Detailed instructions for use are in the User's Guide.
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Service Guide ML380
Chapter 0 About This Manual
ML380 Dot Matrix Printer
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 ML380
0 About This Manual Front Cover Manual Copyright 1 Product Specifications 1.1 Overview 1.2 Physical Specifications 1.3 Power Requirements 1.4 Environmental Conditions 1.5 Agency Approvals 1.6 Operational Specifications 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 Microprocessor 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 ....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 Semi-Automatic Sheet Feeder (SASF) ....2.2.07 Paper Park 3 Maintenance & Disassembly 3.1 Maintenance - General Information ....3.1.02 Maintenance Tools ....3.1.03 Maintenance Precautions 3.2 Disassembly/Assembly Procedures - General Information ....3.2.01 Paper Separator ....3.2.02 Printhead ....3.2.03 Upper Cover Assembly ....3.2.04 Space Rack 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
Table of Contents ....3.2.05 Ribbon Feed Gear Assembly ....3.2.06 Mini-Pitch (Space) Belt ....3.2.07 Head Connector Assembly ....3.2.08 Main Control Board (UMMB) ....3.2.09 Operation Panel ....3.2.10 Line Feed Motor ....3.2.11 Photosensor Assembly (Paper End) ....3.2.12 Bail Arms ....3.2.13 Carriage Frame ....3.2.14 Platen Assembly ....3.2.15 Pressure Roller Assembly ....3.2.16 Paper Pressure Guide ....3.2.17 Tractor Assembly ....3.2.18 Microswitch Assembly (SASF) ....3.2.19 Microswitch Assembly (Home Position Switch) ....3.2.20 Printer Mechanism ....3.2.21 Power Supply Unit ....3.2.22 Space Motor Assembly ....3.2.23 Bottom Paper Guide Lever 3.3 Printer Adjustments ....3.3.02 Gap Between Platen and Printhead ....3.3.03 Space Belt Tension ....3.3.04 Key Combinations ....3.3.05 Menu Operation / Menu Select Mode - General Information ........From Print Mode ........From Power-OFF ........Printing the Menu ........Sample Menu ........Reset Menu to Factory Defaults ........Limited Operation ........Menu Settings ....3.3.06 Top of Form ....3.3.07 Paper Park ....3.3.08 Paper Tear Off ....3.3.09 Resets 3.4 Cleaning 3.5 Lubrication 3.6 Shipping Instructions 4 Failure & Repair Analysis 4.1 Failure & Repair Analysis - Introduction ....4.1.02 Printer Serial Number Identification ....4.1.03 Firmware Revision Identification 4.2 Reporting Problems - General Information
Page 39 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 80
Table of Contents ....4.2.02 Problem Lists ....4.2.03 Reporting Methods 4.3 Troubleshooting Updates General Information 4.4 Troubleshooting Tips ....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 4.6 Fault Alarms - General Information ....4.6.02 Fault Alarm Lamp Display 4.7 Repair Analysis Procedures (RAPS) - Using The RAPS ....4.7.02 RAP Index ........RAP 01: No Power ........RAP 02: Space Operation Does Not Operate Normally ........RAP 03: Wrong Character or Missing Dots ........RAP 04: Line Feed Trouble ........RAP 05: Data Receiving Failure 4.8 Printer Tests - General Information ....4.8.02 Rolling ASCII Test ....4.8.03 Font Test ....4.8.04 Serial Interface Loopback Test - General Information ........Loopback Connector Configuration Diagram ........Procedure ........Serial Cable Information ........Serial Interface Signal Requirements ........Commonly Used Serial Cable Configurations ....4.8.05 Hexadecimal Dump Mode 4.9 Resistance Checks - General Information ....4.9.02 Main Control Board (UMMB) Voltage Check Points ....4.9.03 Connectors Block Diagram ....4.9.04 Connector Location ....4.9.05 Resistance Diagrams - Printhead ........Space and Line Feed Motors ....4.9.06 Head Cable Connection A Board Diagrams A1 Board Diagrams - General Information A.2 Index To Charts ....A.2.01 Main Control Board (UMMB) Original ....A.2.02 Main Control Board (UMMB) Current ....A.2.03 RS232-C Serial Module (UMRS) B Illustrated Parts Listing B.1 Overview - General Information ....B.1.02 Definition of Terms
Page 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122
Table of Contents ....B.1.03 Parts Ordering Information B.2 Charts ....B.2.01 Printer ....B.2.02 Covers ....B.2.03 Printer Unit ....B.2.04 Printer Mechanism (1 of 3) ....B.2.05 Printer Mechanism (2 of 3) ....B.2.06 Printer Mechanism (3 of 3) ....B.2.07 Option Parts ....B.2.08 Consumables ....B.2.09 Packaging ....B2.10 Documentation ....B.2.11 Service Training Kit Revision List
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Service Guide ML380
Chapter 0 About This Manual
Manual Copyright 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. © 1994 by Okidata All rights reserved. First Edition August, 1989 P/N 59238701 Second Edition September, 1993 P/N 59238702 Third Edition November, 1994 P/N 59238703 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. 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 is a registered trademark of International Business Machine 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 ML380
Chapter 1 Product Specifications
1.1 OVERVIEW 1.1.01 General Information The Microline 380 is an 80 column, impact dot matrix printer using a 24 pin printhead. It emulates the Epson LQ printer. A push tractor is standard. An optional pull tractor is available. Font and Character Pitch selection is available through the operator panel, printer menu, or through software (using control codes). A Centronics Parallel interface is standard. An RS232-C serial module is available as an option. 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 ML380
Chapter 1 Product Specifications
1.2 PHYSICAL SPECIFICATIONS 1.2.01 Dimensions Width: 15.67 inches (398 millimeters) Depth: 4.72 inches (120 millimeters) Height: 13.58 inches (345 millimeters)
NOTE: Dimensions DO NOT INCLUDE the platen knob, acoustic cover, and paper separator.
1.2.02 Weight 17.9 pounds (8.1 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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Service Guide ML380
Chapter 1 Product Specifications
1.3 POWER REQUIREMENTS 1.3.01 Input Power 120 VAC: +5.5 / -15% 220/240 VAC: +5.5 / -15% Single-phase AC 1.3.02 Power Consumption Operating: 90 VA Idle: 30 VA 1.3.03 Power Frequency 120 VAC: 50/60 Hz +/- 2% 220/240 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 ML380
Chapter 1 Product Specifications
1.4 ENVIRONMENTAL CONDITIONS 1.4.01 Acoustic Rating 57 dBA 1.4.02 Altitude 10,000 feet (3,050 meters) 1.4.03 Ambient Temperature and Relative Humidity (RH) While operating: 41 to 95 degrees Fahrenheit (5 to 35 degrees Celsius) Operating humidity: 20% to 80% RH While in storage: -40 to 158 degrees Fahrenheit (-40 to 70 degrees Celsius) Storage humidity: 5% to 95% RH 1.4.04 Impact Non-operating: 3 G or less 1.4.05 Vibration Operating: 0.3 G (5 to 150 Hz) or less (except at resonating frequency) Non-Operating: 1 G (5 to 150 Hz) or less (except at resonating frequency) 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 ML380
Chapter 1 Product Specifications
1.5 AGENCY APPROVALS
1.5.01 Listings UL No: UL Standard No. 478 and 114 CSA No: CSA Standard C22.2 No. 154 FCC: FCC Certified per Part 15, Subject J, Class B VDE: VDE 0806, 0875 Class B, and 0836 BS: BS 5850 / 6204 IEC: 435 / 380 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 ML380
Chapter 1 Product Specifications
1.6 OPERATIONAL SPECIFICATIONS 1.6.01 Character Matrix Sizes Table of Print Speed and Character Matrix Mode Speed Matrix (H x V) LQ 63 cps (12 cpi) 30 x 18 Utility 192 cps (12 cpi) 9 x 17 HS Utility 240 cps (15 cpi) 7 x 16
1.6.02 Characters Per Line Maximum Characters Per Line 80 96 120 137 160 10 12 15 17.1 20 Characters Per Inch
1.6.03 Character Pitches 5, 6, 8.5, 10, 12, 15, 17.1, 20 characters per inch Characters Per Inch = cpi The character pitches are selected through the following methods. Operator panel (front panel controls) Menu Select Mode (Menu Mode) Control codes in the software Special Microline 380 drivers 1.6.04 Character Sets Standard ASCII EPSON Character Set IBM Character Set I and II Foreign Language Sets (14) Line Graphics Zero / Slashed Zero 1.6.05 Emulation Epson LQ 1.6.06 Fonts
Letter Quality Courier Letter Gothic Prestige Orator Roman Helvette Draft Utility Special Font Effects Emphasized / Enhanced Outline Shadow Double Height Double Width 1.6.07 Front Panel Switches SELECT / Exit FEED / Group TOF / PARK / Item FONT / Set PITCH / Print 1.6.08 Graphics Resolution Graphics Resolution Maximum: 180 x 360 dpi Minimum: 60 x 72 dpi *1.6.09 Interface Standard Parallel Optional RS232C Serial, 19.2 Kbytes Super-Speed (Ready/Busy, X-ON / X-OFF) NOTE: When the serial interface module is installed, the printer's parallel interface connector is NOT accessible. 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/180 inch 1.6.11 Line Feed Time 2.2 inches per second 1.6.12 Menu Mode Print: Prints the entire menu. Group: Selects Group Function Item: Selects Item Set: Selects Item Value Exit: Exits Menu Mode, Enters Select 1.6.13 Paper Feed Methods
Standard Friction Feed (Top) Push Tractor (Rear) Optional Pull Tractor (Bottom / Rear) Single-Bin Cut Sheet Feeder (Top) CSF 3800 1.6.14 Paper Feed Paths Top Feed (Standard) Rear Feed (Standard) Bottom Feed (by using an Optional feed mechanism) Special Features Paper Park Semi-Automatic Sheet Feeding Paper Tear Off 1.6.15 Paper Loading Semi-Automatic Sheet Feeding Opening the paper bail arm activates the semi-automatic sheet feeder (SASF) 1.6.16 Paper Out Detection Distance from end of paper Rear Feed: 2.3 inches (57 millimeters) Bottom Feed: 1.4 inches (36 millimeters) Top Feed: 1 inch (25 mm) 1.6.17 Paper Tear Capabilities Paper Tear-0ff (sharp edge on access cover) 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 is between 90 and 129 degrees Celsius (ALARM 1), the printer stops bi-directional p ...
