Oki Microline 520 Service Handbook
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Oki Microline 520 Service Handbook

Oki Microline 520 Service Handbook

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Summary of Contents for Oki Microline 520

  • Page 1 Thank You for purchasing this Factory Service Manual on EBAY from PCTECHINFO! Click Here for more Factory Service Manuals for other Computer and Printer / Copier Manufacturers from PCTECHINFO!
  • Page 2 Microline 520/521 Service Handbook P/N 59257803...
  • Page 3 Microline 520/521 Service Handbook...
  • Page 4 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.

  • Page 5: Table Of Contents

    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 OVERVIEW ........................1-1 1.1.01...
  • Page 6 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 ......................
  • Page 7 1.6.20 Print Speed ...................... 1-14 Table of Print Speed and Character Matrix ............. 1-14 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 ...................
  • Page 8 1.11.06 Warranty (Limited) ..................1-25 1.11.07 Service......................1-25 SECTION TWO: PRINCIPLES OF OPERATION 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 ......................
  • Page 9 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) ................
  • Page 10 3.2.08 Power Supply Assembly ................. 3-18 3.2.09 Operator Panel PCB (LEOP) ................3-20 3.2.10 PC Connector ....................3-22 3.2.11 Space Motor and Roller Guide Assemblies ............ 3-24 3.2.12 Carriage Cable ....................3-26 3.2.13 Space Rack...................... 3-28 3.2.14 Roller/Holder Backup Assembly ..............3-30 3.2.15 Guide Rail and Adjust Cam ................
  • Page 11 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 .......................
  • Page 12 SECTION FOUR: FAILURE ANALYSIS 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........................
  • Page 13 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 ................
  • Page 14 4.8.05 Hexadecimal Dump Mode ................4-52 General Information....................4-52 Example ........................4-52 Procedure ......................... 4-52 Sample........................4-53 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 ................
  • Page 15 520..........................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 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...
  • Page 16 This page was intentionally left blank.

  • Page 17: Course Administration

    COURSE ADMINISTRATION...

  • Page 19: Overview

    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.

  • Page 20: Recommendations

    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)

  • Page 21: Information Updates

    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.

  • Page 22: Where To Send Testing Materials

    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.
  • Page 23 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.

  • Page 24: Course Path

    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.

  • Page 25: Service Training

    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 i - 7 Course Administration P/N 59257803...
  • Page 26 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...
  • Page 27 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 i - 9 Course Administration P/N 59257803...
  • Page 28 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.

  • Page 29: Service Authorization

    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.
  • Page 30 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...

  • Page 31: Answer Sheet: Microline 520/521

    Answer Sheet: Microline 520/521 Dealer Code: Today’s Date: Technician’s Name: Company: Company’s Address: City: State/Province: Zip/Postal Code: Country: Phone #: Fax #: If your Dealership uses Okilink II, please provide your Dealership’s Login Name. First: Last: Microline 520/521 Service Handbook...

  • Page 32: Course Critique: Microline 520/521

    Company: Company’s Address: City: State/Province: Zip/Postal Code: Country: Phone #: Fax #: Have you completed other Okidata Self-Study Service Training packages? Please rate this course. Excellent Below Average Above Average Poor Average Does your Dealership use Okilink II? If yes, please provide your Dealership’s Login Name.
  • Page 33 Comments Microline 520/521 Service Handbook i - 15 Course Administration P/N 59257803...

  • Page 34: Certification Test: Microline 520/521

    Certification Test: Microline 520/521 After installing the space motor, Okidata recommends that you check the printhead gap. 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 Refer to RAP 01.
  • Page 35 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 i - 17 Course Administration P/N 59257803...
  • Page 36 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...
  • Page 37 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 i - 19 Course Administration P/N 59257803...
  • Page 38 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 The Microline 520 and Microline 521 printers allow you to print up to eight different bar codes. True False...
  • Page 39 The Microline 520 and Microline 521 printers come with _____________ Kbyte of resident RAM. Correct Answer: C Page 1-4, Service Handbook, Rev 01 and 02 Page 1-20, Service Handbook, Rev 03 Refer to RAP 02. The carriage is jammed. The ribbon is not jammed. What do you do next? Install a new space motor.
  • Page 40 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...
  • Page 41 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 i - 23 Course Administration P/N 59257803...
  • Page 42 Before resetting a printer menu to factory settings, Okidata recommends that you 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.

  • Page 43: Section One: Specifications

    SECTION ONE SPECIFICATIONS...

  • Page 45: Overview

    OVERVIEW 1.1.01 General Information The Microline 520 and Microline 521 are letter quality, nine-pin, dot-matrix printers which utilize OKI paper handling. Patented Okidata technology does away with the manual SMART head gap adjustment. The printer actually "reads and learns" the print medium being used, then automatically adjusts the head gap to the optimum distance.

  • Page 46: Physical Specifications

    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...

  • Page 47: Power Requirements

    230/240 VAC: +10 / -14% 1.3.02 Power Consumption Operating: 110 VA Idle: 40 VA Local Test: 70 VA 1.3.03 Power Frequency 120 VAC: 60 Hz +/- 2% 230/240 VAC: 50/60 Hz +/- 2% Microline 520/521 Service Handbook 1 - 3 Specifications P/N 59257803...

  • Page 48: Environmental Conditions

    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...

  • Page 49: Agency Approvals

    UL Standard No. 1950 D3 CSA No: CSA Standard 22.2-950 D3 FCC: FCC Certified per Part 15, Subject J, Class B IEC: IEC 950 VDE: VDE 0805 VDE 0875 Class B BS 7002 Microline 520/521 Service Handbook 1 - 5 Specifications P/N 59257803...

  • Page 50: Operational Specifications

    Characters Per Line Microline 520 Characters Per Line Characters Per Inch 17.1 Microline 521 Characters Per Line Characters Per Inch 17.1 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...

  • Page 51: Character Sets

    UPC A UPC E EAN 8 EAN 13 Interleaved 2 of 5 Code 128 (A, B, C) Postnet 1.6.05 Emulations NOTE: The emulations are co-resident Epson FX IBM Proprinter Microline Standard Microline 520/521 Service Handbook 1 - 7 Specifications P/N 59257803...

  • Page 52: Fonts

    Print Quality Selection Top of Form Tear Quiet Reset 1.6.08 Graphics Resolution Graphics Resolution: 288 (horizontal) x 144 (vertical) dots per inch (DPI) maximum 1.6.09 Interface Standard Centronics Parallel Optional RS232C Serial Specifications 1 - 8 Microline 520/521 Service Handbook P/N 59257803...

  • Page 53: Line Feed Increments

    Paper Park Prints the entire menu. Line Feed / Reverse Selects Group Function FORM FEED / Load Selects Item Tear Selects Item Value SEL / Menu Exits Menu Mode, Enters Select Microline 520/521 Service Handbook 1 - 9 Specifications P/N 59257803...

  • Page 54: Paper Feed Methods

    0.5 inches (12.7 mm) Top Feed: 0.5 inches (12.7 mm) 1.6.17 Paper Tear Capabilities Forms Tear-0ff (sharp edge on access cover) Metal Tear Bar (with optional bottom feed tractor unit) Specifications 1 - 10 Microline 520/521 Service Handbook P/N 59257803...

  • Page 55: Print Method

    If the temperature exceeds 118 degrees Celsius, printing stops. Printing will resume when the printhead temperature drops below 118 degrees Celsius. NOTE: Refer to Section Two for more information on printhead operation. Microline 520/521 Service Handbook 1 - 11 Specifications P/N 59257803...

  • Page 56: Printhead Gap Information

    Gap Control determines how the printhead gap is set. The settings are listed below. Auto Gap, Semi Auto Gap, 1, 2, 3, 4, 5, 6, 7, 8, 9 An explanation of each setting follows. Specifications 1 - 12 Microline 520/521 Service Handbook P/N 59257803...
  • Page 57 Used when the same paper is used ALL of the time. Bypasses the automatic head gap adjustment. 1 is the narrowest gap setting. 9 is the widest gap setting. 1-7-01.tif Microline 520/521 Service Handbook 1 - 13 Specifications P/N 59257803...

  • Page 58: Print Modes

    Near Letter Utility High Speed Quality Draft Speed 80 (12 cpi) 320 (12 cpi) 427 (12 cpi) Matrix (H x V) 17 x 13 9 x 7 7 x 7 Specifications 1 - 14 Microline 520/521 Service Handbook P/N 59257803...

  • Page 59: Paper Specifications

    Thickness: 0.014 inches (0.36 millimeters) Rear Feed 0.017 inches (0.44 millimeters) Bottom Feed Paper Feed Path: Rear or Bottom Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6 Microline 520/521 Service Handbook 1 - 15 Specifications P/N 59257803...

  • Page 60: Cut Sheet

    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. Specifications 1 - 16 Microline 520/521 Service Handbook P/N 59257803...

  • Page 61: Labels

    7.2 to 14.3 inches (18.2 to 36.3 centimeters) Length: 3 to 17 inches (7.62 to 43.18 centimeters) Thickness: 0.14 inches (0.36 millimeters) Paper Feed Path: Printhead Gap Information: Refer to the Printhead Gap Information, Section 1.6. Microline 520/521 Service Handbook 1 - 17 Specifications P/N 59257803...

  • Page 62: Number Of Copies

    Original + 4 Interleaf Original + 4 Carbonless Original Cut Sheet 1.7.04 Thickness 0.014 inches / 0.36 mm Maximum Thickness, Rear Feed 0.017 inches / 0.44 mm Maximum Thickness, Bottom Feed Specifications 1 - 18 Microline 520/521 Service Handbook P/N 59257803...

  • Page 63: Weight

    Maximum: 10.5 inches (26.6 centimeters) Microline 521 Minimum: 3.5 inches ( 8.8 centimeters) Maximum: 16.5 inches (41.9 centimeters) Printing Area Microline 520 8 inches Maximum Microline 521 13.6 inches Maximum Microline 520/521 Service Handbook 1 - 19 Specifications P/N 59257803...

  • Page 64: Memory Specifications

    128 Kbyte Total Resident RAM Used as Receive Buffer Receive Buffer Size is selected through the Menu. Settings are: 64 K, 32 K, 1 line Print Buffer DLL Buffer Scratch Pad Specifications 1 - 20 Microline 520/521 Service Handbook P/N 59257803...

  • Page 65: Consumables

    CONSUMABLES 1.9.01 Ribbon CAUTION: Using a non-Okidata ribbon may damage the printhead and void any warranties. Material Nylon fabric, cartridge type, re-inking Type Black Ribbon Life (On average, at 10 characters per inch, Utility Mode) 4 million characters Microline 520/521 Service Handbook...

  • Page 66: Options

    1.10.01 Cut Sheet Feeders Single Bin The CSF-5000 is a narrow feeder for the Microline 520. Single Bin with envelope capability Paper Width: 7.2" to 8.5" (18.3 cm to 36.3 cm) Paper Length: 10.1" to 14" (25.6 cm to 35.6 cm) Capacity: 170 sheets (16 lb.), 100 sheets (20 lb.)

  • Page 67: Pull Tractor Kit

    Paper Types: Continuous Feed and Labels 1.10.04 Bottom Push Tractor Kit NOTE: The Bottom Push Tractor Kit (P/N 70022901) is a narrow feeder for the Microline 520. The Bottom Push Tractor Kit (P/N 70023101) is a wide feeder for the Microline 521. Bottom Feed 1-1-03.pcx...

  • Page 68: Roll Paper Stand

    Includes: Front Panel Control Utility and Drivers for Windows 3.0 & 3.1 NOTE: The OKISmart software includes three programs. OKISmart Control OKISmart Panel Emulator OKISmart Setup Refer to the Printer Handbook for more information. Specifications 1 - 24 Microline 520/521 Service Handbook P/N 59257803...

  • Page 69: Reliability

    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 and labor 1.11.07 Service Authorized OKIdata Service Centers Microline 520/521 Service Handbook 1 - 25 Specifications P/N 59257803...
  • Page 70 This page was intentionally left blank. Specifications 1 - 26 Microline 520/521 Service Handbook P/N 59257803...

  • Page 71: Section Two: Principles Of Operation

    SECTION TWO PRINCIPLES OF OPERATION...

  • Page 73: Electrical Operation

    The printer is comprised of the electrical components listed below. Main Control Board Power Supply Assembly Transformer Filter Board Operator Panel Space Motor / Line Feed Motor Printhead Microline 520/521 Service Handbook 2 - 1 Principles of Operation P/N 59257803...

  • Page 74: Main Control Board

    The MPU can access 1 Mbyte of program memory and 1 Mbyte of data memory space. The microprocessor controls the entire printer by executing the control program through the LSIs and the driver circuits. Principles of Operation 2 - 2 Microline 520/521 Service Handbook P/N 59257803...

  • Page 75: Block Diagram

    Block Diagram 2-1-01a.tif Microline 520/521 Service Handbook 2 - 3 Principles of Operation P/N 59257803...

  • Page 76: Program Rom

    Location 05CB: 511664Z The RAM is CMOS dynamic RAM with 65,536 words x 16-bit configuration. It is used as a receive buffer, print buffer and work buffer. 2-1-01c.tif Principles of Operation 2 - 4 Microline 520/521 Service Handbook P/N 59257803...

  • Page 77: Lsi

    I/O type memory (EEPROM). It is capable of electrically erasing and writing 1,024 bits. The EEPROM contains the menu data and the head drive time correction data. 2-1-01d.tif Microline 520/521 Service Handbook 2 - 5 Principles of Operation P/N 59257803...

  • Page 78: Initialization

    Finally, the program establishes the interface signals (P-I/F: ACK-P signal sending, and S-I/F: BUSY-N signal off) and lights the SELECT lamp to indicate that the printer is in the ON-LINE state. 2-1-02.tif Principles of Operation 2 - 6 Microline 520/521 Service Handbook P/N 59257803...

  • Page 79: Parallel Interface Control

    When the buffer is full and reception is not desired, the BUSY signal is sent to request data transmission be stopped. 2-1-03a.tif 2-1-03b.pcx Microline 520/521 Service Handbook 2 - 7 Principles of Operation P/N 59257803...

  • Page 80: Print Control

    The logic circuit of the printhead signals the LSI if a parity error is detected in the print data. 2-1-04b.tif Principles of Operation 2 - 8 Microline 520/521 Service Handbook P/N 59257803...

  • Page 81: Gap Adjust Control

    2-1-04c.tif Print Compensation Control The printhead compensates for the shape of the platen as shown below. NOTE: Also refer to Section 2.1.07 - Head Drive Time 2-1-04d.tif Microline 520/521 Service Handbook 2 - 9 Principles of Operation P/N 59257803...

  • Page 82: Space And Line Feed (Sp/Lf) Motor Control

    The serial data from the LSI (04B: MSM79V035) is processed by a register contained in the SP/LF motor driver to measure the overdrive time and to change the phase. 2-1-05d.tif Principles of Operation 2 - 10 Microline 520/521 Service Handbook P/N 59257803...

  • Page 83: Space Motor Control

    (the frequency division is based on the selected print pitch) to generate the signal IPT. The IPT signal provides dot-on timing and carriage position detection timing. 2-1-05c.tif Microline 520/521 Service Handbook 2 - 11 Principles of Operation P/N 59257803...

  • Page 84: Operation Panel

    Then, the specified I/O control will return the two byte command response to the MPU. 2-1-06a.tif Principles of Operation 2 - 12 Microline 520/521 Service Handbook P/N 59257803...
  • Page 85 2-1-06b.tif Microline 520/521 Service Handbook 2 - 13 Principles of Operation P/N 59257803...

  • Page 86: Alarm Circuit

    R542 and R544, then input to the A/D port of the MPU. The value of this voltage is used to control the drive time and the print speed (pass number) of the head. 2-1-07b.tif Principles of Operation 2 - 14 Microline 520/521 Service Handbook P/N 59257803...

  • Page 87: Head Drive Time

    The voltage of the TSD signal is monitored at the MPU A/D port to control the pass number and print method (uni-directional / bi-directional) at each of seven levels. 2-1-07c.tif Microline 520/521 Service Handbook 2 - 15 Principles of Operation...

  • Page 88: Power Supply Circuit

    Serial interface line voltage, comparator IC +10 VAC Serial interface line voltage and the printhead analog circuit +40 vdc Printhead, space motor and line feed motor drive voltage 2-1-08.tif Principles of Operation 2 - 16 Microline 520/521 Service Handbook P/N 59257803...

  • Page 89: Mechanical Operation

    Spring Assembly Wire, Armature, Spring, Yoke, Spacer Magnet Assembly Magnet, Core, Coil, Yoke Printed Circuit Board Logic Control, Print Driver, Analog Sensor Control and Thermistor Cooling Fin 2-2-01a.tif Microline 520/521 Service Handbook 2 - 17 Principles of Operation P/N 59257803...

  • Page 90: Printhead Gap Information

    Gap Control determines how the printhead gap is set. The settings are listed below. Auto Gap, Semi Auto Gap, 1, 2, 3, 4, 5, 6, 7, 8, 9 An explanation of each setting follows. Principles of Operation 2 - 18 Microline 520/521 Service Handbook P/N 59257803...
  • Page 91 Used when the same paper is used ALL of the time. Bypasses the automatic head gap adjustment. 1 is the narrowest gap setting. 9 is the widest gap setting. 1-7-01.tif Microline 520/521 Service Handbook 2 - 19 Principles of Operation P/N 59257803...

  • Page 92: Interconnect Diagram: Control Board To Printhead

    Interconnect Diagram: Control Board to Printhead NOTE: The printhead coil resistance values ARE NOT LISTED. The individual printwire control lines CANNOT be accessed on this printhead. 2-2-01b.pcx Principles of Operation 2 - 20 Microline 520/521 Service Handbook P/N 59257803...

  • Page 93: Line Feed Motor Resistance

    Line Feed Motor Resistance The resistance of each coil should be approximately 13 ohms. 2-2-01c.pcx Space Motor Resistance The resistance of each coil should be approximately 5 ohms. 2-2-01d.pcx Microline 520/521 Service Handbook 2 - 21 Principles of Operation P/N 59257803...

  • Page 94: Printhead Operation

    The voltage of the TSD signal is monitored at the MPU A/D port to control the pass number and print method (uni-directional / bi-directional) at each of seven levels. Principles of Operation 2 - 22 Microline 520/521 Service Handbook P/N 59257803...
  • Page 95 2-2-01e.pcx Microline 520/521 Service Handbook 2 - 23 Principles of Operation P/N 59257803...

  • Page 96: Spacing Mechanism

    In the same way, the rotation of the space motor can be recognized and controlled by measuring the phase relationship and the pulsewidth of the signals generated by the photosensors. Principles of Operation 2 - 24 Microline 520/521 Service Handbook P/N 59257803...
  • Page 97 2-2-02.tif Microline 520/521 Service Handbook 2 - 25 Principles of Operation P/N 59257803...
  • Page 98 NOTE: As the adjusting screw turns counter-clockwise, the gap narrows. As the adjusting screw turns clockwise, the gap widens. 2-2-03a.tif Principles of Operation 2 - 26 Microline 520/521 Service Handbook P/N 59257803...
  • Page 99 At this time, the armature resets, changing the head gap by one setting. The head gap is modified in .06 mm units for each range setting. 2-2-03b.tif Microline 520/521 Service Handbook 2 - 27 Principles of Operation P/N 59257803...
  • Page 100 This page was intentionally left blank. Principles of Operation 2 - 28 Microline 520/521 Service Handbook P/N 59257803...
  • Page 101 2-2-04a.tif in the ribbon drive assembly maintain uni-directional ribbon feed by switching the rotation direction of the gears. Microline 520/521 Service Handbook 2 - 29 Principles of Operation P/N 59257803...
  • Page 102 Status of Rear Tension of Rear Lever Pressure Roller Pressure Roller Pressure Roller Pressure Roller Bottom OPEN OPEN CLOSED 250 g CLOSED 700 g Rear CLOSED 90 g OPEN Principles of Operation 2 - 30 Microline 520/521 Service Handbook P/N 59257803...
  • Page 103 (middle) setting. If the lever is not correctly positioned, the ALARM lamp will light and the unit will not automatically load paper or receive data. 2-2-05b.tif Microline 520/521 Service Handbook 2 - 31 Principles of Operation P/N 59257803...
  • Page 104 B and idler gear A. The drive gear turns the pull tractor assembly, which feeds the continuous paper. 2-2-05e.tif Principles of Operation 2 - 32 Microline 520/521 Service Handbook P/N 59257803...
  • Page 105 Continuous Paper Feed (Push/Pull Tractor Mechanism) This mechanism consists of an optional pull tractor and a standard push tractor mechanism. Continuous paper is fed by these two tractors at the same time. 2-2-05G.tif Microline 520/521 Service Handbook 2 - 33 Principles of Operation P/N 59257803...
  • Page 106 Paper End Sensor (SNS2). NOTE: The method for detecting a paper-end condition is the reverse of the above. PAPER-END is detected when the Bottom Paper End Sensor (SNS2) is blocked. 2-39.tif Principles of Operation 2 - 34 Microline 520/521 Service Handbook P/N 59257803...
  • Page 107 Once the paper is ejected, the printhead slowly moves towards the left bracket. The support protector is latched in the stored position when it is pushed to approximately 5 mm from the left bracket. 2-2-07.tif Microline 520/521 Service Handbook 2 - 35 Principles of Operation P/N 59257803...
  • Page 108 2.2.08 Automatic Paper Load The Microline 520/521 printers will automatically detect cut sheet paper and feed the paper to the Top of Form (TOF) position. Cut Sheet Paper Set the change lever to the TOP FEED position. NOTE: When the change lever is in the TOP FEED position, the cut sheet detection lever contacts the cut sheet detection switch (BASW), which is located on the main control board.
  • Page 109 Place continuous feed paper in the appropriate tractor. Press the FF/LOAD switch. The line feed motor will feed the paper until the leading edge of the paper reaches the top of form position. 2-2-08b.tif Microline 520/521 Service Handbook 2 - 37 Principles of Operation P/N 59257803...
  • Page 110 The operator can press the SEL switch to reset the ALARM LED and press the PARK switch to continue the park operation. This operation may be useful when length of the paper to be parked is greater than 19 inches. 2-2-09.tif Principles of Operation 2 - 38 Microline 520/521 Service Handbook P/N 59257803...
  • Page 111 SECTION THREE MAINTENANCE...
  • Page 113 Needle Nose Pliers (4 Inch) Wire Cutters Digital Multimeter Feeler Gauge (capable of measuring .014 inches) Shop Vacuum Clean, soft, and lint-free Cloth All-Purpose Cleaner Contact Kleen (Okidata P/N 51802301) Platen Cleaner Machine Grease Machine Oil Microline 520/521 Service Handbook 3 - 1 Maintenance...
  • Page 114 Print Quality is darker on one side of the document. Parts are replaced Printhead (3.2.02) Space Motor Assembly (3.2.11) Space Rack (3.2.13) Guide Rail (3.2.15) Platen Assembly (3.2.19) Carriage Shaft (3.2.25) Maintenance 3 - 2 Microline 520/521 Service Handbook P/N 59257803...
  • Page 115 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.
  • Page 116 Both B.2.03 P/N 56624401 Cord: AC 240V Option RSPL Both B.2.08 P/N 70000803 Kit: Parallel Interface Option Both B.2.08 Plug’n’Play Accessory P/N 70012801 Kit: RS232-C Serial Interface Option Both B.2.08 Maintenance 3 - 4 Microline 520/521 Service Handbook P/N 59257803...
  • Page 117 3-2-01.pcx Microline 520/521 Service Handbook 3 - 5 Maintenance P/N 59257803...
  • Page 118 After installing the printhead, check the printhead gap adjustment. Refer to Section 3.3 of this Service Handbook. P/N 52107001 Ribbon: Black Consumable Both B.2.10 P/N 50707401 Clamp: Head RSPL Both B.2.07 P/N 50099501 Assembly: Printhead RSPL Both B.2.03 Maintenance 3 - 6 Microline 520/521 Service Handbook P/N 59257803...
  • Page 119 3-2-02.pcx Microline 520/521 Service Handbook 3 - 7 Maintenance P/N 59257803...
  • Page 120 3. Use a straight-slot screwdriver to release the extensions (2) from the carriage frame set (3). 4. Lift the ribbon protector (4) straight up and remove it. P/N 53562801 Protector: Ribbon RSPL Both B.2.07 Maintenance 3 - 8 Microline 520/521 Service Handbook P/N 59257803...
  • Page 121 3-2-03.pcx Microline 520/521 Service Handbook 3 - 9 Maintenance P/N 59257803...
  • Page 122 2. Use a straight-slot screwdriver to release the four claws (1) of the gear case assembly (2). 3. Lift and remove the gear case assembly. NOTE: Lubrication When lubricating, refer to Section 3.5 of this Service Handbook. P/N 51228501 Gear: Case (Assembly) RSPL Both B.2.07 Maintenance 3 - 10 Microline 520/521 Service Handbook P/N 59257803...
  • Page 123 3-2-04.pcx Microline 520/521 Service Handbook 3 - 11 Maintenance P/N 59257803...
  • Page 124 NOTE: Lubrication When lubricating, refer to Section 3.5 of this Service Handbook. P/N 53341501 Roller: Pull Up Assembly RSPL B.2.05 (Narrow) P/N 53341601 Roller: Pull Up Assembly (Wide) RSPL B.2.05 Maintenance 3 - 12 Microline 520/521 Service Handbook P/N 59257803...
  • Page 125 3-2-05.pcx Microline 520/521 Service Handbook 3 - 13 Maintenance P/N 59257803...
  • Page 126 Cover: Access (Narrow) RSPL B.2.02 P/N 53067201 Cover: Access (Wide) RSPL B.2.02 P/N 53067301 Cover: (B) for card slot RSPL Both B.2.03 P/N 53562601 Knob: Platen (ML500 Series) RSPL Both B.2.03 Maintenance 3 - 14 Microline 520/521 Service Handbook P/N 59257803...
  • Page 127 3-2-06.pcx Microline 520/521 Service Handbook 3 - 15 Maintenance P/N 59257803...
  • Page 128 The IC: EEPROM is soldered in on the board. P/N 55072401 PCB: FJIM (w/o ROM) RSPL Both B.2.03 P/N 55938301 IC: EEPROM BR93CC46A RSPL Both B.2.03 Maintenance 3 - 16 Microline 520/521 Service Handbook P/N 59257803...
  • Page 129 3-2-07.pcx Microline 520/521 Service Handbook 3 - 17 Maintenance P/N 59257803...
  • Page 130 B.2.03 P/N 50707501 Clamp: Cord RSPL Both B.2.03 P/N 56306201 Fuse: 1A 250V (Filter Brd 220V) Option RSPL Both B.2.03 P/N 56306101 Fuse: 2.5A 125V (Filter Board) RSPL Both B.2.03 Maintenance 3 - 18 Microline 520/521 Service Handbook P/N 59257803...
  • Page 131 AC Switch AC Inlet 3-2-08.pcx Microline 520/521 Service Handbook 3 - 19 Maintenance P/N 59257803...
  • Page 132 5. Open eight claws (3) and remove the operator panel board (4) from the operator panel (5). P/N 53562703 Panel: Operator RSPL Both B.2.03 P/N 55937502 PCB: LEOP (Operator Panel) RSPL Both B.2.03 Maintenance 3 - 20 Microline 520/521 Service Handbook P/N 59257803...
  • Page 133 3-2-09.pcx Microline 520/521 Service Handbook 3 - 21 Maintenance P/N 59257803...
  • Page 134 Do not touch the contacts of the PC connector. Do not touch the contacts of the space motor (3). Cleaning When cleaning, refer to Section 3.4 of this Service Handbook. P/N 56729601 Connector: PC HD40 RSPL Both B.2.07 Maintenance 3 - 22 Microline 520/521 Service Handbook P/N 59257803...
  • Page 135 3-2-10.pcx Microline 520/521 Service Handbook 3 - 23 Maintenance P/N 59257803...
  • Page 136 Guide: Roller Assembly Both B.2.07 P/N 53341901 Roller: Guide RSPL Both B.2.07 P/N 53342001 Holder: Guide Roller RSPL Both B.2.07 P/N N/A Both B.2.07 P/N N/A Guide Roller Spring Both B.2.07 Maintenance 3 - 24 Microline 520/521 Service Handbook P/N 59257803...
  • Page 137 3-2-11.pcx Microline 520/521 Service Handbook 3 - 25 Maintenance P/N 59257803...
  • Page 138 Do NOT sharply bend the carriage cable. You will slightly bow the cable to position it under the claws and over the projection. P/N 56627301 Cable: Carriage (Narrow) RSPL B.2.07 P/N 56627302 Cable: Carriage (Wide) RSPL B.2.07 Maintenance 3 - 26 Microline 520/521 Service Handbook P/N 59257803...
  • Page 139 3-2-12.pcx Microline 520/521 Service Handbook 3 - 27 Maintenance P/N 59257803...
  • Page 140 P/N 50923501 Spring: Tension (Space Rack) RSPL Both B.2.04 P/N 53563301 Rack: Space (Narrow) RSPL B.2.04 P/N 53563401 Rack: Space (Wide) RSPL B.2.04 Maintenance 3 - 28 Microline 520/521 Service Handbook P/N 59257803...
  • Page 141 3-2-13.pcx Microline 520/521 Service Handbook 3 - 29 Maintenance P/N 59257803...
  • Page 142 B.2.07 P/N 53341701 Roller: Back Up RSPL Both B.2.07 P/N 53341801 Holder: Back Up Roller RSPL Both B.2.07 P/N N/A Both B.2.07 P/N 50925001 Backup Roller Holder Spring Both B.2.07 Maintenance 3 - 30 Microline 520/521 Service Handbook P/N 59257803...
  • Page 143 3-2-14.pcx Microline 520/521 Service Handbook 3 - 31 Maintenance P/N 59257803...
  • Page 144 P/N 51009701 Guide: Rail Ground Clip RSPL Both B.2.04 P/N 51009801 Guide: Rail (Narrow) RSPL B.2.04 P/N 51009901 Guide: Rail (Wide) RSPL B.2.04 P/N 53067701 Cam: Adjust RSPL Both B.2.04 Maintenance 3 - 32 Microline 520/521 Service Handbook P/N 59257803...
  • Page 145 3-2-15.pcx Microline 520/521 Service Handbook 3 - 33 Maintenance P/N 59257803...
  • Page 146 2. Cut the nylon tie and release the cable. (Not shown). 3. Work the left ground plate (1) up, and then out, to remove it. P/N 51010301 Plate: Left Ground RSPL Both B.2.04 Maintenance 3 - 34 Microline 520/521 Service Handbook P/N 59257803...
  • Page 147 3-2-16.pcx Microline 520/521 Service Handbook 3 - 35 Maintenance P/N 59257803...
  • Page 148 You may have to use a screwdriver to work the plate tabs free. 3. Lift the plate and remove it. NOTE: Installation The plate must be securely seated under the claws. P/N 51010201 Plate: Right Ground RSPL Both B.2.05 Maintenance 3 - 36 Microline 520/521 Service Handbook P/N 59257803...
  • Page 149 3-2-17.pcx Microline 520/521 Service Handbook 3 - 37 Maintenance P/N 59257803...
  • Page 150 4. Turn the rear feed paper sensor lever (2) until the flag is at the top, then work the lever free. 5. Remove the lever. P/N 50804902 Lever: Sensor RSPL Both B.2.04 Cut Sheet/Continuous P/N 50804801 Lever: Rear Sensor RSPL Both B.2.04 Maintenance 3 - 38 Microline 520/521 Service Handbook P/N 59257803...
  • Page 151 3-2-15.pcx Microline 520/521 Service Handbook 3 - 39 Maintenance P/N 59257803...
  • Page 152 When cleaning, refer to Section 3.4 of this Service Handbook. Lubrication When lubricating, refer to Section 3.5 of this Service Handbook. P/N 50098301 Platen Assembly (Narrow) RSPL B.2.05 P/N 50098302 Platen Assembly (Wide) RSPL B.2.05 Maintenance 3 - 40 Microline 520/521 Service Handbook P/N 59257803...
  • Page 153 3-2-19.pcx Microline 520/521 Service Handbook 3 - 41 Maintenance P/N 59257803...
  • Page 154 P/N 53341401 Roller: Pressure Rear (Wide) RSPL B.2.06 P/N 50924701 Spring: Lock RSPL Both B.2.06 P/N 50097701 Paper Chute Assembly N RSPL B.2.06 P/N 50097801 Paper Chute Assembly W RSPL B.2.06 Maintenance 3 - 42 Microline 520/521 Service Handbook P/N 59257803...
  • Page 155 3-2-15.pcx Microline 520/521 Service Handbook 3 - 43 Maintenance P/N 59257803...
  • Page 156 A new gear must be installed. P/N 51228401 Gear: Line Feed Idle RSPL Both B.2.04 P/N 56510301 Motor: Line Feed (Assembly) RSPL Both B.2.04 P/N 56627201 Cord: Connection Line Feed RSPL Both B.2.04 Maintenance 3 - 44 Microline 520/521 Service Handbook P/N 59257803...
  • Page 157 3-2-21.pcx Microline 520/521 Service Handbook 3 - 45 Maintenance P/N 59257803...
  • Page 158 3. Reach from underneath the unit and press up at the extension (A) to free the spring from the claw. 4. While pressing up, slide the spring out (in the direction of Arrow B) and remove it. P/N 50923201 Spring: Reset RSPL Both B.2.05 Maintenance 3 - 46 Microline 520/521 Service Handbook P/N 59257803...
  • Page 159 3-2-22.pcx Microline 520/521 Service Handbook 3 - 47 Maintenance P/N 59257803...
  • Page 160 4. Remove the change lever. NOTE: Lubrication When lubricating, refer to Section 3.5 of this Service Handbook. P/N 50805101 Lever: Change RSPL Both B.2.05 P/N 51228201 Gear: Idle RSPL Both B.2.05 Maintenance 3 - 48 Microline 520/521 Service Handbook P/N 59257803...
  • Page 161 3-2-23.pcx Microline 520/521 Service Handbook 3 - 49 Maintenance P/N 59257803...
  • Page 162 P/N 50805301 Cam: Release RSPL Both B.2.05 P/N 50923301 Spring: Pressure (Narrow) RSPL B.2.06 P/N 50923401 Spring: Pressure (Wide) RSPL B.2.06 P/N 51228301 Arm: Front Release Gear RSPL Both B.2.06 Maintenance 3 - 50 Microline 520/521 Service Handbook P/N 59257803...
  • Page 163 Front Release Gear Shaft 3-2-24.pcx Microline 520/521 Service Handbook 3 - 51 Maintenance P/N 59257803...
  • Page 164 P/N 50923601 Spring: Support Protect Reset RSPL Both B.2.04 P/N 53067601 Protector: Support (Assembly) RSPL Both B.2.04 P/N 53563501 Shaft: Carriage (Narrow) RSPL B.2.04 P/N 53563502 Shaft: Carriage (Wide) RSPL B.2.04 Maintenance 3 - 52 Microline 520/521 Service Handbook P/N 59257803...
  • Page 165 3-2-15.pcx Microline 520/521 Service Handbook 3 - 53 Maintenance P/N 59257803...
  • Page 166 6. Repeat the above two steps, working towards the opposite end of the spring. 7. Remove the spring. P/N 50923001 Spring: Leaf (Narrow) RSPL B.2.04 P/N 50923101 Spring: Leaf (Wide) RSPL B.2.04 Maintenance 3 - 54 Microline 520/521 Service Handbook P/N 59257803...
  • Page 167 3-2-15.pcx Microline 520/521 Service Handbook 3 - 55 Maintenance P/N 59257803...
  • Page 168 Lever: Bottom Paper End RSPL Both B.2.04 P/N 50804701 Lever: Bottom Sensor RSPL Both B.2.04 P/N 51227801 Shaft: Front Release Gear RSPL B.2.06 (Narrow) P/N 51227901 Shaft: Front Release Gear (Wide) RSPL B.2.06 Maintenance 3 - 56 Microline 520/521 Service Handbook P/N 59257803...
  • Page 169 3-2-15.pcx Microline 520/521 Service Handbook 3 - 57 Maintenance P/N 59257803...
  • Page 170 4. Lift and remove the front pressure springs (3A and 3B). NOTE: The front pressure springs for the Microline 520 (3A) have three extensions. The front pressure springs for the Microline 521 (3B) have one extension. The Microline 521 uses both springs.
  • Page 171 3-2-15.pcx Microline 520/521 Service Handbook 3 - 59 Maintenance P/N 59257803...
  • Page 172 When lubricating, refer to Section 3.5 of this Service Handbook. P/N 50097501 Tractor: Assembly (Narrow) RSPL B.2.06 P/N 50097502 Tractor: Assembly (Wide) RSPL B.2.06 P/N 51228001 Gear: Change RSPL Both B.2.05 P/N 51228101 Gear: Tractor RSPL Both B.2.05 Maintenance 3 - 60 Microline 520/521 Service Handbook P/N 59257803...
  • Page 173 3-2-29.pcx Microline 520/521 Service Handbook 3 - 61 Maintenance P/N 59257803...
  • Page 174 Main Frame 1. All disassembly procedures must be carried out to reach the base frame (1). P/N 53563101 Frame: Main (Narrow) RSPL B.2.04/5/6 P/N 53563201 Frame: Main (Wide) RSPL B.2.04/5/6 Maintenance 3 - 62 Microline 520/521 Service Handbook P/N 59257803...
  • Page 175 3-2-15.pcx Microline 520/521 Service Handbook 3 - 63 Maintenance P/N 59257803...
  • Page 176 This page was intentionally left blank. Maintenance 3 - 64 Microline 520/521 Service Handbook P/N 59257803...
  • Page 177 The disassembly/assembly procedures list the required adjustments and refer you to this section. Failure to perform these procedures may result in unnecessary service calls. Microline 520/521 Service Handbook 3 - 65 Maintenance...
  • Page 178 Place a new ribbon cartridge in the printer before testing for parallelism. If the density of the top portion of the characters differ from that of the bottom portion, follow steps 10 - 12. Maintenance 3 - 66 Microline 520/521 Service Handbook P/N 59257803...
  • Page 179 The adjust cam lever is moved to ensure the printhead moves parallel to the platen. 4. Verification Phase Steps 13 -14 Verifies that the parallel adjustment phase did not affect the printhead gap modification phase. Microline 520/521 Service Handbook 3 - 67 Maintenance P/N 59257803...
  • Page 180 13. Check the printhead gap adjustment at the left, right, and center of the platen. 14. If the printhead gap is not the same at all three positions, return to step 6. Maintenance 3 - 68 Microline 520/521 Service Handbook P/N 59257803...
  • Page 181 Figure 1 Figure 2 3-3-01a.tif Microline 520/521 Service Handbook 3 - 69 Maintenance P/N 59257803...
  • Page 182 Reset Top of Form to Factory Default (1 inch) (Hold during Power-ON) QUIET Activate Rolling ASCII Test (Hold during Power-ON) Activate Font Test (Hold during Power-ON) SEL + FF/LOAD Activate Hexadecimal Dump Test (Hold during Power-ON) Maintenance 3 - 70 Microline 520/521 Service Handbook P/N 59257803...
  • Page 183 6. Press GROUP until the desired Group prints. 7. Press ITEM until the desired Item prints. 8. Press SET until the desired Setting prints. 9. Press EXIT to save the change and exit Menu Mode. Microline 520/521 Service Handbook 3 - 71 Maintenance P/N 59257803...
  • Page 184 Printing the Menu provides a reference of current menu settings. This will help you move through the menu. Okidata STRONGLY RECOMMENDS printing the Menu before resetting the Menu to factory defaults. Once the Menu is reset, all customized settings are LOST.
  • Page 185 Sample Menu 3-3-06.tif Microline 520/521 Service Handbook 3 - 73 Maintenance P/N 59257803...
  • Page 186 This page was intentionally left blank. Maintenance 3 - 74 Microline 520/521 Service Handbook P/N 59257803...
  • Page 187 Once the menu has been reset, all customized menu settings will be lost. Always print the menu before resetting the printer to factory defaults. To reset the menu to factory default settings: 1. Before resetting the Menu, Okidata STRONGLY RECOMMENDS printing the Menu. Printing the Menu provides a reference of customized settings.
  • Page 188 Limited Operation prevents the printer settings from being changed. This item cannot be changed through the OKI software. However, the print quality and SMART character pitch may be set through your software application packages. Maintenance 3 - 76 Microline 520/521 Service Handbook P/N 59257803...
  • Page 189 7. Press GROUP until Set-Up prints. 8. Press ITEM until Operator Panel Function prints. 9. Press SET until FULL OPERATION prints. 10. Press EXIT to save the change and exit Menu Mode. Microline 520/521 Service Handbook 3 - 77 Maintenance P/N 59257803...
  • Page 190 Menu Settings Factory default settings are printed in Bold Italic. The tables show all possible menu settings available with the Microline 520/521. What you will actually see depends on the active emulation and the options installed. Menu Settings Factory default settings are printed in Bold Italic.
  • Page 191 Factory default settings are printed in Bold Italic. The tables show all possible menu settings available with the Microline 520/521. What you will actually see depends on the active emulation and the options installed. Group Item Setting Rear Feed Line Spacing...
  • Page 192 Factory default settings are printed in Bold Italic. The tables show all possible menu settings available with the Microline 520/521. What you will actually see depends on the active emulation and the options installed. Group Item Setting Set-Up Graphics Uni-directional , bi-directional...
  • Page 193 Factory default settings are printed in Bold Italic. The tables show all possible menu settings available with the Microline 520/521. What you will actually see depends on the active emulation and the options installed. Group Item Setting Parallel I/F I-Prime...
  • Page 194 1. Power off the printer. 2. Press and hold the QUIET and FF/LOAD switches while you power on the printer. NOTE: The factory default Top of Form Setting is 1 inch. Maintenance 3 - 82 Microline 520/521 Service Handbook P/N 59257803...
  • Page 195 NOTE: When the printer is set to a different paper path, the printhead will travel back and forth. The pins are "gently" fired to sense paper thickness and set the printhead gap. Microline 520/521 Service Handbook 3 - 83 Maintenance...
  • Page 196 Paper will remain in the tear off position until the printer receives data. Then, the paper is retracted to the initial print position. To activate the Tear Feature, press TEAR. Maintenance 3 - 84 Microline 520/521 Service Handbook P/N 59257803...
  • Page 197 DO NOT use Forms Tear Off with labels or multi-part forms. Remember to activate the Form Tear Off for the paper path you are using (rear feed or bottom feed). Microline 520/521 Service Handbook 3 - 85 Maintenance P/N 59257803...
  • Page 198 The customers may have worked with other Okidata printers and DID NOT experience the problem with the other printer(s). The difference is that the Microline 520 and Microline 521 printers DO NOT have a bail arm. The paper does not feed as "high" as it would in a printer with a bail arm.
  • Page 199 2. Press and hold TEAR. When you release TEAR, the paper will return to the tear off position. 3. The paper will retract to the Top of Form position. 4. Release TEAR. 5. The paper advances to the tear bar position. Microline 520/521 Service Handbook 3 - 87 Maintenance P/N 59257803...
  • Page 200 Always print the menu before resetting the printer to factory defaults. To reset the menu to factory default settings, follow this procedure. 1. Before resetting the Menu, Okidata STRONGLY RECOMMENDS printing the Menu. Printing the Menu provides a reference of customized settings.
  • Page 201 Area around carriage shaft 3.2.25 Vacuum, Cloth, and All-purpose cleaner Space Rack 3.2.13 Vacuum Paper Paths Vacuum, Cloth, and All-purpose cleaner Platen 3.2.19 Cloth and Platen cleaner Covers 3.2.06 Cloth and All-purpose cleaner Microline 520/521 Service Handbook 3 - 89 Maintenance P/N 59257803...
  • Page 202 The Lubrication Table will direct you to use the following amounts of lubricant. 1. Medium Oil: three to four drops Grease: thin coating (approximately .015 inch) 2. Small Oil: one drop Grease: extremely thin coating (approximately .008 inch) Maintenance 3 - 90 Microline 520/521 Service Handbook P/N 59257803...
  • Page 203 Do NOT lubricate the space rack. Lubricating the space rack will attract dust. If enough dust accumulates on the space rack, printing problems will occur. 9. Teeth of the gears in the Gear Case Assembly Microline 520/521 Service Handbook 3 - 91 Maintenance...
  • Page 204 When shipping the printer, use the original packaging to prevent damage. Be sure to secure the printhead so it will not move during shipment. 1. Locate the original packaging or order replacement packaging from Okidata. (Refer to Appendix B) 2. Make sure the printhead is secured so it will not move during shipment.
  • Page 205 The product MUST be returned with ALL originally supplied factory items. Be sure to secure the printhead so it will not move during shipment. 1. Locate the original packaging or order replacement packaging from Okidata. (Refer to Appendix B) 2. Locate the originally supplied factory items.
  • Page 206 This page was intentionally left blank. Maintenance 3 - 94 Microline 520/521 Service Handbook P/N 59257803...
  • Page 207 SECTION FOUR FAILURE ANALYSIS...
  • Page 209 8. Section 4.2 lists methods for reporting problems. If you encounter a situation that is NOT addressed by the documentation in this kit, please report the problem to Okidata, using one of the methods listed. Refer to the Service Center Reference Guide for information on contacting Okidata. Microline 520/521 Service Handbook 4 - 1...
  • Page 210 This page was intentionally left blank. Failure Analysis 4 - 2 Microline 520/521 Service Handbook P/N 59257803...
  • Page 211 This header provides the following information: printer model (1), emulation (2), country (3), firmware revision level (4), firmware part number (5) and character generator revision number (6). This information is often required while performing service or when contacting Okidata. Have this information available during your service call. ML520 EI A F/W 01.22...
  • Page 212 Errors and corrections in the training materials are listed in the Training Section of Okilink II. The Technical Service Bulletins (also known as Okidata’s Monthly Mail) are available via Okilink II. Situations that are NOT addressed in the reference documentation, technical service bulletins, or round-tables may be reported to the Dealer Service and Support Engineers (Contact Technical Support) or the Technical Training Group.
  • Page 213 Telephone and Fax Numbers (with area / country access codes) Product Name Unit’s Serial Number Firmware Revision Level Description of Problem Document Name (with page number or procedure) with error or problem. Microline 520/521 Service Handbook 4 - 5 Failure Analysis P/N 59257803...
  • Page 214 4.3.02 Okilink II Okilink II is Okidata’s Bulletin Board Service. This service is available to all Okidata Certified Service Technicians. Okilink II provides troubleshooting and service information. Technicians can download files, ask questions of Okidata’s technical support personnel, and participate in round table discussions about Okidata products and services.
  • Page 215 2. Does the paper being used meet the specifications for this product? 3. Has the ribbon been replaced as recommended? 4. Has the ribbon been installed properly? 5. Is an Okidata ribbon being used? 6. Is the printhead gap correctly set? 7. Is the firmware the latest (current) revision? 8.
  • Page 216 Refer to the Start Here Flowchart (Section 4.4.03) and perform the corrective action. ALARM Lamp Lights (Paper End/Jam Conditions) A solid ALARM Lamp usually indicates a cover open, paper jam or paper-end (out of paper) condition. Failure Analysis 4 - 8 Microline 520/521 Service Handbook P/N 59257803...
  • Page 217 Does the parallel or serial interface port receive data from the host PC properly? End of procedure. Which port is not receiving data? Parallel Refer to RAP 10. Serial Refer to RAP 11. Microline 520/521 Service Handbook 4 - 9 Failure Analysis P/N 59257803...
  • Page 218 2. Make sure that the paper you are using is within specifications. Paper specifications can be found in Section 1 of this Service Handbook. Failure Analysis 4 - 10 Microline 520/521 Service Handbook P/N 59257803...
  • Page 219 NOTE: This feature also prevents access to the Menu. To access the Menu, power OFF the printer, then hold down the SEL key while powering ON. Microline 520/521 Service Handbook 4 - 11 Failure Analysis P/N 59257803...
  • Page 220 Tear Off. Exit Menu Mode. Deselect the printer and set the paper position, using the Micro Feed buttons (hold SHIFT while pressing MICRO FEED UP or DOWN). Enter Menu Mode and enable Form Tear Off. Exit Menu Mode. Failure Analysis 4 - 12 Microline 520/521 Service Handbook P/N 59257803...
  • Page 221 To eliminate this problem, enter the Menu Mode (hold down the SHIFT button while pressing SEL/MENU button) and change the I-Prime item (in the Parallel I/F Group) to Invalid. Microline 520/521 Service Handbook 4 - 13 Failure Analysis...
  • Page 222 ABNORMAL OUTPUT 4.5.01 Output Samples Uneven Print Light Print on Density the Entire Page Inconsistent Smeared Print Line Feed Drifting Margin 4-5-01.pcx Failure Analysis 4 - 14 Microline 520/521 Service Handbook P/N 59257803...
  • Page 223 1. Power OFF the printer. Move the carriage assembly. The carriage should move smoothly. If it does not, remove the cause of the binding. 2. Refer to the next section and / or Technical Service Bulletin 3309. Microline 520/521 Service Handbook 4 - 15 Failure Analysis...
  • Page 224 This page was intentionally left blank. Failure Analysis 4 - 16 Microline 520/521 Service Handbook P/N 59257803...
  • Page 225 Carriage: Frame Set Motor: Space Rack: Space Cable: Printhead Board: Main Control 6. If the problem continues, check all assemblies and connections. Then, contact Okidata Technical Information for further assistance. Microline 520/521 Service Handbook 4 - 17 Failure Analysis P/N 59257803...
  • Page 226 5. The Troubleshooting Tables will provide a Failure Description, Probable Cause and Recommended Action. 6. The Recommended Action will direct you to the actions listed below. Follow a specific RAP Replace items in a listed order. Failure Analysis 4 - 18 Microline 520/521 Service Handbook P/N 59257803...
  • Page 227 Blinking Blinking Blinking Blinking Blinking Blinking Blinking Blinking Blinking Blinking Blinking Blinking Blinking Blinking Blink Blink Blinking Blinking NOTE: Reference Numbers 25 and 26 use identical Operator Panel displays Microline 520/521 Service Handbook 4 - 19 Failure Analysis P/N 59257803...

  • Page 228: Failure Analysis

    Replace the main control board, and/or ROM. RAM on Main Control Board Read/write error Replace the main control board. CG ROM Alarm Check sum error Replace the main control board. Failure Analysis 4 - 20 Microline 520/521 Service Handbook P/N 59257803...
  • Page 229 Wait until the space motor cools. exceeds specified value The printer should resume printing. If the problem persists, replace the space motor. If that does not solve the problem, replace the main control board Microline 520/521 Service Handbook 4 - 21 Failure Analysis P/N 59257803...
  • Page 230 2. Find the RAP which is associated with the printer’s problem. 3. Go to the appropriate RAP. 4. All RAPs begin with a START statement, followed by questions or another type of statement. Failure Analysis 4 - 22 Microline 520/521 Service Handbook P/N 59257803...
  • Page 231 Printhead Homing Error Paper Jam During Paper Loading Printhead Not Firing Pins Poor Print Quality Ribbon Feed Problem Line Feed Problem Operator Panel Malfunction Parallel Interface Problem Serial Interface Problem Microline 520/521 Service Handbook 4 - 23 Failure Analysis P/N 59257803...
  • Page 232 Replace the following in the order listed below. Check operation before replacing next item in list. 1. Operation Panel. 2. Power Transformer. Has the problem been resolved? End of procedure. Contact Technical Support. Failure Analysis 4 - 24 Microline 520/521 Service Handbook P/N 59257803...
  • Page 233 1. Ribbon Feed Mechanism. 2. Carriage Cable. 3. Main Control Board 4. PROM 05CA Has the problem been resolved? End of procedure. Contact Technical Support. Microline 520/521 Service Handbook 4 - 25 Failure Analysis P/N 59257803...
  • Page 234 Is the fuse F2 on the main control board open? Go to B. Replace the main control board. Has the problem been resolved? End of procedure. Go to B. Failure Analysis 4 - 26 Microline 520/521 Service Handbook P/N 59257803...
  • Page 235 End of procedure. Replace the ribbon feed mechanism Has the problem been resolved? End of procedure. Replace the PROM (O5CA) Has the problem been resolved? End of procedure. Contact Technical Support. Microline 520/521 Service Handbook 4 - 27 Failure Analysis P/N 59257803...
  • Page 236 Are there any breaks in the carriage cable? Replace the carriage cable assembly. Go to A Verify that ribbon feed mechanism is properly fastened to the space motor assembly. Go to A Failure Analysis 4 - 28 Microline 520/521 Service Handbook P/N 59257803...
  • Page 237 Replace the main control board. Has the problem been resolved? End of procedure. Replace the space motor assembly. Has the problem been resolved? End of procedure. Contact Technical Support. Microline 520/521 Service Handbook 4 - 29 Failure Analysis P/N 59257803...
  • Page 238 Check the front pressure springs to see that they are mounted properly. There are three springs in the Microline 520 and five springs in the Microline 521. Check the tension of all the front pressure rollers to see if they are the same. Top springs: 250 g.
  • Page 239 End of procedure. Replace the carriage cable. Has the problem been resolved? End of procedure. Replace the space motor assembly. Has the problem been resolved? End of procedure. Contact Technical Support. Microline 520/521 Service Handbook 4 - 31 Failure Analysis P/N 59257803...
  • Page 240 Does the head gap indicator display a range of 9? Go to A Replace the ribbon feed mechanism. Has the problem been resolved? End of procedure. Go to C Failure Analysis 4 - 32 Microline 520/521 Service Handbook P/N 59257803...
  • Page 241 Replace the space motor assembly. Has the problem been resolved? End of procedure. Replace the main control board. Has the problem been resolved? End of procedure. Contact Technical Support. Microline 520/521 Service Handbook 4 - 33 Failure Analysis P/N 59257803...
  • Page 242 Replace the tractor feed assembly. End of procedure. Check the gears on the tractor feed assembly and platen assembly for broken or missing teeth. Replace the defective assembly. Go to A Failure Analysis 4 - 34 Microline 520/521 Service Handbook P/N 59257803...
  • Page 243 Replace the line feed motor assembly. Has the problem been resolved? End of procedure. Replace the main control board. Has the problem been resolved? End of procedure. Contact Technical Support. Microline 520/521 Service Handbook 4 - 35 Failure Analysis P/N 59257803...
  • Page 244 This page was intentionally left blank. Failure Analysis 4 - 36 Microline 520/521 Service Handbook P/N 59257803...
  • Page 245 Replace the operation panel board. Has the problem been resolved? End of procedure. Replace the main control board. Has the problem been resolved? End of procedure. Contact Technical Support. Microline 520/521 Service Handbook 4 - 37 Failure Analysis P/N 59257803...
  • Page 246 Check that the cable is properly connected to the Host PC and the correct LPT port is selected. Does the SEL LED light? Go to A Change the menu item I-prime to invalid. End of procedure. Failure Analysis 4 - 38 Microline 520/521 Service Handbook P/N 59257803...
  • Page 247 Replace the interface cable. Has the problem been resolved? End of procedure. Replace the main control board. Has the problem been resolved? End of procedure. Contact Technical Support. Microline 520/521 Service Handbook 4 - 39 Failure Analysis P/N 59257803...
  • Page 248 Check the serial interface parameters for the RS232C (in the Printer Menu): baud rate, word length, parity, protocol, busy signal and parity. Has the problem been resolved? End of procedure Go to B Failure Analysis 4 - 40 Microline 520/521 Service Handbook P/N 59257803...
  • Page 249 Replace the RS232C board. Has the problem been resolved? End of procedure. Contact Technical Support. Replace the main control board. Has the problem been resolved? End of procedure. Contact Technical Support. Microline 520/521 Service Handbook 4 - 41 Failure Analysis P/N 59257803...
  • Page 250 This page was intentionally left blank Failure Analysis 4 - 42 Microline 520/521 Service Handbook P/N 59257803...
  • Page 251 The Rolling ASCII and Font Tests check print operations. The Serial Interface Loopback Test checks the operation of the serial interface board. The Hexadecimal Dump Mode checks the data transfer between the computer and printer. Microline 520/521 Service Handbook 4 - 43 Failure Analysis...
  • Page 252 At the top of the test is the printer type (1), emulation (2), country (3), and firmware revision level (4). This information is often required while performing service or when contacting Okidata. Have this test available during your service call. CAUTION Before running this test, make sure that continuous feed paper is loaded.
  • Page 253 Sample 4-8-02.tif Microline 520/521 Service Handbook 4 - 45 Failure Analysis P/N 59257803...
  • Page 254 At the top of the test is the printer type (1), emulation (2), country (3), and firmware revision level (4). This information is often required while performing service or when contacting Okidata. Have this test available during your service call. CAUTION Running the test without paper loaded will allow the printhead to print on the platen.
  • Page 255 Sample 4-8-03.tif Microline 520/521 Service Handbook 4 - 47 Failure Analysis P/N 59257803...
  • Page 256 10. The receive data line receives the characters. 11. The message buffer stores the characters. 12. The data prints. 13. The test runs until the printer is powered off or the SELECT switch is pressed. Failure Analysis 4 - 48 Microline 520/521 Service Handbook P/N 59257803...
  • Page 257 1. Jumper the following pins together. Pin 2 to Pin 3 Pin 4 to Pin 5 Pin 8 to Pin 11 Pin 6 to Pin 20 RS232-C Serial Loopback Test Connector (DB25P Plug) 4-8-04.tif Microline 520/521 Service Handbook 4 - 49 Failure Analysis P/N 59257803...
  • Page 258 Indicates that the printer is not ready to receive data Not Used Data Terminal Ready From Printer Indicates that the printer is not ready to receive data Not Used Failure Analysis 4 - 50 Microline 520/521 Service Handbook P/N 59257803...
  • Page 259 Commonly Used Serial Cable Configurations IBM 25-Pin Cable Configuration Computer Printer IBM 9-Pin Cable Configuration Computer Printer Microline 520/521 Service Handbook 4 - 51 Failure Analysis P/N 59257803...
  • Page 260 7. The printer is ready to receive data in the Hexadecimal Dump Mode. 8. Send data to the printer from the computer. 9. To exit Hexadecimal Dump Mode, power OFF the printer. Failure Analysis 4 - 52 Microline 520/521 Service Handbook P/N 59257803...
  • Page 261 Sample 4-8-05.tif Microline 520/521 Service Handbook 4 - 53 Failure Analysis P/N 59257803...
  • Page 262 The charts on the following pages provide information needed to determine if the printhead and motors used in the printer are defective. NOTE: The printhead coil resistance values ARE NOT LISTED. The individual printwire control lines CANNOT be accessed on this printhead. Failure Analysis 4 - 54 Microline 520/521 Service Handbook P/N 59257803...
  • Page 263 Layout Diagram 4-6-01a.pcx Microline 520/521 Service Handbook 4 - 55 Failure Analysis P/N 59257803...
  • Page 264 4.9.02 Printhead Interconnect Diagram: Control Board to Printhead NOTE: The printhead coil resistance values ARE NOT LISTED. The individual printwire control lines CANNOT be accessed on this printhead. 4-9-02.pcx Failure Analysis 4 - 56 Microline 520/521 Service Handbook P/N 59257803...
  • Page 265 Line Feed Motor Resistance The resistance of each coil should be approximately 13 ohms. 4-9-03.pcx 4.9.04 Space Motor Resistance The resistance of each coil should be approximately 5 ohms. 4-9-04.pcx Microline 520/521 Service Handbook 4 - 57 Failure Analysis P/N 59257803...
  • Page 266 This page was intentionally left blank. Failure Analysis 4 - 58 Microline 520/521 Service Handbook P/N 59257803...
  • Page 267 APPENDIX A BOARD DIAGRAMS...
  • Page 269 This section describes the characteristics of the printed circuit boards used in the unit. The following areas are covered. Function Firmware Fuses Jumpers Sensors Switches Test Points Where an item is not applicable, the word NONE will be listed. Microline 520/521 Service Handbook A - 1 Board Diagrams P/N 59257803...
  • Page 270 INDEX TO CHARTS Description Board Designation Section Main Controller Board FJIM A.2.01 Operator Panel Board LEOP A.2.02 Power Supply Assembly A.2.03 Space Motor Board A.2.04 RS232-C Serial Interface Board LXHI A.2.05 Board Diagrams A - 2 Microline 520/521 Service Handbook P/N 59257803...
  • Page 271 A-2-00.pcx Microline 520/521 Service Handbook A - 3 Board Diagrams P/N 59257803...
  • Page 272 Logic Ground CN1 pin 33 +5 vdc : CN7 - Pin 6 (logic circuitry voltage) +40 vdc: CN7 - Pins 29 and 31 (Printhead, Space Motor / Line Feed Motor Drive Voltage) Board Diagrams A - 4 Microline 520/521 Service Handbook P/N 59257803...
  • Page 273 05CB (DRAM)) BASW 05CA SNS1 SNS2 A-2-01.pcx Microline 520/521 Service Handbook A - 5 Board Diagrams P/N 59257803...
  • Page 274 NONE Fuses NONE Jumpers NONE Sensors NONE Switches SEL (Select) SHIFT LF (Line Feed) FF (Form Feed) TEAR PARK QUIET PQ (Print Quality) CP (Character Pitch) Test Points NONE Board Diagrams A - 6 Microline 520/521 Service Handbook P/N 59257803...
  • Page 275 LEOP PCB SHIFT TEAR PARK QUIET A-2-02.pcx Microline 520/521 Service Handbook A - 7 Board Diagrams P/N 59257803...
  • Page 276 CN 3 pin 4: 0 VAC CN 3 pin 5: 0 VAC CN 3 pin 6: 6.6 VAC CN 3 pin 7: 0 VAC CN 3 pin 8 : 18.5 VAC Board Diagrams A - 8 Microline 520/521 Service Handbook P/N 59257803...
  • Page 277 Secondary Primary To Main Controller Transformer Noise Filter Board (6 wires) ON / OFF Switch Frame Ground A-2-03.pcx Microline 520/521 Service Handbook A - 9 Board Diagrams P/N 59257803...
  • Page 278 These signals governs the speed and direction of the space motor via the LSI and microprocessor. Firmware NONE Fuses NONE Jumpers NONE Sensors Photosensor: used to monitor space motor movement. Switches NONE Test Points NONE Board Diagrams A - 10 Microline 520/521 Service Handbook P/N 59257803...
  • Page 279 Space motor Assembly Connector (Auto-Gap Mechanism) Encoder Disk Photosensor Printhead Gap Adjusting Screw A-2-04.pcx Microline 520/521 Service Handbook A - 11 Board Diagrams P/N 59257803...
  • Page 280 Masked to the MPU: Socket is empty Fuses NONE Jumpers SP1: EPROM Address Select Jumper (position as shown) EPROM is masked to MPU Sensors NONE Switches NONE Test Points NONE Board Diagrams A - 12 Microline 520/521 Service Handbook P/N 59257803...
  • Page 281 Default Setting A-2-05.tif Microline 520/521 Service Handbook A - 13 Board Diagrams P/N 59257803...
  • Page 282 This page was intentionally left blank. Board Diagrams A - 14 Microline 520/521 Service Handbook P/N 59257803...
  • Page 283 APPENDIX B ILLUSTRATED PARTS LISTING...
  • Page 285 Use Section Four (Failure Analysis) to determine the defective part(s). Locate the part and its part number in this section. Appendix B is cross-referenced to Section Three (Maintenance). Microline 520/521 Service Handbook B - 1 Illustrated Parts Listing P/N 59257803...
  • Page 286 Format The format for this appendix is a series of tables with diagrams. The tables contain the item reference number, the Okidata and Oki-Japan (Oki-J) part numbers, the part description, a comments section, and the disassembly procedure. Item Okidata P/N...
  • Page 287 Current Part Numbers Okidata has made every effort to include current part numbers in this Service Handbook at the time of publishing. However, technical information frequently changes. These changes often include new or modified parts, with new or modified part numbers.
  • Page 288 Parts in assemblies will say "Part of xx" under the Comments section of the tables. Blank Okidata does not recommend stocking this item. This item should be purchased on an As Required Basis only. The availability of this item is NOT guaranteed by Okidata.
  • Page 289 This part is specific to the Microline 520 printer. This part is specific to the Microline 521 printer. Both This part is used by both the Microline 520 and Microline 521 printers. Microline 520/521 Service Handbook B - 5 Illustrated Parts Listing...
  • Page 290 Please read, understand, and follow these procedures. Service Authorization for a specific product must be obtained before a Dealer can submit warranty claims. Direct questions regarding the Service Center Reference Guide to Okidata Dealer Service. Refer to the Service Center Reference Guide for information on contacting Okidata.
  • Page 291 Your Purchase Order Number • Okidata Part Number(s) • Use this Appendix, Okilink II, Faxable Facts, or contact Okidata Technical Support to find the correct part number. Refer to the Service Center Reference Guide for information on contacting Okidata. Microline 520/521 Service Handbook...
  • Page 292 Printer Unit (2 of 3) B.2.06 Printer Unit (3 of 3) B.2.07 Carriage Assembly B.2.08 Options B.2.09 Option Parts B.2.10 Consumables B.2.11 Packing Materials B.2.12 Documentation B.2.13 Service Training Kit Revision List Illustrated Parts Listing B - 8 Microline 520/521 Service Handbook P/N 59257803...
  • Page 293 Sheet Guide Assembly Access Cover Assembly Upper Cover AC Power Cable Power Supply Assembly Pull-up Roller Assembly Control Board Operation Board Assembly Main Frame B-2-00.pcx Microline 520/521 Service Handbook B - 9 Illustrated Parts Listing P/N 59257803...
  • Page 294 (Epson/IBM/ML Comp.) 120 V 62409002 Printer: ML520 Parallel (Epson/IBM/ML Comp.) 220 V 62410001 Printer: ML521 Parallel (Epson/IBM/ML Comp.) 120 V 62410002 Printer: ML521 Parallel (Epson/IBM/ML Comp.) 220 V Illustrated Parts Listing B - 10 Microline 520/521 Service Handbook P/N 59257803...
  • Page 295 B-2-30.pcx Microline 520/521 Service Handbook B - 11 Illustrated Parts Listing P/N 59257803...
  • Page 296 3.2.06 1PP4094-7201P2 51009401 Guide: Sheet (Narrow) RSPL 3.2.06 51009501 Guide: Sheet (Wide) RSPL 3.2.06 53067101 Cover: Access (Narrow) RSPL 3.2.06 2PA4094-7381G1 53067201 Cover: Access (Wide) RSPL 3.2.06 2PA4094-7382G1 Illustrated Parts Listing B - 12 Microline 520/521 Service Handbook P/N 59257803...
  • Page 297 B-2-01.pcx Microline 520/521 Service Handbook B - 13 Illustrated Parts Listing P/N 59257803...
  • Page 298 Clamp: Cord RSPL 3.2.08 4PP4025-3621P1 Both 56306201 Fuse: 1A 250V (Filter Brd 220V) Option RSPL 3.2.08 540A2062T2102 Both 56306101 Fuse: 2.5A 125V (Filter Board) RSPL 3.2.08 540A2067T1252 Both Illustrated Parts Listing B - 14 Microline 520/521 Service Handbook P/N 59257803...
  • Page 299 B-2-02.pcx Microline 520/521 Service Handbook B - 15 Illustrated Parts Listing P/N 59257803...
  • Page 300 Shaft: Carriage (Narrow) RSPL 3.2.25 4PP4025-3381P1 53563502 Shaft: Carriage (Wide) RSPL 3.2.25 4PP4025-3381P2 53067601 Protector: Support (Assembly) RSPL 3.2.25 4PA4025-3382G1 Both 50923601 Spring: Support Protect Reset RSPL 3.2.25 4PB4025-3385P1 Both Illustrated Parts Listing B - 16 Microline 520/521 Service Handbook P/N 59257803...
  • Page 301 B-2-03.pcx Microline 520/521 Service Handbook B - 17 Illustrated Parts Listing P/N 59257803...
  • Page 302 Platen Assembly (Narrow) RSPL 3.2.19 3PA4025-3370G1 50098302 Platen Assembly (Wide) RSPL 3.2.19 53341501 Roller: Pull Up Assembly (N) RSPL 3.2.05 3PA4025-3440G2 53341601 Roller: Pull Up Assembly (W) RSPL 3.2.05 3PA4025-3530G2 Illustrated Parts Listing B - 18 Microline 520/521 Service Handbook P/N 59257803...
  • Page 303 B-2-04.pcx Microline 520/521 Service Handbook B - 19 Illustrated Parts Listing P/N 59257803...
  • Page 304 Roller: Pressure Rear (Narrow) RSPL 3.2.20 3PB4025-3364P1 53341401 Roller: Pressure Rear (Wide) RSPL 3.2.20 3PB4025-3517P1 50097501 Tractor: Assembly (Narrow) RSPL 3.2.29 3PA4025-3330G1 50097502 Tractor: Assembly (Wide) RSPL 3.2.29 3PA4025-3330G2 Illustrated Parts Listing B - 20 Microline 520/521 Service Handbook P/N 59257803...
  • Page 305 B-2-05.pcx Microline 520/521 Service Handbook B - 21 Illustrated Parts Listing P/N 59257803...
  • Page 306 4PP4025-3392P1 Both 53341801 Holder: Back Up Roller 3.2.14 3PP4025-3393P1 Both 3.2.14 Both 50925001 Holder: Backup Roller Spring 3.2.14 3PP4025-3397P1 Both 50098901 Carriage: Frame Set RSPL 3.2.25 4PP4025-3394G1 Both Illustrated Parts Listing B - 22 Microline 520/521 Service Handbook P/N 59257803...
  • Page 307 B-2-06.pcx Microline 520/521 Service Handbook B - 23 Illustrated Parts Listing P/N 59257803...
  • Page 308 Fuse: 1A 250V (Filter Brd 220V) Option RSPL 540A2062T2102 Both NOTE: The Microline 520/521 printers are not shipped with an interface cable. The end user must purchase an interface cable separate from the printer. Illustrated Parts Listing B - 24 Microline 520/521 Service Handbook...
  • Page 309 B-2-07.pcx Microline 520/521 Service Handbook B - 25 Illustrated Parts Listing P/N 59257803...
  • Page 310 Roller: Hopping (L.H.) CSF Option 4PB4053-1705G1 Both 50062802 Roller: Hopping (R.H.) CSF Option 4PB4053-1705G2 Both 53321501 Support: Rear Sheet CSF Option 3PB4025-1941P1 Both 53448501 Sheet: Friction CSF Option 4PB4025-1914P1 Both Illustrated Parts Listing B - 26 Microline 520/521 Service Handbook P/N 59257803...
  • Page 311 No pictures were available at press time. Microline 520/521 Service Handbook B - 27 Illustrated Parts Listing P/N 59257803...
  • Page 312 Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information. Item Okidata P/N Description Comments Disassembly Oki-J P/N Refer to B.1.02 Procedure 52107001 Ribbon: Black Consumable 3.2.02 Both Illustrated Parts Listing B - 28 Microline 520/521 Service Handbook P/N 59257803...
  • Page 313 B-2-09.pcx Microline 520/521 Service Handbook B - 29 Illustrated Parts Listing P/N 59257803...
  • Page 314 Oki-J P/N Refer to B.1.02 Procedure 53565101 Box: Graphic (ML520) RSPL 53565201 Box: Graphic (ML521) RSPL 53565401 Foam: Molded (Left) RSPL Both 53565402 Foam: Molded (Right) RSPL Both Illustrated Parts Listing B - 30 Microline 520/521 Service Handbook P/N 59257803...
  • Page 315 No pictures were available at press time. Microline 520/521 Service Handbook B - 31 Illustrated Parts Listing P/N 59257803...
  • Page 316 To order Marketing Literature, complete an Okidata Marketing Literature Order Form. Fax the completed form to Okidata Marketing Communications. Obtain this form by faxing a request to Okidata Marketing Communications. Refer to the Service Center Reference Guide for information on contacting Okidata. See the following pages Illustrated Parts Listing...
  • Page 317 To order Marketing Literature, complete an Okidata Marketing Literature Order Form. Fax the completed form to Okidata Marketing Communications. Obtain this form by faxing a request to Okidata Marketing Communications. Refer to the Service Center Reference Guide for information on contacting Okidata. See the following pages Microline 520/521 Service Handbook...
  • Page 318 B.2.13 Service Training Kit Revision List P/N 58229401 Microline 520/521 Service Training Kit This kit was replaced by P/N 58229402. Items in the training kit (except for the Printer Handbook) are NOT available separately. Item Okidata P/N Description Comments Disassembly Oki-J P/N Refer to B.1.02...
  • Page 319 P/N 58229402 Microline 520/521 Service Training Kit This kit was replaced by P/N 58229403. Items in the training kit (except for the Printer Handbook) are NOT available separately. Item Okidata P/N Description Comments Disassembly Oki-J P/N Refer to B.1.02 Procedure...
  • Page 320 This page was intentionally left blank. Illustrated Parts Listing B - 36 Microline 520/521 Service Handbook P/N 59257803...
  • Page 321 Microline 520/521 Service Handbook P/N 59257803...

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