 7

....1.6 Operational Specifications 8

....1.7 Paper Specifications 9

....1.8 Memory Specifications 10

....1.9 Consumables 11

....1.10 Options - Cut Sheet Feeders 12

........1.10.02 Pull Tractor Kit 13

........1.10.04 Bottom Push Tractor Kit 14

........1.10.05 Serial Interface 15

........1.10.06 Roll Paper Stand 16

........1.10.08 OKISmart Typer Utility 17

....1.11 Reliability 18

2 Principles of Operation

2.1 Electrical Operation 19

....2.1.01 Main Control Board 20

........Block Diagram 21

........Program ROM 22

........RAM 23

........LSI 24

........Electrically Erasable Programmable Read Only Memory

(EEPROM) 25

....2.1.02 Initialization 26

....2.1.03 Parallel Interface Control 27

....2.1.04 Print Control 28

........LSI/Printhead Interface 29

........Gap Adjust Control 30

........Print Compensation Control 31

....2.1.05 Space and Line Feed (SP/LF) Motor Control 32

........Line Feed Motor Control 33

........Space Motor Control 34

........Encoder Disk 35

....2.1.06 Operation Panel 36

....2.1.07 Alarm Circuit 37

........Low Motor Drive Voltage Alarm 38

Table of Contents Page

........Head Drive Time 39

........Print Speed 40

........%Head Overheat Alarm Processing 41

....2.1.08 Power Supply Circuit 42

2.2 Mechanical Operation - Printhead Mechanism 43

........Printhead Gap Information 44

........Interconnect Diagram: Control Board to Printhead 45

........Line Feed Motor Resistance 46

........Space Motor Resistance 47

........Printhead Operation 48

........Printhead Temperature 49

....2.2.02 Spacing Mechanism 50

........Spacing Operation 51

....2.2.03 Head Gap Mechanism 52

........Ribbon Drive Operation 53

....2.2.05 Line Feed Mechanism 54

........Cut Sheet/Continuous Sheet Switching Mechanism 55

........Cut Sheet Paper Feed Operation 56

........Continuous Paper Feed (Rear Tractor Mechanism) 57

........Continuous Paper Feed (Pull Tractor Mechanism) 58

........Continuous Paper Feed (Bottom Tractor Feed

Mechanism) 59

........Continuous Paper Feed (Push/Pull Tractor Mechanism) 60

....2.2.06 Paper Detection Mechanism 61

....2.2.07 Support Protector Mechanism 62

....2.2.08 Automatic Paper Load 63

........Continuous Feed Paper 64

....2.2.09 Paper Park 65

3 Maintenance & Disassembly

....3.1.01 General Information 66

....3.1.02 Maintenance Tools 67

....3.1.03 Maintenance Precautions 68

3.2 Disassembly/Assembly Procedures 69

....3.2.01 Preliminary Items 70

....3.2.02 Printhead Assembly 71

....3.2.03 Ribbon Protector 72

....3.2.04 Gear Case Assembly 73

....3.2.05 Pull-up Roller Assembly 74

....3.2.06 Upper Cover, Access Cover, and Sheet Guide

Assemblies 75

....3.2.07 Control Board (FJIM) 76

....3.2.08 Power Supply Assembly 77

....3.2.09 Operator Panel PCB (LEOP) 78

....3.2.10 PC Connector 79

Table of Contents Page

....3.2.11 Space Motor and Roller Guide Assemblies 80

....3.2.12 Carriage Cable 81

....3.2.13 Space Rack 82

....3.2.14 Roller/Holder Backup Assembly 83

....3.2.15 Guide Rail and Adjust Cam 84

....3.2.16 Left Ground Plate 85

....3.2.17 Right Ground Plate 86

....3.2.18 Rear and Cut Sheet Paper Feed Sensor Levers 87

....3.2.19 Platen Assembly 88

....3.2.20 Paper Chute Assembly 89

....3.2.21 Line Feed Motor Assembly 90

....3.2.22 Reset Spring 91

....3.2.23 Idle Gear and Change Lever 92

....3.2.24 Pressure Spring 93

....3.2.25 Carriage Shaft 94

....3.2.26 Leaf Spring 95

....3.2.27 Bottom Paper Sensor Levers 96

....3.2.28 Front Pressure Roller Assembly 97

....3.2.29 Tractor Assembly 98

....3.2.30 Main Frame 99

3.3 Printer Adjustments 100

....3.3.02 Printhead Gap Adjustment 101

....3.3.03 Key Combinations 102

....3.3.04 Menu Operation 103

........Menu Settings 104

....3.3.05 Top of Form 105

....3.3.06 Paper Park 106

....3.3.07 Tear Feature 107

....3.3.08 Forms Tear Off 108

....3.3.09 Resets 109

3.4 Cleaning 110

3.5 Lubrication 111

3.6 Shipping Instructions 112

4 Failure & Repair Analysis

....4.1.01 Introduction 113

....4.1.02 Printer Serial Number Identification 114

....4.1.03 Firmware Revision Identification 115

4.2 Reporting Problems - General Information 116

....4.2.02 Problem Lists 117

....4.2.03 Reporting Methods 118

4.3 Troubleshooting Updates 119

4.4 Troubleshooting Tips 120

....4.4.02 Problem Categories 121

....4.4.03 START HERE Flowchart 122

Table of Contents Page

....4.4.04 Tips for Preventing Image Problems 123

....4.4.05 Common Problems 124

4.5 Abnormal Output - Output Samples 125

....Left Margin Drifting Problem 126

4.6 Fault Alarms 127

....4.6.02 ALARM/LED Display Troubleshooting Table Index 128

....4.6.03 ALARM/LED Display Troubleshooting Tables 129

4.7 Repair Analysis Procedures (Raps) 130

....4.7.02 RAP Index 131

........RAP 01 No Power Supplied to Printer 132

........RAP 02 No Spacing Operation 133

........RAP 03 Printhead Homing Error 134

........RAP 04 Paper Jam During Paper Loading 135

........RAP 05 Printhead Pins Not Firing 136

........RAP 06 Poor Print Quality 137

........RAP 07 Ribbon Feed Problem 138

........RAP 08 Line Feed Problem 139

........RAP 09 Operation Panel Malfunction 140

........RAP 10 Parallel Interface Problem 141

........RAP 11 Serial Interface Problem 142

4.8 Printer Tests 143

....4.8.02 Rolling ASCII Test 144

....4.8.03 Font Test 145

....4.8.04 Serial Interface Loopback Test 146

........Serial Cable Information 147

........Serial Interface Signal Requirements 148

........Commonly Used Serial Cable Configurations 149

....4.8.05 Hexadecimal Dump Mode 150

4.9 Resistance Checks 151

........Layout Diagram 152

....4.9.02 Printhead 153

....4.9.03 Line Feed Motor Resistance 154

....4.9.04 Space Motor Resistance 155

A Reference Charts

A.1 Overview - A.1.01 General Information 156

A.2 Index To Charts 157

........Board Layout 158

....A.2.01 Main Controller Board (FJIM) 159

....A.2.02 Operator Panel Board (LEOP) 160

....A.2.03 Power Supply Assembly 161

....A.2.04 Space Motor Board 162

....A.2.05 RS232-C Serial Interface Board - Option (LXHI) 163

B Illustrated Parts Listing

B.1 Overview - B.1.01 General Information 164

Table of Contents Page

........Format 165

........Current Part Numbers 166

....B.1.02 Definition of Terms 167

....B.1.03 Parts Ordering Information 168

B.2 Charts 169

........Overview 170

....B.2.01 Printer 171

....B.2.02 Upper Cover Assembly 172

....B.2.03 Printer General Assembly 173

....B.2.04 Printer Unit 174

....B.2.05 Printer Unit 175

....B.2.06 Printer Unit 176

....B.2.07 Carriage Assembly 177

....B.2.08 Options 178

....B.2.09 Option Parts 179

....B.2.10 Consumables 180

....B.2.11 Packing Materials 181

....B.2.12 Documentation 182

....B.2.13 Service Training Kit Revision List 183

Page: 2

Service Guide ML520/521

Chapter 0 About This Manual

This document may not be reproduced without the written permission of the Okidata Technical

Training Group. Every effort has been made to ensure the accuracy of the information contained

in this training course. Okidata is not responsible for errors beyond its control.

First Edition February, 1993 P/N 59257801

Second Edition September, 1993 P/N 59257802

Third Edition December, 1994 P/N 59257803

Written and produced by the Okidata Technical Training Group

Please address any comments on this publication to:

Technical Training Group

Okidata

532 Fellowship Road

Mount Laurel, NJ 08054-3499

Fax Number: (609) 235-2600, ext. 7034

Okilink Login Name: Technical Training

OKIDATA is a registered trademark of Oki Electric Industry Company, Ltd.; marques deposee de

Oki Electric Industry Company, Ltd.; marca registrada, Oki Electric Industry Company, Ltd.

MICROLINE is a registered trademark of Oki Electric Industry Company, Ltd.; marque depose de

Oki Electric Industry Company, Ltd.

OkiSmart Paper Handling is a trademark of Oki Electric Industry Company, Inc.

PLUG n PRINT is a registered trademark of Oki America, Inc.; marque deposee de Oki America,

Inc.

Bitstream is a registered trademark of Bitstream Incorporated.

Epson is a registered trademark of Seiko Epson Corporation.

IBM is a registered trademark of International Business Machine Corporation.

MS-DOS is a registered trademark of Microsoft Corporation.

PC is a registered trademark of International Business Machine Corporation.

Proprinter is a registered trademark of International Business Machine Corporation.

Windows is a trademark of Microsoft Corporation

Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

Page: 3

Service Guide ML520/521

Chapter 1 Product Specifications

1.1.01 General Information

The Microline 520 and Microline 521 are letter quality, nine-pin, dot-matrix printers which utilize

OKISMART

paper handling. Patented Okidata technology does away with the manual head gap

adjustment. The printer actually reads and learns the print medium being used, then automatically adjusts

the head gap to the optimum distance. This autogapping process leads to longer printhead life.

Options include the Bottom Feed Push Tractor, Cut-Sheet Feeder, Pull Tractor and Serial Interface Board.

The Microline 520 is an 80 column printer.

The Microline 521 is a 132 column printer.

Okidata's one year limited warranty covers the parts, labor and printhead on both printers.

The following items are available for the printer.

OKISMART Typer

- software which provides the flexibility for the Microline 590/521 to function like a

typewriter on checks, labels and envelopes.

OKISMART Panel

- a utility program that lets you control selected printer functions from your personal

computer.

Scalable Fonts - 14 scalable fonts, available on diskette.

NOTE:

The OkiSmart software includes three programs.

1. OkiSmart Control

2. OkiSmart Panel Emulator

3. OkiSmart Setup

Refer to the Printer Handbook for more information.

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Page: 4

Service Guide ML520/521

Chapter 1 Product Specifications

1.2 PHYSICAL SPECIFICATIONS

1.2.01 Dimensions

NOTE:

Dimensions INCLUDE the platen knob, acoustic cover, and paper separator.

Microline 520

Width: 16.9 inches (43 centimeters)

Depth: 14.9 inches (37.8 centimeters)

Height: 6.5 inches (16.5 centimeters)

Microline 521

Width: 23 inches (58.4 centimeters)

Depth: 14.9 inches (37.8 centimeters)

Height: 6.5 inches (16.5 centimeters)

1.2.02 Printer Weight

Microline 520

17.6 pounds (8.0 kilograms)

Microline 521

23.1 pounds (10.5 kilograms)

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