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General| Printer Type | Dot Matrix Printer |
|---|---|
| Emulation | Epson FX, IBM ProPrinter |
| Resolution | 240 x 216 dpi |
| Noise Level | 55 dB |
| Interface | Parallel, Serial |
| Paper Size | Letter, Legal, A4, Custom |
| Number of Pins | 9-pin |
Overview of ML520/521 printers, OKISMART features, and warranty details.
Dimensions and weight specifications for ML520 and ML521 printers.
Details on input power, power consumption, and power frequency.
Acoustic ratings, altitude, and ambient temperature/humidity specifications.
Listings of UL, CSA, FCC, IEC, VDE, and BS agency approvals.
Character matrix sizes, print speeds, and characters per line for ML520/521.
Specifications for card stock, continuous form, cut sheet, envelopes, labels, and transparency.
Details on EEPROM, EPROM, and RAM specifications for the printer.
Information about the printer ribbon, including material, type, and life.
Details on Cut Sheet Feeders, Pull Tractor Kit, Bottom Push Tractor Kit, and Serial Interface.
Mean Time Before Failure (MTBF), To Repair (MTTR), Printer Life, and Printhead Life.
Lists the electrical components comprising the printer.
Description of the main control board, its microprocessor, and memory access.
Describes the printer's initialization steps upon power-on.
Explains control signals and data flow for the parallel interface.
How print data is transmitted and automatic head gap adjustment.
Details on Space and Line Feed (SP/LF) motor control and operation.
How the MPU reads switch data and the operator panel LED display.
Details driver circuit alarm processing and overheating response.
Lists the voltages supplied by the switching power supply circuit.
Overview of the printhead mechanism and its components.
Explains the three factors influencing printhead gap information.
Details line feed, paper detection, automatic load, and paper park features.
Guidance on maintenance, adjustment, cleaning, lubrication, and shipping procedures.
Lists the necessary tools for performing printer servicing.
Important safety and best practice guidelines for disassembly and assembly.
General information and procedures for disassembling and assembling the printer.
Steps for removing and installing the printhead assembly.
Instructions for releasing and removing the ribbon protector.
Steps for removing and disassembling the gear case assembly.
Procedure for removing the pull-up roller assembly.
Steps to remove the upper cover, access cover, and sheet guide assemblies.
Steps for removing and installing the control board (FJIM).
Procedures for removing the transformer and filter board assemblies.
Steps for removing and installing the operator panel PCB.
Procedure for removing and installing the PC connector.
Steps for removing the space motor and roller guide assemblies.
Procedure for removing and installing the carriage cable.
Steps for removing the space rack.
Procedure for removing the roller/holder backup assembly.
Steps for removing the guide rail and adjust cam.
Procedures for removing the left and right ground plates.
Procedure for removing paper feed sensor levers.
Steps for removing the platen assembly.
Procedure for removing the paper chute assembly.
Steps for removing the line feed motor assembly.
Procedure for removing the reset spring.
Steps for removing the idle gear and change lever.
Procedure for removing the pressure spring.
Steps for removing the carriage shaft.
Procedure for removing the leaf spring.
Steps for removing bottom paper sensor levers.
Procedure for removing the front pressure roller assembly.
Steps for removing the tractor assemblies.
Procedure for disassembling the main frame.
Introduction to printer adjustment procedures.
Detailed procedure for adjusting the printhead gap.
Lists key combinations for accessing special functions and tests.
Guides on navigating and using the printer's menu system.
Procedure for setting and resetting the Top of Form position.
How to use the Paper Park feature for switching between paper types.
Manual activation of the tear feature for off-edge paper tearing.
Automatic tear-off and vertical spacing troubleshooting.
Procedures for resetting menus to factory defaults.
General information on cleaning the printer and its components.
General information on printer lubrication procedures and amounts.
Instructions for returning the printer for service or other returns.
Overview of the failure analysis section and how to use it.
How to identify the printer's revision level using the serial number.
How to identify firmware revision and part numbers by printing tests.
Encourages reporting of problems encountered with training materials.
Information on how Okidata distributes updated troubleshooting information.
Preliminary checks to perform before troubleshooting.
Categories of printer problems: fatal errors and operational errors.
A flowchart to help diagnose printer problems.
Advice on preventing image quality issues like faded print.
Lists common problems and their potential causes and solutions.
Visual examples of abnormal print outputs and their causes.
Guidelines for using troubleshooting tables for fault alarms.
Introduction to using Repair Analysis Procedures (RAPs).
Index of common printer problems and corresponding RAP numbers.
Procedures for diagnosing and fixing specific printer problems (RAPs 01-11).
Overview of printer tests for diagnostics.
Procedures and purposes of Rolling ASCII, Font, and Serial Loopback tests.
Requirements for serial cables connecting the printer and computer.
Procedure to engage Hexadecimal Dump Mode for viewing data transfer.
General description of resistance checks for printer components.
Interconnect diagrams and resistance values for key components.
Overview of reference charts for printed circuit boards.
Details on Main Controller, Operator Panel, Power Supply, Space Motor, and Serial Interface boards.
Introduction to the illustrated parts listing appendix.
Guides on parts listing format, current numbers, ordering, and definitions.
Index to illustrated parts breakdown charts for the printer and its components.
Parts lists for printer units, assemblies, options, consumables, and packing materials.
