Oki ML521 manual Service Guide ML520/521

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Page: 43

Service Guide ML520/521

Chapter 2 Principles of Operation

2.2MECHANICAL OPERATION 2.2.01 Printhead Mechanism

The printhead is a spring-charged, 9-pin printhead. It is attached to the carriage, which moves parallel to the platen. Electrically, the printhead is controlled by the main control board via the carriage cable and the space motor.

The printhead is composed of the following parts.

Wire Guide

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

Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Contents ML520 // ML521 Dot Matrix Printers About This ManualService Guide ML520/521 Maintenance & Disassembly Failure & Repair Analysis Illustrated Parts Listing Table of Contents Service Guide ML520/521 Page Product Specifications General Information Printer Weight Microline MicrolineProduct Specifications Power RequirementsAmbient Temperature and Relative Humidity RH AltitudeProduct Specifications Agency Approvals 1.5.01 Listings CPI CPS Horiz. DPI Vert. DPIIPS HSDUPC a UPC E EAN Front Panel Switches Graphics ResolutionEmulations Fonts Near Letter QualityMenu Mode Switch Action Line Feed Increments FixedSelects Group Function Form Feed / Load Selects ItemPaper Loading Paper Out DetectionPaper Tear Capabilities Print Method Printhead Type General InformationPrinthead Gap Adjustment Gap ControlAuto Gap Semi Auto GapPrint Modes 80 12 cpi 320 12 cpi 427 12 cpiPaper Specifications Types Card StockContinuous Form Cut SheetEnvelopes LabelsTransparency Weight LengthNumber of Copies ThicknessWidth PaperPrinting Area Memory Specifications EepromEprom 03 RAMProduct Specifications Consumables 1.9.01 Ribbon Dual Bin Page Product Specifications Pull Tractor Kit Product Specifications Bottom Push Tractor Kit Product Specifications Serial Interface Product Specifications Roll Paper Stand Product Specifications OKISmart Typer Utility OKISmart Panel UtilityReliability Principles of Operation Electrical OperationPrinciples of Operation Main Control Board Principles of Operation Block Diagram Principles of Operation Program ROM RAM LSI Service Guide ML520/521 Reset operation initiated by I-PRIME does not reset the MPU Principles of Operation InitializationPrinciples of Operation Parallel Interface Control Principles of Operation Print Control Principles of Operation LSI/Printhead Interface Principles of Operation Gap Adjust Control Principles of Operation Print Compensation Control Also refer to .1.07 Head Drive TimeService Guide ML520/521 Principles of Operation Line Feed Motor Control Principles of Operation Space Motor Control Principles of Operation Encoder Disk Principles of Operation Operation Panel Page Service Guide ML520/521 Principles of Operation Low Motor Drive Voltage Alarm Principles of Operation Head Drive Time Less than 50% +34 vdc or greaterPrinciples of Operation Head Overheat Alarm Processing Principles of Operation Power Supply Circuit Voltage/Signal PurposeService Guide ML520/521 Principles of Operation Printhead Gap Information Page Service Guide ML520/521 Principles of Operation Line Feed Motor Resistance Principles of Operation Space Motor Resistance Principles of Operation Printhead Operation Page Principles of Operation Printhead Temperature Principles of Operation Spacing Mechanism Principles of Operation Spacing Operation Head Gap Setting Operation Principles of Operation Head Gap MechanismPage Principles of Operation Ribbon Drive Operation Page Principles of Operation Line Feed Mechanism Change Lever Paper Path Selection LeverPaper Clamp Mechanism Page Rear/Bottom Feed for continuous feed paper Page Principles of Operation Cut Sheet Paper Feed Operation Service Guide ML520/521 Service Guide ML520/521 Service Guide ML520/521 Service Guide ML520/521 Rear Feed Detection Bottom Feed DetectionPage Principles of Operation Support Protector Mechanism Principles of Operation Automatic Paper Load Cut Sheet PaperPrinciples of Operation Continuous Feed Paper Principles of Operation Paper Park Paper Park OperationMaintenance & Disassembly General Information Maintenance & Disassembly Maintenance Tools Maintenance & Disassembly Maintenance Precautions Handbook when the any of the following occurService Guide ML520/521 Maintenance & Disassembly Preliminary Items Page Maintenance & Disassembly Printhead Assembly Perform this procedurePage Maintenance & Disassembly Ribbon Protector Perform these procedures 3.2.01 ,53562801 Protector Ribbon Rspl Both B.2.07 Maintenance & Disassembly Gear Case Assembly Maintenance & Disassembly Pull-up Roller Assembly When cleaning, refer to .4 of this Service Handbook Page Maintenance & Disassembly Control Board Fjim InstallationPage Maintenance & Disassembly Power Supply Assembly Page Maintenance & Disassembly Operator Panel PCB Leop Perform these procedures 3.2.01 , 3.2.06 ,Maintenance & Disassembly PC Connector Perform these procedures 3.2.01 , 3.2.02 ,56729601 Connector PC HD40 Rspl Both B.2.07 Perform these procedures 3.2.01 , 3.2.02 , 3.2.04 , Page Maintenance & Disassembly Carriage Cable Perform these procedures 3.2.01 , 3.2.06 , 3.2.07 ,Maintenance & Disassembly Space Rack When cleaning, refer to .4 of this Service HandbookPage Maintenance & Disassembly Roller/Holder Backup Assembly Maintenance & Disassembly Guide Rail and Adjust Cam Page Maintenance & Disassembly Left Ground Plate 51010301 Plate Left Ground Rspl Both B.2.04Maintenance & Disassembly Right Ground Plate 51010201 Plate Right Ground Rspl Both B.2.05Perform these procedures 3.2.01 , 3.2.06 , 3.2.07 , 3.2.16 , Maintenance & Disassembly Platen Assembly When lubricating, refer to .5 of this Service HandbookPage Maintenance & Disassembly Paper Chute Assembly Page Maintenance & Disassembly Line Feed Motor Assembly 56627201 Cord Connection Line Feed Rspl Both B.2.04 Maintenance & Disassembly Reset Spring 50923201 Spring Reset Rspl Both B.2.05Maintenance & Disassembly Idle Gear and Change Lever Page Maintenance & Disassembly Pressure Spring Page Maintenance & Disassembly Carriage Shaft Page Maintenance & Disassembly Leaf Spring Page Maintenance & Disassembly Bottom Paper Sensor Levers Page Maintenance & Disassembly Front Pressure Roller Assembly Page Maintenance & Disassembly Tractor Assembly Page Page Maintenance & Disassembly Main Frame Service Guide ML520/521 Procedure Setup Phase Printhead Gap Modification Phase Parallel Adjustment PhaseVerification Phase Page Maintenance & Disassembly Key Combinations Description SEL + FF/LOADMenu Mode Printing the MenuReset Menu to Factory Defaults ProcedureLimited Operation General Information Page Maintenance & Disassembly Menu Settings Group SettingValid Yes No Page Maintenance & Disassembly Top of Form General Information Setting Top of FormReset the Top of Form to Factory Default Maintenance & Disassembly Paper Park General Information Procedure Continuous Feed to Single SheetProcedure Single Sheet to Continuous Feed Maintenance & Disassembly Tear Feature Maintenance & Disassembly Forms Tear Off Vertical Line Spacing ProblemsUsing Checking Top of Form with Form Tear Off ActivatedFactory default Top of Form Setting is 1 inch Maintenance & Disassembly CleaningCleaning Schedule Cleaning ToolsLubrication Lubrication ScheduleLubrication Types Lubrication AmountsAreas Not Lubricated Return for Service Shipping InstructionsAll Other Returns Failure & Repair Analysis Introduction Service Guide ML520/521 Failure & Repair Analysis Firmware Revision Identification HeaderService Guide ML520/521 Failure & Repair Analysis Problem Lists Failure & Repair Analysis Reporting Methods Okilink Course CritiqueFax Number Mailing AddressTechnical Service Bulletins OkilinkFaxable Facts Service Guide ML520/521 Failure & Repair Analysis Problem Categories Alarm Lamp Blinks Fatal ErrorsOperational Errors Alarm Lamp Lights Paper End/Jam ConditionsFailure & Repair Analysis Start Here Flowchart StartFailure & Repair Analysis Tips for Preventing Image Problems This Service HandbookFailure & Repair Analysis Common Problems Always power OFF the printer before you turn the platen knob Page Uneven Print Density Smeared Print Inconsistent Line FeedDrifting Margin Failure & Repair Analysis Left Margin Drifting Problem Fault Alarms Failure & Repair AnalysisAlar Utility PRO NLQ HSD Menu Blinkin Kin Refer to RAP Page Service Guide ML520/521 Failure & Repair Analysis RAP Index RAP Number Description Start Page Failure & Repair Analysis RAP 02 No Spacing Operation Page Failure & Repair Analysis RAP 03 Printhead Homing Error Page Service Guide ML520/521 Failure & Repair Analysis RAP 05 Printhead Pins Not Firing Failure & Repair Analysis RAP 06 Poor Print Quality Failure & Repair Analysis RAP 07 Ribbon Feed Problem Failure & Repair Analysis RAP 08 Line Feed Problem Page Failure & Repair Analysis RAP 09 Operation Panel Malfunction Failure & Repair Analysis RAP 10 Parallel Interface Problem Page Failure & Repair Analysis RAP 11 Serial Interface Problem Handbook Printer Tests Procedure Page Failure & Repair Analysis Font Test General Information Page Loopback Connector Configuration Failure & Repair Analysis Serial Interface Loopback TestPage Failure & Repair Analysis Serial Cable Information Service Guide ML520/521 Service Guide ML520/521 Example Hex Data DumpService Guide ML520/521 Layout Diagram Service Guide ML520/521 Failure & Repair Analysis Line Feed Motor Resistance Failure & Repair Analysis Space Motor Resistance Service Guide ML520/521 Chapter a Reference Charts Description Board Designation Section Main Controller BoardOperator Panel Board Chapter a Reference Charts Board Layout Switches FirmwareFuses JumpersPage Shift Page Chapter a Reference Charts Power Supply Assembly Function Page Chapter a Reference Charts Space Motor Board Function Page Masked to the MPU Socket is empty Page Service Guide ML520/521 Chapter B Illustrated Parts Listing Format Chapter B Illustrated Parts Listing Current Part Numbers RememberRspl 520 521Both Placing a Parts Order Charts Chapter B Illustrated Parts Listing Overview Comments Refer toComments Refer to 53067201 2PA4094-7382G1 Cover Access Wide Rspl ROM PCB Leop Service Guide ML520/521 Page Service Guide ML520/521 Page Service Guide ML520/521 Page Page Service Guide ML520/521 N/A Service Guide ML520/521 PCB Lxhi Service Guide ML520/521 PCB Ncsf Chapter B Illustrated Parts Listing Consumables 52107001 N/A Ribbon Black Consumable BothComments Refer To B.1.02Service Guide ML520/521 Page Okidata P/N Oki-J Description Comments Refer Comments Refer
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