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Oki ML421 Maintenance Manual

Also see for ML420 Series: Specification sheetUser guideUser guideInstallationInstallation

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Contents
  1. maintenance manual
  2. Table Of Contents
  3. Table Of Contents
  4. Standard Printer Configuration
  5. Options
  6. Electrical Operation
  7. Initialization
  8. Interface Control
  9. Print Control
  10. SP/LF Motor Control
  11. Operation Panel
  12. Alarm Circuit
  13. Power Supply Circuit
  14. Mechanical Operation
  15. Spacing Operation
  16. Head Gap Adjusting
  17. Ribbon Drive
  18. Paper Feed Operation
  19. Paper Detection Mechanism
  20. Automatic Sheet Feed
  21. Paper Park Function
  22. Precaution for Parts Replacement
  23. Service Tools
  24. Disassembly/Reassembly Procedure
  25. Printhead
  26. Ribbon Protector
  27. Pull-up Roller Assy
  28. Upper Cover Assy, Access Cover Assy and Sheet Guide Assy
  29. Gear Case Assy
  30. PC Connector
  31. Space Motor, Guide Roller Assy
  32. Space Rack
  33. Carriage Cable
  34. Backup Roller Holder Assy
  35. Platen Assy
  36. Control Board (NNS)
  37. LF Motor
  38. Operation Panel Board (LEOP)
  39. Power Supply Board (TPW)
  40. Transformer Assy
  41. Change Lever and Gears
  42. Carriage Shaft
  43. Paper Pan
  44. Rear Tractor Assy
  45. Rear Pressure Assy
  46. Switch Lever
  47. ADJUSTMENT
  48. CLEANING AND LUBRICATION
  49. Lubrication
  50. TROUBLESHOOTING AND REPAIR
  51. Lamp Display
  52. Connection Circuit Check for Printhead and SP/LF Motor
  53. Troubleshooting flow chart
  54. APPENDIX A PCB LAYOUT
  55. APPENDIX B SPARE PARTS LIST
  56. APPENDIX C RS-232C SERIAL INTERFACE BOARD (OPTION)
  57. Circuit Description
  58. Communication Procedure Flowchart
  59. Mode b
  60. TROUBLESHOOTING FLOWCHART
  61. Local Test
Oki ML421 Maintenance Manual Manual pdf 100 page image
42113901 Rev.2 100 /Oki Data CONFIDENTIAL6.4 Connection Circuit Check for Printhead and SP/LF Motor(1) PrintheadSignal Connector pin numberCN11 #12 #23 #44 #65 #867891011 #912 #713 #514 #315Thermistor(5KΩ at 25°C)HEAD1HEAD2HEAD4HEAD6HEAD80VHTEMP+50V+50V+50VHEAD9HEAD7HEAD5HEAD3NC
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This manual is suitable for:
ML420 SeriesML421 Series
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