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HP Color LaserJet Enterprise M855 Printer series

Color Definition:   Cyan:    Magenta:    Yellow:    Black:
Yellowgreen:    Greenyellow:

1. Print Quality Troubleshooting Home ›

1-1. Order Supplies ›
1-2. Full color background issue ›
1-3. Print PQ troubleshooting pages ›

2. Issues on PQ troubleshooting test pages

2-1. Interpreting PQ troubleshooting test pages ›
2-2. Interpreting repetitive issues ›
2-3. All issues on PQ troubleshooting test pages
    Cyan ›     Magenta ›     Black ›    
    Yellowgreen ›     Greenyellow ›
2-4. Toner smear
   Cyan ›    Magenta ›    Black ›    Yellow-green ›    Green-yellow ›   
2-5. ITB cleaning blade streak
   Cyan ›    Magenta ›    Black ›    Yellow-green ›    Green-yellow ›   
2-6-1. Horizontal lines repeating every 1.6 inches (41 mm)
    Cyan ›     Magenta ›     Black ›   
    Yellowgreen   - Green portion ›   Whole page ›
    Greenyellow   - Green portion ›   Whole page ›
2-6-2. Horizontal lines repeating every 1.9 inches (47 mm)
    Cyan ›     Magenta ›     Black ›   
    Yellowgreen   - Green portion ›   Whole page ›
    Greenyellow   - Green portion ›   Whole page ›
2-7. Partial missing color plane
    Cyan ›     Magenta ›     Black ›   
    Yellowgreen  - Missing yellow ›  Missing cyan ›
    Greenyellow  - Missing yellow ›  Missing cyan ›
2-8. Backside 71.5mm repetitive defect
    Cyan ›     Magenta ›     Black ›    Yellow-green ›    Green-yellow ›   


3. Other print quality issues

3-1. Motting ›
3-2. While halos ›
3-3. Blister on coated media ›
3-4. Misaligned CPR bar (text with shadows or halos) ›
3-5. Other issues repeating at various intervals ›

5. Try other resources ›

Procedures


P1. Print the PQ troubleshooting pages ›
P2. Print the diagnostics pages ›
P3. Setup environment ›
P4. Setup cleaning frequency ›
P5. Calibrate the printer ›
P6. Change media ›
P7. Setup page procedure ›
P8. Print Solid Blue Test Pages ›
P9. Print Halo Test Pages ›
P10. Setting Color Settings to 4-Color
  Solid Blue Test Pages ›   Halo Test Pages ›
P11. Steps for cleaning ITB unit ›
P12. Steps for replacing ITB unit ›
P13. Steps for checking the bushings of the ITB unit ›
P14. Steps for replacing roller kit ›
P15. Steps for check the supplies ›
P16. Steps for reinstall all the image drums ›
P17. Steps for replacing image drums
  Cyan ID ›   Magenta ID›   Yellow ID ›   Black ID ›
P18. Steps for replacing toner cartridges
  Cyan ›   Magenta ›   Yellow ›   Black ›
P19. Steps for check the toner cartridge
  Check the pins ›   Check the gate ›
P20. Steps for check the image drums
  Check the gate ›


Overlay helps

H1. Print cartridges
  Cyan ›   Magenta ›   Yellow ›   Black ›
H2. Image drums
  Cyan ›   Magenta ›   Yellow ›   Black ›
H3. ITB unit ›
H4. Roller Kit ›
H5. Fuser ›
H6. Bushings of ITN unit ›
H7. Cam of print cartridge ›
H8. Gate of print cartridge ›
H9. Pin of print cartridge ›
H10. Tab of print cartridge ›
H11. Gate of image drum ›
H12. Seal of image drum ›
H13. Paper Tray ›
H14. CPR Bars ›
H15. Misaligned CPR Bars ›