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Oki ML590 User Manual

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Page: 1
Service Guide ML590/ML591
Chapter 0 About This Manual
ML590 // ML591
Dot Matrix Printers
Adobe Acrobat printable reference
copy of the OKIDATA Service Training Manual.
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.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Table of Contents Page
Service Guide ML590/ML591
0 About This Manual
Front Cover 1 Copyright 2 Part Number & Manual Revision 3
1 Product Specifications
1.1 General Information 4
1.2 Physical Specifications 5
1.3 Power Requirements 6
1.4 Environmental Conditions 7
1.5 Agency Approvals 8
1.6 Operation Spec's - Print Speed and Character Matrix 9
....1.6.02 Characters Per Line 10
....1.6.03 Character Pitches 11
....1.6.04 Character Sets 12
....1.6.05 Printer Emulations 13
1.6.06 Fonts 14
1.6.07 Front Panel Switches 15
1.6.08 Graphics Resolution 16
1.6.09 Interface 17
....1.6.10 Line Feed Increments 18
....1.6.11 Line Feed Time 19
1.6.12 Menu Mode 20
....1.6.13 Paper Feed Methods 21
....1.6.14 Paper Feed Paths 22
....1.6.15 Paper Loading 23
....1.6.16 Paper Out Detection 24
....1.6.17 Paper Tear Capabilities 25
....1.6.18 Print Method 26
........Printhead Gap Information 27
....1.6.19 Print Modes 28
....1.6.20 Print Speed 29
1.7 Paper Specifications 30
1.8 Memory Specifications 31
1.9 Consumables 32
1.10 Options 33
....1.10.01 Cut Sheet Feeders 34
....1.10.02 Pull Tractor Kit 35
....1.10.03 Color Ribbon Kit 36
....1.10.04 Bottom Push Tractor Kit 37
....1.10.05 Serial Interface 38
....1.10.06 Roll Paper Stand 39
....1.10.07 Bitstream Facelift 2.0 40
Table of Contents Page
....1.10.08 OKISmart Typer Utility 41
....1.10.09 OKISmart Panel Utility 42
1.11 Reliability 43
2 Principles of Operation
2.1 Electrical Operation 44
....2.1.02 Main Control Board 45
........Block Diagram 46
........Program ROM 47
........RAM 48
........Character Generator ROM (CG ROM) 49
........Electrically Erasable Programmable ROM (EEPROM) 50
........LSI 51
....2.1.03 Initialization 52
....2.1.04 Parallel Interface Control 53
....2.1.05 Print Control 54
........LSI/Printhead Interface 55
........Gap Adjust Control 56
........Print Compensation Control 57
....2.1.06 Space and Line Feed (SP/LF) Motor Control 58
........Line Feed Motor Control 59
........Space Motor Control 60
........Encoder Disk 61
....2.1.07 Operation Panel 62
....2.1.08 Alarm Circuit 63
........Head Drive Time 64
........Print Speed 65
........Head Overheat Alarm Processing 66
....2.1.09 Power Supply Circuit 67
2.2 Mechanical Operation 68
....2.2.01 Printhead Mechanism 69
........Interconnect Diagram: Control Board to Printhead 70
........Line Feed Motor Resistance 71
........Space Motor Resistance 72
........Printhead Operation 73
....2.2.02 Spacing Mechanism 74
....2.2.03 Head Gap Mechanism 75
....2.2.04 Ribbon Drive Mechanism 76
........Color Ribbon Shift Mechanism 77
....2.2.05 Line Feed Mechanism 78
........Cut Sheet/Continuous Sheet Switching Mechanism 79
........Cut Sheet Paper Feed Operation 80
........Continuous Paper Feed (Rear Tractor Mechanism) 81
........Continuous Paper Feed (Pull Tractor Mechanism) 82
........Continuous Paper Feed (Bottom Tractor Feed
Mechanism)
83
Table of Contents Page
........Continuous Paper Feed (Push/Pull Tractor Mechanism) 84
....2.2.06 Paper Detection Mechanism 85
....2.2.07 Support Protector Mechanism 86
....2.2.08 Automatic Paper Load 87
....2.2.09 Paper Park 88
3 Maintenance & Disassembly
....3.1.01 General Information 89
....3.1.02 Maintenance Tools 90
....3.1.03 Maintenance Precautions 91
3.2 Disassembly/Assembly Procedures 92
....3.2.01 Preliminary Items 93
....3.2.02 Printhead Assembly 94
....3.2.03 Ribbon Protector 95
....3.2.04 Gear Case Assembly 96
....3.2.05 Pull-up Roller Assembly 97
....3.2.06 Upper Cover, Access Cover, and Sheet Guide
Assemblies
....3.2.07 Control Board (AKGI) 99
....3.2.08 Power Supply Assembly 100
....3.2.09 Operator Panel PCB (LEOP) 101
....3.2.10 PC Connector 102
....3.2.11 Space Motor and Roller Guide Assemblies 103
....3.2.12 Carriage Cable 104
....3.2.13 Space Rack 105
....3.2.14 Roller/Holder Backup Assembly 106
....3.2.15 Guide Rail and Adjust Cam 107
....3.2.16 Left Ground Plate 108
....3.2.17 Right Ground Plate 109
....3.2.18 Rear and Cut Sheet Paper Feed Sensor Levers 110
....3.2.19 Platen Assembly 111
....3.2.20 Paper Chute Assembly 112
....3.2.21 Line Feed Motor Assembly 113
....3.2.22 Reset Spring 114
....3.2.23 Idle Gear and Change Lever 115
....3.2.24 Pressure Spring 116
....3.2.25 Carriage Shaft 117
....3.2.26 Leaf Spring 118
....3.2.27 Bottom Paper Sensor Levers 119
....3.2.28 Front Pressure Roller Assembly 120
....3.2.29 Tractor Assembly 121
....3.2.30 Main Frame 122
3.3 Printer Adjustments 123
....3.3.02 Printhead Gap Adjustment 124
....3.3.03 Key Combinations 125
98
Table of Contents Page
....3.3.04 Menu Operation 126
........Printing the Menu 127
........Reset Menu to Factory Defaults 128
........Limited Operation 129
........Procedure 130
........Menu Settings 131
....3.3.05 Top of Form 132
....3.3.06 Paper Park 133
....3.3.07 Tear Feature 134
....3.3.08 Forms Tear Off 135
3.4 Cleaning 136
....3.4.02 Cleaning Schedule 137
....3.4.03 Cleaning Tools 138
....3.4.04 Areas to be Cleaned 139
3.5 Lubrication 140
3.6 Shipping Instructions 141
4 Failure & Repair Analysis
4.1 Introduction 142
....4.1.02 Printer Serial Number Identification 143
4.2 Reporting Problems 144
4.3 Troubleshooting Updates 145
4.4 Troubleshooting Tips - Preliminary Checks 146
....4.4.02 Problem Categories 147
....4.4.03 Start Here Flowchart 148
....4.4.04 Tips for Preventing Image Problems 149
....4.4.05 Common Problems 150
4.5 Abnormal Output & Output Samples 151
........Left Margin Drifting Problem 152
4.6 Fault Alarms 153
....4.6.02 Alarm/LED Display Troubleshooting Table Index 154
....4.6.03 Alarm/LED Display Troubleshooting Tables 155
4.7 Repair Analysis Procedures (RAPs) 156
....4.7.01 Using the RAPs 157
....4.7.02 RAP Index 158
........RAP 01 No Power Supplied to Printer 159
........RAP 02 No Spacing Operation 160
........RAP 03 Printhead Homing Error 161
........RAP 04 Paper Jam During Paper Loading 162
........RAP 05 Printhead Pins Not Firing 163
........RAP 06 Poor Print Quality 164
........RAP 07 Ribbon Feed Problem 165
........RAP 08 Line Feed Problem 166
........RAP 09 Operation Panel Malfunction 167
........RAP 10 Parallel Interface Problem 168
Table of Contents Page
........RAP 11 Serial Interface Problem 169
4.8 Printer Tests 170
....4.8.02 Rolling ASCII Test 171
....4.8.03 Font Test 172
....4.8.04 Serial Interface Loopback Test 173
........Serial Cable Information 174
........Commonly Used Serial Cable Configurations 175
....4.8.05 Hexadecimal Dump Mode 176
4.9 Resistance Checks 177
....4.9.02 Printhead Interconnect Diagram: Control Board to
Printhead
....4.9.03 Line Feed Motor Resistance 179
....4.9.04 Space Motor Resistance 180
A Reference Charts
General Information 181 A.2 Index To Charts 182
....Interconnect Diagram 183
....A.2.01 Main Controller Board (AKGI) 184
....A.2.02 Operator Panel Board (LEOP) 185
....A.2.03 Power Supply Assembly 186
....A.2.04 Space Motor Board 187
....A.2.05 RS232-C Serial Interface Board (LXHI) Option 188
B Illustrated Parts Listing
General Information 189
....B.1.02 Definition of Terms 190
....B.1.03 Parts Ordering Information 191
B.2 Charts 192
....Board Overview 193
....B.2.01 Printer 194
....B.2.02 Upper Cover Assembly 195
....B.2.03 Printer General Assembly 196
....B.2.04 Printer Unit (1 of 3) 197
....B.2.05 Printer Unit (2 of 3) 198
....B.2.06 Printer Unit (3 of 3) 199
....B.2.07 Carriage Assembly 200
....B.2.08 Options 201
....B.2.09 Option Parts 202
....B.2.10 Consumables 203
....B.2.11 Packing Materials 204
....B.2.12 Documentation 205
....B.2.13 Service Training Kit Revision List 206
178
Service Guide ML590/ML591
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.
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
Page: 2
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.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 3
Service Guide ML590/ML591
Chapter 0 About This Manual
© 1994 by Okidata All rights reserved.
First Edition October, 1992 P/N 59256301
Second Revision March, 1993 Third Revision August, 1993
Second Edition April, 1994 P/N 59256302
Fourth Revision April, 1994
Third Edition November, 1994 P/N 59256303
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 4
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.1.01 General Information
The Microline 590 and Microline 591 are letter quality dot-matrix printers which utilize OKISMART paper handling. Patented Okidata technology does away with the manual head gap adjustment. The Microline 590/591 actually "reads and learns" the media you feed in, then automatically adjusts the head gap to the optimum distance. This auto-gapping process leads to longer printhead life.
An optional, user-installable Color Kit (coupled with a customer-provided color software package) allows the printers to add impact to graphics, charts, transparencies and text presentations.
Additional options include the Bottom Feed Push Tractor, Cut-Sheet Feeder, Pull Tractor and Serial Interface Board.
The Microline 590 is an 80 column printer. The Microline 591 is a 132 column printer. Okidata's extended two year limited warranty covers the parts, labor and printhead on both printers. The following items are included with the printer: OKISMART Typer - software which provides the flexibility for the Microline 590/591 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.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.2 PHYSICAL SPECIFICATIONS
1.2.01 Dimensions
Note:
Dimensions INCLUDE the platen knob, acoustic cover, and paper separator.
Microline 590
Width: 18.35 inches (466 millimeters) Depth: 17.24 inches (438 millimeters) Height: 6.52 inches (165 millimeters)
Microline 591
Width: 24.41 inches (620 millimeters) Depth: 17.24 inches (438 millimeters) Height: 6.52 inches (165 millimeters)
1.2.02 Printer Weight
Page: 5
Microline 590
16.5 pounds (6.5 kilograms)
Microline 591
19.8 pounds (8.9 kilograms)
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 6
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.3 POWER REQUIREMENTS
1.3.01 Input Power
120 VAC: +5.5 / -15% 230/240 VAC: +10 / -14%
1.3.02 Power Consumption
Operating: 110 VA Idle: 40 VA
1.3.03 Power Frequency
120 VAC: 60 Hz +/- 2% 230/240 VAC: 50/60 Hz +/- 2%
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 7
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.4 ENVIRONMENTAL CONDITIONS
1.4.01 Acoustic Rating
Letter Quality Mode: 53 dBA Quiet Mode: 50 dBA
1.4.01 Altitude
10,000 feet (3,050 meters)
1.4.03 Ambient Temperature and Relative Humidity (RH)
While operating: 41° to 104° F (5° to 40° C) Operating humidity: 20% to 80% RH While in storage: 14° to 122° F (-10° to 50° C) Storage humidity: 5% to 95% RH
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 8
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.5 AGENCY APPROVALS
1.5.01 Listings
UL No: UL Standard No. 1950 CSA No: CSA Standard 22.2-950 FCC: FCC Certified per Part 15, Subject J, Class B IEC: IEC 950 VDE: VDE 0805 VDE 0875 Class B BS: BS 7002
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
1.6.01 Character Matrix Sizes
Table of Print Speed and Character Matrix
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Service Guide ML590/ML591
Chapter 1 Product Specifications
Mode
Speed 120 (12 cpi) 360 (12 cpi) 450 (15 cpi) Matrix (H x V) 29 x 18 9 x 17 7 x 17
Print Speed at Different CPI for the ML 590
Mode
Utility 10 300 120 180 30
LQ 10 100 360 180 10
LQ Utility High Speed Draft
CPI CPS Horiz. DPI Vert DPI IPS
12 360 120 180 30 15 450 120 180 30
17.1 257 240 180 15 20 300 240 180 15
12 120 360 180 10 15 150 360 180 10
17.1 171 360 180 10 20 200 360 180 10
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
1.6.02 Characters Per Line
Microline 590
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Service Guide ML590/ML591
Chapter 1 Product Specifications
Characters Per Line
80 10 164 65
96 12 161 65
120 15 148 65
136 17.1 96 65
160 20 95 65
Microline 591
Characters Per Line
136 10 105 40
Characters Per Inch
Characters Per Inch
Utility Letter Quality
Utility Letter Quality
163 12 96 40
204 15 88 40
233 17.1 59 40
272 20 59 40
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.03 Character Pitches
5, 6, 8.5, 10, 12, 15, 17.1, 20
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
1.6.04 Character Sets
Standard ASCII EPSON Character Set I & II IBM Character Set I, II & All Characters Foreign Character Substitution International Character Sets Code Page 850, 860, 863 and 865 Bar Code:
Code 39
UPC A UPC E EAN 8 EAN 13 Interleaved 2 of 5 Code 128 POSTNET
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Service Guide ML590/ML591
Chapter 1 Product Specifications
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.05 Printer Emulations
Note:
The emulations are co-resident
Epson LQ IBM XL 24E (AGM) IBM Proprinter
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
1.6.06 Fonts
Letter Quality
Courier Letter Gothic Prestige Orator Roman Swiss
Draft
Utility High Speed Draft (15 cpi)
Bar Code
Code 39 UPC A UPC E EAN 8 EAN 13 Interleaved 2 of 5 Code 128 POSTNET
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Service Guide ML590/ML591
Chapter 1 Product Specifications
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 15
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.07 Front Panel Switches
Select Micro Feed Up / Down Menu Mode Paper Park Line Feed Pitch Selection Form Feed Print Quality Selection Top of Form Tear Quiet
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 16
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.08 Graphics Resolution
Graphics Resolution: 360 x 360 DPI maximum
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 17
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.09 Interface
Standard
Parallel
Optional
RS232C Serial
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 18
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.10 Line Feed Increments
Fixed
(6 lines per inch lpi) [0.167 inch (4.23 millimeters)] (8 lines per inch lpi) [0.125 inch (3.175 millimeters)]
Variable
n/60 inch n/72 inch n/180 inch n/216 inch n/360 inch
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Page: 19
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.11 Line Feed Time
65 milliseconds 6 lines per inch (lpi) 6 milliseconds 8 lines per inch (lpi) 1 second 5.0 inches (Continuous paper feed rate)
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 20
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.12 Menu Mode
Print: Prints the entire menu. Group: Selects Group Function Item: Selects Item Set: Selects Item Value Exit: Exits Menu Mode, Enters Select
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 21
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.13 Paper Feed Methods
Standard
Friction Feed (Top) Rear Push Tractor (Rear)
Optional
Pull Tractor (Bottom) Bottom Push Tractor (Bottom) Single-Bin Cut Sheet Feeder (Top)
CSF 5000 - Narrow CSF 5001 - Wide
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Page: 22
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.14 Paper Feed Paths
Top Feed (Standard) Rear Feed (Standard) Bottom Feed (by using an Optional feed mechanism) Special Features
Paper Park Automatic Paper Loading Forms Tear Off
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 23
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.15 Paper Loading
Auto Loading (Top Feed)
LOAD
Press
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
switch for Bottom/Rear Feed
Page: 24
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.16 Paper Out Detection
Distance from end of paper
Rear Feed: 0.5 inches (12.7 mm) Bottom Feed: 0.5 inches (12.7 mm) Top Feed: 0.5 inches (12.7 mm)
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Page: 25
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.17 Paper Tear Capabilities
Forms Tear-0ff (sharp edge on access cover) Metal Tear Bar (with optional bottom tractor unit)
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML590/ML591
1.6.18 Print Method
Printhead Type General Information
Impact: Dot Matrix 24 pin printhead .0079 inch (.20 millimeter) diameter pins
Overheat Protection
When printhead temperature exceeds 110 degrees Celsius, the printer stops
bi-directional printing. Uni-directional printing begins.
If the temperature exceeds 115 degrees Celsius, printing stops. Printing will resume when the printhead temperature drops below 115 degrees Celsius.
Note:
Refer to Section Two for more information on printhead operation.
Page: 26
Chapter 1 Product Specifications
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Printhead Gap Information
Three items factor into printhead gap information.
1. Printhead Gap Adjustment This is a It is covered in Section 3.3 of this Service Handbook. The Adjustment measures 0.014, +/- 0.001 inches (0.35, +/- 0.03 mm).
2. Printhead Gap Adjust
This is a It fine tunes the automatic setting of the printhead gap. The settings are 0, 1, and -1. 0 is the factory default. Use 1 to darken print (if output is consistently light). Use - 1 to lighten print (if output is consistently dark).
3. Gap Control
This is a The Groups are Gap Control determines how the printhead gap is set. The settings are listed below.
An explanation of each setting follows.
SERVICE ADJUSTMENT
MENU ITEM
MENU ITEM
REAR FEED, BOTTOM FEED,
Auto Gap, Semi Auto Gap, 1, 2, 3, 4, 5, 6, 7, 8, 9 Auto Gap
This is the factory default. Automatically determines paper thickness of the first page. During single-sheet feed, each page's thickness is checked while a job is printing. Semi Auto Gap Similar to Auto Gap. Automatically determines paper thickness of the first page. During single-sheet feed, each page's thickness IS NOT checked "while" a job is printing 1, 2, 3, 4, 5, 6, 7, 8, 9 Used when the same paper is used ALL of the time. Bypasses the automatic head gap adjustment. 1 is the narrowest gap setting. 9 is the widest gap setting.
SET-UP
in the
in each [Paper Feed] Group.
Service Guide ML590/ML591
Chapter 1 Product Specifications
made by a technician.
Group.
TOP FEED
and
.
Page: 27
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Page: 28
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.19 Print Modes
Letter Quality Utility High Speed Draft
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
1.6.20 Print Speed
Table of Print Speed and Character Matrix
Page: 29
Service Guide ML590/ML591
Chapter 1 Product Specifications
Mode
Speed 120 (12 cpi) 360 (12 cpi) 450 (15 cpi)
Matrix (H x V) 29 x 18 9 x 17 7 x 17
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
LQ Utility High Speed Draft
1.7 PAPER SPECIFICATIONS
Page: 30
Service Guide ML590/ML591
Chapter 1 Product Specifications
CAUTION:
1.7.01 Types
Card Stock
Weight: 120 lbs. (450 g/m2) Maximum Width: Microline 590 5 to 8 inches (12.7 to 20.3 centimeters)
Length: 3 to 17 inches (7.62 to 43.18 centimeters) Thickness: .017 inches (0.44 millimeters) Paper Feed Path: Bottom Printhead Gap Information:
Continuous Form
Weight: Single Part 12 - 24 lb. (45 to 90 g/m2) Multi-Part Carbonless 9 - 11 lb. (35 to 40 g/m2) Multi-Part, Interleaf Paper 10 - 12 lb. (38 to 45 g/m2) Carbon 9 lb. (35 g/m2) Width: Microline 590 3.5 to 10.5 inches (8.8 to 26.6 centimeters)
Length: 3 to 17 inches (7.62 to 43.18 centimeters) Thickness: 0.014 inches (0.36 millimeters) Rear Feed
Use Bottom Feed and/or optional Pull Tractor for card stock and labels.
Microline 591 5 to 14 inches (12.7 to 35.6 centimeters)
Refer to the Printhead Gap Information, Section 1.6
Microline 591 3.5 to 16.5 inches (8.8 to 41.9 centimeters)
0.017 inches (0.44 millimeters) Bottom Feed
.
Paper Feed Path: Rear or Bottom Printhead Gap Information:
Cut Sheet
Weight: 12 to 24 lbs. (45 to 90 g/m2) Width: 7.2 to 14.3 inches (18.3 to 36.3 centimeters) Width: Microline 590 7.2 to 8.5 inches (18.2 to 21.5 centimeters)
Length: 3 to 17 inches (7.62 to 43.18 centimeters) Thickness: 0.014 inches (0.325 millimeters) Maximum Paper Feed Path: Top Printhead Gap Information:
Envelopes
Weight: 24 lbs. (90 g/m2) Maximum Size:
Refer to the Printhead Gap Information, Section 1.6
Microline 591 7.2 to 14.3 inches (18.2 to 36.3 centimeters)
Refer to the Printhead Gap Information, Section 1.6.
.
Single Feed
Continuous Thickness: .014 inches (.325 millimeters) Maximum
Paper Feed Path: Bottom Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6. .
Labels
Weight: N/A Width: Microline 590 3.5 to 10.5 inches (8.8 to 26.6 centimeters)
Length: 3 to 17 inches (7.62 to 43.18 centimeters) Thickness: .011 inches (0.28 mm) Maximum (including backing) Paper Feed Path: Bottom Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6. .
CAUTION: Use Bottom Feed and/or optional Pull Tractor for card stock and labels.
Transparency
Note: Roller marks may mar the transparency under high temperature/
Weight: 12 to 24 lbs. (45 to 90 g/m2) Width: Microline 590 7.2 to 8.5 inches (18.2 to 21.5 centimeters)
Length: 3 to 17 inches (7.62 to 43.18 centimeters) Thickness: 0.14 inches (0.36 millimeters) Paper Feed Path: Top Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6. .
Minimum: 6.5 x 3.6 inches (16.5 x 9.1 centimeters) Maximum: 9.5 x 4.1 inches (24.1 x 10.4 centimeters)
Non-overlap type
Microline 591 3.5 to 16.5 inches (8.8 to 41.9 centimeters)
high humidity conditions.
Microline 591 7.2 to 14.3 inches (18.2 to 36.3 centimeters)
1.7.02 Length
Note: The recommended length is specific to paper type.
Rear Feed
Minimum 3 inches (7.62 centimeters) Maximum 17 inches (43.18 centimeters)
Bottom Feed
Minimum 3 inches (7.62 centimeters) Maximum 17 inches (43.18 centimeters)
Top Feed
Minimum 3 inches (7.62 centimeters) Maximum 17 inches (43.18 centimeters)
1.7.03 Number of Copies
Original + 4 Interleaf Original + 4 Carbonless Original Cut Sheet
1.7.04 Thickness
0.014 inches / 0.36 mm Maximum Thickness, Rear Feed
0.017 inches / 0.44 mm Maximum Thickness, Bottom Feed
1.7.05 Weight
Note: The recommended weight is specific to paper type.
Minimum: 9 lb. (35 g/m2) Maximum: 24 lb. (90 g/m2)
1.7.06 Width
Note: The recommended width is specific to paper type.
Paper
Microline 590
Minimum: 3.5 inches (8.8 centimeters) Maximum: 10.5 inches (26.6 centimeters)
Microline 591
Minimum: 3.5 inches (8.8 centimeters) Maximum: 16.5 inches (41.9 centimeters)
Printing Area
Microline 590 8 inches Maximum Microline 591 13.6 inches Maximum
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1.8 MEMORY SPECIFICATIONS
1.8.01 EEPROM
1 Kbit serial EEPROM (used to store Menu data)
1.8.02 ROM
"Older" Configuration 1 Mbit, Character Generator ROM (located on main control board, 05C) 1 Mbit, Printer Control EPROM (located on main control board, 05D) "New" Configuration 4 Mbit (located on main control board, 05D)
1.8.03 RAM
Receive Buffer Size is selected through the Menu. Settings are: 64 K, 32 K, 1 line
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Service Guide ML590/ML591
Chapter 1 Product Specifications
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1.9 CONSUMABLES
1.9.01 Ribbon
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Service Guide ML590/ML591
Chapter 1 Product Specifications
CAUTION:
warranties.
Material Types
Life (On average, at 10 characters per inch, Utility Mode)
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Using a non-Okidata ribbon may damage the printhead and void any
Cartridge Fabric Black Ribbon
Color Ribbon
Magenta Yellow Cyan Black
Black Ribbon 4 million characters Color Ribbon
Magenta 1.5 million characters Yellow 0.8 million characters Cyan 1.5 million characters Black 1.5 million characters
1.10 OPTIONS
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Service Guide ML590/ML591
Chapter 1 Product Specifications
Cut Sheet Feeders ...... (
Pull Tractor Kit ............ (
Color Ribbon Kit .......... (
Bottom Push Tractor .... (
Serial Interface ............ (
Roll Paper Stand ......... (
Bitstream Facelift 2.0 ...( OKIsmart Typer Utility .. ( OKIsmart Panel Utility .. (
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)
)
)
)
) ) )
) )
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Service Guide ML590/ML591
Chapter 1 Product Specifications
1.10.01 Cut Sheet Feeders
The CSF-5000 is a narrow feeder for the Microline 590.
Single Bin with envelope capability Paper Width: 7.2" to 8.5" (18.3 cm to 36.3 cm) Paper Length: 10.1" to 14" (25.6 cm to 35.6 cm) Capacity: 170 sheets (16 lb.), 100 sheets (20 lb.)
The CSF-5001 is a wide feeder for the Microline 591.
Single Bin with envelope capability Paper Width: 7.2" to 14.3" (18.3 cm to 36.3 cm) Paper Length: 10.1" to 14" (25.6 cm to 35.6 cm) Capacity: 170 sheets (16 lb.), 100 sheets (20 lb.)
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Page: 35
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.10.02 Pull Tractor Kit
Note:
The Pull Tractor Kit (P/N 70023001) is a narrow feeder for the Microline 590.
The Pull Tractor Kit (P/N 70023201) is a wide feeder for the Microline 591.
Bottom Feed Rear Feed (For Push/Pull Operation) Paper Types: Continuous Feed and Labels
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Page: 36
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.10.03 Color Ribbon Kit
Includes:
Color mechanism Color Ribbon
End user installable
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Page: 37
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.10.04 Bottom Push Tractor Kit
Note:
The Bottom Push Tractor Kit (P/N 70022901) is a narrow feeder for the Microline
590. The Bottom Push Tractor Kit (P/N 70023101) is a wide feeder for the Microline 591.
Bottom Feed Paper Type: Continuous Feed Includes: Stand and Metal Tear B
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Page: 38
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.10.05 Serial Interface
Super-Speed 19.2K RS-232C Ready/Busy/X-On/X-Off Protocols Can be configured through the Menu or OKISmart Utility Program
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Page: 39
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.10.06 Roll Paper Stand
Adapts printer for use with roll-type paper (Model 590 only) Includes: Stand, Support, Cord and DIN plug for connection to printer
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Page: 40
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.10.07 Bitstream Facelift 2.0
For Windows 3.0 and 3.1 Includes: 14 scalable fonts
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Page: 41
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.10.08 OKISmart Typer Utility
Packaged with printer Includes: Typewriter Mode, Form Creation Utility and Barcode Utility
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Page: 42
Service Guide ML590/ML591
Chapter 1 Product Specifications
1.10.09 OKISmart Panel Utility
Packaged with printer Includes: Front Panel Control Utility and Drivers for Windows 3.0 & 3.1
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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1.11 RELIABILITY
1.11.01 Mean Time Before Failure (MTBF)
Approximately 6,000 hours: 25% duty cycle / 35% page density
1.11.02 Mean Time To Repair (MTTR)
Approximately 15 minutes to major sub-assembly level
1.11.03 Printer Life
Approximately 16,000 hours of power-on time: 25% duty cycle / 35% page density
1.11.04 Printhead Life
Average 200 million characters in 10 cpi utility mode @ normal 25% duty, 35% page density
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Service Guide ML590/ML591
Chapter 1 Product Specifications
1.11.05 Ribbon Life
Black: Approximately 4 million characters Color:
1.11.06 Warranty (Limited)
Two years, parts and labor
1.11.07 Service
Authorized Okidata Service Centers
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Black: Approximately 1.5 million characters Cyan: Approximately 1.5 million characters Magenta: Approximately 1.5 million characters Yellow: Approximately 0.8 million characters
Page: 44
Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.1 ELECTRICAL OPERATION
2.1.01 General Information
The printers is made of the following electrical components.
Main Control Board Power Supply Assembly Operator Panel Space Motor / Line Feed Motor Printhead
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.1.02 Main Control Board
The main control board is made up of the microprocessor, peripheral circuits, drive circuits, sensors and interface connectors.
The power to the main control board is supplied by the power supply assembly through a wire harness. The power to other electrical parts, such as the line feed motor, space motor and printhead, is supplied by the power supply assembly through the connectors on the main control board.
Microprocessor (MPU)
Location 04D: 67X640 16 bit MPU, using CMOS technology. The MPU contains a 20 bit address bus, a 16 bit data bus. The MPU can access 1 Mbyte of program memory space and 1 Mbyte of data memory space. The microprocessor controls the entire printer by executing the control program through the LSI and the driver circuit.
Page: 45
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Program ROM
Location 05D: 27C1024 This 64k x 16 bit (Mbit) EPROM contains the control program for the printer. The MPU executes
the instructions contained in this program. The Program ROM is assigned to the program memory area of the MPU and instructions are
fetched by the PSEN signal of the MPU.
Page: 47
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
RAM
Location 05E: 511664Z. The RAM is CMOS dynamic RAM with 65,536 words x 16-bit configuration, and is used as a
receive buffer, print buffer and work buffer.
Page: 48
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Character Generator ROM (CG ROM)
Location 05C: 27C4096.
This 256k x 16 bits (4 Mbit) masked EPROM contains the character data for the various fonts. The CG ROM is assigned to the program memory area of the MPU. The data is accessed by the
PSEN signal of the MPU.
Page: 49
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Electrically Erasable Programmable ROM (EEPROM)
Location 03C: 93CS46. The EEPROM is a CMOS serial I/O type memory which is capable of electrically erasing and
writing 1,024 bits The EEPROM contains the menu data and the head drive time correction data.
Page: 50
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
LSI
Location 02D: MSM(79V035). Detects the output of the two-phase sensor on the DC space motor to control the motor drive
phase. Transmits and receives serial data to and from the printhead based on the dot timing (which is
derived from the space motor speed). Controls the external interface. The LSI is connected to the MPU.
Page: 51
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.1.03 Initialization
This printer is initialized when the printer is powered on or when the I-PRIME-N signal is input from the host via the parallel interface.
Printer Initialization occurs as listed below. The RST-N signal is output from the Reset circuit to reset the MPU and LSIs. The program is executed and the LSIs are reset by the MPU via IORST-N.
Page: 52
Note:
The program sets the LSI (02D) mode, checks the memory (ROM/RAM), then executes carriage homing and determines the phase of the line feed motor.
Finally, the program establishes the interface signals (P-I/F: ACK-P signal sending, and S-I/F: BUSY-N signal off) and lights the SELECT lamp to indicate that the printer is in the ON-LINE state.
A Reset operation initiated by I-PRIME does not reset the MPU.
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.1.04 Parallel Interface Control
The parallel data input from the host to the interface LSI is latched to the internal register by the falling edge of the STROBE-N signal.
The LSI sets the BUSY-N signal to inform the host that the data is being processed. The LSI also outputs the RXD-N signal to inform the MPU of data reception. The data is read upon receiving the RD-N signal from the MPU.
When the data processing is complete, the BUSY-N signal is disabled and the ACK-N signal is sent to request the next data. When the buffer is full and reception is not desired, the BUSY signal is sent to request data transmission be stopped.
Page: 53
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.1.05 Print Control
The print data is transmitted as serial data from the LSI to the control circuit and the driver contained in the printhead.
After the data is printed, the sensor analog circuit controlling each pin returns the pin stroke data to the MPU. The MPU will make an automatic head gap adjustment. This feedback system sets the optimum drive time for each pin in order to maintain high print quality.
Page: 54
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
LSI/Printhead Interface
The connection between the LSI and the printhead is made with the bi-directional serial data bus. The LSI transmits the print data as serial data to the logic circuit of the printhead. The printhead returns serial data from the printhead sensor analog circuit to the LSI. This information is used to determine the optimum drive time for the next print request.
The logic circuit of the printhead signals the LSI if a parity error is detected in the print data.
Page: 55
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Gap Adjust Control
The Gap Adjust LSI receives stroke length information for all of the printhead pins from the sensor analog circuit. The Gap Adjust LSI then sets the optimum printhead gap for the printing medium.
Page: 56
Note: Refer to Section 2.2.03
All values in the chart are in millimeters
for a description of the mechanical process.
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Print Compensation Control
The printhead compensates for the shape of the platen as shown below.
Page: 57
Note:
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Refer to Section 2.1.08 - Head Drive Time
Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.1.06 Space and Line Feed (SP/LF) Motor Control
The LSI (Location 02D: MSM79V035) generates the space motor and the line feed motor control signals according to commands received from the MPU. These signals are sent to the SP/LF motor driver.
Page: 58
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Line Feed Motor Control
The SP/LF motor driver (Location 5A: MHM2025) drives the line feed motor in two-phase bipolar, based on the phase changeover data output from the LSI.
The serial data from the LSI (02D:MSM79V035) is processed by a register contained in the SP/LF motor driver to measure the overdrive time and to change the phase.
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Space Motor Control
The SP/LF motor driver (Location 5A: MHM2025) drives the three-phase brushless motor. Motor movement is based on the phase signal (SPU,SPV and SPW) and the speed instruction data from the LSI. The MPU can identify the current speed of the space motor by measuring the pulse width of the output (Phase A, Phase B) of the encoder disk sensor.
After comparing the target speed for each print mode with the actual speed, the motor is accelerated or decelerated to maintain the desired speed for each print mode.
Page: 60
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Encoder Disk
As the space motor operates, the encoder disk spins. When the encoder disk interrupts the photo sensors, the signals Phase A and Phase B are generated. The LSI (Location 02D: MSM79V035) divides these edge pulse signals (the frequency division is based on the selected print pitch) to generate the signal IPT. The IPT signal provides dot-on timing and carriage position detection timing.
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.1.07 Operation Panel
The Serial I/O Port (Ports 20 - 23) of the MPU reads the operation panel switch data from the operation panel control LSI (Location IC1: BUS148S). The Serial I/O Port also outputs LED data to the operation panel control LSI.
A two byte (15 bits +1 parity bit (even parity)) command (OPTXD) is transmitted from the MPU to the operation panel LSI in synchronization with the OPCLK signal. Once the LSI decodes the command, the command must pass a command code check and have no parity errors. Then, the specified I/O control will return the two byte command response to the MPU.
Page: 62
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.1.08 Alarm Circuit
Driver Circuit Alarm Processing The printhead driver output, the head gap magnet output and the color ribbon magnet drive signal
are monitored at R670 and C15, and the POWER OFF-P signal is output by the comparator (Location 01A: IC2901) when driven for more than the specified time. This signal becomes the ALM signal. The ALM signal is sent to the power supply board and causes the DC voltages to be turned off.
Page: 63
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Page: 64
Service Guide ML590/ML591
Chapter 2 Principles of Operation
Head Drive Time
The head drive time is modified to compensate for the amount of the voltage drop of the POWLEV signal. By monitoring the voltage drop every 500 microseconds, the MPU is able to control and maintain the impact necessary for each printhead pin.
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Print Speed
Page: 65
Service Guide ML590/ML591
Chapter 2 Principles of Operation
Actual Voltage (+40 vdc)
+34 vdc or greater 1 100%
+32 vdc to +34 vdc 1 Approximately 85%
+30 vdc to +32 vdc 1 Approximately 50%
+30 vdc or less 2 Less than 50%
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Passes Required
Relative Print Speed
Service Guide ML590/ML591
Chapter 2 Principles of Operation
Head Overheat Alarm Processing
Two thermistors are used to monitor the printhead temperature. One is contained in the printhead and the other in the printhead driver. The voltage of the TSD signal is monitored at the MPU A/D port to control the pass number and print method (unidirectional / bi-directional) at each of seven levels. If the printhead temperature exceeds 110 degrees Celsius, the printer will switch to unidirectional print. If the temperature exceeds 115 degrees Celsius, printing will stop. Once the printhead cools, printing will resume.
Page: 66
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.1.09 Power Supply Circuit
The switching type power supply circuit supplies the +5 vdc, +/-8 vdc, +12 vdc and +40 vdc.
Page: 67
Table of Output Voltages
Voltage / Signal
+5 vdc IC logic levels LED drive voltages
+8 vdc Serial interface line voltage comparator IC
-8 vdc Serial interface line voltage
+12 vdc Printhead analog circuit
+40 vdc Printhead space motor and line feed motor drive voltage
ALM Output from the main control board upon detection of an
Purpose
abnormality in the printhead head gap or color ribbon drive circuits. This signal will cause all DC voltages to be turned off.
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.2 MECHANICAL OPERATION
The following section explains the mechanical operation of the printer.
Page: 68
Spacing Mechanism .................................... (
Head Gap Mechanism .............................. (
Ribbon Drive Mechanism .......................... (
Line Feed Mechanism ................................ (
Paper Detect Mechanism ......................... (
Support Protector Mechanism ................. (
Automatic Paper Load ............................... (
Paper Park .................................................. (
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) ) ) ) ) ) ) )
Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.2.01 Printhead Mechanism
The printhead is a spring charged 24-pin printhead. It is attached to the carriage, which moves parallel to the platen. Electrically, the printhead is controlled by the main control board via the carriage cable and the space motor.
Page: 69
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Interconnect Diagram: Control Board to Printhead
Note:
The printhead coil resistance values ARE NOT LISTED.
The individual print wire control lines CANNOT be accessed on this printhead.
Page: 70
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Line Feed Motor Resistance
The resistance of each coil should be approximately 13 ohms.
Page: 71
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Space Motor Resistance
The resistance of each coil should be approximately 5 ohms.
Page: 72
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Service Guide ML590/ML591
Chapter 2 Principles of Operation
Printhead Operation
When the printhead is idle, the armature is attracted to the permanent magnet. The print wires, which are attached to each armature, are then concealed inside the wire guide.
When a signal to print a character is received, current flows through a coil. The magnetic field generated by the coil opposes the magnetic field between the armature and the permanent magnet. The armature is then driven in the direction of the platen by the force of the armature spring. The print wire, which is attached to the armature, protrudes from the tip of the wire guide, strikes the paper through the ribbon and prints a dot on the paper.
As the armature gets closer to the electrode of the analog sensor, the capacitance between them increases and a small amount of current flows. This current is amplified and sent to the logic control LSI to indicate armature activity. In order to attain optimum drive time, this information is transferred to the MPU. The MPU continually modifies the head gap to maintain the optimum drive time condition.
The analog sensor element monitors all of the pins. The difference in pin stroke due to the curvature of the platen is compensated for at the logic control section of the printhead and is not transferred to the MPU.
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After the character has been printed, the permanent magnet attracts the armature and the print wires are retracted into the wire guide.
Two thermistors are used to monitor the printhead temperature. A thermistor in the printhead prevents over-heating of the coil during periods of continuous
bi-directional printing. If the printhead temperature exceeds 110 degrees Celsius, the printer will switch to unidirectional print. If the temperature exceeds 115 degrees Celsius, printing will stop. Once the printhead cools, printing will resume. When the temperature of the coil exceeds the pre-determined limits, the control circuit detects the thermistor signal (TSD).
A thermistor in the printhead driver monitors the temperature of the driver. If the temperature of the driver exceeds the pre-determined limits (110 degrees Celsius - unidirectional printing / 115 degrees Celsius - printing stops) the control circuit detects the thermistor signal (TSD). The voltage of the TSD signal is monitored at the MPU A/D port to control the pass number and print method (unidirectional / bi-directional) at each of seven levels.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.2.02 Spacing Mechanism
The spacing mechanism consists of a carriage shaft (mounted parallel to the platen), and a carriage frame which moves along the shaft. The carriage frame is driven by a DC servo motor mounted on the carriage frame. Items included in the spacing mechanism are listed below.
Space Motor Assembly DC Servo Motor Motor gear Sensor Encoder Disk Carriage Frame Carriage Shaft Space Rack Spacing Operation
The carriage frame, which contains the printhead and space motor, moves along the carriage shaft parallel to the platen. When the space motor rotates, the driving force is transmitted to the motor gear. As the motor gear rotates, the carriage moves along the platen. For every revolution of the DC servo motor, the carriage frame moves 0.8 inch (20.32 mm).
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As the DC servo motor rotates, a slotted disk (called the encoder disk), passes between a light source and two photosensors. The position of the carriage frame can be determined by counting the pulses generated by the photosensors.
In the same way, the rotation of the space motor can be recognized and controlled by measuring the phase relationship and the pulse width of the signals generated by the photosensors.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.2.03 Head Gap Mechanism
The head gap is automatically set for the thickness of the medium loaded in the printer. In the case of envelopes, where the medium thickness varies as the printhead moves along the platen, the head gap changes to compensate for the differences in thickness.
Head Gap Setting Operation
Once printing starts, the space motor rotates the ribbon gear, causing idle gear C to turn the change gear.
When the MPU requests a change in the head gap setting, the GAP-P signal causes the armature (which is holding the change gear) to be attracted to the pranger magnet. The gap reset spring can now push the change gear so it contacts the gap change gear.
The rotation of the gap change gear causes idle gear D to turn the adjust gear. The adjust gear turns the adjusting screw, resulting in a new head gap setting.
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Note:
As the adjusting screw turns counter-clockwise, the gap narrows.
As the adjusting screw turns clockwise, the gap widens.
There is a cam at each setting of the gap change gear. When the change gear is at the top of the cam, the change gear disengages from the gap change gear. At this time, the armature resets, changing the head gap by one setting.
The head gap is modified in .06 mm units for each range setting.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.2.04 Ribbon Drive Mechanism
Black Ribbon Drive Operation
The ribbon drive mechanism feeds the ribbon in synchronization with the spacing operation. The force required to drive the ribbon is obtained from the space motor.
The ribbon drive mechanism is composed of the following items.
Ribbon drive gear assembly Ribbon gear (located on the space motor assembly) Ribbon cartridge
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A continuous loop ribbon with uni-directional feed is used. Ink is supplied from an ink tank, which is built into the ribbon cartridge.
When the space motor turns, the ribbon gear on the spacing motor shaft rotates. The rotation is transmitted via a combination of gears, from the ribbon drive gear assembly to the drive gear in the ribbon cartridge.
Although the space motor moves in both the forward and reverse directions during bi-directional printing, the gears in the ribbon drive assembly maintain uni-directional ribbon feed by switching the rotation direction of the gears.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML590/ML591
Chapter 2 Principles of Operation
Color Ribbon Shift Mechanism
Items of the color ribbon unit option are listed below.
Color shift unit Color ribbon (4 colors)
Four colors can be selected by sliding the color ribbon holder up or down. Here is a description of how the ribbon holder is shifted.
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As the space motor moves, idle gear C on the ribbon drive unit rotates. Idle gear C rotates the color idle gear, located in the color shift unit.
When the color-P signal from the main control board activates the pranger magnet, the magnet attracts the armature. This causes the reset spring to force the change gear downward. The color idle gear rotates the change gear, which turns the color change gear. The color change gear turns the color cam shaft. The rotation of the color cam shaft moves the color ribbon holder up/down to select the desired ribbon color.
There is a cam at each setting of the color change gear. When the change gear is at the top of the cam, the change gear disengages from the color change gear. At this time, the armature resets, changing the color band selection by one setting.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.2.05 Line Feed Mechanism
The line feed operation is accomplished by activating the line feed motor which turns the platen. The rotation of the platen is used to feed paper from the selected paper path.
Components of the paper feed mechanism are listed below.
Line Feed Motor (pulse motor) with Gears Line Feed Idler Gear
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Platen Rear Tractor Feed Unit Pressure Roller Change Lever (Paper Path Selection Lever)
The change lever is used to select one of three different paper paths; top, rear or bottom.
Paper Clamp Mechanism
Moving the Change Lever between the Bottom, Top and Rear positions, changes the positions of the Front Release Gear Arm and the Release Cam.
The movement of the Front Release Gear Arm changes the position of the Front Release Gear Shaft. This causes the Front Pressure Roller to open or close.
The movement of the Release Cam causes the Rear Pressure Roller to open or close.
Position of Change Lever
Bottom OPEN N/A OPEN N/A
Top CLOSED 250 g CLOSED 700 g
Rear CLOSED 90 g OPEN N/A
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Status of Front Pressure Roller
Tension of Front Pressure Roller
Status of Rear Pressure Roller
Tension of Rear Pressure Roller
Service Guide ML590/ML591
Chapter 2 Principles of Operation
Cut Sheet/Continuous Sheet Switching Mechanism
Top Feed (for cut sheet paper)
When cut sheet paper is used, place the change lever in the Top Feed position. As the platen turns, the platen gear causes the idle gear to rotate. At this time, the rear and front pressure rollers press against the platen and feed the cut sheet.
The cut sheet detection lever enables the cut sheet detection switch, which is located on the main control board. This places the printer in the cut sheet mode.
When cut sheet paper is placed between the platen and the paper chute, the printer automatically feeds the sheet to the print start position.
Rear/Bottom Feed (for continuous feed paper)
When the continuous feed paper is used, either with the rear tractor, optional bottom tractor or optional pull tractor, place the change lever in the Rear/Bottom Feed position.
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When the change lever is placed in this position, the reset spring pushes the change gear. In this position, the idle gear is engaged with the bottom tractor unit drive gear and the tractor gear. As the platen turns, power is transferred from the platen gear - to the idle gear - to the change gear ­and to the push tractor shaft.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML590/ML591
Chapter 2 Principles of Operation
Cut Sheet Paper Feed Operation
As the line feed motor rotates, power is transferred through decelerating gears (line feed idler gear, platen gear) to the platen.
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When using cut sheet paper, the change lever must be in the pressure rollers can feed the paper. This also disengages the push tractor.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
TOP
position so the platen and
Service Guide ML590/ML591
Chapter 2 Principles of Operation
Continuous Paper Feed (Rear Tractor Mechanism)
As the platen rotates, power is transferred to the tractor gear from the platen gear, the idler gear and the change gear. The tractor gear drives the pin tractor belts which feed the continuous paper.
Page: 81
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML590/ML591
Chapter 2 Principles of Operation
Continuous Paper Feed (Pull Tractor Mechanism)
Bottom feed of continuous sheets is possible only when an optional pull tractor unit is installed. As the platen rotates, power is transferred to the drive gear from the LF idler gear, the platen gear,
idler gear B and idler gear A. The drive gear turns the pull tractor assembly which feed the continuous paper.
Page: 82
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
Service Guide ML590/ML591
Chapter 2 Principles of Operation
Continuous Paper Feed (Bottom Tractor Feed Mechanism)
As the platen rotates, power is transferred to the drive gear from the platen gear, the idle gear and the tractor change gear. The drive gear turns the pin tractor belts on the bottom tractor feed unit to feed the continuous paper.
Page: 83
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
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