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Make/Model Information:

  • Brand:   Hewlett-packard
  • Models included:
    • HP Color LaserJet 2550

File Information:

  • Type:   Factory Service Manual (FSM)
  • Language:   English
  • Number of pages:   312
  • File size:  ∼ 10.75  MB
  • File Format:   PDF only
  • SME Watermarks:   None
  • Password lock:   No
  • Edit/copy/modify:   Yes
  • SKU:   BMHP-1004

NOTE:  This list was created by program script and may not accurately represent the text from the source pages.   For full preview please click on 'Download sample':

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hp color LaserJet
2550 printer service
Table of contents
1 Product information
Chapter contents
Printer configurations
HP color LaserJet 2550L
HP color LaserJet 2550Ln
HP color LaserJet 2550n
Printer features
Printer overview
Hardware components
Model and serial numbers
Software components
Software and supported operating systems
Software tips
Software for Windows
Software for Macintosh
Uninstalling the printing software
Specifications
Media specifications
Supported media weights and sizes
General guidelines
Paper and print media
Printing and storage environment
Envelopes
Labels
Transparencies
Hewlett-Packard limited warranty statement
Limited warranty for the print cartridges and imaging drum
Print cartridge information
Refilled print cartridges
HP LaserJet printing supplies
HP Printing Supplies Returns and Recycling Program information
Regulatory statements
Safety statements
Laser safety statement
Canadian DOC statement
Korean EMI statement
Finnish laser statement
2 Installation and operation
Chapter contents
Operating environment
Interface ports
Control panel features
Understanding Supplies Status
Understanding Printer Status
ENWW iii
Input trays
Printer output paths
Top output bin
Rear output door
Loading media
Loading tray 1
Loading optional tray 2
Loading optional tray 3
HP LaserJet Toolbox
Supported operating systems
Supported browsers
Viewing the HP LaserJet Toolbox
Status tab
Troubleshooting tab
Alerts tab
Documentation tab
Device Settings window
Other links
3 Maintenance
Chapter contents
Life expectancies of supplies
User-replaceable parts
Replacing the tray 1 pickup roller and separation pad
Replacing the separation pad in optional tray 2 or in optional tray 3
Cleaning the printer
Cleaning the printer
Calibrating the printer
To calibrate the printer at the printer
To calibrate the printer from the HP LaserJet Toolbox
Managing supplies
Supplies life
Checking and ordering supplies
Storing supplies
Replacing and recycling supplies
HP policy for non-HP supplies
HP fraud hotline
4 Theory of operation
Chapter contents
Introduction
Engine control system
Basic sequence of operation
Power-on sequence
Motors and fans
Laser/scanner system
Pickup and feed system
Paper trays
Jam detection
Photosensors and switches
Solenoid and clutches
Printed circuit assemblies
Image-formation system
Image-formation process
Latent-image-formation stage
iv ENWW
Developing stage
Transfer stage
Fusing stage
Print cartridge
Imaging-drum E-label
5 Removal and replacement
Chapter contents
Introduction
Removal and replacement strategy
Electrostatic discharge
User-replaceable parts
Required tools
Before performing service
Pre-service procedures
Parts removal order
Removal and replacement
Imaging drum
Print cartridges
Fuser cover (and fuser)
Right- and left-side covers
Control panel
On-off switch
Interface cover
Formatter assemblies
Fuser motor
Dc controller
Optional tray 2 (250-sheet tray)
Carousel-engagement motor
Front lower cover
Back cover
Top cover
Top door
Air duct and fan
Laser/scanner assembly
Front cover
Density sensor and top-of-page sensor
E-label reader (for imaging-drum E-labels)
Tray 1 (multipurpose tray)
Tray 1 separation pad assembly
Gear assembly
Waste-toner sensor
Rotary-drive assembly
Top plate
Print-cartridge carousel
Aligning the carousel gears
Registration-roller assembly
Toner-catch tray
Transfer-roller plate
Transfer roller
Feed-drive shaft
ECU pan
Sub-high-voltage transformer PCA
High-voltage transformer PCA
Low-voltage PCA
Paper-top sensor
Fuser-wrap sensor
250-sheet feeder pickup roller
500-sheet feeder pickup roller
6 Troubleshooting
Chapter contents
Basic troubleshooting
Clearing jams
Where to look for jams
To clear jams from inside the printer
To clear jams from input areas
To clear jams from output areas
Control panel light messages
Supplies Status lights
Printer Status lights
Solving image-quality problems
Print-quality checklist
Solving image-quality problems (all print jobs)
Solving image-quality problems (color print jobs)
Resolving problems that generated messages
Messages for both Windows and Macintosh
Messages for Windows only
Resolving problems that did not generate messages
Troubleshooting checklist
Checking the network
Solving general printing problems
Solving PostScript (PS) errors
Solving common Macintosh problems
Manually rotating the print-cartridge carousel
Functional checks
Engine test
High-voltage power-supply check
Paper-path check
Service mode functions
Cold reset
NVRAM initializer
Error report
Super NVRAM initialization
Network card cold reset
Using PJL commands
Troubleshooting tools
Demo page
Configuration page
Supplies Status page
Repetitive image defects
General timing charts
Locations of connectors
Dc controller connections
Main wiring diagram
HP LaserJet Toolbox
To view the HP LaserJet Toolbox
7 Parts and diagrams
Chapter contents
vi ENWW
Ordering parts and supplies
Related documentation and software
Supplies
Accessories
Assembly locations (1 of 2)
Assembly locations (2 of 2)
Internal assemblies
PCA assemblies
Alphabetical parts list
Numerical parts list
ENWW vii
viii ENWW
List of tables
Table 1-1. HP color LaserJet 2550 series printer software
Table 1-2. Physical specifications
Table 1-3. Supplies specifications
Table 1-4. Electrical specifications
Table 1-5. Environmental specifications
Table 1-6. Acoustic emissions (HP color LaserJet 2550 series)
Table 1-7. Tray 1 specifications
Table 1-8. Optional tray 2 specifications
Table 1-9. Optional tray 3 specifications
Table 2-1. Input tray configuration
Table 3-1. Life expectancies of supplies
Table 4-1. Basic sequence of operation
Table 4-2. Motors and fans
Table 4-3. Photosensors and switches
Table 4-4. Solenoid
Table 4-5. Clutches
Table 4-6. Printed circuit assemblies
Table 6-1. Basic troubleshooting
Table 6-2. Control panel lights legend
Table 6-3. Supplies Status light messages
Table 6-4. Printer-status light messages
Table 6-5. Attention light messages, unnumbered
Table 6-6. Attention light messages, numbered
Table 6-7. Accessory error light messages
Table 6-8. Service error light messages
Table 6-9. Additional error messages
Table 6-10. Solving general printing problems
Table 6-11. Problems in the Chooser
Table 6-12. Printing Errors
Table 6-13. USB Problems
Table 6-14. Repetitive image defects
Table 7-1. Technical support Web sites
Table 7-2. Accessories
Table 7-3. Covers
Table 7-4. Front frame assembly
Table 7-5. Internal components (1 of 2)
Table 7-6. Internal components (2 of 2)
Table 7-7. Main drive assembly
Table 7-8. Rear frame assembly
Table 7-9. Middle frame assembly
Table 7-10. Rotary assembly
Table 7-11. Power-supply base assembly
Table 7-12. Rotary-drive assembly
Table 7-13. PCA assemblies
Table 7-14. Alphabetical parts list
Table 7-15. Numerical parts list
ENWW ix
List of figures
Figure 1-1. HP color LaserJet 2550 series printer identification label
Figure 2-1. Space required
Figure 2-2. Standard and optional input trays—HP color LaserJet 2550 series
printers
Figure 2-3. Printer output paths
Figure 3-1. Smearing
Figure 3-2. Toner specks
Figure 3-3. Loading the cleaning page in tray 1
Figure 4-1. Cross-section of the printer
Figure 4-2. Engine control system (includes the basic configuration of the printer)
Figure 4-3. Power-on sequence
Figure 4-4. Motors and fans
Figure 4-5. Laser/scanner system
Figure 4-6. Pickup and feed system
Figure 4-7. Optional tray 2 (250-sheet paper tray)
Figure 4-8. Photosensors and switches (1 of 2)
Figure 4-9. Photosensors and switches (2 of 2)
Figure 4-10. Solenoid
Figure 4-11. Clutches
Figure 4-12. Printed circuit assemblies (1 of 2)
Figure 4-13. Printed circuit assemblies (2 of 2)
Figure 4-14. Image-formation system
Figure 4-15. Image-formation process
Figure 4-16. Step 1: primary charging
Figure 4-17. Step 2: laser-beam exposure
Figure 4-18. Developing block
Figure 4-19. Step 3: developing
Figure 4-20. Step 4: primary transfer
Figure 4-21. Step 5: secondary transfer
Figure 4-22. Step 6: separation
Figure 4-23. Step 7: fusing
Figure 4-24. Step 8: roller charging (auxiliary transfer belt cleaning roller)
Figure 4-25. Step 9: roller charging (transfer belt cleaning roller)
Figure 4-26. Step 10: transfer belt cleaning
Figure 4-27. Step 11: drum cleaning
Figure 4-28. Print cartridge
Figure 4-29. Print-cartridge E-label
Figure 5-1. Removing the fuser cover (and fuser)
Figure 5-2. Removing the right-side cover (1 of 2)
Figure 5-3. Removing the right-side cover (2 of 2)
Figure 5-4. Removing the control panel (1 of 2)
Figure 5-5. Removing the control panel (2 of 2)
Figure 5-6. Removing the on-off switch
Figure 5-7. Removing the interface cover
Figure 5-8. Removing the formatter cage (1 of 2)
Figure 5-9. Removing the formatter cage (2 of 2)
ENWW xi
Figure 5-10. Removing the formatter (1 of 2)
Figure 5-11. Removing the formatter (2 of 2)
Figure 5-12. Removing the network card
Figure 5-13. Removing the fuser motor
Figure 5-14. Removing the dc controller
Figure 5-15. Removing optional tray 2 (1 of 2)
Figure 5-16. Removing optional tray 2 (2 of 2)
Figure 5-17. Removing the carousel-engagement motor
Figure 5-18. Removing the front lower cover
Figure 5-19. Removing the back cover
Figure 5-20. Removing the top cover (1 of 2)
Figure 5-21. Removing the top cover (2 of 2)
Figure 5-22. Removing the top door (1 of 2)
Figure 5-23. Removing the top door (2 of 2)
Figure 5-24. Removing the air duct
Figure 5-25. Removing the laser/scanner assembly
Figure 5-26. Reinstalling the top output bin cover
Figure 5-27. Removing the front cover
Figure 5-28. Removing the density sensor cover
Figure 5-29. Removing the density sensor
Figure 5-30. Removing the E-label reader (1 of 2)
Figure 5-31. Removing the E-label reader (2 of 2)
Figure 5-32. Removing tray 1 (1 of 2)
Figure 5-33. Removing tray 1 (2 of 2)
Figure 5-34. Removing the tray 1 separation pad assembly
Figure 5-35. Removing the gear assembly (1 of 2)
Figure 5-36. Removing the gear assembly (2 of 2)
Figure 5-37. Removing the waste-toner sensor
Figure 5-38. Removing the rotary-drive assembly (1 of 3)
Figure 5-39. Removing the rotary-drive assembly (2 of 3)
Figure 5-40. Removing the rotary-drive assembly (3 of 3)
Figure 5-41. Removing the top plate (1 of 3)
Figure 5-42. Removing the top plate (2 of 3)
Figure 5-43. Reinstalling the grounding plate
Figure 5-44. Removing the top plate (3 of 3)
Figure 5-45. Removing the print-cartridge carousel (1 of 3)
Figure 5-46. Removing the print-cartridge carousel (2 of 3)
Figure 5-47. Removing the print-cartridge carousel (3 of 3)
Figure 5-48. Reinstalling the print-cartridge carousel
Figure 5-49. Removing the registration-roller assembly
Figure 5-50. Removing the toner-catch tray
Figure 5-51. Removing the transfer-roller plate
Figure 5-52. Removing the transfer roller
Figure 5-53. Removing the feed-drive shaft
Figure 5-54. Removing the ECU pan (1 of 2)
Figure 5-55. Removing the ECU pan (2 of 2)
Figure 5-56. ECU connections
Figure 5-57. Removing the sub-high-voltage transformer PCA
Figure 5-58. Removing the high-voltage transformer PCA
Figure 5-59. Removing the low-voltage PCA (1 of 2)
Figure 5-60. Removing the low-voltage PCA (2 of 2)
Figure 5-61. Removing the paper-top sensor
Figure 5-62. Removing the fuser wrap sensor
Figure 5-63. Removing the 250-sheet feeder pickup roller
Figure 5-64. Removing the 500-sheet feeder pickup roller (1 of 2)
Figure 5-65. Removing the 500-sheet feeder pickup roller (2 of 2)
xii ENWW
Figure 6-1. Control panel lights
Figure 6-2. Manually rotating the print-cartridge carousel
Figure 6-3. Location of the engine-test switch
Figure 6-4. Print cartridge high-voltage connection points
Figure 6-5. Overriding SW301 and the laser/scanner switch
Figure 6-6. General timing chart--WAIT period
Figure 6-7. General timing chart--one page, full-color, normal speed
Figure 6-8. Locations of printer connectors (1 of 3)
Figure 6-9. Locations of printer connectors (2 of 3)
Figure 6-10. Locations of printer connectors (3 of 3)
Figure 6-11. Locations of 250-sheet tray connectors
Figure 6-12. Locations of 500-sheet tray connectors
Figure 6-13. Dc controller connections
Figure 6-14. Main wiring (1 of 2)
Figure 6-15. Main wiring (2 of 2)
Figure 7-1. Covers
Figure 7-2. Front frame assembly
Figure 7-3. Internal components (1 of 2)
Figure 7-4. Internal components (2 of 2)
Figure 7-5. Main drive assembly
Figure 7-6. Rear frame assembly
Figure 7-7. Middle frame assembly
Figure 7-8. Rotary (carousel) assembly
Figure 7-9. Power-supply base assembly
Figure 7-10. Rotary-drive assembly
Figure 7-11. PCA assemblies
ENWW xiii
hp color LaserJet
2500 series service


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