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HP Color LaserJet 8500, 8500N, 8500DN Printer Hardware Service Training

HP Color LaserJet 8500, 8500N, 8500DN Printer Hardware Service Training. Course Overview. Section 1: Printer Overview Section 2: Printer Hardware Section 3: Printer Troubleshooting. Printer models, options, and walk-around Theory of operation Consumables. Section 1 Agenda.

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HP Color LaserJet 8500, 8500N, 8500DN Printer Hardware Service Training

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  1. HP Color LaserJet 8500, 8500N, 8500DN Printer Hardware Service Training

  2. Course Overview • Section 1: Printer Overview • Section 2: Printer Hardware • Section 3: Printer Troubleshooting

  3. Printer models, options, and walk-around Theory of operation Consumables Section 1 Agenda

  4. HP Color LaserJet 8500 (base model) and 8500 N HP Color LaserJet 8500 DN Differences Between Models

  5. Options and Accessories Paper-handling: • Duplexer • Multi-bin mailbox (8500 DN only) Communications: • HP JetDirect 600N internal print server Memory: • Printer hard disk (external EIO) • Font DIMMs • Synchronous DRAM DIMMs

  6. Printer control panel Left output bin Front door Input tray 2 Power button Input tray 3 Input tray 4 Top output bin Flip-up media stop Right upper door Input tray 1 Right lower door VTU (verticaltransfer unit) Printer components, front view

  7. Air filter door Formatter board Rear cover Left upper door Left lower door Power connector Printer components, rear view

  8. DIMM slots Optional printerhard disklocation EIO slot 2 Printer output connector(C-link connector) EIO slot 1 Parallel IEEE-1284interface port(C-size) Formatter Assemblies

  9. Printer Features • Print speed • Black-and-white • Color • Resolution • Processor speed

  10. Duplexer Multi-binmailbox Tray 1 Trays 2 and 3 2,000-sheetinput tray Paper Handling Features

  11. Printer Control Panel Overview LCD Display - Value + Cancel Job Menu Go Item • Ready • Data • Select • Attention

  12. Laser/scanner Black tonercartridge Color tonercarousel Face-upoutput bin Fuser Imaging drum cartridge Imaging drum Transfer drum Transfer belt Input trays Printer components, internal

  13. Theory of Operation

  14. Preconditioning exposure Primary charging Electronic Latent Image Formation • Laser beam exposure

  15. Black toner Color toner Developing

  16. Primary transfer Transfer • Post charging

  17. Secondary transfer Separation Transfer (continued)

  18. Residual toner is picked up by the imaging drum Transfer Drum Cleaning

  19. Imaging Drum Cleaning • Residual toner is scraped from the imaging drum

  20. Toner is heated, fusing it to media Fusing

  21. Color Calibration • Color calibration density sensor reads the density detection patternon the transfer drum • Calibrationoccurs at regularintervals

  22. Color Toner Level Detection • Color toner level sensor (PS621) • Light emitted and received by the sensor • Data sent to controller board

  23. Drum kit (imaging drum) Consumables Kits • Transfer kit • Fuserkit

  24. Section 2 Agenda • Removal and replacement notes • Covers and doors • Interlocks

  25. Removal and Replacement Notes • Power off • Scanner assembly • Imaging drum • ESD warning • Tools required

  26. Top cover Front cover Front right cover Right lower cover Right upper cover Right cover subassembly Right rear lower corner cover Top, Front, and Right Covers

  27. Exhaust fan cover Rear cover Left upper cover Left rear cover Left lower cover Rear and Left Covers

  28. Right upper cover detection Interlocks • Drum cartridge detection

  29. Black toner cartridge detection Toner carousel door detection Interlocks (continued)

  30. Left lower cover / front cover detection Pickup unit cover detection Interlocks (continued)

  31. Laser shutter detection Interlocks (continued)

  32. Left upper cover detection Interlocks (continued)

  33. Lab Directions

  34. Section 3 Agenda • Pretroubleshooting checklist • Maintenance • Troubleshooting flowchart • Printer control panel messages • Diagnostics • Paper path • Image defects

  35. Pretroubleshooting Checklist • Maintenance • Media • Environment • Configuration

  36. Maintenance • Density sensor • Post charger • Transfer charger • Waste toner drawer • Color toner position sensor

  37. Troubleshooting Flowchart 1 Power supply on and ready? 2 Jam from test print? 3 Output problem from test print? 4 Image defect from test print? 5 Image defect from full-color print (from computer)? 6 Other malfunction status from full-color print?

  38. Printer Control Panel Messages • Media jams • Required maintenance • Numbered messages

  39. Configuration page Event log Other self-test pages Service menu Cold reset Paper-handling devices diagnostics 2,000-sheet input tray diagnostics Multi-bin mailbox diagnostics Diagnostics Overview

  40. Configuration Page

  41. Event Log • Paper jam errors • Disk failures • EIO errors • Fan errors • Motor errors • Catastrophic errors • Numbered printer control panel messages

  42. Other Self-Test Pages • LaserJet demonstration • Continuous configuration pages • Test pages from Color LaserJet 8500 Service and Support CD-ROM

  43. Service Menu • NVRAM settings • Formatter diagnostics • Paper path test • Developer motor test • Drum motor test • Sensor monitor test • Exit service mode

  44. Performing a cold reset Reset to factory defaults: user-accessible printer variables color adjust values user-accessible EIO values Not reset to factory defaults: page counts service mode variables event log is not cleared Cold Reset

  45. Jams General paper path checklist Paper Path

  46. Print Quality • General imageformation checklist • Color variations • Defects: horizontal vs. vertical

  47. Developer roller Charge roller Cleaning roller Developer DSD wheels Transfer roller Fuser Imaging drum Transfer belt Transfer drum Repetitive Defect Causes

  48. Smooth halftone adjust section Detail halftone adjust section Color Balance Color ramps Neutral axes

  49. Summary • Questions • Topic review • Objectives review • Documentation list review • Additional resources • Evaluation forms/feedback

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