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Service Guide ML393/ML393CPlus
Chapter 0 About This Manual
ML393Plus // ML393C Plus 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
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Service Guide ML393/ML393CPlus
0 About This Manual Front Cover Copyright 1 Specifications 1.1 Overview - General Information/Specifications 1.2 Physical Specifications 1.3 Power Requirements 1.4 Environmental Conditions 1.5 Agency Approvals 1.6 Operational Specifications - Character Matrix Sizes ....1.6.02 Characters Per Line ....1.6.03 Character Pitches ....1.6.04 Character Sets ....1.6.05 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 ....1.6.19 Print Modes ....1.6.20 Print Speed 1.7 Paper Specifications 1.8 Memory Specifications 1.9 Consumables 1.10 Options 1.11 Reliability 2 Principles of Operation 2.1 Principles of Operation - General Information ....2.1.02 Microprocessors (MPUs) and Peripheral Circuits ....2.1.03 Initialization ....2.1.04 Interface Control ....2.1.05 Printhead Drive Circuit ....2.1.06 Spacing Drive Circuit ....2.1.07 Line Feed Circuit 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
Table of Contents ....2.1.08 Alarm Circuits ....2.1.09 Paper End Detection Circuit ....2.1.10 Power Supply 2.2 Mechanical Operation - Printhead Mechanism ....2.2.02 Spacing ....2.2.03 Ribbon Drive ....2.2.04 Paper Feed ....2.2.05 Paper-End Detection ....2.2.06 Paper Park ....2.2.07 Automatic Paper Loading 3 Maintenance 3.1 Maintenance - General Information 3.2 Disassembly/Assembly Procedures - General Information ....3.2.01 Preliminary Items, Printhead ....3.2.02 Ribbon Guide ....3.2.03 Ribbon Protector ....3.2.04 Upper Cover Assembly ........Parts List ....3.2.05 Operator Panel Assembly ....3.2.06 Control Board (LQEM) ....3.2.07 Interface Connector Board (LQPN) ....3.2.08 Printer Mechanism ....3.2.09 Platen Assembly ....3.2.10 Line Feed Motor ....3.2.11 Printhead Cable Assembly ....3.2.12 Sensor Board ....3.2.13 Ribbon Feed Assembly ....3.2.14 Space Motor Assembly ....3.2.15 Space Belt ....3.2.16 Bail/Ribbon Motor Assembly ....3.2.17 Paper Bail Assembly ....3.2.18 Carriage and Carriage Shaft ........Parts List ....3.2.19 Paper Pressure Guide ....3.2.20 Printhead Gap / Release Lever Microswitches ....3.2.21 Push Tractor Assembly ........Procedure - Installation Notes ....3.2.22 Power Supply Unit ....Microline 393C-Plus - Color Model Only : Sections 3.2.23 through 3.2.28 ........3.2.23 Ribbon Shift Arm Spring / Ribbon Shift Arm : Microline 393C-Plus - Color Model Only ........3.2.24 Roller Lever : Microline 393C-Plus - Color Model Only
Page 40 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
Table of Contents ........3.2.25 Ribbon Guide : Microline 393C-Plus - Color Model Only ........3.2.26 Bail Open Cam and Bail Open Gear : Microline 393C-Plus - Color Model Only ........3.2.27 Ribbon Shift Cam and Ribbon Shift Gear : Microline 393C-Plus - Color Model Only ........3.2.28 Ribbon Shift Cam Lever Assembly : Microline 393C-Plus - Color Model Only ....Cut Sheet Feeder - Option : Sections 3.2.29 Through 3.2.35 ........3.2.29 Friction Sheet ........3.2.30 Rear Bin ........3.2.31 Side Cover ........3.2.32 Roller Supports and Rollers (H) ........3.2.33 Control Board ........3.2.34 Connection Cord ........3.2.35 Motor Assembly 3.3 Printer Adjustments - General Information ....3.3.02 Printhead Gap Adjustment ....3.3.03 Line Feed Belt Tension ....3.3.04 Color Adjustment (Microline 393C-Plus Printer) ....3.3.05 Key Combinations ....3.3.06 Menu Operation - General Information ........Menu Mode ........Menu Print ........Sample Menu ........Menu Settings ........Menu Reset ........Limited Operation ....3.3.07 Top of Form ....3.3.08 Paper Park ....3.3.09 Forms Tear Off ....3.3.10 Resets 3.4 Cleaning 3.5 Lubrication - General Information ....3.5.02 Lubrication Schedule ....3.5.03 Lubrication Types and Amounts ....3.5.04 Areas Not Lubricated ....Lubrication Points (Monochrome and Color) ....Platen, Carriage Shaft, Idle Gear ....Ribbon Feed Assembly ....Lubrication Points (Color) ....Lubrication Points (Options) 3.6 Shipping Instructions 4 Failure Analysis
Page 80 81 82 83 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
Table of Contents 4.1 Overview 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 ........Epson / IBM, Self Test Revision 1.16 (FCO 7681) ........Missing Spaces When Printing Wide Reports (FCO 7693) ........Self Test Revisions 1.07 and 1.10 (FCO 7730) ........Parallel Timing Specification Changes ........Jumper SP2 Added to Main Control Board ........Font Name Changes in Menu Mode ........Modifications to Q6, Main Control Board 4.5 Abnormal Output 4.6 Fault Alarms 4.7 Repair Analysis Procedures (RAPS) ....RAP 01: Power Lamp Does Not Light ....RAP 02: Space Error (ALARM 57) ....RAP 03: Head Homing Error (ALARM 53) ....RAP 04: Ribbon Homing Error (ALARM 5B) ....RAP 05: Bail Home Error (ALARM 5C) ....RAP 06: Wrong Character, Character Omission, or Dot Omission ....RAP 07: Ribbon Feed Trouble ....RAP 08: Line Feed Trouble ....RAP 09: Malfunction of Operator Panel Switch ....RAP 10A: Data Receive Failure ....RAP 10B: Parallel Interface Problem ....RAP 10C: Serial Interface Problem ....RAP 10D: Data Receive Failure (Alarm Light Lit) ....RAP 11: Color Ribbon Shift Problem 4.8 Printer Tests - General Information ....4.8.02 Rolling ASCII Print Test ....4.8.03 Font Test ....4.8.04 Serial Interface - Loopback Test ....4.8.05 Hexadecimal Dump 4.9 Resistance Checks - General Information ....4.9.02 Printhead Resistance Check ....4.9.03 Line Feed Motor Resistance Check ....4.9.04 Space Motor Resistance Check ....4.9.05 Ribbon Motor Resistance Check A Board Diagrams
Page 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160
Table of Contents A.1 Overview - General Information A.2 Index To Charts ....A.2.01 Main Control Board (LQEM) ....A.2.02 Power Supply ....A.2.03 Interface Board (LQPN) ....A.2.04 Sensor Board (LQEW or LPRW) ....A.2.05 Operator Panel Board (LQSX) B Illustrated Parts Listing B.1 Overview - General Information ....B.1.02 Definition of Terms ....B.1.03 Parts Ordering Information B.2 Charts ....B.2.01 Printer Unit ....B.2.02 Upper Cover Assembly ....B.2.03 Printer Unit General Assembly (1 of 2) ....B.2.04 Printer Unit General Assembly (2 of 2) ....B.2.05 Operator Panel Assembly ....B.2.06 Printer Mechanism - Monochrome (1 of 3) ....B.2.07 Printer Mechanism - Monochrome (2 of 3) ....B.2.08 Printer Mechanism - Monochrome (3 of 3) ....B.2.09 Printer Mechanism - Color (1 of 3) ....B.2.10 Printer Mechanism - Color (2 of 3) ....B.2.11 Printer Mechanism - Color (3 of 3) ....B.2.12 Carriage Assembly - Monochrome ....B.2.13 Carriage Assembly - Color ....B.2.14 Options ....B.2.15 Pull Tractor Assembly (Option) ....B.2.16 Packing Materials ....B.2.17 Consumables ....B.2.18 Documentation ....B.2.19 Service Training Kit Revision List C Microline 393/393C Specifications C.1 Overview - General Information C.2 Printer Specifications C.3 Paper Specifications C.4 Physical Specifications C.5 Power Requirements C.6 Environmental Conditions C.7 Agency Approvals C.8 Options C.9 Consumables C.10 Memory Specifications C.11 Printer Reliability
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Service Guide ML393/ML393CPlus
Chapter 0 About This Manual
Microline 393 / 393C-Plus Service Handbook
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. © 1995 by Okidata All rights reserved. First Edition April 1990P/N 59241601 Second Edition February 1995P/N 59241602 Written and produced by the Okidata Sales and Product Training Please address any comments on this publication to: Sales and Product Training Okidata 532 Fellowship Road Mount Laurel, NJ 08054-3499 Fax Number: (609) 222-5320 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. Centronics is a registered trademark of Centronics Inc. PLUG 'n PRINT is a registered trademark of Oki America, Inc.; marque deposee de Oki America, Inc. Epson is a registered trademark of Seiko Epson Corporation. IBM, Proprinter and Proprinter XL are registered trademarks of International Business Machines, Inc. 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 ML393/ML393CPlus
Chapter 1 Specifications
1.1 OVERVIEW 1.1.01 General Information The Microline 393-Plus and Microline 393C-Plus are high speed, dot matrix printers, which utilize a 24 pin printhead. The Microline 393-Plus is the standard version (monochrome). The Microline 393C-Plus is the color capable version. The printers are capable of emulating the Epson LQ-2550 and the IBM Proprinter XL24 printers. Both an RS232-C Serial Interface and a Centronics Parallel Interface are standard. 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 ML393/ML393CPlus
Chapter 1 Specifications
1.2 PHYSICAL SPECIFICATIONS 1.2.01 Dimensions
NOTE: Dimensions INCLUDE the platen knob, acoustic cover, and paper separator.
Width: 25.2 inches (54 centimeters) Depth: 19 inches (48.3 centimeters) Height: 8 inches (20.3 centimeters) 1.2.02 Printer Weight 37 pounds (16.8 kilograms) UPS Shippable 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 Specifications
1.3 POWER REQUIREMENTS 1.3.01 Input Power 120 VAC: +10 / -15% 220 VAC: +10 / -15% 1.3.02 Power Consumption Operating: 180 VA Idle: 50 VA 1.3.03 Power Frequency 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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Chapter 1 Specifications
1.4 ENVIRONMENTAL CONDITIONS 1.4.01 Acoustic Rating Letter Quality Mode 58 dBA Quiet Mode 54 dBA 1.4.02 Altitude 10,000 feet (3,048 meters) 1.4.03 Ambient Temperature and Relative Humidity (RH) While operating: 41 to 104 degrees Fahrenheit (5 to 40 degrees Celsius) Operating humidity: 20% to 90% RH While in storage: -40 to 158 degrees Fahrenheit ( - 40 to 70 degrees Celsius) 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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Chapter 1 Specifications
1.5 AGENCY APPROVALS 1.5.01 Listings UL No: UL Standard No. 478 CSA No: CSA Standard C22.2 (220) FCC: FCC Class 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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Chapter 1 Specifications
1.6 OPERATIONAL SPECIFICATIONS 1.6.01 Character Matrix Sizes Table of Print Speed and Character Matrix Mode Letter Quality Near Letter Quality Utility High Speed Draft Speed 140 cps 210 cps 415 cps 520 cps Matrix (Horizontal x Vertical) @ cpi 30 x 18 @ 12 cpi 15 x 18 @ 12 cpi 9 x 17 @ 12 cpi 7 x 17 @ 15 cpi
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 ML393/ML393CPlus
Chapter 1 Specifications
1.6.02 Characters Per Line Characters Per Line 136 163 204 233 272 PS Characters Per Inch (Maximum) 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)
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1.6.03 Character Pitches 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)
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Chapter 1 Specifications
1.6.04 Character Sets Standard ASCII EPSON Character Set I & II IBM Character Set I, II & All Characters 16 Foreign Language Sets Zero / Slashed Zero DLL - 2 Sets of 128 characters
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 ML393/ML393CPlus
Chapter 1 Specifications
1.6.05 Emulations
NOTE: The emulations are co-resident
Epson LQ IBM XL24 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 ML393/ML393CPlus
Chapter 1 Specifications
1.6.06 Fonts Standard Courier Swiss Roman Orator Optional Font Cartridges Prestige Letter Gothic 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 ML393/ML393CPlus
Chapter 1 Specifications
1.6.07 Front Panel Switches SELECT Paper Park / Top of Form Quiet (Menu) Mode Font Selection Line Feed Pitch Selection FORM FEED Print Quality Selection 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 Specifications
1.6.08 Graphics Resolution 60 (horizontal) x 60 (vertical) dots per inch (DPI) minimum 360 (horizontal) x 360 (vertical) dots per inch (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 Specifications
1.6.09 Interface Standard Centronics Parallel 19.2K Super-Speed Serial RS232C 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 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 Specifications
1.6.11 Line Feed Time 55 ms @ 6 LPI 8.0 IPS (inches per second) slew rate @ gap 1,2 6.0 IPS (inches per second) slew rate @ gap 3+ 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 Specifications
1.6.12 Menu Mode Switch Print Group Item Set Exit Action Prints the entire menu. Selects Group Function Selects Item Selects Item Value 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)
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Chapter 1 Specifications
1.6.13 Paper Feed Methods Standard Friction Feed (Top) Rear Push Tractor (Rear) Optional Pull Tractor (Bottom) Cut Sheet Feeder (Top) CSF 30001 - Single Bin CSF 30002 - Dual Bin 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 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 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 Specifications
1.6.15 Paper Loading Refer to the Setup Guide or Section 2.2 loading. of this Service Handbook for information on paper
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 Specifications
1.6.16 Paper Out Detection Distance from end of paper Rear Feed: 2.3 inches (5.84 centimeters) Bottom Feed: .94 inches (2.388 centimeters) Cut Sheet: .93 inches (2.362 centimeters) 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 Specifications
1.6.17 Paper Tear Capabilities Tear Bar (for 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 Specifications
1.6.18 Print Method Printhead Type General Information Impact: Dot Matrix 24 pin printhead .0078 inch (0.20 millimeter) diameter pins Overheat Protection When printhead temperature reaches 115 to 125 degrees Celsius, the printer stops bi-directional printing. Uni-directional printing begins. If the temperature exceeds 125 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
Printhead Gap Information Two 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 0.017, +/- 0.001 inches (0.43, +/- 0.03 mm). 2. Printhead Gap Adjust This is a manual adjustment performed by the end-user. It is performed by moving the blue head gap lever, located on the right side of the printer. The settings are 1, 2, 3, 4, 5, 6, 7, 8, 9 1 is the smallest (narrowest) gap. 9 is the largest (widest) gap.
Setting 1 2 3-4
Paper Type 12 - 15 lb. paper 20 - 24 lb. paper Labels
3-4 4-5 7 5-9
Two-part forms Three-part forms Four-part forms Envelopes
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 Specifications
1.6.19 Print Modes Letter Quality Near 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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1.6.20 Print Speed Pitch 10 cpi 12 cpi 15 cpi 17.1 cpi 20 cpi 10 cpi 12 cpi 15 cpi 17.1 cpi 20 cpi Head Gap Setting 1,2 1,2 1,2 1,2 1,2 3+ 3+ 3+ 3+ 3+ 450 cps 450 cps 517 cps 517 cps High Speed Draft Utility 345 cps 414 cps 258 cps 295 cps 345 cps 300 cps 360 cps 225 cps 257 cps 300 cps 150 cps 180 cps Near Letter Quality 172 cps 207 cps Letter Quality 115 cps 138 cps 172 cps 196 cps 230 cps 100 cps 120 cps 150 cps 171 cps 200 cps
cpi - Characters Per Inch cps - Characters Per Second
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 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: 100 lbs. (375 g/m 2 ) Maximum Width: 5 to 14 inches (12.7 to 35.6 centimeters) Length: 3 to 17 inches (7.62 to 43.18 centimeters) Thickness: .014 inches (0.36 millimeters) Paper Feed Path: Bottom Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6 Continuous Form Weight: Single Part 12 - 24 lb. (45 to 90 g/m 2 ) Multi-Part, Carbonless 9 - 11 lb. (35 to 40 g/m 2 ) Multi-Part, Interleaf Paper 10 - 12 lb. (38 to 45 g/m 2 ) Carbon 9 lb. (35 g/m 2 ) Width: 3.5 to 15.5 inches (8.8 to 41.9 centimeters) Length: 3 to 17 inches (7.62 to 43.18 centimeters) Thickness: 0.014 inches (0.36 millimeters) maximum Paper Feed Path: Rear or Bottom Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6 Cut Sheet Weight: 12 to 24 lbs. (45 to 90 g/m 2 ) Width: 7.2 to 16 inches (18.3 to 40.6 centimeters) Length: 3 to 17 inches (7.62 to 43.18 centimeters) Thickness: 0.002 to .0049 inches (0.5 to 0.12 millimeters) Paper Feed Path: Top Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6. Envelopes Weight: 24 lbs. (90 g/m 2 ) Maximum Size:
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: N/A Width: 3.5 to 15.5 inches (8.8 to 41.9 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 / high humidity conditions.
Weight: 12 to 24 lbs. (45 to 90 g/m 2 ) Width: 7.2 to 16 inches (18.2 to 40.6 centimeters) Length: 3 to 17 inches (7.62 to 43.18 centimeters) Thickness: 0.14 inches (0.36 millimeters) maximum 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 + 3 Interleaf Original + 3 Carbonless Original Cut Sheet 1.7.04 Thickness 0.014 inches / 0.36 mm Maximum 1.7.05 Weight
NOTE: The recommended weight is specific to paper type. Minimum: 12 lb. (45 g/m 2 )
Maximum: 100 lb. (375 g/m 2 ) 1.7.06 Width
NOTE: The recommended width is specific to paper type.
Paper Minimum: 3.5 inches ( 8.8 centimeters) Maximum: 16 inches (40.6 centimeters)
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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1.8 MEMORY SPECIFICATIONS 1.8.01 ROM 128 Kbytes Resident Program ROM 384 Kbytes Resident Fonts 64 Kbytes each Optional Font Cartridges 1.8.02 RAM Total RAM = 64 Kbytes Print Buffer 23 Kbytes Epson I/F Buffer 8 Kbytes IBM I/F Buffer 0 Kbytes (minimum) DLL Buffer 0 to 32 Kbytes 1.8.03 EEPROM Internal Control, Menu = 256 bits 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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1.9 CONSUMABLES 1.9.01 Black Ribbon Cartridge Microline 393-Plus and Microline 393C-Plus Type: Fabric Ribbon Ribbon Life: 5 million characters 1.9.02 Color Ribbon Cartridge Microline 393C-Plus Type: Four band color ribbon (Yellow, Magenta, Cyan, Black) Ribbon Life: Black: 2.3 million characters Cyan: 1.8 million characters Magenta: 1.8 million characters Yellow: 1.3 million characters 1.9.03 Film Ribbon Can be used in both the Microline 393-Plus and Microline 393C-Plus. Ribbon Life 400K Characters at 10 cpi in letter quality mode CAUTION:
Using a non-Okidata ribbon may damage the printhead and void any warranties.
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 OPTIONS 1.10.01 Cut Sheet Feeders Single Bin, CSF 30001 Single Bin with envelope capability Paper Width: 7.2 to 8.5 inches (18.3 to 21.7 centimeters) Paper Length: 10.1 to 14 inches (25.7 to 35.6 centimeters) Capacity: 170 sheets (16 lb.), 100 sheets (24 lb.) Dual Bin, CSF 3002 Dual Bin with envelope capability Paper Width: 7.2 to 8.5 inches (18.3 to 21.7 centimeters) Paper Length: 10.1 to 14 inches (25.6 to 35.6 centimeters) Capacity: 170 sheets (16 lb.), 100 sheets (24 lb.) 1.10.02 Pull Tractor Kit
NOTES: A Pull Tractor Assembly MUST be used to feed labels. The Pull Tractor Assembly is required for bottom feeding.
Bottom Feed Rear Feed (For Push/Pull Operation) Paper Types: Continuous Feed and Labels 1.10.03 RAM Buffer Expansion Card 32 kbytes 1.10.04 Font Cartridges Prestige Gothic 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 Specifications
1.11 RELIABILITY 1.11.01 Mean Time Before Failure (MTBF) Approximately 4,000 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 12,000 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 Approximately 4 million characters 1.11.06 Warranty (Limited) One year, parts, labor, and printhead 1.11.07 Service Authorized Okidata Service Centers 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 2 Principles of Operation
2.1 ELECTRICAL OPERATION 2.1.01 General Information The Control Board consists of the microprocessor and its peripheral circuits, the drive circuits. The power to the Control Board is supplied by the power supply unit. The power to the other electrical parts is distributed via the connectors on the Control Board. 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 2 Principles of Operation
2.1.02 Microprocessors (MPUs) and Peripheral Circuits Microprocessors (Q16: 83C154UGS and Q11: 80C154VGS) The Microprocessors are the nucleus of the control circuit. The peripheral circuits operate under program control by these microprocessors. The Master MPU (Q16) controls the interface, code processing and the Slave MPU. The Slave MPU (Q11) controls the spacing and printing functions. Program ROM for Master MPU (Q6: 27512) This Program ROM contains the control program for the printer. The master microprocessor operates by execution of this program. Program ROM for Slave MPU (Q17: 2764) This Program ROM contains the control program for the printer. The slave microprocessor operates by execution of this program. DRAM (Q18 and Q19) The Dynamic RAM chips, each consisting of 64x4 Kbits, are used as the Receive Buffer and Print Buffer. The total buffer size is 64x8 Kbits. CGROM (Q7) This is a 1 Mbit ROM which stores the resident character fonts. EEPROM (Q20) This 256-bit serial Electrically Erasable and Programmable ROM stores the menu data. Motor Control LSI (Q9: MSM6990) This LSI controls the functions listed below. Space Motor Speed Control To obtain the carriage speed instructed by the Microprocessor, the LSI generates the pulse switch timing and overdrive time Dot ON Timing generation I/O Port (Input port used to read Operator Panel switches) Address Latch (for lower 8 bits of the slave MPU) LSI (Q8: MSM74H002) This LSI drives the 24 pin printhead. The following describes the function of the LSI. Printhead Drive Control Printhead Drive Correction Modifies the drive time under the following circumstances Correction for edge pin driving Correction for drive voltage fluctuations
Correction for head gap setting Interface LSI (Q12: MSM60306) The MSM60306 is an external interface LSI and controls the following functions. Interface Control Controls both the parallel and serial interface functions Pin 4 of this LSI enables selection of the serial or parallel interface Address Latch (for lower 8 bits of the master MPU) MMU (Memory Management Unit) LSI (Q13: MSM73003) This LSI is connected between the Master and Slave MPUs and performs these functions. LED Drive Output Port Master/Slave MPU Interface Transfers commands and data between the Master and Slave MPUs Memory Control Extends the addressable memory by switching banks in/out Dynamic RAM Refresh Block Diagram of Microline 393 / 393C-Plus
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.1.03 Initialization The printer is initialized whenever the power is turned ON or when the I-PRIME signal is received at the parallel interface. Initialization is started when the RST-P signal is sent from the reset circuit to the MPUs and LSIs. When RST-P is generated, ROM program execution starts with the mode setting of Q8, Q9, Q12 and Q13. Next, ROM and RAM are checked for errors, RAM is initialized and the carriage, bail and ribbon (color model only) are homed. The program finally establishes the interface signals (output level of ACK, BUSY, etc.), then turns the SELECT lamp ON to inform the host computer that the printer is ready to receive data. 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 2 Principles of Operation
2.1.04 Interface Control The printer is capable of serial or parallel operation. The desired interface method is selected by sliding the interface cover to expose the desired connector. When this is done, the interface select switch is turned ON or OFF to inform the Interface Control LSI (Q12) of the selected interface. Parallel Interface When the interface select switch is turned OFF, the parallel interface is selected and the Interface Control LSI is in the parallel mode. The data from the interface is received through connector (CN-1) and the Interface LSI (Q12) latches this data to the internal register in the LSI at the rising edge of the STB-N signal. The BUSY signal is turned ON as the data is processed. When processing is completed, the BUSY signal is turned OFF and an ACK signal is sent to the host to request more data. The BUSY signal is also turned ON when the printer is not able to receive data (buffer is full, printer is deselected or an error condition exists).
RS232-C Serial Interface When the interface select switch is turned ON, the serial interface is selected and the Interface Control LSI is in the serial mode.
Then the RS232-C interface signals (DSR, CTS, CD and RD) are converted to TTL levels by the line receiver (Q2) and input to the Master MPU, Slave MPU and MMU. The Master MPU converts the serial data to parallel data. The interface signals (DTR, RTS, SSD and TD) output from the Master MPU and Interface LSI are converted from TTL levels to RS232-C levels by the line driver (Q2) and sent to the serial interface connector.
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Chapter 2 Principles of Operation
2.1.05 Printhead Drive Circuit This circuit is used to drive the twenty-four (24) print wires. The signals HD1 through HD24 control the individual print wires. The HD ON signal (even/odd trigger) enables the drive circuit when printing is desired. The head drive duration is determined by an RC integrating circuit, which modifies the HD ON pulse width. The pulse width of the HD ON signal varies with the number of pins being driven. Printhead Drive Time The drive time increases as more pins are driven. The drive time decreases as less pins are driven. The drive time also increases if the head gap lever is placed in positions 4 through 9. An RC circuit is also used to compensate for the fluctuation of drive voltage (+38 vdc).2-1-04B.pcx
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Chapter 2 Principles of Operation
2.1.06 Spacing Drive Circuit The Motor Control LSI (Q9) outputs the SPMO DA signal upon receiving the spacing command from the Slave MPU (Q11). This is a fixed cycle pulse signal. To control the motor speed, the Motor Control LSI varies the pulse duty cycle according to the speed data from the Slave MPU. The SPMO FOW or SPMO REV signal from the Head Control LSI (Q8) changes the current direction in the DC motor to run the motor in either the forward or reverse direction. As the space motor rotates, it generates feedback pulse signals SP Phase A and SP Phase B. The Motor Control LSI detects the edge pulses from these signals and divides the frequency to output the MO LSI IPT signal for use in Dot Timing.
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Chapter 2 Principles of Operation
2.1.07 Line Feed Circuit The Line Feed Motor Shaft is held stationary by +8 vdc supplied according to the pulse duty cycle of the LFCHOP signal (the holding current is approximately 30 ma) whenever in a stopped position. During line feed operation, the Line Feed Motor is driven by +38 vdc in accordance with the LFOVDV-N signal. The signals LF Phase 1 through LF Phase 4 establish the proper phase relationship for driving the motor.
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Chapter 2 Principles of Operation
2.1.08 Alarm Circuits Fault Alarm Circuit (in Power Supply Unit) This protective circuit turns off the Power Supply when a fault occurs in the printhead, line feed, or bail/ribbon motor drive circuits, thus preventing secondary component failure. To accomplish this, the circuit monitors the overdrive signal of each drive circuit. If the duration of any drive circuit exceeds a predetermined length of time, the appropriate signal (HDE ALM, HDO ALM, LF COM or RBN COM) will be sent to the fault alarm circuit. The fault alarm circuit generates the ALM signal (high) which causes the power supply to turn all DC power OFF. Printhead Overheat Alarm Circuit In order to protect the printhead coils, this circuit monitors the printhead temperature by using a thermistor contained in the printhead. The CPU senses this circuit every time a line is printed. When printing, the printhead temperature rises. If the head temperature reaches approximately 115 to 125 degrees Celsius, a head overheat condition (ALARM 1) is generated. When ALARM 1 is detected, bi-directional printing stops. Uni-directional printing continues. If the printhead temperature continues to rise, ALARM 2 is generated. All printing stops. Printing resumes when the head temperature falls below the ALARM 1 level. Cover Open Alarm Circuit When the front access cover is opened, the COVOPEN-N signal is sent to the Slave MPU from the cover interlock microswitch. The Slave MPU relays the switch status to the Master MPU. The Master MPU will halt printing at the completion of the current line and light the ALARM Lamp.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.1.09 Paper End Detection Circuit Whenever the Release Lever is in the Continuous Feed position, Paper End is detected by the microswitch on the Push Tractor (rear feed) or the Paper End sensor on the sensor board (bottom feed). Whenever the Release Lever is in the Sheet Feed position, Paper End is detected by a photosensor located in the paper pressure guide. When the printer detects an out of paper condition, the PE-N signal goes low. Printing stops. The ALARM LAMP is turned ON. 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 2 Principles of Operation
2.1.10 Power Supply This switching power supply converts the AC input voltage to +5 vdc, +/-8 vdc and +38 vdc for use throughout the printer. Voltage / Signal Table Voltage/Signal +5 vdc +8 vdc -8 vdc +38 vdc POW ALM Purpose IC Logic Levels - LED Drive Voltage Serial Interface Logic Levels - Line Feed Motor Locking Voltage Serial Interface Logic Levels Printhead Space Motor Line Feed Motor Bail/Ribbon Motor Drive Voltage This signal is sent by the Power Supply in the event of an abnormal temperature rise in the power supply unit or an overcurrent condition of the +38 vdc. The Main Control Board suppresses this condition by temporarily suspending printing. If the condition does not change the Main Control Board will enable the FAN ALARM (Alarm 60) Refer to Section 4 of this Service Handbook. This signal is sent by the Main Control Board when an of an overdrive condition is detected in either the printhead line feed motor or bail/ribbon motor drive circuits. The power supply disables the + 38 vdc output when this signal is detected.
ALM
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Chapter 2 Principles of Operation
2.2 MECHANICAL OPERATION 2.2.01 Printhead Mechanism The printer uses a highly efficient stored energy type printhead. Power is not consumed until the printwires are activated. This extends printhead life to approximately 200 million characters. The printhead uses 24 printwires (two columns of 12 wires each). Each wire is welded to an armature. Behind this armature is a spacer ring. Each of the 24 printwire armatures have a permanent magnet behind them. The magnets attract the armatures, drawing the printwires into the wire guide. This keeps the wires inside the printhead. A coil is wrapped around each of the permanent magnets. When a dot is to be printed, current passes through the appropriate coil. This creates an electromagnetic field which opposes the magnetic field of the permanent magnet. The armature springs forward. The print wire (which is attached to the armature) strikes the ribbon and prints a dot on the paper. When current is removed from the coil, the magnetic field of the permanent magnet attracts the armature, retracting the printwire into the wire guide. The printhead contains a built-in thermistor used to monitor the printhead temperature. The parts listed below make up the printhead.
Wire Guide Print Wires Armature Assembly Spacer Permanent Magnet Assembly Thermistor Printed Circuit Board with Coils
Head Gap Adjusting The head gap adjusting mechanism adjusts the gap between the platen and printhead. Move the adjusting lever on the left side of the printer mechanism to change the head gap. When the lever is moved, the carriage shaft rotates. The carriage shaft is attached to the printer mechanism with eccentric collars. As the carriage shaft rotates, the distance between the platen and carriage shaft changes. Two 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 0.017, +/- 0.001 inches (0.43, +/- 0.03 mm).
2. Printhead Gap Adjust This is a manual adjustment performed by the end-user. It is performed by moving the blue head gap lever, located on the right side of the printer. The settings are 1, 2, 3, 4, 5, 6, 7, 8, 9 1 is the smallest (narrowest) gap. 9 is the largest (widest) gap.
Setting 1 2 3-4 3-4 4-5 7 5-9
Paper Type 12 - 15 lb. paper 20 - 24 lb. paper Labels Two-part forms Three-part forms Four-part forms Envelopes
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Chapter 2 Principles of Operation
2.2.02 Spacing Spacing is performed when the space motor drives the carriage along the carriage shaft, parallel to the platen. The spacing mechanism consists of the items listed below. Space Motor Drive Pulley Idle Pulley Carriage Shaft Carriage Frame Space Belt Spacing Operation The carriage containing the printhead moves parallel to the platen along the main carriage shaft. Power from the space motor is transferred via the space belt, which is attached to the bottom of the carriage frame. The carriage is designed to move 0.8 inches when the servo motor performs one rotation.
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Chapter 2 Principles of Operation
2.2.03 Ribbon Drive The ribbon drive mechanism moves the ribbon in synchronization with the space motor operation. The ribbon drive mechanism consists of the items listed below. Ribbon Drive Assembly Ribbon Cartridge Ribbon Cartridge An endless ribbon with a single direction feed is used. Ink is supplied from an ink tank, which is built-in to the ribbon cartridge. Ribbon Feed Operation The rotation of the space motor is transmitted to the drive gear in the ribbon cartridge through the ribbon feed gear assembly. This feeds the ink ribbon. The feed direction of the ribbon is maintained by switching the rotational direction of the gears in the ribbon drive assembly. This ensures uni-directional ribbon movement when bi-directional printing is used.
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Chapter 2 Principles of Operation
2.2.04 Paper Feed Paper feeding is performed by turning the platen and the pin tractor, which is driven by the line feed pulse motor. The paper feed mechanism consists of the items listed below. Pulse Motor (with gears) Idler Gear Change Spring Change Gear Platen Tractor Feed Unit Paper Pressure Guide Friction Feed When the release lever is set to the SHEET FEED position, the change gear is disengaged from the tractor gear. At the same time, the release lever applies pressure to push the pressure rollers against the platen, allowing paper to be fed.
Tractor Feed When the release lever is set to the TRACTOR FEED position, the release lever allows the reset spring to push the change gear toward the tractor gear. At the same time, the release lever pushes the pressure rollers away from the platen, allowing paper to be fed by the tractors.
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Service Guide ML393/ML393CPlus
Chapter 2 Principles of Operation
2.2.05 Paper-End Detection Cut-Sheet Paper-End When the release lever is in the SHEET FEED position, the photosensor located in the paper pressure guide is active. If sheet paper is installed, the paper is detected by the sensor and the sensor is activated (ON). When the printer is out of sheet paper, the sensor is deactivated (OFF), indicating a paper-end condition.
Bottom Feed Paper-End This is used with optional Pull Tractor. When the release lever is in the TRACTOR FEED position, the switch on the left push tractor and the paper-end sensor on the sensor board are active. If paper is detected by either of these sensors, paper-end is inhibited. When bottom feed paper is installed, it moves the bottom paper-end lever to turn the sensor ON. When a paper out condition exists, the lever blocks the sensor, indicating a paper-end condition.
Rear Feed Paper-End When the release lever is in the TRACTOR FEED position, the switch on the left push tractor and the paper-end sensor on the sensor board are active. If paper is detected by either of these sensors, paper-end is inhibited. When rear feed paper is installed, pressure is placed on the microswitch, located in the left push tractor. Since the switch is turned ON, paper is detected.
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Chapter 2 Principles of Operation
2.2.06 Paper Park General Information Paper park allows the user to switch from continuous feed paper to single-sheet paper without removing the continuous feed paper from the printer. The continuous feed paper will be retracted from the platen and down into the printer housing without disengaging it from the built-in tractor. After a single-sheet paper is printed, pull the bail lever forward and the continuous feed paper will move back into the print position. Paper park cannot be used when the optional pull tractor is installed. The operation of the Paper Park feature is listed below. Press PARK/TOF. Reverse line feed retracts the paper until a paper-end condition exists or until 14 inches of paper has been retracted. The paper will remain on the push tractor, but out of the printing path. Procedure: Continuous Feed to Single Sheet 1. Tear off any printed pages. 2. Make sure the printer is selected. The SELECT lamp must be lit. 3. Press PARK / TOF. 4. The paper will retract from the paper path. 5. Move the paper selection to the single sheet position (towards the back of the printer). 6. Raise the paper support to its upright position. 7. Align the left paper guide with the paper icon on the support. 8. Place a piece of paper in the paper support. 9. Position the right paper guide to accommodate the right edge of paper. 10. Press FORM FEED to feed single-sheet paper into the printer. 11. Print the single sheet. Procedure: Single Sheet to Continuous Feed 1. Remove any single-sheet paper in the printer. 2. Move the paper selection lever to the continuous form position (to the front of the printer). 3. Lower the paper support. 4. Press FORM FEED to feed continuous feed paper into the printer. 5. The paper will advance to the loading position. 6. Adjust the top of form (if necessary).
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Chapter 2 Principles of Operation
2.2.07 Automatic Paper Loading Automatic Paper Loading is used to consistently set the print start position when using cut-sheet or continuous sheet paper. The procedure is listed below. Cut-Sheet Paper 1. Push the Paper Release Lever to the Cut-Sheet position. 2. Insert the paper from behind the platen. 3. Press the FORM FEED switch. 4. The Paper Bail will automatically open. 5. The Line Feed operation will load the paper. 6. The Paper Bail will automatically close.
NOTE: If the paper does not move, the Auto-Load motion becomes invalid and is treated like an ordinary paper-end.
Continuous Sheet (Rear Feed) SASF 1. Push the Paper Release Lever to the Continuous Sheet side (front of printer). 2. Insert the paper into the push tractor. DO NOT allow the front edge of the paper to extend beyond the white line of the left tractor assembly. The white guide line MUST BE visible. 3. Press the FORM FEED switch. 4. The Paper Bail will automatically open. 5. The Line Feed operation will load the paper. 6. The Paper Bail will automatically close.
NOTE: If the paper does not advance after the line feed motor has fed the equivalent of 2.4 inches of paper, the Auto-Load process stops. This situation is treated like an ordinary paper-end condition.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.1 MAINTENANCE 3.1.01 General Information This section lists the parts replacement, adjustment, cleaning, lubrication, and shipping procedures. Disassembly should not be performed unless absolutely necessary. NEVER perform disassembly on a malfunctioning unit until you have followed the failure analysis procedures in Section Four of this Service Handbook. Follow the procedures listed in Adjustments and Service Settings. Adjustments may be required when either consumables or parts are replaced. Failure to perform these procedures could result in unnecessary service calls. Cleaning procedures must be performed correctly if high print quality is to be achieved. 3.1.02 Maintenance Items The following items are required to service the unit. Disassembly / Adjustments #1 Phillips Screwdriver (with magnetic tip) #2 Phillips Screwdriver (with magnetic tip) #3 Phillips Screwdriver (with magnetic tip) Straight-slot Screwdriver Needle Nose Pliers (4 inch) Diagonal Cutters Tension Gauge (capable of measuring 1 pound of pressure) 7 mm open-ended wrench Ruler (capable of measuring 1/16 inch increments) 3/32 inch socket with driver Feeler Gauge Digital Multimeter Cleaning / Lubrication Shop Vacuum Cloth (soft and lint-free) All-Purpose Cleaner Platen Cleaner Contact Kleen (Okidata P/N 51802301) Machine Grease
Machine Oil 3.1.03 Maintenance Precautions 1. Do not disassemble the unit if it is operating normally. 2. Before starting disassembly and assembly, always power OFF the unit and detach the AC power cord. 3. Detach the interface cable, if installed. 4. Do not remove parts unnecessarily. Try to keep disassembly to a minimum. 5. Use the recommended maintenance tools. 6. When disassembling, follow the listed sequence. Failure to follow the correct sequence may result in damaged parts. 7. Since screws, collars and other small parts are easily lost, they should be temporarily attached to the original positions. 8. Use extreme care when handling circuit boards. Integrated circuits (microprocessors, ROM, and RAM) can be destroyed by static electricity. 9. Do not place printed circuit boards directly on conductive surfaces. 10. Follow the recommended procedures when replacing assemblies and units. 11. When replacing the main control board, be sure to remove any socketed PROMS and EEPROMS. Replacement printed circuit boards are shipped WITHOUT these items. When removing PROMs and EEPROMs, you MUST follow standard Electrostatic Sensitive Device (ESD) safety precautions or you may damage the components. 12. Perform the line feed belt tension adjustment when any of the following occur. Erratic line spacing occurs Parts are replaced Line Feed Belt (3.2.09 ).
13. Perform the color adjustment when any of the following occur. Colors "bleed" into one another Parts are replaced Ribbon Shift Cam and Ribbon Shift Gear (3.2.27 Ribbon Shift Cam Lever Assembly (3.2.28 ) )
14. Perform the printhead gap adjustment procedure (Refer to Section 3.3 of this Service Handbook ) when any of the following occur. Poor Print Quality Uneven Print Quality (darker on one side of the document). Excessive wear on the printhead or platen Parts are replaced Printhead (3.2.01 ) ) )
Platen Assembly (3.2.09
Space Motor Assembly (3.2.14
Carriage Shaft (3.2.18
)
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Chapter 3 Maintenance
3.2 DISASSEMBLY/ASSEMBLY PROCEDURES General Information This section contains the printer disassembly procedures. Only the removal procedures are explained here. Reverse the procedure for the installation. At the bottom of each procedure is a listing of the parts covered in that procedure. The Okidata part number, item description, comment (RSPL, Option, Consumable) and cross-reference to Appendix B is provided for each part. Items included in the Recommended Spare Parts List are indicated by the acronym RSPL. N/A will appear where a part number is not available. Part Item Comment Appendix B Number Description Reference This Service Handbook lists the disassembly procedures for major components of the unit. Okidata DOES NOT recommend disassembling a unit which is operating normally. If you decide to perform disassembly during this training, Okidata recommends that you perform only the disassembly procedures for RSPL items. All other procedures are provided to assist you in identifying parts. It is not likely that you will perform these procedures while servicing the unit. Be sure to read all notes, cautions, and warnings, as they contain important information regarding disassembly / assembly. Microline 393C-Plus Only (Color Version) 3.2.23 Ribbon Shift Arm and Shift Arm Spring 3.2.24 Roller Lever 3.2.25 Ribbon Guide 3.2.26 Bail Open Cam and Bail Open Gear 3.2.27 Ribbon Shift Cam and Ribbon Shift Gear 3.2.28 Ribbon Shift Cam Lever Assembly Cut Sheet Feeder - Option 3.2.29 Friction Sheet 3.2.30 Rear Bin 3.2.31 Side Cover 3.2.32 Roller Supports and Rollers (H) 3.2.33 Control Board 3.2.34 Connection Cord 3.2.35 Motor Assembly
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Chapter 3 Maintenance
3.2.01 Preliminary Items, Printhead WARNING: The printhead will be HOT immediately after printing. 1. Power OFF the printer and detach the AC power cord (1). 2. Detach the interface cable, if installed. [Not Shown] 3. Open the printer access cover. 4. Remove the ribbon cartridge (2). 5. Place the head gap adjusting lever (3) to the range 9 position. 6. Remove the two mounting screws (4). 7. Lift the printhead (5) from the connector to remove it.
NOTE: When installing the printhead, pull the printhead towards the stopper (in the direction of Arrow A). Perform the printhead gap adjustment after installation. Refer to Section 3.3 of this Service Handbook for further information.
P/N 56609701 Cord: AC Power (120 vac) RSPL B.2.03 P/N 56624101 Cable: AC 220V (ML) Right Ang RSPL B.2.03 P/N 70000803 Kit: Parallel Interface Plug n Play Option B.2.14 P/N 70012801 Kit: RS232-C Serial Interface Cable Option B.2.14 P/N 52103801 Cartridge: Film Ribbon (Black) Consumable B.2.04 P/N 52103601 Cartridge: Ribbon (Black) Consumable B.2.04 P/N 52103701 Cartridge: Ribbon (Color) Consumable B.2.04 P/N 50054202 Printhead: (Mylar Comp) RSPL B.2.03 , B.2.17 Accessory (Cable)
, B.2.17 , B.2.17
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3.2.02 Ribbon Guide 1. Remove the printhead (3.2.01 ).
2. Remove the two mounting screws (1). 3. Lift the ribbon guide (2) and remove it. P/N 53055901 Guide: Ribbon (Black) RSPL B.2.12
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Chapter 3 Maintenance
3.2.03 Ribbon Protector 1. Remove the printhead (3.2.01 ). ).
2. Remove the ribbon guide (3.2.02
3. Remove the two mounting screws (1). 4. Lift the ribbon protector (2) and remove it. P/N 53527001 Protector: Ribbon RSPL B.2.12 , B.2.13
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.04 Upper Cover Assembly Procedure 1. Disconnect the interface cable (1). 2. Remove the font cartridge or buffer expansion cartridge (2) if installed. 3. Detach the two platen knobs (3). 4. Remove the two cover mounting screws (4) at the rear of the printer. 5. Lift the rear access cover (5) to the open position. 6. Lift the upper cover assembly at the back and tilt it towards the front to remove it.
NOTES: When installing the upper cover assembly, perform the actions listed below. Move the release lever (6) towards the front of the printer. Move the bail arm lever (7) towards the back of the printer. Check that the paper bail moves properly. When cleaning, refer to Section 3.4 of this Service Handbook. The upper cover assembly includes the middle cover, the access cover, the rear cover, the bail lever, the paper separator, and the sheet insertion guide. Refer to Appendix B of this Service Handbook for details.
The parts list appears on the following pages.
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Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
Parts List P/N 70000803 Kit: Parallel Interface Plug n Play Option B.2.14 Accessory (Cable) P/N 70012801 Kit: RS232-C Serial Interface Cable Option B.2.14 P/N 70010201 Gothic Font Cartridge Option B.2.03 P/N 70010101 Prestige Font Cartridge Option B.2.03 , B.2.14 , B.2.14 , B.2.14
P/N 70016401 Cartridge: 32 Kbyte RAM Expansion Option B.2.03 P/N 53478601 Knob: Platen RSPL B.2.03 P/N 50212427 Cover: Middle (ML393+) RSPL B.2.02 P/N 50212426 Cover: Middle (ML393C+) RSPL B.2.02 P/N 50212306 Cover: Access (Monochrome) RSPL B.2.02 P/N 50212307 Cover: Access (Color) RSPL B.2.02 P/N 50212504 Cover: Rear RSPL B.2.02 P/N 53482901 Lever: Bail B.2.02 , B.2.04
P/N 51001901 Separator: Paper B.2.02 P/N 53482801 Guide: Sheet Insertion B.2.02
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 ML393/ML393CPlus
Chapter 3 Maintenance
3.2.05 Operator Panel Assembly 1. Remove the upper cover assembly (3.2.04 ).
2. Disconnect the operator panel cable (1) from CN10 (2) on the control board. 3. Remove the two mounting screws (3). 4. Detach the operator panel holder (4) by moving it upward, and then pulling toward the front of the printer. 5. Remove the three mounting screws (5). 6. Open the eleven claws and detach the operator panel (6) from the operator panel holder. P/N 55050601 PCB: Operator Panel (LQSX) RSPL B.2.05 P/N 53479103 Panel: Operator RSPL B.2.05 P/N 56614608 Cable: Operator Panel RSPL B.2.05 P/N 50910505 Spring: Cover Open RSPL B.2.05 P/N 56614301 Cable: Microswitch (Cover Open) RSPL B.2.05 P/N 53535301 Lever: Cover Open B.2.05
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: 58
Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.06 Control Board (LQEM) 1. Remove the upper cover assembly (3.2.04 2. Remove the ribbon cartridge. 3. Release the lock of connector CN10 (1) and detach the operator panel cable (2). 4. Remove the five shield cover mounting screws (3). 5. While slightly lifting the shield cover (4), detach connector CN13 (5) from the control board (6), then remove the shield cover. 6. Detach the remaining connectors from the control board. 7. Loosen the mounting screw and remove the control board. ).
NOTES: Installation Do not allow cables to get caught under the control board. Insert the control board into the groove in the base tray (7). Place the board into the groove (8) in the shield cover, then attach the shield cover. When replacing the main control board, be sure to remove any socketed PROMS and EEPROMS. Replacement printed circuit boards are shipped WITHOUT these items. This board has a 2.0 Amp, 125V fuse. If SP1 is OPEN, an Internal ROM is present. If SP1 is SHORTED - External ROM SP3 must be OPEN for a Monochrome Model. It must be SHORTED for a Color Model.
CAUTION:
When removing PROMs and EEPROMs, you MUST follow standard Electrostatic Sensitive Device (ESD) safety precautions or you may damage the components.
P/N 55050411 PCB: Main (LQEM-1) Black RSPL B.2.03 P/N 55050412 PCB: Main (LQEM-2) Color RSPL B.2.04 P/N 56619201 Cord: I/F Main PCB Connection (50 Pin) RSPL B.2.03 P/N 55938501 IC: EEPROM BR93CS46-2-NW RSPL B.2.04 P/N 56301703 Fuse: 2A, 125V B.2.04
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: 59
Service Guide ML393/ML393CPlus
Chapter 3 Maintenance
3.2.07 Interface Connector Board (LQPN)
NOTE: To allow easier access to the mounting screw and cables, configure the interface connector board to use the serial interface connector.
1. Remove the upper cover assembly (3.2.04 ).
2. Disconnect connectors CN102 (1) and CN103 (2). 3. Remove the two mounting screws (3). 4. Lift the interface connector board (4). 5. Detach connector CN101 (5). 6. Remove the interface connector board.
NOTE: After assembly, configure the interface connector board (if necessary).
P/N 55034501 PCB: LQPN-Interface Connection RSPL B.2.03 [Assembly]
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX)