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Oki ML490 Maintenance Manual

Also see for ML490 Series: User guideInstallationInstallationUser guideSafety & warranty

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Contents
  1. Table Of Contents
  2. Table Of Contents
  3. Standard Printer Configuration
  4. Options
  5. Electrical Operation
  6. Initialization
  7. Interface Control
  8. Print Control
  9. SP/LF Motor Control
  10. Operation Panel
  11. Alarm Circuit
  12. Power Supply Circuit
  13. Mechanical Operation
  14. Spacing operation (See Figure 2-4.)
  15. Head gap adjusting (See Figure 2-5.)
  16. Ribbon drive (See Figure 2-6.)
  17. Paper feed operation
  18. Paper detection mechanism (See Figure 2-14.)
  19. Automatic sheet feed
  20. Paper park function (continuous paper)
  21. Precaution for Parts Replacement
  22. Service Tools
  23. Disassembly/Reassembly Procedure
  24. Printhead
  25. Ribbon Protector
  26. Pull-up Roller Assy
  27. Upper Cover Assy, Access Cover Assy and Sheet Guide Assy
  28. Gear Case Assy
  29. PC Connector
  30. Space Motor, Guide Roller Assy
  31. Space Rack
  32. Carriage Cable
  33. Backup Roller Holder Assy
  34. Platen Assy
  35. Control Board (TFS)
  36. LF Motor
  37. Operation Panel Board (LEOP)
  38. Power Supply Board (TPW)
  39. Transformer Assy
  40. Change Lever and Gears
  41. Carriage Shaft
  42. Paper Pan
  43. Rear Tractor Assy
  44. Rear Pressure Assy
  45. Switch Lever
  46. ADJUSTMENT
  47. CLEANING AND LUBRICATION
  48. Lubrication
  49. TROUBLESHOOTING AND REPAIR
  50. Lamp Display
  51. Connection Circuit Check for Printhead and SP/LF Motor
  52. Troubleshooting flow chart
  53. APPENDIX A PCB LAYOUT
  54. APPENDIX B SPARE PARTS LIST
  55. APPENDIX C RS-232C SERIAL INTERFACE BOARD (OPTION)
  56. Circuit Description
  57. Communication Procedure Flowchart
  58. Mode b
  59. TROUBLESHOOTING FLOWCHART
  60. Local Test
Oki ML490 Maintenance Manual Manual pdf 30 page image
42114101 Rev.1 30 /2.1.9 Power Supply CircuitThis power supply circuit supplies the +3.3VDC, +5VDC, +12VDC, +42VDC, +50VDC and -8VDC.SWAC FuseNoisefiltercircuitTrans-formerPower supply boardControl boardRectifierConverterRectifierRegulationCircuit+50V+12V+5V+5V-8VConverter +3.3V+50V Converter +42VThe uses of output voltages and signals are described below.Voltage/signal Use+3.3C USB Controller drive+5V Logic IC/LED drive+12V Serial interface line, FAN motor drive+42V LF motor / SP motor drive+50V Printhead and Option CSF motor drive-8V Serial interface line
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This manual is suitable for:
ML490 SeriesML491 Series
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