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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. 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.
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 Copyright Part Number & Manual Revision 1 Product Specifications 1.1 General Information 1.2 Physical Specifications 1.3 Power Requirements 1.4 Environmental Conditions 1.5 Agency Approvals 1.6 Operation Spec's - Print Speed and Character Matrix ....1.6.02 Characters Per Line ....1.6.03 Character Pitches ....1.6.04 Character Sets ....1.6.05 Printer Emulations 1.6.06 Fonts 1.6.07 Front Panel Switches 1.6.08 Graphics Resolution 1.6.09 Interface ....1.6.10 Line Feed Increments ....1.6.11 Line Feed Time 1.6.12 Menu Mode ....1.6.13 Paper Feed Methods ....1.6.14 Paper Feed Paths ....1.6.15 Paper Loading ....1.6.16 Paper Out Detection ....1.6.17 Paper Tear Capabilities ....1.6.18 Print Method ........Printhead Gap Information ....1.6.19 Print Modes ....1.6.20 Print Speed 1.7 Paper Specifications 1.8 Memory Specifications 1.9 Consumables 1.10 Options ....1.10.01 Cut Sheet Feeders ....1.10.02 Pull Tractor Kit ....1.10.03 Color Ribbon Kit ....1.10.04 Bottom Push Tractor Kit ....1.10.05 Serial Interface ....1.10.06 Roll Paper Stand ....1.10.07 Bitstream Facelift 2.0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Table of Contents ....1.10.08 OKISmart Typer Utility ....1.10.09 OKISmart Panel Utility 1.11 Reliability 2 Principles of Operation 2.1 Electrical Operation ....2.1.02 Main Control Board ........Block Diagram ........Program ROM ........RAM ........Character Generator ROM (CG ROM) ........Electrically Erasable Programmable ROM (EEPROM) ........LSI ....2.1.03 Initialization ....2.1.04 Parallel Interface Control ....2.1.05 Print Control ........LSI/Printhead Interface ........Gap Adjust Control ........Print Compensation Control ....2.1.06 Space and Line Feed (SP/LF) Motor Control ........Line Feed Motor Control ........Space Motor Control ........Encoder Disk ....2.1.07 Operation Panel ....2.1.08 Alarm Circuit ........Head Drive Time ........Print Speed ........Head Overheat Alarm Processing ....2.1.09 Power Supply Circuit 2.2 Mechanical Operation ....2.2.01 Printhead Mechanism ........Interconnect Diagram: Control Board to Printhead ........Line Feed Motor Resistance ........Space Motor Resistance ........Printhead Operation ....2.2.02 Spacing Mechanism ....2.2.03 Head Gap Mechanism ....2.2.04 Ribbon Drive Mechanism ........Color Ribbon Shift Mechanism ....2.2.05 Line Feed Mechanism ........Cut Sheet/Continuous Sheet Switching Mechanism ........Cut Sheet Paper Feed Operation ........Continuous Paper Feed (Rear Tractor Mechanism) ........Continuous Paper Feed (Pull Tractor Mechanism) ........Continuous Paper Feed (Bottom Tractor Feed Mechanism)
Page 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83
Table of Contents ........Continuous Paper Feed (Push/Pull Tractor Mechanism) ....2.2.06 Paper Detection Mechanism ....2.2.07 Support Protector Mechanism ....2.2.08 Automatic Paper Load ....2.2.09 Paper Park 3 Maintenance & Disassembly ....3.1.01 General Information ....3.1.02 Maintenance Tools ....3.1.03 Maintenance Precautions 3.2 Disassembly/Assembly Procedures ....3.2.01 Preliminary Items ....3.2.02 Printhead Assembly ....3.2.03 Ribbon Protector ....3.2.04 Gear Case Assembly ....3.2.05 Pull-up Roller Assembly ....3.2.06 Upper Cover, Access Cover, and Sheet Guide Assemblies ....3.2.07 Control Board (AKGI) ....3.2.08 Power Supply Assembly ....3.2.09 Operator Panel PCB (LEOP) ....3.2.10 PC Connector ....3.2.11 Space Motor and Roller Guide Assemblies ....3.2.12 Carriage Cable ....3.2.13 Space Rack ....3.2.14 Roller/Holder Backup Assembly ....3.2.15 Guide Rail and Adjust Cam ....3.2.16 Left Ground Plate ....3.2.17 Right Ground Plate ....3.2.18 Rear and Cut Sheet Paper Feed Sensor Levers ....3.2.19 Platen Assembly ....3.2.20 Paper Chute Assembly ....3.2.21 Line Feed Motor Assembly ....3.2.22 Reset Spring ....3.2.23 Idle Gear and Change Lever ....3.2.24 Pressure Spring ....3.2.25 Carriage Shaft ....3.2.26 Leaf Spring ....3.2.27 Bottom Paper Sensor Levers ....3.2.28 Front Pressure Roller Assembly ....3.2.29 Tractor Assembly ....3.2.30 Main Frame 3.3 Printer Adjustments ....3.3.02 Printhead Gap Adjustment ....3.3.03 Key Combinations
Page 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125
Table of Contents ....3.3.04 Menu Operation ........Printing the Menu ........Reset Menu to Factory Defaults ........Limited Operation ........Procedure ........Menu Settings ....3.3.05 Top of Form ....3.3.06 Paper Park ....3.3.07 Tear Feature ....3.3.08 Forms Tear Off 3.4 Cleaning ....3.4.02 Cleaning Schedule ....3.4.03 Cleaning Tools ....3.4.04 Areas to be Cleaned 3.5 Lubrication 3.6 Shipping Instructions 4 Failure & Repair Analysis 4.1 Introduction ....4.1.02 Printer Serial Number Identification 4.2 Reporting Problems 4.3 Troubleshooting Updates 4.4 Troubleshooting Tips - Preliminary Checks ....4.4.02 Problem Categories ....4.4.03 Start Here Flowchart ....4.4.04 Tips for Preventing Image Problems ....4.4.05 Common Problems 4.5 Abnormal Output & Output Samples ........Left Margin Drifting Problem 4.6 Fault Alarms ....4.6.02 Alarm/LED Display Troubleshooting Table Index ....4.6.03 Alarm/LED Display Troubleshooting Tables 4.7 Repair Analysis Procedures (RAPs) ....4.7.01 Using the RAPs ....4.7.02 RAP Index ........RAP 01 No Power Supplied to Printer ........RAP 02 No Spacing Operation ........RAP 03 Printhead Homing Error ........RAP 04 Paper Jam During Paper Loading ........RAP 05 Printhead Pins Not Firing ........RAP 06 Poor Print Quality ........RAP 07 Ribbon Feed Problem ........RAP 08 Line Feed Problem ........RAP 09 Operation Panel Malfunction ........RAP 10 Parallel Interface Problem
Page 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168
Table of Contents ........RAP 11 Serial Interface Problem 4.8 Printer Tests ....4.8.02 Rolling ASCII Test ....4.8.03 Font Test ....4.8.04 Serial Interface Loopback Test ........Serial Cable Information ........Commonly Used Serial Cable Configurations ....4.8.05 Hexadecimal Dump Mode 4.9 Resistance Checks ....4.9.02 Printhead Interconnect Diagram: Control Board to Printhead ....4.9.03 Line Feed Motor Resistance ....4.9.04 Space Motor Resistance A Reference Charts General Information A.2 Index To Charts ....Interconnect Diagram ....A.2.01 Main Controller Board (AKGI) ....A.2.02 Operator Panel Board (LEOP) ....A.2.03 Power Supply Assembly ....A.2.04 Space Motor Board ....A.2.05 RS232-C Serial Interface Board (LXHI) Option B Illustrated Parts Listing General Information ....B.1.02 Definition of Terms ....B.1.03 Parts Ordering Information B.2 Charts ....Board Overview ....B.2.01 Printer ....B.2.02 Upper Cover Assembly ....B.2.03 Printer General Assembly ....B.2.04 Printer Unit (1 of 3) ....B.2.05 Printer Unit (2 of 3) ....B.2.06 Printer Unit (3 of 3) ....B.2.07 Carriage Assembly ....B.2.08 Options ....B.2.09 Option Parts ....B.2.10 Consumables ....B.2.11 Packing Materials ....B.2.12 Documentation ....B.2.13 Service Training Kit Revision List
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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 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)
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Service Guide ML590/ML591
Chapter 0 About This Manual
© 1994 by Okidata All rights reserved. First Edition Second Revision Third Revision Second Edition Fourth Revision October, 1992 March, 1993 August, 1993 April, 1994 April, 1994 P/N 59256301
P/N 59256302
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)
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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)
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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 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)
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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)
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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)
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Service Guide ML590/ML591
Chapter 1 Product Specifications
1.5
AGENCY APPROVALS
1.5.01 Listings UL No: CSA No: FCC: IEC: VDE: BS:
UL Standard No. 1950 CSA Standard 22.2-950 FCC Certified per Part 15, Subject J, Class B IEC 950 VDE 0805 VDE 0875 Class B BS 7002
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Chapter 1 Product Specifications
1.6.01 Character Matrix Sizes Table of Print Speed and Character Matrix Mode Speed Matrix (H x V) LQ 120 (12 cpi) 29 x 18 Utility 360 (12 cpi) 9 x 17 High Speed Draft 450 (15 cpi) 7 x 17
Print Speed at Different CPI for the ML 590 Mode Utility CPI 10 12 15 17.1 20 LQ 10 12 15 17.1 20 CPS 300 360 450 257 300 100 120 150 171 200 Horiz. DPI 120 120 120 240 240 360 360 360 360 360 Vert DPI 180 180 180 180 180 180 180 180 180 180 IPS 30 30 30 15 15 10 10 10 10 10
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Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.02 Characters Per Line Microline 590 Characters Per Line 80 96 120 136 160 Characters Per Inch 10 12 15 17.1 20 Utility Letter Quality
164 161 148 96 95
65 65 65 65 65
Microline 591 Characters Per Line 136 163 204 233 272 Characters Per Inch 10 12 15 17.1 20 Utility Letter Quality
105 96 88 59 59
40 40 40 40 40
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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
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Chapter 1 Product Specifications
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 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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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)
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Chapter 1 Product Specifications
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
1.6.07 Front Panel Switches Select Menu Mode Line Feed Form Feed Top of Form Quiet Micro Feed Up / Down Paper Park Pitch Selection Print Quality Selection Tear
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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)
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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)
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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 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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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)
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Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.12 Menu Mode Print: Group: Item: Set: Exit: Prints the entire menu. Selects Group Function Selects Item Selects Item Value Exits Menu Mode, Enters Select
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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 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
1.6.14 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)
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Chapter 1 Product Specifications
1.6.15 Paper Loading Auto Loading (Top Feed) Press LOAD switch for Bottom/Rear Feed
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
1.6.16 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)
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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)
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Service Guide ML590/ML591
Chapter 1 Product Specifications
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.
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Chapter 1 Product Specifications
Printhead Gap Information Three items factor into printhead gap information. 1. Printhead Gap Adjustment This is a SERVICE ADJUSTMENT made by a technician. 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 MENU ITEM in the SET-UP Group. 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 MENU ITEM in each [Paper Feed] Group. The Groups are REAR FEED, BOTTOM FEED, and TOP FEED. Gap Control determines how the printhead gap is set. The settings are listed below. Auto Gap, Semi Auto Gap, 1, 2, 3, 4, 5, 6, 7, 8, 9 An explanation of each setting follows. 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.
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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)
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Service Guide ML590/ML591
Chapter 1 Product Specifications
1.6.20 Print Speed Table of Print Speed and Character Matrix Mode Speed Matrix (H x V) LQ 120 (12 cpi) 29 x 18 Utility 360 (12 cpi) 9 x 17 High Speed Draft 450 (15 cpi) 7 x 17
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Chapter 1 Product Specifications
1.7
PAPER SPECIFICATIONS CAUTION: Use Bottom Feed and/or optional Pull Tractor for card stock and labels.
1.7.01 Types Card Stock Weight: Width: Length: Thickness: Paper Feed Path: Printhead Gap Information: Continuous Form Weight: Single Part Multi-Part Carbonless Multi-Part, Interleaf Paper Width: Length: Thickness:
120 lbs. (450 g/m2) Maximum Microline 590 5 to 8 inches (12.7 to 20.3 centimeters) Microline 591 5 to 14 inches (12.7 to 35.6 centimeters) 3 to 17 inches (7.62 to 43.18 centimeters) .017 inches (0.44 millimeters) Bottom Refer to the Printhead Gap Information, Section 1.6 .
12 - 24 lb. (45 to 90 g/m2) 9 - 11 lb. (35 to 40 g/m2)
10 - 12 lb. (38 to 45 g/m2) Carbon 9 lb. (35 g/m2) Microline 590 3.5 to 10.5 inches (8.8 to 26.6 centimeters) Microline 591 3.5 to 16.5 inches (8.8 to 41.9 centimeters) 3 to 17 inches (7.62 to 43.18 centimeters) 0.014 inches (0.36 millimeters) Rear Feed 0.017 inches (0.44 millimeters) Bottom Feed Rear or Bottom Refer to the Printhead Gap Information, Section 1.6
Paper Feed Path: Printhead Gap Information: Cut Sheet Weight: Width: Width: Length: Thickness: Paper Feed Path: Printhead Gap Information: Envelopes Weight: Size:
12 to 24 lbs. (45 to 90 g/m2) 7.2 to 14.3 inches (18.3 to 36.3 centimeters) Microline 590 7.2 to 8.5 inches (18.2 to 21.5 centimeters) Microline 591 7.2 to 14.3 inches (18.2 to 36.3 centimeters) 3 to 17 inches (7.62 to 43.18 centimeters) 0.014 inches (0.325 millimeters) Maximum Top Refer to the Printhead Gap Information, Section 1.6. .
24 lbs. (90 g/m2)
Maximum
Single Feed 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) Continuous Non-overlap type Thickness: .014 inches (.325 millimeters) Maximum Paper Feed Path: Bottom Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6. Labels Weight: Width: Length: Thickness: Paper Feed Path: Printhead Gap Information:
.
N/A Microline 590 3.5 to 10.5 inches (8.8 to 26.6 centimeters) Microline 591 3.5 to 16.5 inches (8.8 to 41.9 centimeters) 3 to 17 inches (7.62 to 43.18 centimeters) .011 inches (0.28 mm) Maximum (including backing) Bottom 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/ high humidity conditions. 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) Microline 591 7.2 to 14.3 inches (18.2 to 36.3 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. . 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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Chapter 1 Product Specifications
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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1.9
CONSUMABLES
1.9.01 Ribbon CAUTION: Using a non-Okidata ribbon may damage the printhead and void any warranties. Material Cartridge Fabric Types Black Ribbon Color Ribbon Magenta Yellow Cyan Black Life (On average, at 10 characters per inch, Utility Mode) 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
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1.10
OPTIONS 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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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.) 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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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 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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1.10.03 Color Ribbon Kit Includes: Color mechanism Color Ribbon End user installable
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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 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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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 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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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 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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1.10.07 Bitstream Facelift 2.0 For Windows 3.0 and 3.1 Includes: 14 scalable fonts 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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1.10.08 OKISmart Typer Utility Packaged with printer Includes: Typewriter Mode, Form Creation Utility and Barcode Utility 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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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 1.11.05 Ribbon Life Black: Color: Black: Cyan: Magenta: Yellow:
Approximately 4 million characters Approximately 1.5 million characters Approximately 1.5 million characters Approximately 1.5 million characters Approximately 0.8 million characters
1.11.06 Warranty (Limited) Two years, parts and labor 1.11.07 Service Authorized Okidata Service Centers
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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 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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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.
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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.
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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.
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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.
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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.
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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.
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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. Note: A Reset operation initiated by I-PRIME does not reset the MPU. 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.
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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.
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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.
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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.
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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. 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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Print Compensation Control The printhead compensates for the shape of the platen as shown below. Note: Refer to Section 2.1.08 - Head Drive Time
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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.
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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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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.
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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. 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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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.
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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.
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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
Actual Voltage (+40 vdc)
Passes Required 1 1 1 2
Relative Print Speed
+34 vdc or greater +32 vdc to +34 vdc +30 vdc to +32 vdc +30 vdc or less
100% Approximately 85% Approximately 50% Less than 50%
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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.
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2.1.09 Power Supply Circuit The switching type power supply circuit supplies the +5 vdc, +/-8 vdc, +12 vdc and +40 vdc.
Table of Output Voltages Voltage / Signal +5 vdc +8 vdc -8 vdc +12 vdc +40 vdc ALM Purpose IC logic levels LED drive voltages Serial interface line voltage comparator IC Serial interface line voltage Printhead analog circuit Printhead space motor and line feed motor drive voltage Output from the main control board upon detection of an 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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2.2
MECHANICAL OPERATION
The following section explains the mechanical operation of the printer. 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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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.
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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.
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Line Feed Motor Resistance The resistance of each coil should be approximately 13 ohms.
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Space Motor Resistance The resistance of each coil should be approximately 5 ohms.
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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. 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.
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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). 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.
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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. 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.
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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
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
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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.
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)
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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
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 Status of Front Pressure Roller Tension of Front Pressure Roller Status of Rear Pressure Roller OPEN CLOSED OPEN Tension of Rear Pressure Roller
Bottom Top Rear
OPEN CLOSED CLOSED
N/A 250 g 90 g
N/A 700 g 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)
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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. 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)
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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. When using cut sheet paper, the change lever must be in the TOP position so the platen and 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)
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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 i