Oki ML421 Maintenance Manual
Also see for ML420 Series: Specification sheetUser guideUser guideInstallationInstallation
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Contents
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42113901 Rev.2 4 /Oki Data CONFIDENTIALContents1. CONFIGURATION ...............................................................................................61.1 Standard Printer Configuration ............................................................................................ 61.2 Options ................................................................................................................................. 72. THEORY OF OPERATION ..................................................................................92.1 Electrical Operation .............................................................................................................. 92.1.1 Summary ................................................................................................................. 92.1.2 Microprocessor and the Peripheral Circuit .............................................................. 92.1.3 Initialization ........................................................................................................... 162.1.4 Interface Control ................................................................................................... 172.1.5 Print Control .......................................................................................................... 202.1.6 SP/LF Motor Control ............................................................................................. 222.1.7 Operation Panel .................................................................................................... 252.1.8 Alarm Circuit ......................................................................................................... 272.1.9 Power Supply Circuit ............................................................................................. 302.2 Mechanical Operation ........................................................................................................ 312.2.1 Printhead Mechanism and Operation ................................................................... 312.2.2 Spacing Operation ................................................................................................ 342.2.3 Head Gap Adjusting .............................................................................................. 352.2.4 Ribbon Drive ......................................................................................................... 372.2.5 Paper Feed Operation .......................................................................................... 382.2.6 Paper Detection Mechanism ................................................................................. 482.2.7 Automatic Sheet Feed .......................................................................................... 502.2.8 Paper Park Function ............................................................................................. 523. ASSEMBLY/DISASSEMBLY ..............................................................................533.1 Precaution for Parts Replacement ..................................................................................... 533.2 Service Tools ..................................................................................................................... 543.3 Disassembly/Reassembly Procedure ................................................................................ 553.3.1 Printhead ............................................................................................................... 573.3.2 Ribbon Protector ................................................................................................... 583.3.3 Pull-up Roller Assy ................................................................................................ 593.3.4 Upper Cover Assy, Access Cover Assy and Sheet Guide Assy ........................... 603.3.5 Gear Case Assy .................................................................................................... 613.3.6 PC Connector ....................................................................................................... 623.3.7 Space Motor, Guide Roller Assy ........................................................................... 633.3.8 Space Rack ........................................................................................................... 643.3.9 Carriage Cable ...................................................................................................... 653.3.10 Backup Roller Holder Assy ................................................................................... 663.3.11 Platen Assy ........................................................................................................... 673.3.12 Control Board (NNS) ............................................................................................. 683.3.13 LF Motor ................................................................................................................ 693.3.14 Operation Panel Board (LEOP) ............................................................................ 703.3.15 Power Supply Board (TPW) .................................................................................. 713.3.16 Transformer Assy .................................................................................................. 723.3.17 Change Lever and Gears ...................................................................................... 733.3.18 Carriage Shaft ....................................................................................................... 743.3.19 Paper Pan ............................................................................................................. 75 |
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