User manual OKI MICROLINE 521

Microline 520/521 Service Handbook P/N 59257803 Microline 520/521 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. © 1994 by Okidata All rights reserved. February, 1993 September, 1993 December, 1994 P/N 59257801 P/N 59257802 P/N 59257803 First Edition Second Edition Third Edition 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 Table of Contents COURSE ADMINISTRATION: OVERVIEW ................................................................................................................................. i-1 RECOMMENDATIONS .............................................................................................................. i-2 INFORMATION UPDATES........................................................................................................ i-3 NOTICES...................................................................................................................................... i-3 WHERE TO SEND TESTING MATERIALS ............................................................................. i-4 MISSING ITEMS OR MISSING PAGES.................................................................................... i-5 COURSE PATH ........................................................................................................................... i-6 SERVICE TRAINING.................................................................................................................. i-7 SERVICE AUTHORIZATION .................................................................................................. i-11 General Information........................................................................................................ i-11 Answer Sheet: Microline 520/521 ................................................................................. i-13 Course Critique: Microline 520/521 .............................................................................. i-14 Certification Test: Microline 520/521............................................................................ i-16 SECTION ONE: SPECIFICATIONS 1.1 1.2 OVERVIEW .................................................................................................................... 1-1 1.1.01 General Information.......................................................................................... 1-1 PHYSICAL SPECIFICATIONS ..................................................................................... 1-2 1.2.01 Dimensions ....................................................................................................... 1-2 1.2.02 Printer Weight................................................................................................... 1-2 POWER REQUIREMENTS............................................................................................ 1-3 1.3.01 Input Power....................................................................................................... 1-3 1.3.02 Power Consumption.......................................................................................... 1-3 1.3.03 Power Frequency .............................................................................................. 1-3 ENVIRONMENTAL CONDITIONS.............................................................................. 1-4 1.4.01 Acoustic Rating................................................................................................. 1-4 1.4.01 Altitude ............................................................................................................. 1-4 1.4.03 Ambient Temperature and Relative Humidity (RH)........................................ 1-4 1.3 1.4 i 1.5 1.6 AGENCY APPROVALS................................................................................................. 1-5 1.5.01 Listings.............................................................................................................. 1-5 OPERATIONAL SPECIFICATIONS ............................................................................. 1-6 1.6.01 Character Matrix Sizes...................................................................................... 1-6 Table of Print Speed and Character Matrix ............................................................... 1-6 1.6.02 Characters Per Line........................................................................................... 1-6 Microline 520............................................................................................................. 1-6 Microline 521............................................................................................................. 1-6 1.6.03 Character Pitches .............................................................................................. 1-6 1.6.04 Character Sets ................................................................................................... 1-7 1.6.05 Emulations ........................................................................................................ 1-7 1.6.06 Fonts.................................................................................................................. 1-8 Near Letter Quality .................................................................................................... 1-8 Utility ......................................................................................................................... 1-8 High Speed Draft ....................................................................................................... 1-8 Bar Code .................................................................................................................... 1-8 1.6.07 Front Panel Switches......................................................................................... 1-8 1.6.08 Graphics Resolution.......................................................................................... 1-8 1.6.09 Interface ............................................................................................................ 1-8 Standard ..................................................................................................................... 1-8 Optional...................................................................................................................... 1-8 1.6.10 Line Feed Increments........................................................................................ 1-9 Fixed .......................................................................................................................... 1-9 Variable...................................................................................................................... 1-9 1.6.11 Line Feed Time ................................................................................................. 1-9 1.6.12 Menu Mode....................................................................................................... 1-9 1.6.13 Paper Feed Methods........................................................................................ 1-10 Standard ................................................................................................................... 1-10 Optional.................................................................................................................... 1-10 1.6.14 Paper Feed Paths ............................................................................................. 1-10 1.6.15 Paper Loading ................................................................................................. 1-10 1.6.16 Paper Out Detection........................................................................................ 1-10 1.6.17 Paper Tear Capabilities ................................................................................... 1-10 1.6.18 Print Method ................................................................................................... 1-11 Printhead Type ......................................................................................................... 1-11 General Information........................................................................................... 1-11 Overheat Protection ........................................................................................... 1-11 Printhead Gap Information....................................................................................... 1-12 1.6.19 Print Modes..................................................................................................... 1-14 ii 1.6.20 Print Speed ...................................................................................................... 1-14 Table of Print Speed and Character Matrix ............................................................. 1-14 1.7 PAPER SPECIFICATIONS .......................................................................................... 1-15 1.7.01 Types............................................................................................................... 1-15 Card Stock................................................................................................................ 1-15 Continuous Form ..................................................................................................... 1-15 Cut Sheet.................................................................................................................. 1-16 Envelopes................................................................................................................. 1-16 Labels....................................................................................................................... 1-17 Transparency............................................................................................................ 1-17 1.7.02 Length ............................................................................................................. 1-18 1.7.03 Number of Copies ........................................................................................... 1-18 1.7.04 Thickness ........................................................................................................ 1-18 1.7.05 Weight............................................................................................................. 1-19 1.7.06 Width............................................................................................................... 1-19 Paper ........................................................................................................................ 1-19 Printing Area ............................................................................................................ 1-19 MEMORY SPECIFICATIONS..................................................................................... 1-20 1.8.01 EEPROM ........................................................................................................ 1-20 1.8.02 EPROM........................................................................................................... 1-20 1.8.03 RAM ............................................................................................................... 1-20 CONSUMABLES.......................................................................................................... 1-21 1.9.01 Ribbon............................................................................................................. 1-21 OPTIONS....................................................................................................................... 1-22 1.10.01 Cut Sheet Feeders ........................................................................................... 1-22 Single Bin................................................................................................................. 1-22 Dual Bin ................................................................................................................... 1-22 1.10.02 Pull Tractor Kit .............................................................................................. 1-23 1.10.04 Bottom Push Tractor Kit ................................................................................ 1-23 1.10.05 Serial Interface ................................................................................................ 1-23 1.10.06 Roll Paper Stand ............................................................................................. 1-24 1.10.08 OKISmart Typer Utility .................................................................................. 1-24 1.10.09 OKISmart Panel Utility................................................................................... 1-24 RELIABILITY............................................................................................................... 1-25 1.11.01 Mean Time Before Failure (MTBF) ............................................................... 1-25 1.11.02 Mean Time To Repair (MTTR) ...................................................................... 1-25 1.11.03 Printer Life ...................................................................................................... 1-25 1.11.04 Printhead Life.................................................................................................. 1-25 1.11.05 Ribbon Life .................................................................................................... 1-25 1.8 1.9 1.10 1.11 iii 1.11.06 Warranty (Limited) ......................................................................................... 1-25 1.11.07 Service............................................................................................................. 1-25 SECTION TWO: PRINCIPLES OF OPERATION 2.1 ELECTRICAL OPERATION.......................................................................................... 2-1 2.1.01 Main Control Board .......................................................................................... 2-2 Block Diagram ........................................................................................................... 2-3 Program ROM............................................................................................................ 2-4 RAM .......................................................................................................................... 2-4 LSI.............................................................................................................................. 2-5 Electrically Erasable Programmable Read Only Memory (EEPROM) ..................... 2-5 2.1.02 Initialization ...................................................................................................... 2-6 2.1.03 Parallel Interface Control .................................................................................. 2-7 2.1.04 Print Control...................................................................................................... 2-8 LSI/Printhead Interface .............................................................................................. 2-8 Gap Adjust Control .................................................................................................... 2-9 Print Compensation Control....................................................................................... 2-9 2.1.05 Space and Line Feed (SP/LF) Motor Control ................................................. 2-10 Line Feed Motor Control ......................................................................................... 2-10 Space Motor Control................................................................................................ 2-11 Encoder Disk............................................................................................................ 2-11 2.1.06 Operation Panel............................................................................................... 2-12 2.1.07 Alarm Circuit .................................................................................................. 2-14 Driver Circuit Alarm Processing.............................................................................. 2-14 Low Motor Drive Voltage Alarm ............................................................................ 2-14 Head Drive Time...................................................................................................... 2-15 Print Speed ............................................................................................................... 2-15 Head Overheat Alarm Processing............................................................................ 2-15 2.1.08 Power Supply Circuit ...................................................................................... 2-16 Table of Output Voltages......................................................................................... 2-16 MECHANICAL OPERATION ..................................................................................... 2-17 2.2.01 Printhead Mechanism...................................................................................... 2-17 Printhead Gap Information....................................................................................... 2-18 Interconnect Diagram: Control Board to Printhead ................................................ 2-20 Line Feed Motor Resistance .............................................................................. 2-21 Space Motor Resistance..................................................................................... 2-21 Printhead Operation ................................................................................................. 2-22 Printhead Temperature............................................................................................. 2-22 2.2.02 Spacing Mechanism ........................................................................................ 2-24 Spacing Operation.................................................................................................... 2-24 2.2 iv 2.2.03 Head Gap Mechanism..................................................................................... 2-26 Head Gap Setting Operation .................................................................................... 2-26 2.2.04 Ribbon Drive Mechanism ............................................................................... 2-29 Ribbon Drive Operation........................................................................................... 2-29 2.2.05 Line Feed Mechanism..................................................................................... 2-30 Change Lever (Paper Path Selection Lever) ............................................................ 2-30 Paper Clamp Mechanism ......................................................................................... 2-30 Cut Sheet/Continuous Sheet Switching Mechanism................................................ 2-31 Top Feed (for cut sheet paper) ........................................................................... 2-31 Rear/Bottom Feed (for continuous feed paper).................................................. 2-31 Cut Sheet Paper Feed Operation .............................................................................. 2-32 Continuous Paper Feed (Rear Tractor Mechanism)................................................. 2-32 Continuous Paper Feed (Pull Tractor Mechanism) ................................................. 2-32 Continuous Paper Feed (Bottom Tractor Feed Mechanism) .................................. 2-33 Continuous Paper Feed (Push/Pull Tractor Mechanism)......................................... 2-33 2.2.06 Paper Detection Mechanism .......................................................................... 2-34 Top Feed Paper Detection........................................................................................ 2-34 Rear Feed Detection................................................................................................. 2-34 Bottom Feed Detection ............................................................................................ 2-34 2.2.07 Support Protector Mechanism......................................................................... 2-35 2.2.08 Automatic Paper Load .................................................................................... 2-36 Cut Sheet Paper........................................................................................................ 2-36 Continuous Feed Paper ............................................................................................ 2-37 2.2.09 Paper Park ...................................................................................................... 2-38 Paper Park Operation ............................................................................................... 2-38 SECTION THREE: MAINTENANCE 3.1 OVERVIEW .................................................................................................................... 3-1 3.1.01 General Information.......................................................................................... 3-1 3.1.02 Maintenance Tools............................................................................................ 3-1 3.1.03 Maintenance Precautions .................................................................................. 3-2 DISASSEMBLY/ASSEMBLY PROCEDURES ............................................................ 3-3 General Information................................................................................................... 3-3 3.2.01 Preliminary Items.............................................................................................. 3-4 3.2.02 Printhead Assembly .......................................................................................... 3-6 3.2.03 Ribbon Protector ............................................................................................... 3-8 3.2.04 Gear Case Assembly ....................................................................................... 3-10 3.2.05 Pull-up Roller Assembly................................................................................. 3-12 3.2.06 Upper Cover, Access Cover, and Sheet Guide Assemblies............................ 3-14 3.2.07 Control Board (FJIM) ..................................................................................... 3-16 3.2 v 3.2.08 3.2.09 3.2.10 3.2.11 3.2.12 3.2.13 3.2.14 3.2.15 3.2.16 3.2.17 3.2.18 3.2.19 3.2.20 3.2.21 3.2.22 3.2.23 3.2.24 3.2.25 3.2.26 3.2.27 3.2.28 3.2.29 3.2.30 3.3 Power Supply Assembly ................................................................................. 3-18 Operator Panel PCB (LEOP) .......................................................................... 3-20 PC Connector .................................................................................................. 3-22 Space Motor and Roller Guide Assemblies .................................................... 3-24 Carriage Cable ................................................................................................ 3-26 Space Rack...................................................................................................... 3-28 Roller/Holder Backup Assembly .................................................................... 3-30 Guide Rail and Adjust Cam ............................................................................ 3-32 Left Ground Plate............................................................................................ 3-34 Right Ground Plate ......................................................................................... 3-36 Rear and Cut Sheet Paper Feed Sensor Levers ............................................... 3-38 Platen Assembly.............................................................................................. 3-40 Paper Chute Assembly.................................................................................... 3-42 Line Feed Motor Assembly ............................................................................ 3-44 Reset Spring .................................................................................................... 3-46 Idle Gear and Change Lever ........................................................................... 3-48 Pressure Spring ............................................................................................... 3-50 Carriage Shaft ................................................................................................. 3-52 Leaf Spring...................................................................................................... 3-54 Bottom Paper Sensor Levers........................................................................... 3-56 Front Pressure Roller Assembly ..................................................................... 3-58 Tractor Assembly............................................................................................ 3-60 Main Frame..................................................................................................... 3-62 PRINTER ADJUSTMENTS ......................................................................................... 3-65 3.3.01 General Information........................................................................................ 3-65 3.3.02 Printhead Gap Adjustment.............................................................................. 3-66 General Information................................................................................................. 3-66 Procedure ................................................................................................................. 3-68 Setup Phase ........................................................................................................ 3-68 Printhead Gap Modification Phase .................................................................... 3-68 Parallel Adjustment Phase ................................................................................. 3-68 Verification Phase.............................................................................................. 3-68 3.3.03 Key Combinations .......................................................................................... 3-70 3.3.04 Menu Operation .............................................................................................. 3-71 General Information................................................................................................. 3-71 Menu Mode.............................................................................................................. 3-71 Printing the Menu .................................................................................................... 3-72 Sample Menu ........................................................................................................... 3-73 Reset Menu to Factory Defaults .............................................................................. 3-75 vi Limited Operation.................................................................................................... 3-76 General Information........................................................................................... 3-76 Procedure ........................................................................................................... 3-77 Menu Settings .......................................................................................................... 3-78 Menu Settings .......................................................................................................... 3-78 3.3.05 Top of Form .................................................................................................... 3-82 General Information................................................................................................. 3-82 Setting Top of Form................................................................................................. 3-82 Reset the Top of Form to Factory Default ............................................................... 3-82 3.3.06 Paper Park ....................................................................................................... 3-83 General Information................................................................................................. 3-83 Procedure: Continuous Feed to Single Sheet.......................................................... 3-83 Procedure: Single Sheet to Continuous Feed.......................................................... 3-83 3.3.07 Tear Feature .................................................................................................... 3-84 General Information................................................................................................. 3-84 3.3.08 Forms Tear Off ............................................................................................... 3-85 General Information................................................................................................. 3-85 Vertical Line Spacing Problems .............................................................................. 3-86 Setting ...................................................................................................................... 3-87 Using ........................................................................................................................ 3-87 Checking Top of Form with Form Tear Off Activated............................................ 3-87 3.3.09 Resets .............................................................................................................. 3-88 Reset Menu to Factory Defaults .............................................................................. 3-88 Reset the Top of Form to Factory Default ............................................................... 3-88 3.4 CLEANING ................................................................................................................... 3-89 3.4.01 General Information........................................................................................ 3-89 3.4.02 Cleaning Schedule .......................................................................................... 3-89 3.4.03 Cleaning Tools ................................................................................................ 3-89 3.4.04 Areas to be Cleaned ........................................................................................ 3-89 LUBRICATION ............................................................................................................ 3-90 3.5.01 General Information........................................................................................ 3-90 3.5.02 Lubrication Schedule ...................................................................................... 3-90 3.5.03 Lubrication Types ........................................................................................... 3-90 3.5.04 Lubrication Amounts ...................................................................................... 3-90 3.5.05 Lubrication Table............................................................................................ 3-91 3.5.06 Areas Not Lubricated...................................................................................... 3-91 SHIPPING INSTRUCTIONS........................................................................................ 3-92 3.6.01 Return for Service ........................................................................................... 3-92 3.6.02 All Other Returns ............................................................................................ 3-93 3.5 3.6 vii SECTION FOUR: FAILURE ANALYSIS 4.1 OVERVIEW .................................................................................................................... 4-1 4.1.01 Introduction....................................................................................................... 4-1 4.1.02 Printer Serial Number Identification................................................................. 4-3 4.1.03 Firmware Revision Identification ..................................................................... 4-3 Header ........................................................................................................................ 4-3 REPORTING PROBLEMS ............................................................................................. 4-4 4.2.01 General Information.......................................................................................... 4-4 4.2.02 Problem Lists .................................................................................................... 4-4 4.2.03 Reporting Methods............................................................................................ 4-5 Okilink II.................................................................................................................... 4-5 Course Critique .......................................................................................................... 4-5 Fax Number ............................................................................................................... 4-5 Mailing Address......................................................................................................... 4-5 Information Provided ................................................................................................. 4-5 TROUBLESHOOTING UPDATES................................................................................ 4-6 4.3.01 General Information.......................................................................................... 4-6 4.3.02 Okilink II........................................................................................................... 4-6 4.3.03 Faxable Facts .................................................................................................... 4-6 4.3.04 Technical Service Bulletins .............................................................................. 4-6 TROUBLESHOOTING TIPS.......................................................................................... 4-7 4.4.01 Preliminary Checks ........................................................................................... 4-7 4.4.02 Problem Categories ........................................................................................... 4-8 ALARM Lamp Blinks (Fatal Errors)......................................................................... 4-8 Operational Errors...................................................................................................... 4-8 ALARM Lamp Lights (Paper End/Jam Conditions) ................................................. 4-8 4.4.03 START HERE Flowchart ................................................................................. 4-9 4.4.04 Tips for Preventing Image Problems .............................................................. 4-10 4.4.05 Common Problems.......................................................................................... 4-11 ABNORMAL OUTPUT ................................................................................................ 4-14 4.5.01 Output Samples ............................................................................................... 4-14 Light Print on the Entire Page............................................................................ 4-15 Uneven Print Density ......................................................................................... 4-15 Smeared Print..................................................................................................... 4-15 Inconsistent Line Feed ....................................................................................... 4-15 Drifting Margin .................................................................................................. 4-15 Left Margin Drifting Problem............................................................................ 4-17 4.2 4.3 4.4 4.5 viii 4.6 FAULT ALARMS ......................................................................................................... 4-18 4.6.01 General Information........................................................................................ 4-18 4.6.02 ALARM/LED Display Troubleshooting Table Index .................................... 4-19 4.6.03 ALARM/LED Display Troubleshooting Tables............................................. 4-20 REPAIR ANALYSIS PROCEDURES (RAPs)............................................................. 4-22 4.7.01 Using the RAPs............................................................................................... 4-22 4.7.02 RAP Index....................................................................................................... 4-23 RAP 01 No Power Supplied to Printer..................................................................... 4-24 RAP 02 No Spacing Operation ................................................................................ 4-26 RAP 03 Printhead Homing Error ............................................................................. 4-28 RAP 04 Paper Jam During Paper Loading .............................................................. 4-30 RAP 05 Printhead Pins Not Firing........................................................................... 4-31 RAP 06 Poor Print Quality....................................................................................... 4-32 RAP 07 Ribbon Feed Problem................................................................................. 4-33 RAP 08 Line Feed Problem ..................................................................................... 4-34 RAP 09 Operation Panel Malfunction ..................................................................... 4-37 RAP 10 Parallel Interface Problem.......................................................................... 4-38 RAP 11 Serial Interface Problem............................................................................. 4-40 PRINTER TESTS .......................................................................................................... 4-43 4.8.01 General Information........................................................................................ 4-43 4.8.02 Rolling ASCII Test ......................................................................................... 4-44 General Information................................................................................................. 4-44 Procedure ................................................................................................................. 4-44 Sample...................................................................................................................... 4-45 4.8.03 Font Test ......................................................................................................... 4-46 General Information................................................................................................. 4-46 Procedure ................................................................................................................. 4-46 Sample...................................................................................................................... 4-47 4.8.04 Serial Interface Loopback Test ....................................................................... 4-48 Loopback Connector Configuration ........................................................................ 4-49 Serial Cable Information.......................................................................................... 4-50 Serial Interface Signal Requirements....................................................................... 4-50 Commonly Used Serial Cable Configurations......................................................... 4-51 IBM 25-Pin Cable Configuration....................................................................... 4-51 IBM 9-Pin Cable Configuration......................................................................... 4-51 4.7 4.8 ix 4.8.05 Hexadecimal Dump Mode .............................................................................. 4-52 General Information................................................................................................. 4-52 Example ................................................................................................................... 4-52 Procedure ................................................................................................................. 4-52 Sample...................................................................................................................... 4-53 4.9 RESISTANCE CHECKS............................................................................................... 4-54 4.9.01 General Description ........................................................................................ 4-54 Layout Diagram ....................................................................................................... 4-55 4.9.02 Printhead ......................................................................................................... 4-56 Interconnect Diagram: Control Board to Printhead ................................................ 4-56 4.9.03 Line Feed Motor Resistance ........................................................................... 4-57 4.9.04 Space Motor Resistance.................................................................................. 4-57 APPENDIX A: BOARD DIAGRAMS A.1 A.2 OVERVIEW ................................................................................................................... A-1 A.1.01 General Information......................................................................................... A-1 INDEX TO CHARTS ..................................................................................................... A-2 A.2.01 Main Controller Board (FJIM)......................................................................... A-4 A.2.02 Operator Panel Board (LEOP) ......................................................................... A-6 A.2.03 Power Supply Assembly .................................................................................. A-8 A.2.04 Space Motor Board ........................................................................................ A-10 A.2.05 RS232-C Serial Interface Board - Option (LXHI)........................................ A-12 APPENDIX B: ILLUSTRATED PARTS LISTING B.1 OVERVIEW ....................................................................................................................B-1 B.1.01 General Information..........................................................................................B-1 Format ........................................................................................................................B-2 Current Part Numbers ................................................................................................B-3 B.1.02 Definition of Terms...........................................................................................B-4 Assemblies .................................................................................................................B-4 Blank ..........................................................................................................................B-4 Consumable................................................................................................................B-4 Document...................................................................................................................B-4 Drivers........................................................................................................................B-4 Firmware ....................................................................................................................B-4 Option ........................................................................................................................B-4 Option RSPL..............................................................................................................B-4 RSPL ..........................................................................................................................B-4 Technical Service Bulletins .......................................................................................B-5 x 520..............................................................................................................................B-5 521..............................................................................................................................B-5 Both............................................................................................................................B-5 B.1.03 Parts Ordering Information ...............................................................................B-6 Service Center Reference Guide ................................................................................B-6 Placing a Parts Order .................................................................................................B-7 B.2 CHARTS..........................................................................................................................B-8 B.2.01 Printer..............................................................................................................B-10 B.2.02 Upper Cover Assembly...................................................................................B-12 B.2.03 Printer General Assembly ...............................................................................B-14 B.2.04 Printer Unit......................................................................................................B-16 B.2.05 Printer Unit......................................................................................................B-18 B.2.06 Printer Unit......................................................................................................B-20 B.2.07 Carriage Assembly..........................................................................................B-22 B.2.08 Options............................................................................................................B-24 B.2.09 Option Parts ....................................................................................................B-26 B.2.10 Consumables ...................................................................................................B-28 B.2.11 Packing Materials............................................................................................B-30 B.2.12 Documentation................................................................................................B-32 B.2.13 Service Training Kit Revision List .................................................................B-34 xi This page was intentionally left blank. xii COURSE ADMINISTRATION OVERVIEW Okidata developed this course in order to provide the information necessary to install and maintain the Microline 520 and Microline 521 printers. Upon successful completion of this training course, you will be able to do the following. Install and operate the product Locate the major assemblies of the product Identify fault indications Perform corrective and preventive maintenance The Service Handbook is the primary reference manual for this course. You cannot, however, successfully complete this course by referring only to this manual. Take the time to familiarize yourself with all of the documentation in the training kit. This additional information will greatly simplify working with the product. Okidata's Technical Training Program is designed to build a knowledgeable and efficient service and support group for Okidata products. One step in becoming an Authorized Okidata Service Center is obtaining a training kit for the appropriate product. This acquisition allows the Dealership to have reference materials available during service jobs. Having, and using, these reference materials will minimize the time and money spent on repairs. Technicians complete Certification Tests as part of Okidata's Authorization process. Testing familiarizes the technician with the product and reference materials. This training course provides assembly level repair information to the field technician. No attempt is made to provide basic training in being a technician. This kit strives to train a technician to service the product. Okidata views service technicians as representatives of Okidata. Through this course, Okidata seeks to provide the means and the motivation that will make good service a reality. Remember Component level servicing is provided only at Okidata Service Repair Depots! Microline 520/521 Service Handbook P/N 59257803 i-1 Course Administration RECOMMENDATIONS Prerequisites Before beginning this course, you should know the following concepts. Have an understanding of basic electronics Be familiar with electrostatic principles Be familiar with dot matrix technology and protocol Be familiar with the proper procedures for handling circuit boards, Read Only Memory (ROM), and Random Access Memory (RAM) Be able to use basic tools Be able to use a digital multimeter (DMM) Equipment The following equipment is recommended for the successful completion of this training course. Microline 520 or Microline 521 (optional) Tools (optional - refer to Module Three of the Service Handbook) Personal Computer (for Okilink II connection) Modem (for Okilink II connection) Communications Software (for Okilink II connection) Telephone (for Faxable Facts connection) Facsimile Machine (for Faxable Facts connection) Video Cassette Player (for viewing videotape) Video Monitor (for viewing videotape) Documentation You should have access to the following documentation while completing this course. Okidata Service Center Reference Guide Service Handbook Printer Handbook Service Videotape Course Administration i-2 Microline 520/521 Service Handbook P/N 59257803 INFORMATION UPDATES 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. Technical updates are made available to authorized Service Centers through the Technical Service Bulletins (TSBs / Okidata's Monthly Technical Mail). The TSBs are distributed via Okidata's Bulletin Board, Okilink II. Additions and corrections to the training materials are available in the Training Section of Okilink II. Please sign on and check this section before beginning this course. For information on using Okilink II, please refer to the Service Center Reference Guide. NOTICES Pay attention to all notices that appear throughout this training course. They are for your safety! Here are the definitions of the notices. NOTE: This notice refers to supplemental information. CAUTION: Deviation from the listed procedures may result in damage to the product. WARNING: Deviation from the listed procedures may result in personal injury. Microline 520/521 Service Handbook P/N 59257803 i-3 Course Administration WHERE TO SEND TESTING MATERIALS Refer to the Okidata Service Center Reference Guide for where to send the test materials. The Okidata Service Center Reference Guide is sent to your dealership along with the Okidata Service Contract materials. It is available from Okidata Dealer Service. It is also available through Okilink II. Course Administration i-4 Microline 520/521 Service Handbook P/N 59257803 MISSING ITEMS OR MISSING PAGES Missing Items When you receive the training kit, you MUST verify that the kit contains the items listed on the Read Me First sheet. If any items are missing, please contact Okidata Logistics at the appropriate number listed below. Facsimile Voice 1-609-424-7423 1-800-727-8654 You must provide the following information. · · · · Okidata Authorization Number (Dealer Number) Okidata Customer Number Order Acknowledgment Number (on the invoice) Part Number of kit Missing Pages If you find that pages are missing from any item in this kit, please contact Okidata Technical Training. Please FAX your request or use Okilink II. Fax Number: (609) 235-2600, ext. 7034 Okilink Login Name: Technical Training You must provide the following information. · · · · Okidata Authorization Number (Dealer Number) Part Number of document with missing pages Name of document with missing pages Page numbers of missing pages If it is the Service Handbook, be sure to specify the section (i, 1, 2, 3, 4, a, or b). · Your facsimile number (with area code) Microline 520/521 Service Handbook P/N 59257803 i-5 Course Administration COURSE PATH This Course Administration directs you through the training package. Each section covers a different part of the training. Tasks within each section direct you to the portions of the training materials that cover the subject you are studying. When you have completed one section, move on to the next. You must achieve a score of 80% or greater on your Certification Test to successfully complete this course. You must return your completed Certification Test Answer Sheet and Course Critique to Okidata within 30 days after the kit is received by your Dealership. If multiple technicians are training at your Dealership, only one technician must complete the testing during the 30 days. DO NOT STAPLE THE ANSWER SHEET TO THE COURSE CRITIQUE! Be sure to make a copy of the Answer Sheet for your records. Your Answer Sheet will be corrected within two days after it is received by Okidata. If you achieve a score of 80% or higher, you will receive a Certificate of Training. The Dealership you work for will become an Authorized Service Center for the products covered in this training package. Service Authorization is approved once Okidata processes the Answer Sheet. The Certificate of Training will be mailed to you after the Answer Sheet is corrected. You and your Dealership are responsible for returning the Answer Sheet and Course Critique within 30 days after receiving the training kit. Okidata strongly urges you to keep track of the date you return your Answer Sheet and Course Critique. Certification and Authorization are processed within two days after Okidata receives the testing materials. A certificate for successful completion of the training program will be sent to you within 21 days. If authorization is not updated within two days or a certificate received within 21 days, contact Okidata Dealer Service. Proceed through each section and perform the assigned tasks. Learn from the Course and Good Luck! Course Administration i-6 Microline 520/521 Service Handbook P/N 59257803 SERVICE TRAINING Requirements You will need the following items. Service Center Reference Guide Service Handbook User's Documentation Service Videotape Video Cassette Player and Monitor Service Training is divided into the following six sections. General Description Installation Principles of Operation Failure Analysis Appendices Maintenance Disassembly/Assembly Adjustments and Service Checks Cleaning Lubrication Shipping Instructions Microline 520/521 Service Handbook P/N 59257803 i-7 Course Administration General Description This section describes the features and specifications of the printers. Assigned Tasks Read Section 1 of the Service Handbook. Read Appendix A in the Printer Handbook. Installation In this section, you will install the unit. You will also perform various tests. Assigned Tasks Review the Printer Handbook Read the Introduction; Chapters 1, 2, 3, 4, and 5; and Appendices B, C, D, E, and F in the Printer Handbook. If a product is available, perform the tests listed below. Refer to Section 4 of the Service Handbook. Rolling ASCII Font Test Principles of Operation This section describes the function of the major assemblies from an electrical and mechanical perspective. Assigned Tasks Read Section 2 of the Service Handbook. Course Administration i-8 Microline 520/521 Service Handbook P/N 59257803 Failure Analysis This section covers the methods used to identify and correct problems with the unit. Assigned Tasks Read Section 4 of the Service Handbook. Read Chapter 6 of the Printer Handbook. Study the Board Diagrams in Appendix A of the Service Handbook. Check Okilink II for additional troubleshooting information. Refer to the Service Center Reference Guide for information on accessing Okilink II. Appendices A and B Appendices A and B contain charts, illustrations, and an illustrated parts list to support you in servicing the product. Appendix A Appendix A contains information about the printed circuit boards (PCBs). This appendix includes reference charts which present data regarding function, firmware, fuses, jumpers, sensors, switches, and test points. An illustration of each board is also included. Appendix B Appendix B is an illustrated parts listing of the product. This listing is cross-referenced to Section 3 of the Service Handbook. Assigned Tasks Look through Appendix A and Appendix B in the Service Handbook. Microline 520/521 Service Handbook P/N 59257803 i-9 Course Administration Maintenance Disassembly / Assembly Assigned Tasks Read Section 3.2 of the Service Handbook. View the videotape. CAUTION: Okidata does not recommend performing the disassembly / assembly procedures on a product which is operating normally. Therefore, you are not required to perform the disassembly / assembly procedures to complete this training. Adjustments and Service Checks This section explains the adjustments performed after parts replacement. Hardware replacement may require adjustments to firmware settings. This section also explains viewing and resetting counters. Assigned Tasks Read Section 3.3 of the Service Handbook. Perform the procedures listed in Section 3.3 of the Service Handbook. Cleaning Assigned Tasks Read Section 3.4 of the Service Handbook. Lubrication Assigned Tasks Read Section 3.5 of the Service Handbook. Shipping Instructions Assigned Tasks Read Section 3.6 of the Service Handbook. Course Administration i - 10 Microline 520/521 Service Handbook P/N 59257803 SERVICE AUTHORIZATION General Information Read through the instructions for completing the testing process before you begin. This section contains the Answer Sheet, Certification Test, and Course Critique for this service training package. These are the only copies of these items you will receive. DO NOT WRITE ON THESE ITEMS! PHOTOCOPY EACH ITEM! Use the photocopies to complete the testing process. Photocopy the Certification Test, Answer Sheet, and Course Critique as required for each technician being trained. The information provided on the Answer Sheet and Course Critique is used to update your Dealership's Okidata Service Warranty Profile and to process your Certificate of Training. The critique information is used to respond to your questions regarding this training package. MAKE YOUR RESPONSES COMPLETE AND LEGIBLE! Feel free to reference the training material as you answer the test questions. Every attempt has been made to test your knowledge of the product and your ability to use the reference materials in this kit. No attempt has been made to write "trick questions". If you have a question about a specific test question or answer, please bring it to the attention of Okidata Technical Training. Refer to the Service Center Reference Guide for information on contacting Okidata Technical Training. In order to improve the quality of future training courses, Okidata welcomes your evaluation of this training program. Please complete the course critique for this training course. Before returning your completed testing materials, photocopy your completed Answer Sheet for your records. DO NOT ATTACH ANYTHING TO THE ANSWER SHEET! Microline 520/521 Service Handbook P/N 59257803 i - 11 Course Administration Certification Test Requirements You must achieve a score of 80% or greater on your Certification Test to successfully complete this course. You will need the following items. Service Handbook User's Documentation #2 Lead Pencil Assigned Tasks Read through all instructions BEFORE completing the testing process. Photocopy the Certification Test and Answer Sheet provided in this kit. Use the photocopies to complete the testing process. Complete the top section of the Answer Sheet. Make your responses legible. Answer the Certification Test Questions by filling in the appropriate block on the Answer Sheet. Use a Number 2 pencil and completely fill in the selected block. DO NOT ATTACH ANYTHING TO THE ANSWER SHEET! Make a copy of the completed Answer Sheet for your records. Course Critique Requirements You will need the following items. Your photocopy of the Course Critique Assigned Tasks Complete the Course Critique. Return the Answer Sheet and Course Critique to Okidata Dealer Service. DO NOT ATTACH ANYTHING TO THE ANSWER SHEET! DATE ITEMS RETURNED TO OKIDATA: __________________________ Course Administration i - 12 Microline 520/521 Service Handbook P/N 59257803 Answer Sheet: Microline 520/521 Dealer Code: Technician's Name: Company: Company's Address: Today's Date: Section 1 City: State/Province: Zip/Postal Code: Country: Phone #: Fax #: If your Dealership uses Okilink II, please provide your Dealership's Login Name. First: A 1. 2. B C D 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. Last: A B C D Section 2 3. 4. 5. 6. 7. 8. 9. 10. Microline 520/521 Service Handbook P/N 59257803 i - 13 Course Administration Course Critique: Microline 520/521 Dealer Code: Technician's Name: Company: Company's Address: Today's Date: City: State/Province: Zip/Postal Code: Country: Phone #: 1. Fax #: Have you completed other Okidata Self-Study Service Training packages? Yes No 2. Please rate this course. Excellent Above Average Average Below Average Poor 3. Does your Dealership use Okilink II? Yes No If yes, please provide your Dealership's Login Name. First Name: Last Name: Course Administration i - 14 Microline 520/521 Service Handbook P/N 59257803 4. Comments Microline 520/521 Service Handbook P/N 59257803 i - 15 Course Administration Certification Test: Microline 520/521 1. After installing the space motor, Okidata recommends that you check the printhead gap. A. B. True False Correct Answer: A Pages 3-2 and 3-26, Service Handbook, Rev 01 and 02 Pages 3-2, 3-24, and 3-66, Service Handbook, Rev 03 2. Refer to RAP 01. You have pressed the AC power switch to ON, but the unit does not power ON. The next step is to A. B. C. D. replace the fuse. check if the AC cable is connected properly. replace the space motor assembly. remove the printhead. Correct Answer: B Page 4-10, Service Handbook, Rev 01 and 02 Page 4-24, Service Handbook, Rev 03 3. The + 40 vdc needed for the printhead and space motor drive can be verified at __________ on the main control (FJIM) board. A. B. C. D. CN1 Pins 8 and 9 CN3 Pins 1 and 2 CN7 Pins 29 and 31 CN6 Pins 1 and 2 Correct Answer: C Page A-4, Service Handbook, Rev 01 and 02 Page A-4, Service Handbook, Rev 03 Course Administration i - 16 Microline 520/521 Service Handbook P/N 59257803 4. According to Appendix A of the Service Handbook, one function of the main control board is to regulate the AC voltages from the power supply (transformer). A. B. True False Correct Answer: A Page A-4, Service Handbook, Rev 01 and 02 Page A-4, Service Handbook, Rev 03 5. You are using RAP 11 to troubleshoot a printer. The unit cannot receive serial communication from the host. You have verified that the cable has the proper configuration of pins. No ALARM LEDs are blinking. Your next step should be to A. B. C. D. replace the transformer. replace the RS 232-C serial board. check your serial interface parameters. replace the main control board (FJIM). Correct Answer: C Page 4-26, Service Handbook, Rev 01 and 02 Page 4-40, Service Handbook, Rev 03 Microline 520/521 Service Handbook P/N 59257803 i - 17 Course Administration 6. The printer is processing a head overheat alarm. When the printhead temperature exceeds 110 degrees Celsius, the printer switches to unidirectional print. When the printhead temperature exceeds 118 degrees Celsius, the printer will A. B. C. D. need a new space motor. continue unidirectional print. alternate between unidirectional print and bidirectional print. stop printing. Correct Answer: D Pages 2-21, 2-28, and 4-31, Service Handbook, Rev 01 and 02 Pages 1-11, 2-15, 2-32, and 4-21, Service Handbook, Rev 03 7. Before you begin troubleshooting an ALARM / LED display, you should always A. B. C. D. replace the power supply. check that all of the connectors of the printer are making good contact. replace the main control board. replace the operator panel. Correct Answer: B Page 4-30, Service Handbook, Rev 01 and 02 Page 4-20, Service Handbook, Rev 03 Course Administration i - 18 Microline 520/521 Service Handbook P/N 59257803 8. According to the Printer Handbook or Section Three of this Service Handbook, which of the following settings is NOT a default menu setting of the serial interface configuration? A. B. C. D. Parity - Even Serial Data - 8 bits Protocol - Ready/Busy Baud Rate - 9600 bps Correct Answer: A Page 90, Printer Manual User's Documentation, Rev 01 and 02 Page 3-81, Service Handbook, Rev 03 9. The ALARM lamp is flashing. The PROP and 10 cpi lamps are lit. Which alarm is the printer experiencing? A. B. C. D. Printhead Data Transfer Alarm Printhead Type Alarm Paper End Alarm Space Motor Alarm Correct Answer: B Page 4-29 and 4-30, Service Handbook, Rev 01 and 02 Pages 4-19 and 4-20, Service Handbook, Rev 03 Microline 520/521 Service Handbook P/N 59257803 i - 19 Course Administration 10. You install a new control board in the printer. What are the indications of an incorrectly positioned cut sheet / continuous sensor lever? A. B. C. D. The unit will not power-ON. All lamps on the operator panel light. The ALARM lamp lights and F1 on the control board blows. The ALARM lamp lights and the unit will NOT automatically load paper. Correct Answer: D Pages i-7 and i-8, Service Handbook, Rev 01 and 02 OLD QUESTION Page 3-16, Service Handbook, Rev 03 NEW QUESTION 11. What is the recommended ambient temperature and relative humidity (RH) for the printer while operating? A. B. C. D. 41°F to 104°F, 20% to 80% (RH) 41°F to 104°F, 10% to 70% (RH) 41°F to 104°F, 20% to 50% (RH) 41°F to 104°F, 20% to 90% (RH) Correct Answer: A Page 1-2, Service Handbook, Rev 01 and 02 Page 1-4, Service Handbook, Rev 03 12. The Microline 520 and Microline 521 printers allow you to print up to eight different bar codes. A. B. True False Correct Answer: A Pages 84, Printer Manual and 1-8, Service Handbook, Rev 01 and 02 Page 1-7 and 1-8, Service Handbook, Rev 03 Course Administration i - 20 Microline 520/521 Service Handbook P/N 59257803 13. The Microline 520 and Microline 521 printers come with _____________ Kbyte of resident RAM. A. B. C. D. 32 64 128 256 Correct Answer: C Page 1-4, Service Handbook, Rev 01 and 02 Page 1-20, Service Handbook, Rev 03 14. Refer to RAP 02. The carriage is jammed. The ribbon is not jammed. What do you do next? A. B. C. Install a new space motor. Power OFF the printer, then power ON. Remove the space motor assembly and inspect the teeth on the space rack and space motor gear. Replace fuse F1 on the main controller board. D. Correct Answer: C Page 4-12, Service Handbook, Rev 01 and 02 Page 4-26, Service Handbook, Rev 03 15. You must replace the line feed motor. The disassembly procedure also tells you to remove the line feed idle gear. A. B. True False Correct Answer: B Page 3-54, Service Handbook, Rev 01 and 02 Page 3-46, Service Handbook, Rev 03 Microline 520/521 Service Handbook P/N 59257803 i - 21 Course Administration 16. Three items factor into printhead gap information. 1. Printhead Gap Adjustment (performed by a service technician) 2. Printhead Gap Adjust (set in the printer menu, under the Set-up Group) 3. Gap Control (set in the printer menu, under each [Paper Feed] Group) A. B. True False Correct Answer: A Page C-1, Service Handbook, Rev 01 and 02 OLD QUESTION Pages 1-12 and 2-18, Service Handbook, Rev 03 NEW QUESTION 17. Which of the following areas of the printer should NOT be lubricated? 1. 2. 3. 4. Tractor pins Pressure roller (Rubber Face) Platen assembly (Rubber Face) Teeth of gears in the gear case assembly A. B. C. D. 1 1 and 2 1, 2, and 3 1, 2, 3, and 4 Correct Answer: D Page 3-88 and 3-89, Service Handbook, Rev 01 and 02 Page 3-91, Service Handbook, Rev 03 Course Administration i - 22 Microline 520/521 Service Handbook P/N 59257803 18. You are performing the printhead gap adjustment. The printhead gap is changed by turning the adjusting screw, located on the space motor assembly. Turning the adjusting screw counter-clockwise will increase the gap. Turning it clockwise will decrease the gap. A. B. True False Correct Answer: B Page 3-68, Service Handbook, Rev 01 and 02 Page 3-68, Service Handbook, Rev 03 19. The ALARM lamp is flashing. The 15 cpi LED is lit. Which of the following should be replaced first? A. B. C. D. Printhead Line feed motor Space motor Main control board and / or ROM Correct Answer: D Page 4-30, Service Handbook, Rev 01 and 02 Page 4-20, Service Handbook, Rev 03 Microline 520/521 Service Handbook P/N 59257803 i - 23 Course Administration 20. Before resetting a printer menu to factory settings, Okidata recommends that you A. B. C. run a self test. perform the hex dump test. power OFF the printer, then press and hold the LINE FEED while powering ON the printer. print the menu. D. Correct Answer: D Pages 47, User's Documentation and 3-81, Service Handbook, Rev 01 and 02 Page 3-75, Service Handbook, Rev 03 Course Administration i - 24 Microline 520/521 Service Handbook P/N 59257803 SECTION ONE SPECIFICATIONS 1.1 1.1.01 OVERVIEW General Information The Microline 520 and Microline 521 are letter quality, nine-pin, dot-matrix printers which utilize OKISMART paper handling. Patented Okidata technology does away with the manual head gap adjustment. The printer actually "reads and learns" the print medium being used, then automatically adjusts the head gap to the optimum distance. This autogapping process leads to longer printhead life. Options include the Bottom Feed Push Tractor, Cut-Sheet Feeder, Pull Tractor and Serial Interface Board. The Microline 520 is an 80 column printer. The Microline 521 is a 132 column printer. Okidata's one year limited warranty covers the parts, labor and printhead on both printers. The following items are available for the printer. OKISMART Typer - software which provides the flexibility for the Microline 590/521 to function like a typewriter on checks, labels and envelopes. OKISMART Panel - a utility program that lets you control selected printer functions from your personal computer. Scalable Fonts - 14 scalable fonts, available on diskette. NOTE: The OkiSmart software includes three programs. 1. 2. 3. OkiSmart Control OkiSmart Panel Emulator OkiSmart Setup Refer to the Printer Handbook for more information. Microline 520/521 Service Handbook P/N 59257803 1-1 Specifications 1.2 1.2.01 NOTE: PHYSICAL SPECIFICATIONS Dimensions Dimensions INCLUDE the platen knob, acoustic cover, and paper separator. Microline 520 Width: 16.9 inches (43 centimeters) Depth: 14.9 inches (37.8 centimeters) Height: 6.5 inches (16.5 centimeters) Microline 521 Width: 23 inches (58.4 centimeters) Depth: 14.9 inches (37.8 centimeters) Height: 6.5 inches (16.5 centimeters) 1.2.02 Printer Weight Microline 520 17.6 pounds (8.0 kilograms) Microline 521 23.1 pounds (10.5 kilograms) Specifications 1-2 Microline 520/521 Service Handbook P/N 59257803 1.3 1.3.01 POWER REQUIREMENTS Input Power 120 VAC: +5.5 / -15% 230/240 VAC: +10 / -14% 1.3.02 Power Consumption Operating: Idle: Local Test: 110 VA 40 VA 70 VA 1.3.03 Power Frequency 120 VAC: 60 Hz +/- 2% 230/240 VAC: 50/60 Hz +/- 2% Microline 520/521 Service Handbook P/N 59257803 1-3 Specifications 1.4 1.4.01 ENVIRONMENTAL CONDITIONS Acoustic Rating Near Letter Quality Mode Microline 520 Microline 521 Utility Mode Microline 520 Microline 521 Quiet Mode Microline 520 Microline 521 52.5 dBA 52.3 dBA 57.2 dBA 56.9 dBA 54.9 dBA 54.4 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 degrees Fahrenheit (5 to 40 degrees Celsius) Operating humidity: 20% to 80% RH While in storage: 14 to 122 degrees Fahrenheit ( - 10 to 50 degrees Celsius) Storage humidity: 5% to 95% RH Specifications 1-4 Microline 520/521 Service Handbook P/N 59257803 1.5 1.5.01 AGENCY APPROVALS Listings UL No: CSA No: FCC: IEC: VDE: BS: UL Standard No. 1950 D3 CSA Standard 22.2-950 D3 FCC Certified per Part 15, Subject J, Class B IEC 950 VDE 0805 VDE 0875 Class B BS 7002 Microline 520/521 Service Handbook P/N 59257803 1-5 Specifications 1.6 1.6.01 OPERATIONAL SPECIFICATIONS Character Matrix Sizes Table of Print Speed and Character Matrix Mode Speed Matrix (H x V) Near Letter Quality 80 (12 cpi) 17 x 13 Utility 320 (12 cpi) 9x7 High Speed Draft 427 (12 cpi) 7x7 1.6.02 Characters Per Line Microline 520 Characters Per Line 80 96 120 137 160 Characters Per Inch 10 12 15 17.1 20 Microline 521 Characters Per Line 136 163 204 233 272 Characters Per Inch 10 12 15 17.1 20 1.6.03 Character Pitches 5, 6, 8.5, 10, 12, 15, 17.1, 20 Specifications 1-6 Microline 520/521 Service Handbook P/N 59257803 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, 865 and 437 Line Graphics Bar Code Code 39 UPC A UPC E EAN 8 EAN 13 Interleaved 2 of 5 Code 128 (A, B, C) Postnet 1.6.05 NOTE: Emulations The emulations are co-resident Epson FX IBM Proprinter Microline Standard Microline 520/521 Service Handbook P/N 59257803 1-7 Specifications