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hp color LaserJet
2550 printer
service
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hp color LaserJet 2550 series printer
Service Manual
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Copyright information
© 2004 Copyright Hewlett-Packard
Development Company, L.P.
Reproduction, adaptation, or translation
without prior written permission is
prohibited, except as allowed under the
copyright laws.
The information contained herein is subject
to change without notice.
The only warranties for HP products and
services are set forth in the express
warranty statements accompanying such
products and services. Nothing herein
should be construed as constituting an
additional warranty. HP shall not be liable
for technical or editorial errors or omissions
contained herein.
Part number Q3702-90923
Edition 1, 5/2004
Safety information
WARNING!
Potential Shock Hazard
Always follow basic safety precautions
when using this product to reduce risk of
injury from fire or electric shock.
Read and understand all instructions in the
user guide.
Observe all warnings and instructions
marked on the product.
Use only a grounded electrical outlet when
connecting the printer to a power source. If
you do not know whether the outlet is
grounded, check with a qualified electrician.
Do not touch the contacts on the end of
any of the sockets on the printer. Replace
damaged cords immediately.
Unplug this product from wall outlets before
cleaning.
Do not install or use this product near water
or when you are wet.
Install the product securely on a stable
surface.
Install the product in a protected location
where no one can step on or trip over the
power cord and where the power cord will
not be damaged.
If the product does not operate normally,
see the online user guide.
Refer all servicing questions to qualified
personnel.
Information regarding FCC Class B, Parts
15 and 68 requirements can be found in
the user guide.
Trademark credits
Adobe®, Acrobat®, Adobe® PostScript®
3™, and the Acrobat Logo® are
trademarks of Adobe Systems Incorporated.
Microsoft®, Windows®, and Windows NT®
are U.S. registered trademarks of Microsoft
Corporation.
UNIX® is a registered trademark of The
Open Group.
Energy Star® and the Energy Star logo®
are U.S. registered marks of the United
States Environmental Protection Agency.
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Table of contents
1 Product information
Chapter contents .......................................................................................................................1
Printer configurations ................................................................................................................2
HP color LaserJet 2550L ....................................................................................................2
HP color LaserJet 2550Ln ..................................................................................................2
HP color LaserJet 2550n ....................................................................................................3
Printer features ..........................................................................................................................4
Printer overview..........................................................................................................................7
Hardware components........................................................................................................7
Model and serial numbers ..................................................................................................7
Software components ...............................................................................................................9
Software and supported operating systems .......................................................................9
Software tips .....................................................................................................................10
Software for Windows .......................................................................................................11
Software for Macintosh .....................................................................................................12
Uninstalling the printing software .....................................................................................13
Specifications ..........................................................................................................................15
Media specifications ................................................................................................................17
Supported media weights and sizes .................................................................................17
General guidelines ............................................................................................................18
Paper and print media ......................................................................................................19
Printing and storage environment ....................................................................................19
Envelopes .........................................................................................................................20
Labels ...............................................................................................................................21
Transparencies .................................................................................................................2 2
Hewlett-Packard limited warranty statement ..........................................................................23
Limited warranty for the print cartridges and imaging drum ...................................................24
Print cartridge information .......................................................................................................25
Refilled print cartridges .....................................................................................................25
HP LaserJet printing supplies ..........................................................................................25
HP Printing Supplies Returns and Recycling Program information..................................25
Regulatory statements ............................................................................................................27
Safety statements ...................................................................................................................28
Laser safety statement .....................................................................................................28
Canadian DOC statement ................................................................................................28
Korean EMI statement ......................................................................................................28
Finnish laser statement ....................................................................................................29
2 Installation and operation
Chapter contents .....................................................................................................................31
Operating environment ............................................................................................................32
Interface ports .........................................................................................................................33
Control panel features .............................................................................................................34
Understanding Supplies Status ........................................................................................34
Understanding Printer Status ...........................................................................................35
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Input trays ................................................................................................................................37
Printer output paths .................................................................................................................38
Top output bin ...................................................................................................................38
Rear output door ...............................................................................................................38
Loading media .........................................................................................................................39
Loading tray 1 ...................................................................................................................39
Loading optional tray 2 .....................................................................................................40
Loading optional tray 3 .....................................................................................................42
HP LaserJet Toolbox ...............................................................................................................44
Supported operating systems ...........................................................................................44
Supported browsers .........................................................................................................44
Viewing the HP LaserJet Toolbox ...................................................................................45
Status tab ..........................................................................................................................45
Troubleshooting tab ..........................................................................................................45
Alerts tab ...........................................................................................................................46
Documentation tab ...........................................................................................................46
Device Settings window ....................................................................................................47
Other links .........................................................................................................................48
3 Maintenance
Chapter contents .....................................................................................................................49
Life expectancies of supplies ..................................................................................................50
User-replaceable parts ............................................................................................................52
Replacing the tray 1 pickup roller and separation pad .....................................................52
Replacing the separation pad in optional tray 2 or in optional tray 3 ...............................57
Cleaning the printer .................................................................................................................61
Cleaning the printer ..........................................................................................................61
Calibrating the printer ..............................................................................................................63
To calibrate the printer at the printer ................................................................................63
To calibrate the printer from the HP LaserJet Toolbox ....................................................63
Managing supplies ..................................................................................................................64
Supplies life ......................................................................................................................64
Checking and ordering supplies .......................................................................................64
Storing supplies ................................................................................................................65
Replacing and recycling supplies .....................................................................................65
HP policy for non-HP supplies ..........................................................................................66
HP fraud hotline ................................................................................................................66
4 Theory of operation
Chapter contents .....................................................................................................................67
Introduction ..............................................................................................................................68
Engine control system .............................................................................................................70
Basic sequence of operation ............................................................................................70
Power-on sequence ..........................................................................................................72
Motors and fans ................................................................................................................7 3
Laser/scanner system .............................................................................................................74
Pickup and feed system ..........................................................................................................75
Paper trays .......................................................................................................................76
Jam detection ...................................................................................................................77
Photosensors and switches ..............................................................................................78
Solenoid and clutches ......................................................................................................80
Printed circuit assemblies .................................................................................................82
Image-formation system ..........................................................................................................84
Image-formation process ..................................................................................................85
Latent-image-formation stage ..........................................................................................85
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Developing stage ..............................................................................................................86
Transfer stage ...................................................................................................................87
Fusing stage .....................................................................................................................89
Print cartridge ...................................................................................................................93
Imaging-drum E-label .......................................................................................................94
5 Removal and replacement
Chapter contents .....................................................................................................................97
Introduction ..............................................................................................................................99
Removal and replacement strategy ..................................................................................99
Electrostatic discharge .....................................................................................................99
User-replaceable parts .....................................................................................................99
Required tools ...................................................................................................................99
Before performing service .....................................................................................................101
Pre-service procedures ..................................................................................................101
Parts removal order ........................................................................................................102
Removal and replacement ....................................................................................................103
Imaging drum ..................................................................................................................103
Print cartridges ................................................................................................................103
Fuser cover (and fuser) ..................................................................................................104
Right- and left-side covers ..............................................................................................106
Control panel ..................................................................................................................107
On-off switch ...................................................................................................................109
Interface cover ................................................................................................................110
Formatter assemblies .....................................................................................................111
Fuser motor ....................................................................................................................116
Dc controller ....................................................................................................................117
Optional tray 2 (250-sheet tray) ......................................................................................118
Carousel-engagement motor ..........................................................................................120
Front lower cover ............................................................................................................121
Back cover ......................................................................................................................122
Top cover ........................................................................................................................123
Top door .........................................................................................................................125
Air duct and fan ...............................................................................................................127
Laser/scanner assembly .................................................................................................128
Front cover ......................................................................................................................130
Density sensor and top-of-page sensor .........................................................................130
E-label reader (for imaging-drum E-labels) ....................................................................132
Tray 1 (multipurpose tray) ..............................................................................................133
Tray 1 separation pad assembly ....................................................................................135
Gear assembly ................................................................................................................136
Waste-toner sensor ........................................................................................................138
Rotary-drive assembly ....................................................................................................139
Top plate .........................................................................................................................142
Print-cartridge carousel ..................................................................................................145
Aligning the carousel gears ............................................................................................149
Registration-roller assembly ...........................................................................................150
Toner-catch tray ..............................................................................................................151
Transfer-roller plate ........................................................................................................152
Transfer roller .................................................................................................................152
Feed-drive shaft ..............................................................................................................153
ECU pan .........................................................................................................................154
Sub-high-voltage transformer PCA ................................................................................157
High-voltage transformer PCA .......................................................................................158
Low-voltage PCA ............................................................................................................159
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Paper-top sensor ............................................................................................................160
Fuser-wrap sensor ..........................................................................................................161
250-sheet feeder pickup roller ........................................................................................162
500-sheet feeder pickup roller ........................................................................................163
6 Troubleshooting
Chapter contents....................................................................................................................167
Basic troubleshooting ............................................................................................................169
Clearing jams ........................................................................................................................171
Where to look for jams ....................................................................................................171
To clear jams from inside the printer ..............................................................................171
To clear jams from input areas .......................................................................................172
To clear jams from output areas .....................................................................................174
Control panel light messages ................................................................................................176
Supplies Status lights .....................................................................................................177
Printer Status lights ........................................................................................................182
Solving image-quality problems ............................................................................................190
Print-quality checklist ......................................................................................................190
Solving image-quality problems (all print jobs) ...............................................................190
Solving image-quality problems (color print jobs) ..........................................................200
Resolving problems that generated messages .....................................................................204
Messages for both Windows and Macintosh ..................................................................204
Messages for Windows only ...........................................................................................204
Resolving problems that did not generate messages ...........................................................206
Troubleshooting checklist ...............................................................................................206
Checking the network .....................................................................................................207
Solving general printing problems ..................................................................................207
Solving PostScript (PS) errors ........................................................................................212
Solving common Macintosh problems ............................................................................213
Manually rotating the print-cartridge carousel ................................................................216
Functional checks .................................................................................................................218
Engine test ......................................................................................................................218
High-voltage power-supply check ..................................................................................219
Paper-path check ...........................................................................................................219
Service mode functions .........................................................................................................221
Cold reset .......................................................................................................................221
NVRAM initializer ............................................................................................................221
Error report......................................................................................................................222
Super NVRAM initialization.............................................................................................222
Network card cold reset...................................................................................................222
Using PJL commands .....................................................................................................223
Troubleshooting tools ............................................................................................................225
Demo page .....................................................................................................................225
Configuration page .........................................................................................................225
Supplies Status page ......................................................................................................226
Repetitive image defects ................................................................................................227
General timing charts .....................................................................................................228
Locations of connectors ..................................................................................................230
Dc controller connections ...............................................................................................233
Main wiring diagram .......................................................................................................234
HP LaserJet Toolbox .............................................................................................................236
To view the HP LaserJet Toolbox ..................................................................................236
7 Parts and diagrams
Chapter contents ...................................................................................................................237
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Ordering parts and supplies ..................................................................................................238
Parts ...............................................................................................................................238
Related documentation and software .............................................................................238
Supplies ..........................................................................................................................238
Accessories ...........................................................................................................................239
Assembly locations (1 of 2).............................................................................................241
Assembly locations (2 of 2).............................................................................................242
Covers....................................................................................................................................244
Internal assemblies................................................................................................................246
PCA assemblies.....................................................................................................................268
Alphabetical parts list.............................................................................................................270
Numerical parts list.................................................................................................................278
Index
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List of tables
Table 1-1. HP color LaserJet 2550 series printer software ................................................9
Table 1-2. Physical specifications ....................................................................................15
Table 1-3. Supplies specifications ....................................................................................15
Table 1-4. Electrical specifications ...................................................................................15
Table 1-5. Environmental specifications ..........................................................................16
Table 1-6. Acoustic emissions (HP color LaserJet 2550 series) .....................................16
Table 1-7. Tray 1 specifications .......................................................................................17
Table 1-8. Optional tray 2 specifications ..........................................................................18
Table 1-9. Optional tray 3 specifications ..........................................................................18
Table 2-1. Input tray configuration ....................................................................................37
Table 3-1. Life expectancies of supplies ..........................................................................51
Table 4-1. Basic sequence of operation ...........................................................................70
Table 4-2. Motors and fans...............................................................................................73
Table 4-3. Photosensors and switches.............................................................................79
Table 4-4. Solenoid...........................................................................................................80
Table 4-5. Clutches...........................................................................................................81
Table 4-6. Printed circuit assemblies................................................................................83
Table 6-1. Basic troubleshooting ....................................................................................169
Table 6-2. Control panel lights legend ...........................................................................176
Table 6-3. Supplies Status light messages ....................................................................177
Table 6-4. Printer-status light messages ........................................................................182
Table 6-5. Attention light messages, unnumbered.........................................................184
Table 6-6. Attention light messages, numbered..............................................................185
Table 6-7. Accessory error light messages.....................................................................186
Table 6-8. Service error light messages.........................................................................186
Table 6-9. Additional error messages.............................................................................189
Table 6-10. Solving general printing problems .................................................................207
Table 6-11. Problems in the Chooser ..............................................................................213
Table 6-12. Printing Errors ...............................................................................................214
Table 6-13. USB Problems ...............................................................................................215
Table 6-14. Repetitive image defects................................................................................227
Table 7-1. Technical support Web sites .........................................................................238
Table 7-2. Accessories ...................................................................................................239
Table 7-3. Covers ...........................................................................................................245
Table 7-4. Front frame assembly ...................................................................................247
Table 7-5. Internal components (1 of 2) .........................................................................251
Table 7-6. Internal components (2 of 2) .........................................................................253
Table 7-7. Main drive assembly......................................................................................255
Table 7-8. Rear frame assembly ....................................................................................257
Table 7-9. Middle frame assembly .................................................................................259
Table 7-10. Rotary assembly ...........................................................................................263
Table 7-11. Power-supply base assembly .......................................................................265
Table 7-12. Rotary-drive assembly ..................................................................................267
Table 7-13. PCA assemblies ............................................................................................269
Table 7-14. Alphabetical parts list.....................................................................................270
Table 7-15. Numerical parts list.........................................................................................278
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List of figures
Figure 1-1. HP color LaserJet 2550 series printer identification label .................................8
Figure 2-1. Space required ................................................................................................32
Figure 2-2. Standard and optional input trays—HP color LaserJet 2550 series
printers ............................................................................................................37
Figure 2-3. Printer output paths .........................................................................................38
Figure 3-1. Smearing..........................................................................................................61
Figure 3-2. Toner specks ...................................................................................................61
Figure 3-3. Loading the cleaning page in tray 1 ................................................................62
Figure 4-1. Cross-section of the printer .............................................................................68
Figure 4-2. Engine control system (includes the basic configuration of the printer) .........70
Figure 4-3. Power-on sequence ........................................................................................72
Figure 4-4. Motors and fans...............................................................................................73
Figure 4-5. Laser/scanner system .....................................................................................74
Figure 4-6. Pickup and feed system ..................................................................................76
Figure 4-7. Optional tray 2 (250-sheet paper tray) ............................................................77
Figure 4-8. Photosensors and switches (1 of 2) ................................................................78
Figure 4-9. Photosensors and switches (2 of 2).................................................................79
Figure 4-10. Solenoid ..........................................................................................................80
Figure 4-11. Clutches ..........................................................................................................81
Figure 4-12. Printed circuit assemblies (1 of 2) ...................................................................82
Figure 4-13. Printed circuit assemblies (2 of 2) ...................................................................83
Figure 4-14. Image-formation system ..................................................................................84
Figure 4-15. Image-formation process ................................................................................85
Figure 4-16. Step 1: primary charging .................................................................................86
Figure 4-17. Step 2: laser-beam exposure ..........................................................................86
Figure 4-18. Developing block .............................................................................................87
Figure 4-19. Step 3: developing ..........................................................................................87
Figure 4-20. Step 4: primary transfer ...................................................................................88
Figure 4-21. Step 5: secondary transfer ..............................................................................89
Figure 4-22. Step 6: separation ...........................................................................................89
Figure 4-23. Step 7: fusing ..................................................................................................90
Figure 4-24. Step 8: roller charging (auxiliary transfer belt cleaning roller) ........................90
Figure 4-25. Step 9: roller charging (transfer belt cleaning roller) .......................................91
Figure 4-26. Step 10: transfer belt cleaning ........................................................................92
Figure 4-27. Step 11: drum cleaning ...................................................................................93
Figure 4-28. Print cartridge ..................................................................................................94
Figure 4-29. Print-cartridge E-label .....................................................................................95
Figure 5-1. Removing the fuser cover (and fuser) ..........................................................105
Figure 5-2. Removing the right-side cover (1 of 2) ..........................................................106
Figure 5-3. Removing the right-side cover (2 of 2) ..........................................................107
Figure 5-4. Removing the control panel (1 of 2) ..............................................................108
Figure 5-5. Removing the control panel (2 of 2) ..............................................................109
Figure 5-6. Removing the on-off switch ...........................................................................110
Figure 5-7. Removing the interface cover .......................................................................111
Figure 5-8. Removing the formatter cage (1 of 2) ...........................................................112
Figure 5-9. Removing the formatter cage (2 of 2) ...........................................................113
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Figure 5-10. Removing the formatter (1 of 2) ....................................................................114
Figure 5-11. Removing the formatter (2 of 2) ....................................................................115
Figure 5-12. Removing the network card...........................................................................116
Figure 5-13. Removing the fuser motor .............................................................................117
Figure 5-14. Removing the dc controller ...........................................................................118
Figure 5-15. Removing optional tray 2 (1 of 2) ..................................................................119
Figure 5-16. Removing optional tray 2 (2 of 2) ..................................................................120
Figure 5-17. Removing the carousel-engagement motor ..................................................121
Figure 5-18. Removing the front lower cover ....................................................................122
Figure 5-19. Removing the back cover .............................................................................123
Figure 5-20. Removing the top cover (1 of 2) ....................................................................124
Figure 5-21. Removing the top cover (2 of 2) ....................................................................125
Figure 5-22. Removing the top door (1 of 2) .....................................................................126
Figure 5-23. Removing the top door (2 of 2) .....................................................................127
Figure 5-24. Removing the air duct ...................................................................................128
Figure 5-25. Removing the laser/scanner assembly .........................................................129
Figure 5-26. Reinstalling the top output bin cover .............................................................129
Figure 5-27. Removing the front cover ..............................................................................130
Figure 5-28. Removing the density sensor cover ..............................................................131
Figure 5-29. Removing the density sensor ........................................................................131
Figure 5-30. Removing the E-label reader (1 of 2) ............................................................132
Figure 5-31. Removing the E-label reader (2 of 2) ............................................................133
Figure 5-32. Removing tray 1 (1 of 2) ................................................................................134
Figure 5-33. Removing tray 1 (2 of 2) ................................................................................135
Figure 5-34. Removing the tray 1 separation pad assembly .............................................136
Figure 5-35. Removing the gear assembly (1 of 2) ...........................................................137
Figure 5-36. Removing the gear assembly (2 of 2) ...........................................................138
Figure 5-37. Removing the waste-toner sensor ................................................................139
Figure 5-38. Removing the rotary-drive assembly (1 of 3) ................................................140
Figure 5-39. Removing the rotary-drive assembly (2 of 3) ................................................141
Figure 5-40. Removing the rotary-drive assembly (3 of 3) ................................................142
Figure 5-41. Removing the top plate (1 of 3) .....................................................................143
Figure 5-42. Removing the top plate (2 of 3) .....................................................................144
Figure 5-43. Reinstalling the grounding plate.....................................................................144
Figure 5-44. Removing the top plate (3 of 3) .....................................................................145
Figure 5-45. Removing the print-cartridge carousel (1 of 3) .............................................146
Figure 5-46. Removing the print-cartridge carousel (2 of 3) .............................................147
Figure 5-47. Removing the print-cartridge carousel (3 of 3) .............................................148
Figure 5-48. Reinstalling the print-cartridge carousel .......................................................150
Figure 5-49. Removing the registration-roller assembly ...................................................151
Figure 5-50. Removing the toner-catch tray ......................................................................151
Figure 5-51. Removing the transfer-roller plate .................................................................152
Figure 5-52. Removing the transfer roller ..........................................................................153
Figure 5-53. Removing the feed-drive shaft ......................................................................154
Figure 5-54. Removing the ECU pan (1 of 2) ....................................................................155
Figure 5-55. Removing the ECU pan (2 of 2) ....................................................................156
Figure 5-56. ECU connections ..........................................................................................156
Figure 5-57. Removing the sub-high-voltage transformer PCA ........................................157
Figure 5-58. Removing the high-voltage transformer PCA ...............................................158
Figure 5-59. Removing the low-voltage PCA (1 of 2) ........................................................159
Figure 5-60. Removing the low-voltage PCA (2 of 2) ........................................................160
Figure 5-61. Removing the paper-top sensor ....................................................................161
Figure 5-62. Removing the fuser wrap sensor ..................................................................162
Figure 5-63. Removing the 250-sheet feeder pickup roller ...............................................163
Figure 5-64. Removing the 500-sheet feeder pickup roller (1 of 2) ..................................164
Figure 5-65. Removing the 500-sheet feeder pickup roller (2 of 2) ..................................165
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Figure 6-1. Control panel lights .......................................................................................176
Figure 6-2. Manually rotating the print-cartridge carousel ...............................................217
Figure 6-3. Location of the engine-test switch .................................................................218
Figure 6-4. Print cartridge high-voltage connection points ..............................................219
Figure 6-5. Overriding SW301 and the laser/scanner switch ..........................................220
Figure 6-6. General timing chart--WAIT period ...............................................................228
Figure 6-7. General timing chart--one page, full-color, normal speed ............................229
Figure 6-8. Locations of printer connectors (1 of 3) ........................................................230
Figure 6-9. Locations of printer connectors (2 of 3) ........................................................231
Figure 6-10. Locations of printer connectors (3 of 3) ........................................................231
Figure 6-11. Locations of 250-sheet tray connectors ........................................................232
Figure 6-12. Locations of 500-sheet tray connectors ........................................................232
Figure 6-13. Dc controller connections ..............................................................................233
Figure 6-14. Main wiring (1 of 2) ........................................................................................234
Figure 6-15. Main wiring (2 of 2) ........................................................................................235
Figure 7-1. Covers............................................................................................................244
Figure 7-2. Front frame assembly ...................................................................................246
Figure 7-3. Internal components (1 of 2)..........................................................................250
Figure 7-4. Internal components (2 of 2) .........................................................................252
Figure 7-5. Main drive assembly .....................................................................................254
Figure 7-6. Rear frame assembly ....................................................................................256
Figure 7-7. Middle frame assembly .................................................................................258
Figure 7-8. Rotary (carousel) assembly ..........................................................................262
Figure 7-9. Power-supply base assembly .......................................................................264
Figure 7-10. Rotary-drive assembly ..................................................................................266
Figure 7-11. PCA assemblies ............................................................................................268
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Product information
1
Chapter contents
Chapter contents .......................................................................................................................1
Printer configurations ................................................................................................................2
HP color LaserJet 2550L ....................................................................................................2
HP color LaserJet 2550Ln ..................................................................................................2
HP color LaserJet 2550n ....................................................................................................3
Printer features ..........................................................................................................................4
Printer overview..........................................................................................................................7
Hardware components........................................................................................................7
Model and serial numbers ..................................................................................................7
Software components ...............................................................................................................9
Software and supported operating systems .......................................................................9
Software tips .....................................................................................................................10
Software for Windows .......................................................................................................11
Software for Macintosh .....................................................................................................12
Uninstalling the printing software .....................................................................................13
Specifications ..........................................................................................................................15
Media specifications ................................................................................................................17
Supported media weights and sizes .................................................................................17
General guidelines ............................................................................................................18
Paper and print media ......................................................................................................19
Printing and storage environment ....................................................................................19
Envelopes .........................................................................................................................20
Labels ...............................................................................................................................21
Transparencies .................................................................................................................2 2
Hewlett-Packard limited warranty statement ..........................................................................23
Limited warranty for the print cartridges and imaging drum ...................................................24
Print cartridge information .......................................................................................................25
Refilled print cartridges .....................................................................................................25
HP LaserJet printing supplies ..........................................................................................25
HP Printing Supplies Returns and Recycling Program information..................................25
Regulatory statements ............................................................................................................27
Safety statements ...................................................................................................................28
Laser safety statement .....................................................................................................28
Canadian DOC statement ................................................................................................28
Korean EMI statement ......................................................................................................28
Finnish laser statement ....................................................................................................29
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Printer configurations
Thank you for purchasing the HP color LaserJet 2550 series printer. The printer is available
in the following configurations.
HP color LaserJet 2550L
The HP color LaserJet 2550L printer is a four-color laser printer that prints letter-size pages
up to 20 pages per minute (ppm) in black and white, A4-size pages up to 19 ppm, and it
prints letter/A4-size pages at 4 ppm in color. It includes a PCL 6 printer driver and has
PostScript
● Trays. The printer comes with a multipurpose tray (tray 1) that holds up to 125 sheets of
®
level 3 emulation.
various print media or 10 envelopes. The printer can also accept an optional 250-sheet
tray (tray 2) for standard sizes and optional 500-sheet tray (tray 3) for A4 and letter
sizes. (Optional tray 2 must be installed in order to install optional tray 3.) See
media weights and sizes for more information.
Supported
● Print cartridges. This model comes standard with color print cartridges (cyan, yellow,
and magenta) that can print up to 2,000 pages at 5 percent coverage. It comes with a
black print cartridge that can print up to 5,000 pages at 5 percent coverage. (A typical
business letter has 5 percent coverage.)
● Connectivity. The printer provides parallel and universal serial bus (USB) ports for
connectivity. The printer also accepts an optional HP Jetdirect external print server for
connecting to a network.
●
Memory. The printer comes standard with 64 MB RAM.
● Expandability. The printer has one available DIMM slot for memory expansion and
additional font support. The memory is expandable to 192 MB by adding a 128-MB DIMM.
HP color LaserJet 2550Ln
The HP color LaserJet 2550Ln printer has the same features as the HP color LaserJet
2550L printer, except it includes an HP Jetdirect internal print server for connecting to a
10/100Base-T network. This model also accepts optional tray 2 and optional tray 3. (Optional
tray 2 must be installed in order to install optional tray 3.)
2 Chapter 1 Product information ENWW
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HP color LaserJet 2550n
The HP color LaserJet 2550n printer has the same features as the HP color LaserJet
2550Ln printer and also includes tray 2. This model also accepts optional tray 3. This model
comes standard with high-capacity color print cartridges that can print up to 4,000 pages.
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Printer features
Feature HP color LaserJet 2550 series printer
Color printing ● Provides laser printing in full color by using
the four process colors: cyan, magenta,
yellow, and black (CMYK).
Fast print speed
Excellent print quality
Ease of use ● Few supplies to order. Supplies are easy to
Expandability ● Optional tray 2. (Included with the 2550n
● Prints in black on letter-size paper up to 20
ppm and on A4-size paper up to 19 ppm.
Prints in color on A4/letter at 4 ppm.
● ImageREt 2400 provides 2400 dpi (dots per
inch) color and laser-class quality through a
multilevel printing process.
● True 600 x 600 dpi text and graphics.
● Adjustable settings to optimize print quality.
● The HP UltraPrecise print cartridge has a
finer toner formulation that provides sharper
text and graphics.
install.
● Convenient access to printer information
and settings by using the HP LaserJet
Toolbox software.
● Convenient access to all supplies and to the
paper path through the front door.
model; compatible with all other models.)
This 250-sheet tray for standard sizes
reduces how often you have to add paper to
the printer. Only one 250-sheet tray can be
installed on the printer.
● Optional tray 3. This 500-sheet tray for letter
and A4 sizes reduces how often you have to
add paper to the printer. Only one 500-sheet
tray can be installed on the printer. Optional
tray 2 must be installed in order to install
optional tray 3.
● Optional HP Jetdirect external print server
for connecting to a network (HP color
LaserJet 2550L printer).
● One DIMM slot for adding memory and fonts.
4 Chapter 1 Product information ENWW
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Feature HP color LaserJet 2550 series printer
Flexible paper handling
Printer driver features
● Adjustable tray 1 (multipurpose tray) for
letterhead, envelopes, labels,
transparencies, custom-sized media,
postcards, glossy paper, HP LaserJet
Tough paper, and heavy paper.
● Optional tray 2 (250-sheet tray) that is
adjustable for several standard sizes of
paper.
● Optional tray 3 (500-sheet tray) for letter-
and A4-size paper. (Optional tray 2 must be
installed in order to install optional tray 3.)
● One 125-sheet output bin and one output
door. Select the top output bin (face down)
for most jobs, including transparencies. Use
the rear output door (face up) for jobs on
heavy paper, light paper, or special print
media.
● Straight-through paper path capability from
tray 1 to the rear output door.
● Manual two-sided printing (duplexing). See
Interface cover.
● Fast printing performance, built-in Intellifont
and TrueType scaling technologies, built-in
HP-GL/2 vector graphics, and advanced
imaging capabilities are benefits of the PCL
6 printer language. The PCL 6 also
includes 45 scalable TrueType fonts and
one bitmapped Line Printer Font. The PCL
6 printer language also included.
PostScript® (PS) level 3 emulation language
and fonts
Automatic language-switching ● The printer automatically determines and
Interface connections
● Includes 35 built-in PS language fonts.
switches to the appropriate printer language
(such as PS or PCL 6) for the print job.
● Bidirectional enhanced capabilities port
(ECP) type-B parallel port (IEEE-1284
compliant).
● High-speed USB port.
● Accepts an optional HP Jetdirect external
print server (HP color LaserJet 2550L
printer). The HP color LaserJet 2550Ln and
2550n printers include an HP Jetdirect
internal print server.
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Feature HP color LaserJet 2550 series printer
Networking ● Accepts an optional HP Jetdirect external
print server (HP color LaserJet 2550L
printer). The HP color LaserJet 2550Ln and
2550n printers include an HP Jetdirect
internal print server.
● All common network protocols such as
Ethernet, Token Ring, and LocalTalk are
available by using an optional HP Jetdirect
external print server. (The 2550Ln and
2550n models include an HP Jetdirect
internal print server.)
Enhanced memory and memory expansion ● The printer comes with 64 MB of memory
and can be expanded to 192 MB by using
the DIMM slot. Most documents can be
printed with the standard amount of printer
memory through the aid of Memory
Enhancement technology (MEt). MEt
automatically compresses data, and almost
doubles the printer memory and
accommodating more complex printing with
available memory.
Energy savings ● The printer automatically conserves
electricity by substantially reducing power
consumption when it is not printing.
● As an ENERGY STAR® partner, Hewlett-
Packard Company has determined that this
product meets ENERGY STAR® guidelines
for energy efficiency. ENERGY STAR® is a
U.S. registered service mark of the United
States Environmental Protection Agency.
Economical printing ● N-up printing (printing more than one page
on a sheet) and two-sided printing using
manual duplexing saves paper. See
a cleaning page and Interface cover.
Supplies ● A Supplies Status page with print cartridge
and imaging drum gauges that show the
supply levels that remain. For HP supplies
only.
● No-shake cartridge design.
● Authentication for HP print cartridges.
● Enabled supplies-ordering capability.
Accessibility ● Online user guide that is compatible with
text screen-readers.
● Print cartridges and the imaging drum can
be installed and removed by using one hand.
● All doors and covers can be opened by
using one hand.
To use
6 Chapter 1 Product information ENWW
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Printer overview
Hardware components
Before using the printer, familiarize yourself with the parts of the printer.
1 Top (face-down) output bin
2 Power switch
3 Optional tray 3
4 Optional tray 2 (included with HP color LaserJet 2550n model)
5 Tray 1
6 Top cover
7 Control panel
7
1
6
5
2
4
3
7
12
8
11
9
10
7 Control panel
8 Interface ports *
9 Optional tray 2
10 Optional tray 3
11 Power connector
12 Rear (face-up) output door
* The interface ports are described in more detail in the next chapter. See Interface ports.
Model and serial numbers
The model number and serial number are listed on an identification label located underneath
the top door.
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The label contains information about the country/region of origin and the revision level,
manufacturing date, production code, and production number of the product. The label also
contains power rating and regulatory information.
Figure 1-1.
HP color LaserJet 2550 series printer identification label
8 Chapter 1 Product information ENWW
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Software components
Software and supported operating systems
For easy printer setup and access to the full range of printer features, HP strongly
recommends that you install the software that is provided. Not all software is available in all
languages. See the HP Color LaserJet 2550 Series Printer Getting Started Guide for
installation instructions, and see the Readme file for the latest software information.
The most recent drivers, additional drivers, and other software are available from the Internet
and other sources. See
The printer supports the following operating systems:
●
Microsoft
Windows XP
●
Windows NT
● Macintosh OS 9.1, 9.2, 9.3, and OS X v.10.1 and later
●
UNIX
The following tables list the software that is available for your operating system.
Table 1-1. HP color LaserJet 2550 series printer software
®
Windows® 98, Windows 2000, Windows Millennium Edition (Me), and
®
, Linux, and OS/2 (limited functionality)
Related documentation and software.
®
4.0 (driver only, other printer software is not available)
Feature Windows
98, Me
Windows
Installer
PCL 6
printer driver
PS printer
driver
HP Web
Jetadmin
software
HP
HP LaserJet
Toolbox
software
Macintosh
Installer
Windows
2000 and
XP
1
Macintosh
OS 9.1,
9.2, and 9.3
Macintosh
OS X v.
10.1 and
later
2
UNIX®,
Linux
OS/2
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Table 1-1. HP color LaserJet 2550 series printer software (continued)
Feature Windows
98, Me
Macintosh
PostScript
printer
description
(PPD) and
printer
dialog
extensions
(PDE)
Windows
2000 and
XP
Macintosh
OS 9.1,
9.2, and 9.3
Macintosh
OS X v.
10.1 and
later
UNIX®,
Linux
OS/2
IBM drivers
Model
scripts
1
Available on the HP Web site.
2
HP LaserJet Toolbox software support for Macintosh OS X, v. 10.2 or later.
3
Available on the HP Web site. Not specific to this printer.
3
1
Software tips
The following are some tips for working with the printer software.
Gaining access to the printer features
The printer features are available in the printer driver. Some features such as custom paper
sizes and page orientation might also be available in the program that was used to create a
file. Change settings in the program, if possible, because changes that are made in the
program override changes that are made in the printer driver.
Obtaining the latest printing software
To check for and install upgrades to the printing software, download drivers from the Internet
or HP’s file transfer protocol (FTP) servers.
To download drivers
1. Go to www.hp.com. Click the support & drivers block.
2.
Type color laserjet 2550 as the product name. The Web page for the drivers
might be in English, but you can download the drivers themselves in several languages.
If Internet access is not available, see the flyer that came in the printer box.) See the
Readme file for additional release information.
Other print system software
See the Readme file that is provided on the HP color LaserJet 2550 CD-ROM for additional,
included software and for supported languages.
10 Chapter 1 Product information ENWW
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Software for Windows
When you install the software for Windows, you can directly connect the printer to a
computer by using a USB or parallel cable or, if your printer is network-enabled, you can
connect the printer to the network by using the HP Jetdirect print server. See the HP Color
LaserJet 2550 Series Printer Getting Started Guide for installation instructions, and see the
Readme file for the latest software information.
The following software is available to all users of the printer, whether you connected the
printer directly to a computer by using a parallel cable or USB cable, or whether you
connected the printer to the network by using an HP Jetdirect print server.
Printer drivers
Select a printer driver based on the way the printer is being used.
● Use the PCL 6 printer driver to take full advantage of the printer features. Unless
complete backward compatibility with previous PCL drivers or older printers is
necessary, the PCL 6 driver is recommended.
● Use the PS printer driver for compatibility with PS needs. Certain printer features are not
available in this printer driver.
The printer automatically switches between PS 3 emulation and PCL printer languages
depending on the driver you have selected.
Using Help
The printer driver has Help dialog boxes that can be activated from the Help button in the
printer driver, the F1 key on the computer keyboard, or the question mark symbol (?) in the
upper-right corner of the printer driver. These Help dialog boxes give detailed information
about the specific printer driver. Help for the printer driver is separate from the Help for your
program.
HP LaserJet Toolbox
You must perform a complete software installation to use the HP LaserJet Toolbox.
The HP LaserJet Toolbox provides links to printer status information and help information,
such as the HP Color LaserJet 2550 Series Printer User Guide; and tools for diagnosing and
solving problems. You can also view explanations and animations of light messages on the
control panel. See
HP LaserJet Toolbox for more information.
Software for network installations only
This software is available only when the printer is connected to a network.
HP Web Jetadmin
HP Web Jetadmin is intended for printer management in commercial and enterprise
networks. While the HP LaserJet Toolbox is used to manage a single printer, HP Web
Jetadmin is used to manage groups of printers and other devices. Download this software
from the HP Web site at http://www.hp.com/go/webjetadmin. The HP Web Jetadmin Web
site provides HP Web Jetadmin software in many languages.
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HP Web Jetadmin is available only if the printer is connected to an Internet protocol- (IP-)
based network. This browser-based software can be installed on one of the following
supported platforms:
● Microsoft Windows 2000 or XP
● Red Hat Linux
● SuSE Linux
Starting HP Web Jetadmin
After you install the HP Web Jetadmin software, you can start it in a supported Web browser
on any computer by typing one of the following Web addresses:
http://server.domain:port/
●
where "server.domain" is the server hostname and "port" is the port number that you
selected during installation. (The default port is 8000.) This information is available in the
url.txt file, which is stored in the folder where HP Web Jetadmin is installed.
http://ipaddress:port/
●
where "ipaddress" is the IP address of the computer on which HP Web Jetadmin is
installed.
For settings that appear in both the printer driver and HP Web Jetadmin, changes that are
made in the printer driver override changes that are made in HP Web Jetadmin.
Software for Macintosh
For Mac 9.1, the Apple LaserWriter 8 driver must be installed to use the PPD file. Use the
Apple LaserWriter 8 driver that came with your Macintosh. For Mac OS X, use Print Center
to print.
The printer includes the following software for Macintosh computers.
PPDs (Mac OS 9.1 and Mac OS X classic)
PPDs, in combination with the LaserWriter driver, provide access to the printer features and
allow the computer to communicate with the printer. An installation program for the PPDs is
provided on the HP color LaserJet 2550 CD-ROM.
PDEs (Mac OS X)
PDEs are code plug-ins that provide access to printer features, such as information about
the number of copies, two-sided printing, and quality settings. An installation program for the
PDEs and other software is provided on the HP color LaserJet 2550 CD-ROM.
HP LaserJet Toolbox
The HP LaserJet Toolbox is supported for Mac OS 10.2 and later. You must perform a
complete software installation to use the HP LaserJet Toolbox.The HP LaserJet Toolbox
provides links to printer status information and help information, such as the HP Color
LaserJet 2550 Series Printer User Guide; and tools for diagnosing and solving problems.
You can also view explanations and animations of light messages on the control panel. See
HP LaserJet Toolbox for more information.
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Uninstalling the printing software
Uninstall software by using the following directions for your operating system.
Uninstalling software for Windows
The printer comes with an uninstall utility that you can use to select and remove any or all of
the Windows HP printing system components from your computer.
To uninstall software for Windows 98 and later
Note
To uninstall the software from Windows 2000 or XP, you must log on with administrator
privileges.
1. Close all of the open programs.
For Windows 98 and Me
a. Press Ctrl+Alt+Delete. The Close Program dialog box opens.
b. Select a program except Explorer or Systray, and then click End Task.
c. Repeat step b until all of the programs except Explorer and Systray are closed.
For Windows 2000 and XP
a. Press Ctrl+Alt+Delete. The Windows Security dialog box opens.
b. Click Task Manager and then click the Applications tab.
c. Select a program, and then click End Task.
d. Repeat step c until all of the programs are closed.
2. On the Start menu, point to Programs, point to Hewlett-Packard, point to HP color
LaserJet 2550 series, and then click Add or Remove.
3. On the Setup screen, click Next.
4. To remove specific software components, click Modify the existing installation. To
remove all the printer software, click Remove All.
Note
Clicking Remove All requires you to have the software CD to complete the uninstallation.
5. Click the drop-down icon next to each feature that you want to remove. From the drop-
down list, click This feature will not be available.
6. Click Next, and follow the directions on the screen. If the message "The following file is
a shared file but is not used by any other programs. Would you like to delete it?"
appears, click Yes to All. The system finishes removing files.
7. If prompted to restart the computer, click OK.
Uninstalling software for Windows by using Add or Remove Programs
An alternate method for uninstalling the printer software is to use the Add or Remove
Programs method. This method does not require you to have the software CD.
1. Click Start, point to Settings, and then click Control Panel.
2. Click Add or Remove Programs.
ENWW Software components 13
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3. Scroll through the list of software programs and then click HP color LaserJet 2550
series printer.
4. Click Remove.
Uninstalling software for Macintosh
To remove the printing software from your Macintosh, drag the HP LaserJet folder and PPDs
to the Trash. If you are using Mac OS X, you must also drag the PDEs to the Trash.
For Mac OS 9.1: The PPDs are located in Macintosh HD\System Folder\Extensions
\Printer Descriptions.
For Mac OS X: The PPDs are located in Macintosh HD\Library\Printers\PPDs
\Contents\Resources\<lang>.lproj. The PDEs are located in Macintosh HD
\Library\Printers\PPD Plugins\HP*.
The phrase <lang> represents the language of the printer software that you selected.
14 Chapter 1 Product information ENWW
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Specifications
Table 1-2. Physical specifications
Product Height Depth Width Weight
HP color
LaserJet 2550L
printer without
optional trays
HP color
LaserJet 2550n
printer with tray 2
(250-sheet)
HP color
LaserJet 2550n
printer with tray 2
and optional tray
3 (500-sheet)
325 mm
(12.80 in)
376 mm
(14.80 in)
512 mm
(20.16 in)
451 mm
(17.76 in)
451 mm
(17.76 in)
451 mm
(17.76 in)
482 mm
(18.98 in)
482 mm
(18.98 in)
482 mm
(18.98 in)
21.5 kg
(47.5 lbs)
23.9 kg
(52.7 lbs)
29.3 kg
(64.6 lbs)
Table 1-3. Supplies specifications
Imaging-drum life (based on 5% coverage) 20,000 pages when printing only in black
5,000 pages when printing in color
6,000 to 8,000 pages is the average life
Print-cartridge life (based on 5% coverage) Black: 5,000 pages
Yellow, cyan, and magenta: 2,000 pages
each
Yellow, cyan, and magenta: 4,000 pages
each (HP extended-life color cartridges)
Table 1-4. Electrical specifications
Item 110-volt models 220-volt models
Power supply 115 to 127 V (+/- 10 %) 220 to 240 V (+/- 10 %)
50 to 60 Hz (+/- 3 Hz) 50 to 60 Hz (+/- 3 Hz)
Power consumption (typical)
During printing (color) 224 W (average) 217 W (average)
During printing (black and
white)
During standby 15 W (average) 18 W (average)
Off mode 0 W (average) 0 W (average)
Heat output
Idle 51 BTU/hr 61 BTU/hr
400 W (average) 403 W (average)
ENWW Specifications 15
Page 32
Table 1-4. Electrical specifications (continued)
Item 110-volt models 220-volt models
CAUTION
Minimum recommended circuit
12 A 6 A
capacity
Power requirements are based on the country/region where the printer is sold. Do not
convert operating voltages. This will damage the printer and void the product warranty.
Table 1-5. Environmental specifications
1
Operating
15° to 32.5°C
(59° to 90.5°F)
(printer and print
cartridge)
Recommended
20° to 27°C
(68° to 81°F)
Temperature
Relative humidity 20% to 70% 10% to 80% 95% or less
1
Values are subject to change. See www.hp.com/support/clj2550 for current information.
1
Storage
1
-20° to 40°C
(-4° to 104°F)
Table 1-6. Acoustic emissions (HP color LaserJet 2550 series)
Sound power
Printing (20 ppm)
Sound Pressure
Declared per ISO 9296
L
= 6.6 Bels (A)
WAd
Declared per ISO 9296
1
1
Operator position (printing at 20 ppm)
Bystander position (printing at 20 ppm)
1
Values are subject to change. See http://www.hp.com/support/clj2550 for current information.
L
= 62 dB(A)
pAm
L
= 52 dB(A)
pAm
16 Chapter 1 Product information ENWW
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Media specifications
This section contains information about the sizes, weights, and capacities of media that each
tray supports.
Supported media weights and sizes
This section contains information about the sizes, weights, and capacities of paper and other
print media that each tray supports.
Table 1-7. Tray 1 specifications
Tray 1
Dimensions
1
Paper Minimum: 76 x 127 mm (3 x
5 inches)
Weight
Capacity
60 to 177 g/m2 (16 to 47 lb) Up to 125 sheets of 75 g/m
(20 lb) paper
2
Maximum: 216 x 356 mm
(8.5 x 14 inches)
Glossy paper Same as the preceding
listed minimum and
HP Cover paper
4
maximum sizes.
Transparencies and
opaque film
3
Labels
75 to 120 g/m2 (20 to 32 lb)
203 g/m2 (75 lb cover)
Thickness: 0.10 to 0.13 mm
(3.9 to 5.1 mils)
Thickness: up to 0.23 mm
Maximum stack height: 12 mm
(0.47 inches)
50 (typically)
50 (typically)
50 (typically)
(up to 9 mils)
Envelopes
1
The printer supports a wide range of standard and custom sizes of print media. Check the printer driver for
Up to 90 g/m2 (16 to 24 lb)
Up to 10
supported sizes.
2
Capacity can vary depending on media weight and thickness, and environmental conditions.
3
Smoothness: 100 to 250 (Sheffield).
4
HP does not guarantee results when printing with other types of heavy paper.
2
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Table 1-8. Optional tray 2 specifications
Optional tray 2 (250-sheet tray)
Dimensions
Letter 216 x 279 mm (8.5 x 11 inches)
1
Weight
60 to 105 g/m
(16 to 28 lb)
Capacity
2
250 sheets of 75
g/m
2
(20 lb) paper
A4 210 x 297 mm (8.3 x 11.7 inches)
A5 148 x 210 mm (5.8 x 8.3 inches)
B5 (ISO) 176 x 250 mm (6.9 x 9.9 inches)
B5 (JIS) 182 x 257 mm (7.2 x 10 inches)
Executive 191 x 267 mm (7.3 x 10.5 inches)
Legal 216 x 356 mm (8.5 x 14 inches)
8.5 x 13 inches 216 x 330 mm (8.5 x 13 inches)
1
The printer supports a wide range of standard and custom sizes of print media. Check the printer driver for
supported sizes.
2
Capacity can vary depending on the media weight and thickness, and environmental conditions.
Table 1-9. Optional tray 3 specifications
Optional tray 3 (500-sheet tray)
Dimensions
Letter 216 x 279 mm (8.5 x 11 inches)
A4 210 x 297 mm (8.3 x 11.7 inches)
1
The printer supports a wide range of standard and custom sizes of print media. Check the printer driver for
1
Weight
60 to 105 g/m
(16 to 28 lb)
Capacity
2
500 sheets of 75g/m
2
(20-lb) paper
supported sizes.
2
Capacity can vary depending on the media weight and thickness, and environmental conditions.
2
2
CAUTION
General guidelines
Some print media might meet all of the guidelines in this manual and still not produce
satisfactory results. This problem might be the result of improper handling, unacceptable
temperature and humidity levels, or other variables over which HP has no control.
Before purchasing large quantities of print media, always test a sample and make sure the
that the print media meets the requirements specified in the HP Color LaserJet 2550 Series
Printer User Guide and in the HP LaserJet Printer Family Print Media Guide. For ordering
information, see
Using print media that does not meet HP specifications can cause problems for the printer,
requiring repair. This repair is not covered by the HP warranty or service agreements.
Ordering parts and supplies.
18 Chapter 1 Product information ENWW
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This printer accepts a variety of media, such as cut-sheet paper (including up to 100%
recycled-fiber-content paper), envelopes, labels, transparencies, glossy paper, HP LaserJet
Tough paper, and custom-size paper. Properties such as weight, composition, grain, and
moisture content are important factors affecting printer performance and output quality. Print
media that does not meet the guidelines outlined in this manual can cause the following
problems:
● Poor print quality
● Increased jams
● Premature wear on the printer, requiring repair
Paper and print media
Category Specifications
Acid content 5.5 pH to 8.0 pH
Caliper 0.094 to 0.18 mm (3.0 to 7.0 mils)
Curl in ream Flat within 5 mm (0.02 inch)
Cut-edge conditions Cut with sharp blades with no visible fray
Fusing compatibility Must not scorch, melt, offset, or release
hazardous emissions when heated to 210°C
(410°F) for 0.1 second
Grain Long Grain
Moisture content 4% to 6% by weight
Smoothness 100 to 250 Sheffield
For complete print-media specifications for all HP LaserJet printers, see the HP LaserJet
Printer Family Print Media Guide. To download the guide in PDF format, go to www.hp.com/
support/ljpaperguide.
Printing and storage environment
Ideally, the printing and media-storage environment should be at or near room temperature,
and not too dry or too humid. Remember that paper is hygroscopic; it absorbs and loses
moisture rapidly.
Heat works with humidity to damage paper. Heat causes the moisture in paper to evaporate,
while cold causes it to condense on the sheets. Heating systems and air conditioners
remove most of the humidity from a room. As paper is opened and used, it loses moisture,
causing streaks and smudging. Humid weather or water coolers can cause the humidity to
increase in a room. As paper is opened and used it absorbs any excess moisture, causing
light print and dropouts. Also, as paper loses and gains moisture it can distort. This issue
can cause jams.
As a result, paper storage and handling are as important as the paper-making process itself.
Paper storage environmental conditions directly affect the feed operation and print quality.
ENWW Media specifications 19
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Care should be taken not to purchase more paper than can be easily used in a short time
(about three months). Paper stored for long periods can experience heat and moisture
extremes, which can cause damage. Planning is important to prevent damage to a large
supply of paper.
Unopened paper in sealed reams can remain stable for several months before use. Opened
packages of paper have more potential for environmental damage, especially if they are not
wrapped with a moisture-proof barrier.
The media-storage environment should be properly maintained to ensure optimum printer
performance. The required condition is 20° to 24°C (68° to 75°F), with a relative humidity of
45% to 55%. The following guidelines should be helpful when evaluating the storage
environment:
● Print media should be stored at or near room temperature.
● The air should not be too dry or too humid (to moderate the hygroscopic properties of
paper).
● The best way to store an opened ream of paper is to rewrap it tightly in its moisture-
proof wrapping. If the printer environment is subject to extremes, unwrap only the
amount of paper to be used to prevent unwanted moisture changes.
● Avoid storing paper and print media near heating and air conditioning vents or near
windows and doors that are frequently open.
Envelopes
Use only tray 1 to print on envelopes. Select the type of envelope that you are using from
the Print dialog box or the printer driver.
In your program, set the margins for the envelope. The following table gives typical address
margins for a commercial #10 or DL envelope.
Type of address Top margin Left margin
Return address 15 mm (0.6 inch) 15 mm (0.6 inch)
Delivery address 51 mm (2 inches) 89 mm (3.5 inches)
● For the best print quality, position margins no closer than 15 mm (0.6 inch) from the
edges of the envelope.
● Avoid printing over the area where the envelope seams meet.
Envelope storage
Proper storage of envelopes helps contribute to print quality. Envelopes should be stored
flat. If air is trapped in an envelope and creates an air bubble, then the envelope might
wrinkle during printing.
For more information, see
Envelope construction
Resetting the printer for non-HP supplies.
20 Chapter 1 Product information ENWW
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Envelope construction is critical. Envelope fold lines can vary considerably, not only between
manufacturers, but also within a box from the same manufacturer. Successful printing on
envelopes depends upon the quality of the envelopes. When selecting envelopes, consider
the following components:
●
Weight: The weight of the envelope paper should not exceed 90 g/m
might occur.
● Construction: Before printing, envelopes should lie flat with less than 6 mm (0.25 inch)
curl, and should not contain air.
● Condition: Envelopes should not be wrinkled, nicked, or otherwise damaged.
● Temperature: Use envelopes that are compatible with the heat and pressure of the
printer. The fusing temperature of this printer is 210°C (410°F).
● Size: Use only envelopes that are within the following size ranges.
● Minimum: 6 x 127 mm (3 x 5 inches)
● Maximum: 216 x 356 mm (8.5 x 14 inches)
Envelopes with double side-seams
Double side-seam construction has vertical seams at both ends of the envelope rather than
diagonal seams. This style might be more likely to wrinkle. Be sure the seam extends all the
way to the corner of the envelope as shown in the illustration.
2
(24 lb) or jamming
CAUTION
1
2
1 acceptable
2 unacceptable
Envelopes with adhesive strips or flaps
Envelopes with a peel-off adhesive strip or with more than one flap that folds over to seal
must use adhesives that are compatible with the heat and pressure in the printer. The extra
flaps and strips might cause wrinkling, creasing, or even jams and might damage the fuser.
Labels
Select the type of label that you are using from the Print dialog box or the printer driver.
To avoid damaging the printer, use only labels that are recommended for laser printers. To
prevent serious jams, always use tray 1 to print on labels and always use the straightthrough paper path. Never print on the same sheet of labels more than once or print on a
partial sheet of labels.
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When selecting labels, consider the quality of each component:
● Adhesives: The adhesive material should be stable at 210°C (410°F), which is the
printer fusing temperature.
● Arrangement: Only use labels with no exposed backing between them. Labels can peel
off sheets with spaces between the labels, causing serious jams.
● Curl: Before printing, labels must lie flat with no more than 13 mm (0.5 inch) of curl in
any direction.
● Condition: Do not use labels that have wrinkles, bubbles, or other indications of
separation.
CAUTION
For more information, see
Imaging drum.
Transparencies
Use only tray 1 to print on transparencies. Select Transparencies from the Print dialog box
or the printer driver.
The printer supports printing in color on transparencies. Transparencies that are used in the
printer must be able to withstand 210°C (410°F), which is the printer fusing temperature.
To avoid damage to the printer, use only transparencies that are recommended for use in
laser printers.
For more information, see
Media specifications.
22 Chapter 1 Product information ENWW
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Hewlett-Packard limited warranty statement
HP PRODUCT
HP color LaserJet 2550L, 2550Ln, 2550n
HP warrants to you, the end-user customer, that HP hardware and accessories will be free from defects in
materials and workmanship after the date of purchase, for the period specified above. If HP receives notice of
such defects during the warranty period, HP will, at its option, either repair or replace products which prove to be
defective. Replacement products may be either new or equivalent in performance to new.
HP warrants to you that HP software will not fail to execute its programming instructions after the date of
purchase, for the period specified above, due to defects in material and workmanship when properly installed and
used. If HP receives notice of such defects during the warranty period, HP will replace software which does not
execute its programming instructions due to such defects.
HP does not warrant that the operation of HP products will be uninterrupted or error free. If HP is unable, within a
reasonable time, to repair or replace any product to a condition as warranted, you will be entitled to a refund of
the purchase price upon prompt return of the product.
HP products may contain remanufactured parts equivalent to new in performance or may have been subject to
incidental use.
Warranty does not apply to defects resulting from (a) improper or inadequate maintenance or calibration, (b)
software, interfacing, parts or supplies not supplied by HP, (c) unauthorized modification or misuse, (d) operation
outside of the published environmental specifications for the product, or (e) improper site preparation or
maintenance.
TO THE EXTENT ALLOWED BY LOCAL LAW, THE ABOVE WARRANTIES ARE EXCLUSIVE AND NO OTHER
WARRANTY OR CONDITION, WHETHER WRITTEN OR ORAL, IS EXPRESSED OR IMPLIED AND
HP SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OR CONDITIONS OF MERCHANTABILITY,
SATISFACTORY QUALITY, AND FITNESS FOR A PARTICULAR PURPOSE. Some countries/regions, states or
provinces do not allow limitations on the duration of an implied warranty, so the above limitation or exclusion
might not apply to you. This warranty gives you specific legal rights and you might also have other rights that vary
from country/region to country/region, state to state, or province to province. HP's limited warranty is valid in any
country/region or locality where HP has a support presence for this product and where HP has marketed this
product. The level of warranty service you receive may vary according to local standards. HP will not alter form, fit
or function of the product to make it operate in a country/region for which it was never intended to function for
legal or regulatory reasons.
TO THE EXTENT ALLOWED BY LOCAL LAW, THE REMEDIES IN THIS WARRANTY STATEMENT ARE
YOUR SOLE AND EXCLUSIVE REMEDIES. EXCEPT AS INDICATED ABOVE, IN NO EVENT WILL HP OR ITS
SUPPLIERS BE LIABLE FOR LOSS OF DATA OR FOR DIRECT, SPECIAL, INCIDENTAL, CONSEQUENTIAL
(INCLUDING LOST PROFIT OR DATA), OR OTHER DAMAGE, WHETHER BASED IN CONTRACT, TORT, OR
OTHERWISE. Some countries/regions, states or provinces do not allow the exclusion or limitation of incidental or
consequential damages, so the above limitation or exclusion may not apply to you.
THE WARRANTY TERMS CONTAINED IN THIS STATEMENT, EXCEPT TO THE EXTENT LAWFULLY
PERMITTED, DO NOT EXCLUDE, RESTRICT OR MODIFY AND ARE IN ADDITION TO THE MANDATORY
STATUTORY RIGHTS APPLICABLE TO THE SALE OF THIS PRODUCT TO YOU.
DURATION OF LIMITED WARRANTY
1 year, Return to Authorized Service Center
ENWW Hewlett-Packard limited warranty statement 23
Page 40
Limited warranty for the print cartridges and imaging drum
This HP product is warranted to be free from defects in materials and workmanship during its
useful life (end of life is indicated by a printer control panel low-life message).
This warranty does not cover products that have been modified, refurbished,
remanufactured, misused, or tampered with in any way.
This limited warranty gives you specific legal rights. You may have other rights which vary
from state to state, province to province, and country/region to country/region.
The above warranties are exclusive and no other warranty, whether written or oral, is
expressed or implied. The Hewlett-Packard Company specifically disclaims the implied
warranties or merchantability and fitness for a particular purpose. To the extent allowed by
applicable law, in no event shall Hewlett-Packard Company be liable for any incidental,
consequential, special, indirect, punitive, or exemplary damages or lost profits from any
breach of this warranty or otherwise.
In the event that your product proves to be defective, please return to place of purchase with
a written description of the problem.
24 Chapter 1 Product information ENWW
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Print cartridge information
At 5% page coverage, a black print cartridge will print approximately 5,000 pages. Color print
cartridges (yellow, cyan, and magenta) will print 2,000 pages each, and extended-life color
print cartridges (yellow, cyan, and magenta) will print 4,000 pages each. These estimates
are only approximate; usage conditions and print patterns can cause results to vary.
Refilled print cartridges
While HP does not prohibit the use of refilled print cartridges during the warranty period or
while the product is under a maintenance contract, it is not recommended for the following
reasons:
● Repairs resulting from the use of refilled cartridges are not covered under HP warranty
or maintenance contracts.
● HP has no controls or processes to ensure that a refilled cartridge functions at the high
level of reliability of a new HP LaserJet print cartridge. HP also cannot predict the long-
term reliability effect on the product from using different toner formulations found in
refilled cartridges.
● The print quality of HP LaserJet print cartridges influences the customer’s perception of
the product. HP has no control over the actual print quality of a refilled cartridge.
● Parts that are critical to print quality might not be replaced when the cartridge is refilled
with toner.
HP LaserJet printing supplies
In many countries/regions, this product's printing supplies (for example the print cartridge)
can be returned to HP through the HP Printing Supplies Returns and Recycling Program. An
easy-to-use and free take-back program is available in more than 30 countries/regions.
Multilingual program information and instructions are included in every new HP LaserJet
print cartridge and supplies package.
HP Printing Supplies Returns and Recycling Program information
Since 1990, the HP Printing Supplies Returns and Recycling Program has collected millions
of used LaserJet print cartridges that otherwise might have been discarded in the world's
landfills. The HP LaserJet print cartridges and supplies are collected and bulk shipped to our
resource and recovery partners, who disassemble the cartridges. Remaining materials are
separated and converted into raw materials for use by other industries to make a variety of
useful products.
U.S. returns
For a more environmentally responsible return of used cartridges and supplies,
HP encourages the use of bulk returns. Simply bundle two or more cartridges together and
use the single, pre-paid, pre-addressed UPS label that is supplied in the package that the
new cartridge comes in. For more information in the U.S., call 800-340-2445 or visit the
HP LaserJet Supplies Web site at www.hp.com/recycle.
Non-U.S. returns
ENWW Print cartridge information 25
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Non-U.S. customers should call the local HP Sales and Service office or visit the
www.hp.com/recycle Web site for further information regarding availability of the
HP Supplies Returns and Recycling program.
26 Chapter 1 Product information ENWW
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Regulatory statements
Declaration of Conformity
according to ISO/IEC Guide 22 and EN 45014
Manufacturer's Name: Hewlett-Packard Company
Manufacturer's Address: 11311 Chinden Boulevard
Boise, Idaho 83714-1021, USA
declares, that the product
Product Name: HP color LaserJet 2550L/2550Ln/2550n
Regulatory Model Number
Product Options: ALL
conforms to the following Product Specifications:
Safety: IEC 60950:1999 / EN60950:2000
EMC:
Supplementary Information:
The product herewith complies with the requirements of the EMC Directive 89/336/EEC and the Low Voltage Directive 73/23/EEC, and carries
the CE-marking accordingly.
1) The product was tested in a typical configuration with Hewlett-Packard Personal Computer Systems. Compliance testing of product to
standard with exception of Clause 9.5, which is not yet in effect.
2) This Device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
3) This product includes LAN (Local Area Network) options. When the interface cable is attached to LAN connectors, the product meets the
requirements of EN55022 & CNS13438 Class A in which case the following applies: "Warning — This is a class A product. In a domestic
environment this product may cause radio interference in which case the user may be required to take adequate measures."
3) For regulatory purposes, this product is assigned a Regulatory model number. This number should not be confused with the product name
or the product number(s).
For regulatory topics only:
Australia Contact:
European Contact: Your Local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH, Department HQ-TRE / Standards
USA Contact:
4)
:
IEC 60825-1:1993+A1:1997 +A2:2001 / EN 60825-1:1994+A11:1996 +A2:2001 (Class 1 Laser/LED Product)
GB4943-2001
CISPR 22:1997 / EN 55022:1998 Class B
EN 61000-3-2:2000
EN 61000-3-3:1995 / A1
EN 55024:1998
FCC Title 47 CFR, Part 15 Class B
Product Regulations Manager, Hewlett-Packard Australia Ltd. 31-41 Joseph Street Blackburn, Victoria 3130, Australia
Europe Herrenberger Straße 140 Böblingen, D-71034, +49-7031-14-3143
Product Regulations Manager, Hewlett-Packard Company PO Box 15, Mail Stop 160 Boise, ID 83707-0015, USA
(Phone: 208-396-6000)
BOISB-0305-00. Including: Q3709A - Optional 250-sheet input tray; Q3710A - Optional
500-sheet input tray
1) 3)
2)
/ ICES-003, Issue 3/ GB9254-1998, GB17625.1-1998 / CNS 13438
Boise, Idaho , USA
1 April, 2004
ENWW Regulatory statements 27
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Safety statements
Laser safety statement
The Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug
Administration has implemented regulations for laser products manufactured since August 1,
1976. Compliance is mandatory for products marketed in the United States. The printer is
certified as a "Class 1" laser product under the U.S. Department of Health and Human
Services (DHHS) Radiation Performance Standard according to the Radiation Control for
Health and Safety Act of 1968.
Since radiation emitted inside the printer is completely confined within protective housings
and external covers, the laser beam cannot escape during any phase of normal user
operation.
WARNING!
Using controls, making adjustments, or performing procedures other than those specified in
the HP Color LaserJet 2550 Series Printer User Guide may result in exposure to hazardous
radiation.
Canadian DOC statement
Complies with Canadian EMC Class B requirements.
«Conforme àla classe B des normes canadiennes de compatibilité électromagnétiques
(CEM).»
Korean EMI statement
28 Chapter 1 Product information ENWW
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Finnish laser statement
LASERTURVALLISUUS
LUOKAN 1 LASERLAITE
KLASS 1 LASER APPARAT
HP color LaserJet 2550L, 2550Ln, 2550n -laserkirjoitin on käyttäjän kannalta turvallinen
luokan 1 laserlaite. Normaalissa käytössä kirjoittimen suojakotelointi estää lasersäteen
pääsyn laitteen ulkopuolelle.
Laitteen turvallisuusluokka on määritetty standardin EN60825-1 (1994) mukaisesti.
VAROITUS!
Laitteen käyttäminen muulla kuin käyttöohjeessa mainitulla tavalla saattaa altistaa käyttäjän
turvallisuusluokan 1 ylittävälle näkymättömälle lasersäteilylle.
VARNING!
Om apparaten används på annat sätt än i bruksanvisning specificerats, kan användaren
utsättas för osynlig laserstrålning, som överskrider gränsen för laserklass 1.
HUOLTO
HP color LaserJet 2550L, 2550Ln, 2550n -kirjoittimen sisällä ei ole käyttäjän huollettavissa
olevia kohteita. Laitteen saa avata ja huoltaa ainoastaan sen huoltamiseen koulutettu
henkilö. Tällaiseksi huoltotoimenpiteeksi ei katsota väriainekasetin vaihtamista, paperiradan
puhdistusta tai muita käyttäjän käsikirjassa lueteltuja, käyttäjän tehtäväksi tarkoitettuja
ylläpitotoimia, jotka voidaan suorittaa ilman erikoistyökaluja.
VARO!
Mikäli kirjoittimen suojakotelo avataan, olet alttiina näkymättömälle lasersäteilylle laitteen
ollessa toiminnassa. Älä katso säteeseen.
VARNING!
Om laserprinterns skyddshölje öppnas då apparaten är i funktion, utsättas användaren för
osynlig laserstrålning. Betrakta ej strålen.
Tiedot laitteessa käytettävän laserdiodin säteilyominaisuuksista:
Aallonpituus 770-800 nm
Teho 5 mW
Luokan 3B laser
ENWW Safety statements 29
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30 Chapter 1 Product information ENWW
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Installation and operation
2
Chapter contents
Chapter contents .....................................................................................................................31
Operating environment ............................................................................................................32
Interface ports .........................................................................................................................33
Control panel features .............................................................................................................34
Understanding Supplies Status ........................................................................................34
Understanding Printer Status ...........................................................................................35
Input trays ................................................................................................................................37
Printer output paths .................................................................................................................38
Top output bin ...................................................................................................................38
Rear output door ...............................................................................................................38
Loading media .........................................................................................................................39
Loading tray 1 ...................................................................................................................39
Loading optional tray 2 .....................................................................................................40
Loading optional tray 3 .....................................................................................................42
HP LaserJet Toolbox ...............................................................................................................44
Supported operating systems ...........................................................................................44
Supported browsers .........................................................................................................44
Viewing the HP LaserJet Toolbox ...................................................................................45
Status tab ..........................................................................................................................45
Troubleshooting tab ..........................................................................................................45
Alerts tab ...........................................................................................................................46
Documentation tab ...........................................................................................................46
Device Settings window ....................................................................................................47
Other links .........................................................................................................................48
ENWW Chapter contents 31
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Operating environment
Place the printer on a sturdy, level surface in a well-ventilated area that meets the following
environmental requirements:
● temperature: 15° to 32.5° C (59° to 90.5° F)
● humidity: 10 percent to 80 percent relative humidity (no condensation)
● away from direct sunlight, open flames, and ammonia fumes
● with sufficient space around the printer for access and ventilation
1068 mm (42.0 inches)
387 mm
(15.2 inches)
590 mm (23.2 inches)
505 mm (19.9 inches)
643 mm (25.3 inches)
694 mm (27.3 inches)
830 mm (32.7 inches)
Figure 2-1.
Space required
32 Chapter 2 Installation and operation ENWW
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Interface ports
The printer has two interface ports: an IEEE-1284B parallel port and a high-speed USB port.
The HP color LaserJet 2550Ln and 2550n models include an HP Jetdirect internal print
server that contains a 10/100Base-T (RJ-45) port.
1
2
1 Parallel port (IEEE-1284B)
2 High-speed USB port
3 10/100Base-T port (HP color LaserJet 2550Ln and 2550n printers only)
3
ENWW Interface ports 33
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Control panel features
The printer contains the following lights and buttons on the control panel:
2
3
4
1
5
6
7
9
10
8
11
12
1 Supplies status lights and buttons
2 Black print-cartridge light
3 Cyan print-cartridge light
4 Magenta print-cartridge light
5 Yellow print-cartridge light
6 R
OTATE CAROUSEL
7 Imaging drum light
8 Printer status lights and buttons
9 C
ANCEL JOB
10 Attention light (amber)
11 Ready light (green)
12 Go light and G
The lights and buttons are arranged into two main groups: Supplies Status (top) and Printer
Status (bottom). To interpret and troubleshoot the control panel light messages, see
panel light messages.
button
button
O
button (both green)
Control
Understanding Supplies Status
The printer contains five lights and one button to indicate and control the status of the print
cartridges and imaging drum. To interpret and troubleshoot control panel light messages,
Control panel light messages.
see
Black, Cyan, Magenta, and Yellow Supplies Status lights
These lights indicate when a print cartridge is low (the light is on), or empty or missing (the
light blinks). The lights also indicate when a non-HP print cartridge is installed (the light
blinks and the Attention light is on).
34 Chapter 2 Installation and operation ENWW
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Rotate Carousel button
When the top cover is closed, pressing (R
carousel to bring the next print cartridge into the top position. The light for the print cartridge
that is approaching the top position blinks quickly two or three times.
OTATE CAROUSEL
) rotates the print-cartridge
Imaging drum light
This light indicates when the imaging drum is low (light is on), or empty or missing (light
blinks). The light also indicates when a non-HP imaging drum is installed (the light blinks and
the Attention light is on).
Understanding Printer Status
The printer has two buttons and three lights to indicate and control the printer status. To
interpret and troubleshoot the control panel light messages, see
Cancel Job button
●
When the Ready light is blinking, pressing
●
When the printer is not experiencing an error, pressing
simultaneously prints a Configuration page and a Supplies Status page. (If an
HP Jetdirect print server is installed, an HP Jetdirect page also prints.)
(C
ANCEL JOB
Control panel light messages.
) cancels the current job.
(GO) and (C
ANCEL JOB
)
CAUTION
● When a Supplies Status light is blinking and the Attention light is on (indicating that a
(C
non-HP supply has been installed), pressing
printing.
You might not receive any indication when a non-HP supply is empty. If you continue
printing after the supply is empty, damage to the printer can occur. See
limited warranty statement.
ANCEL JOB
) allows you to continue
Hewlett-Packard
Attention light
Generally, the Attention light blinks when the printer is out of paper, when a jam has
occurred, or when other problems that need attention occur.
The Attention light is on and one of the Supplies Status lights is blinking the first time a nonHP supply is installed.
Ready light
The Ready light is on when the printer is ready to print (experiencing no errors that prevent
printing) and blinks when it is receiving data to be printed.
ENWW Control panel features 35
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Go light and Go button
●
When the Go light is on and the Attention light is blinking, pressing
(GO) continues
the print job after you load print media for a manual feed, or clears some errors.
● When the Go light is blinking, the top cover has been opened and then closed or you
(R
have pressed
OTATE CAROUSEL
state. If you do not press
●
When the Go light is off, pressing
(C
ANCEL JOB
) simultaneously prints a Configuration page and a Supplies Status page.
). Pressing (GO) returns the printer to the Ready
(GO), the printer returns to the Ready state on its own.
(GO) prints a Demo page. Pressing (GO) and
(If an HP Jetdirect print server is installed, an HP Jetdirect page also prints.)
36 Chapter 2 Installation and operation ENWW
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Input trays
The HP color LaserJet 2550 series printer comes with one or more input trays. See Table
2-1. Input tray configuration for configuration information.
Figure 2-2.
Standard and optional input trays—HP color LaserJet 2550 series printers
Table 2-1. Input tray configuration
Printer model Standard input trays Optional input trays
HP color LaserJet 2550L tray 1 (125-sheet) tray 2 (250-sheet)
tray 3 (500-sheet)
HP color LaserJet 2550Ln tray 1 (125-sheet) tray 2 (250-sheet)
tray 3 (500-sheet)
HP color LaserJet 2550n tray 1 (125-sheet)
tray 2 (250-sheet)
Note
Because tray 2 and tray 3 are not included with all models, they are referred to as optional
tray 3 (500-sheet)
tray 2 and optional tray 3 in this documentation.
Optional tray 2 must be installed in order to install optional tray 3.
By default, the printer draws first from tray 1. If tray 1 is empty, the printer draws first from
optional tray 3 (if installed) and then from optional tray 2.
ENWW Input trays 37
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Printer output paths
The printer comes with the top output bin and rear output door for printing to a straightthrough paper path. Print jobs emerge from the top output bin when the rear output door is
closed. Print jobs emerge from the back of the printer when the rear output door is open.
Top output bin
Use the top output bin when printing most jobs, including jobs on average-weight paper and
letterhead, and transparencies. The top output bin can hold up to 125 sheets. Prevent more
than 125 sheets from accumulating in the top output bin, or jams can occur.
Rear output door
Print jobs emerge from the back of the printer when the rear output door is open. Use the
rear output door (straight-through paper path) when printing envelopes, labels, heavy- or
lightweight paper, and other thick or special print media. Remove each sheet as it exits the
printer.
Figure 2-3.
38 Chapter 2 Installation and operation ENWW
Printer output paths
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Loading media
Load special print media such as envelopes, labels, custom-size media, and transparencies
in tray 1 only. Load only paper in optional tray 2 or optional tray 3.
Loading tray 1
Tray 1 (multipurpose tray) holds up to 125 sheets of paper or other print media, or up to 10
envelopes.
To load tray 1
CAUTION
Avoid adding print media to tray 1 while the printer is printing, or jams can occur.
1. Open tray 1.
2. Slide out the tray extender. If the print media being loaded is longer than 229 mm (9
inches), also open the additional tray extender.
3. Slide the width guides slightly wider than the print media.
ENWW Loading media 39
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4. Place print media into the tray with the side to be printed up, and the top, short edge in
first.
Note
CAUTION
If you are manually duplexing, see the HP Color LaserJet 2550 Series Printer User Guide for
loading instructions.
5. Slide the paper width guides inward until they lightly touch the print media stack on both
sides without bending it. Make sure that the print media fits under the tabs on the width
guides.
If you choose to close tray 1, first wait for the printer to finish printing. Closing the tray before
printing is complete can cause jams.
6. On the back of the printer, lower the rear output door if you are printing on special
media, such as labels, envelopes, or heavy or light paper, to prevent curl.
Loading optional tray 2
Optional tray 2 supports standard-size paper only, including average-weight letterhead and
prepunched paper. For additional information about loading letterhead and prepunched
paper, see the HP Color LaserJet 2550 Series Printer User Guide.
CAUTION
40 Chapter 2 Installation and operation ENWW
Print special print media such as labels and transparencies from tray 1 only. Printing special
print media from optional tray 2 or optional tray 3 can cause jams.
Page 57
To load optional tray 2
1. Pull optional tray 2 out of the printer and remove any paper.
2. Move the side width guides to match the size of paper you are loading.
3. Extend the rear of the tray until the arrow points to the size you are loading.
Note
4. Load the paper. If this is special paper such as letterhead, load it with the side to be
printed facing down and the top edge toward the front of the tray.
If you are manually duplexing, see the HP Color LaserJet 2550 Series Printer User Guide for
loading instructions.
ENWW Loading media 41
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5. Make sure that the stack of paper is flat in the tray at all four corners, and keep it below
the height tabs on the paper length guide in the rear of the tray. Push down on the metal
paper-lift plate to lock it into place.
6. Slide the tray back into the printer. If you set the rear of the tray to one of the longer
sizes, the back of the tray will protrude from the back of the printer.
CAUTION
Loading optional tray 3
The optional tray 3 supports A4- and letter-size paper. Optional tray 3 supports only paper,
which includes average-weight letterhead and prepunched paper.
For additional information about letterhead and prepunched paper, see the Series Printer
User.
Print special print media such as labels and transparencies from tray 1 only. Printing special
print media from optional tray 2 or optional tray 3 can cause jams.
To load optional tray 3
1. Pull the tray out of the printer and remove any paper.
2. For letter-size paper, pull up the rear stop. For A4-size paper, push down the rear stop.
42 Chapter 2 Installation and operation ENWW
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3. For letter-size paper, move the side width guides outward as far as possible. For A4-size
paper, move the side width guides inward as far as possible.
4. Load the paper. If this is special paper such as letterhead, load it with the side to be
printed facing down and the top edge toward the front of the tray.
Note
If you are manually duplexing, see the HP Color LaserJet 2550 Series Printer Series Printer
User for loading instructions.
5. Make sure that the stack of paper is flat in the tray at all four corners, and keep it below
the height tabs on the length guide in the rear of the tray.
6. Slide the tray back into the printer.
ENWW Loading media 43
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HP LaserJet Toolbox
The HP LaserJet Toolbox is a Web application that you can use for the following tasks:
● Check the printer status.
● Configure the printer settings.
● View troubleshooting information.
● View online documentation.
You can view the HP LaserJet Toolbox when the printer is directly connected to your
computer or when it is connected to the network. You must perform a complete software
installation to use the HP LaserJet Toolbox.
Note
You do not have to have Internet access to open and use the HP LaserJet Toolbox.
However, if you click a link in the Other Links area, you must have Internet access to go to
the site that is associated with the link. See
Other links for more information.
Supported operating systems
The HP LaserJet Toolbox is supported for the following operating systems:
● Windows 98, 2000, Me, and XP
● Mac OS X, v. 10.2, or later
Supported browsers
To use the HP LaserJet Toolbox, you must have one of the following browsers:
Windows
● Microsoft Internet Explorer 5.5 or later
● Netscape Navigator 6.2 or later
● Opera Software ASA Opera 7 or later
Macintosh (OS X, v. 10.2 or later, only)
● Microsoft Internet Explorer 5.1 or later
● Netscape Navigator 6.23 or later
● Safari 1.0
All pages can be printed from the browser.
44 Chapter 2 Installation and operation ENWW
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Viewing the HP LaserJet Toolbox
1. Open the HP LaserJet Toolbox in one of these ways:
● On the Windows desktop, double-click the HP LaserJet Toolbox icon.
● On the Windows Start menu, point to Programs, and then click the HP LaserJet
Toolbox.
● For Macintosh OS X, on the hard drive, click Applications, and then click the
Utilities folder. Double-click the HP LaserJet Toolbox icon.
Note
After you open the URL, you can bookmark it so that you can return to it quickly in the future.
2. The HP LaserJet Toolbox opens in a Web browser. The HP LaserJet Toolbox software
contains the following sections:
Status tab
●
Troubleshooting tab
●
Alerts tab
●
Documentation tab
●
Device Settings window
●
HP LaserJet Toolbox links
●
Other links
●
Status tab
The Status tab has links to the following main pages:
● Device Status. View printer status information. This page indicates printer conditions
such as a jam or an empty tray. After you correct a problem with the printer, click the
Refresh button to update the device status.
● Supplies Status. View detailed supplies status such as the percent of toner remaining
in the print cartridge and the number of pages that have been printed with the current
print cartridge. This page also has links to order supplies and to find recycling information.
● Print Info. Print the configuration page and various other information pages that are
available for the printer, such as the supplies status page and the demo page.
Troubleshooting tab
The Troubleshooting tab has links to the following main pages:
● Printer Lights. Click the control panel lights on this simulator to find help for a specific
control panel light pattern. For several conditions, animated video clips are available that
demonstrate the recommended action to solve the problem.
● Print Quality Tools. Print a page that assists in solving print-quality problems, view
information about print-quality problems, print the cleaning page and clean the printer,
and calibrate the printer to maintain color print quality.
● Maintenance. Print the cleaning page and clean the printer, view information about
printer supplies, and view animated demos of how to replace the print cartridges and the
imaging drum.
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● Paper Jams. View information on locating and clearing jams, and view an animated
demo of how to clear jams.
● Supported Media. View information about media that the printer supports, and view
information about solving problems related to print media.
● Demo Page. Print the Demo page for this printer.
Alerts tab
Use the Alerts tab to configure the printer to automatically notify you of printer alerts. The
Alerts tab has links to the following main pages:
● Set up status alerts
● Set up e-mail alerts
● Administrative settings
Set up status alerts page
On the Set up status alerts page, you can choose to turn alerts on or off, specify when the
printer should send an alert, and select from two different types of alerts:
● Pop-up message
● Taskbar icon
Click Apply to activate the settings.
Set up e-mail alerts page
On the Set up e-mail alerts page, you can set the e-mail addresses that you want to have
alerts sent to, and specify what kind of alerts should go to which e-mail addresses. You can
have two e-mail destinations for the following alerts:
● Supplies
● Service
● Paper path
● Advisory
You must set up a simple mail transfer protocol (SMTP) server to send e-mail alerts.
Documentation tab
The Documentation tab contains links to these information sources:
● Print: How Do I? Contains information about how to use the printer to print different
types of print jobs (for example, how to manually duplex).
● Series Printer User. Contains the information about the printer usage, warranty,
specifications, and support that you are currently reading. The Series Printer User is
available in both HTML and PDF format.
● Readme. Contains important information about the printer that is not available in the
Series Printer User. The Late-Breaking Readme contains last-minute information about
the printer (in English only).
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Device Settings window
When you click the Device Settings button, a new window opens. The Device Settings
window has the following sections:
● Information tab
● Settings tab
● Network link
Information tab
The Information tab provides quick links to the following information:
● Device Status. View information about the printer's current status.
● Supplies Status. View information about the supplies installed in the printer. A link is
provided to the HP Web site for ordering supplies.
● Event Log. View a history of printer errors. The most recent error is at the top of the list.
● Save/Restore Settings. Save the current settings for the printer to a file on your
computer. Use this file to load the same settings onto another printer or to restore these
settings to this printer at a later time.
● Device Configuration. View a detailed description of the printer's current configuration
including the amount of memory installed and whether optional trays are installed.
Note
Settings tab
The Settings tab has links to several pages where you can view and change the printer's
configuration.
Software settings can override settings that are made in the HP LaserJet Toolbox.
● Device Information. View basic information about the printer.
● Paper Handling. View and change the settings for the printer's trays.
● Printing. View and change the default printer job settings.
● PCL. View and change the PCL font information.
● PostScript. View and change settings for PS errors and timeout.
● Print Quality. View and change the print-quality settings.
● Print Modes. View and change the print modes for various media types.
● System Setup. View and change system information.
● I/O. View and change the I/O timeout setting.
● Service. Gain access to various procedures required to service the printer.
Network window
The network administrator can use the Network window to control the network-related
settings for the printer when it is connected to an IP-based network. This button will not
appear if the printer is directly connected to a computer, or if the printer is connected to a
network through anything other than an HP Jetdirect print server.
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HP LaserJet Toolbox links
The HP LaserJet Toolbox links at the left of the screen provide links to the following options:
● Select a device. Select from all of the HP LaserJet Toolbox-enabled devices.
● View current alerts. View the current alerts for all printers that have been set up. (You
must be printing to view the current alerts.)
● Text only page. View the HP LaserJet Toolbox as a site map that links to text-only
pages.
Other links
This section contains links that connect you to the Internet. You must have Internet access in
order to use any of these links. If you use a dial-up connection and did not connect when
you first opened the HP LaserJet Toolbox, you must connect before you can visit these Web
sites. Connecting might require that you close the HP LaserJet Toolbox and reopen it.
● HP Instant Support.
● Product Registration. Connects to the HP product registration Web site.
● Product Support. Connects to the support site for the HP color LaserJet 2550 series
printer. Then, you can search for help with a specific problem.
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Maintenance
3
Chapter contents
Chapter contents .....................................................................................................................49
Life expectancies of supplies ..................................................................................................50
User-replaceable parts ............................................................................................................52
Replacing the tray 1 pickup roller and separation pad .....................................................52
Replacing the separation pad in optional tray 2 or in optional tray 3 ...............................57
Cleaning the printer .................................................................................................................61
Cleaning the printer ..........................................................................................................61
Calibrating the printer ..............................................................................................................63
To calibrate the printer at the printer ................................................................................63
To calibrate the printer from the HP LaserJet Toolbox ....................................................63
Managing supplies ..................................................................................................................64
Supplies life ......................................................................................................................64
Checking and ordering supplies .......................................................................................64
Storing supplies ................................................................................................................65
Replacing and recycling supplies .....................................................................................65
HP policy for non-HP supplies ..........................................................................................66
HP fraud hotline ................................................................................................................66
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Life expectancies of supplies
Inspect supplies when you service the printer. Replace supplies as needed, based on failure
or wear, rather than on usage.
The following table lists approximate schedules for replacing supplies.
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Table 3-1. Life expectancies of supplies
Description Part number Estimated life (in number
of pages at 5 percent
1
)
Print cartridge, black (user
replaceable)
Print cartridge, cyan (user
replaceable)
Print cartridge, cyan (user
replaceable)
Print cartridge, yellow (user
replaceable)
Print cartridge, yellow (user
replaceable)
Print cartridge, magenta
(user replaceable)
Print cartridge, magenta
(user replaceable)
Q3960-67901
Q3960-67902 (EMEA)
Q3971-67901
Q3971-67902 (EMEA)
Q3961-67901
Q3961-67902 (EMEA)
Q3972-67901
Q3972-67902 (EMEA)
Q3962-67901
Q3962-67902 (EMEA)
Q3973-67901
Q3973-67902 (EMEA)
Q3963-67901
Q3963-67902 (EMEA)
coverage
5,000
2,000
4,000 Extended-life cartridge
2,000
4,000 Extended-life cartridge
2,000
4,000 Extended-life cartridge
Remarks
Imaging drum Q3964-67901 20,000 (black only)
5,000 (color)
Transfer roller
RF5-4067-000CN Can affect print quality and
The average life is 6,000 to
8,000 pages.
paper movement.
Printer pickup roller
RB3-0160-000CN Look for glazing and/or
cracks.
Printer separation pad
RF5-4012-000CN Can affect document
movement.
Fuser assembly, 110-127 V)
RG5-7572-000CN Can affect print quality and
document movement.
Fuser assembly, 220-240 V) RG5-7573-000CN Can affect print quality and
document movement.
Separation pad, optional
trays 2 and 3
1
The estimated print cartridge life is based on letter- or A4-sized paper with an average of 5% toner coverage and
RB2-9960-000CN Can affect document
movement.
a medium density setting. Print cartridge life can be extended further by conserving toner by using draft-mode
settings.
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User-replaceable parts
Pickup rollers and separation pads are user-replaceable parts.
Replacing the tray 1 pickup roller and separation pad
1. Turn the printer off and disconnect the power cable from the back of the printer.
2. Open tray 1.
3. Find the faceplate cover that is located beneath the pickup roller in tray 1.
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4. Grasp both sides of the center tab and pull the cover out of the printer.
5. Squeeze the tab on the idler roller that is located on the right side of the pickup roller. If
the tab is not visible, rotate the idler roller so that the tab is toward the front of the printer.
6. Slide the idler roller to the right to separate it from the pickup roller.
7. Squeeze the tab on the idler roller that is located on the left side of the pickup roller. If
the tab is not visible, rotate the idler roller so that the tab is toward the front of the printer.
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8. Slide the idler roller to the left to separate it from the pickup roller.
9. Press and hold the button that is located on the right side of the pickup roller. Slide the
pickup roller slightly to the right, and then pull it off of the shaft.
CAUTION
To prevent the shaft retaining pin from falling out, do not move the remaining hub that is
located to the left of the pickup roller.
10. Locate the separation pad beneath the area of the shaft from which the pickup roller was
removed.
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11. Insert a flatblade screwdriver into the slot under the separation pad. Pry the pad up from
the spring-loaded base by twisting the screwdriver until the tabs are separated from the
printer.
12. Use one hand to push the spring-loaded base down and then use the other hand to pull
the separation pad up and out of the printer.
Note
Note
If you feel resistance when you try to remove the pad, make sure that the tabs are
completely separated from the printer.
13. Push the spring-loaded base down and position the new separation pad in the empty slot.
Make sure that the two tabs on the edge of the pad are toward the front of the printer.
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14. Snap both sides of the separation pad firmly into place until they click.
CAUTION
If the pad is not straight, or if space exists between the pad and the base, make sure that the
tabs on the pad are toward the front of the printer.
15. Hold down the new separation pad. Position the new pickup roller so that the button is
on the right side, and the open side of the roller faces down. Make sure that the small
ridge on the open side of the roller aligns with the groove in the shaft.
16. Slide the left and right idler rollers inward, against the pickup roller, until the idler rollers
click into place.
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17. Hold the faceplate cover as shown in the illustration, and align the cover with the rails on
the inside of the printer.
18. Grasp both sides of the center tab and insert the cover into the printer until the cover
clicks into place. Close tray 1.
Replacing the separation pad in optional tray 2 or in optional tray 3
1. Remove the tray from the printer and place it on a flat surface. Remove any paper from
the tray.
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2. Locate the separation pad in the base at the inside-front edge of the tray.
3. Press the large metal plate at the bottom of the tray down. Insert a flatblade screwdriver
in the slots on each side of the base and push the tabs out of the slots.
Note
In a 250-sheet tray, the plate locks down; in a 500-sheet tray, hold the plate down manually.
4. Pull the separation pad up and out of the tray.
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5. Use one hand to position the new separation pad above the empty base. Align the
grooves on the sides of the pad with the sides of the base, and then slide the pad down
until the tabs snap into the slots on the base.
6. Reload any print media, and then slide the tray into the printer.
7. Reconnect the power cable. Turn the printer on.
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8. When the green Ready light is on, press Go to print a Demo page, which verifies that
the printer works and that installation is complete.
9. If the page does not print, or to find additional help, go to www.hp.com/support/clj2550.
Note
If the page does not print, reconnect the power cable. Make sure that the Ready light is on
and that no other lights are on or blinking. Make sure that print media is loaded and that all
parts are installed correctly.
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Cleaning the printer
During the printing process, paper, toner, and dust particles can accumulate inside the
printer. Over time, this buildup can cause print-quality problems such as toner specks or
smearing.
Cleaning the printer
Use a cleaning page to correct and prevent print-quality problems such as toner specks or
smearing.
Figure 3-1. Smearing
Figure 3-2.
Note
Toner specks
To use a cleaning page
The following procedure must be performed from the HP LaserJet Toolbox. To clean the
printer when the computer is running an operating system that does not support the
HP LaserJet Toolbox, see the Late-Breaking Readme on the CD-ROM, or visit www.hp.com/
support/clj2550.
1. Make sure that the printer is turned on and in the Ready state.
2. Open the HP LaserJet Toolbox.
3. On the Troubleshooting tab, click Maintenance, click Cleaning Page, and then click
Print. A page with a pattern prints from the printer.
4. At the printer, remove any print media that might be in tray 1.
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5. Remove the page that printed and load it face-down into tray 1 (see Figure 3-3. Loading
the cleaning page in tray 1).
Figure 3-3.
Loading the cleaning page in tray 1
6. At the computer, click Clean.
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Calibrating the printer
The printer automatically calibrates at various times. You can adjust the calibration settings
by using the HP LaserJet Toolbox.
Environmental differences, aging print cartridges, aging toner, and an aging imaging drum
might cause fluctuations in image density. The printer accounts for this with image
stabilization control. The printer automatically calibrates at various times to maintain the
highest level of print quality. You can also request a calibration by using the HP LaserJet
Toolbox.
The printer does not interrupt a print job to calibrate. It waits until the job is complete before
calibrating or cleaning. While the printer is calibrating, it pauses printing for the time that is
required to complete the calibration.
To calibrate the printer at the printer
Note
Press (GO) and (R
OTATE CAROUSEL
) simultaneously to start a calibration.
To calibrate the printer from the HP LaserJet Toolbox
This procedure applies to Windows operating systems only. Macintosh users should
calibrate the printer manually by using the previous procedure.
1. Open the HP LaserJet Toolbox in one of these ways:
● On the desktop, double-click the HP LaserJet Toolbox icon.
● On the Start menu, point to Programs, point to HP Color LaserJet 2550, and then
click HP LaserJet Toolbox.
2. On the Troubleshooting tab, click Print Quality (on the left side of the screen).
3. Click Calibrate Now.
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Managing supplies
For warranty information about these supplies, see Limited warranty for the print cartridges
and imaging drum.
Supplies life
The life of the imaging drum depends on the number of black-only or color pages that print
jobs require. An HP color LaserJet 2550 series printer imaging drum could last an average of
20,000 pages when printing black-only pages and 5,000 pages when printing color pages.
Actual life lies somewhere between these two numbers, depending on the number of blackonly pages you print versus color. The average life is between 6,000 and 8,000 pages.
Imaging-drum life is also affected each time the printer calibrates because calibrating causes
the imaging drum to rotate. Imaging-drum life is measured in terms of number of rotations
rather than number of pages printed.
The type and length of print jobs also affects drum life. A series of short print jobs uses more
drum life than an equivalent number of pages printed in a single large job. To extend drum
life, print multiple copies of a print job at one time rather than sending the same job to the
printer multiple times.
The life of a print cartridge depends on the amount of toner that print jobs require. When
printing text at 5% coverage, black print cartridges last an average of 5,000 pages and cyan,
magenta, and yellow print cartridges last an average of 2,000 pages. Extended-life cyan,
magenta, and yellow print cartridges last an average of 4,000 pages. (A typical business
letter has 5% coverage.)
NoteNote
Note
The imaging drum and print cartridges for this printer are not compatible with older, similar
printer models such as the HP color LaserJet 1500 series printer or the HP color LaserJet
2500 series printer.
For longer supplies life, you can order extended-life replacement cyan, magenta, or yellow
print cartridges for the HP color LaserJet 2550L printer that last an average of 4,000 pages
at 5% coverage.
Checking and ordering supplies
You can check the supplies status by using the printer control panel, printing a Supplies
Status page, viewing the HP LaserJet Toolbox, or viewing HP Web Jetadmin. HewlettPackard recommends that you place an order for a replacement print cartridge when you
first receive the Low message for a print cartridge. The Low message indicates that
approximately two weeks of life remain. When you use a new, authentic HP print cartridge or
imaging drum, you can obtain the following types of supplies information:
●
amount of cartridge or drum life remaining
● estimated number of pages that can be printed
● number of pages printed
● other supplies information
If the printer is connected to the network, you can set the HP LaserJet Toolbox to notify you
by e-mail when a print cartridge is low or the imaging drum is near the end of its useful life. If
the printer is directly connected to a computer, you can set the HP LaserJet Toolbox to notify
you when supplies are low.
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To check status and order supplies using the control panel
Do one of the following:
● Check the supplies status lights on the printer control panel. These lights indicate when
a print cartridge or the imaging drum is low or empty. The lights also indicate when a
non-HP print cartridge is first installed. See
patterns.
Supplies Status lights to interpret the light
●
Press
Configuration page and, possibly, the HP Jetdirect page) prints. Check the supplies
levels on the Supplies Status page.
If the supplies levels are low, you can order supplies through your local HP dealer, by
telephone, or online. See
ljsupplies to order online.
(Go) and (Cancel Job) simultaneously. A Supplies Status page (and the
Parts and diagrams for part numbers. See www.hp.com/go/
To check status and order supplies using the HP LaserJet Toolbox
You can configure the HP LaserJet Toolbox to notify you when the supplies are low. You
can choose to receive alerts by e-mail or as a pop-up message or taskbar icon. To order
supplies by using the HP LaserJet Toolbox, in the Other Links area, click Order supplies.
For more information, see
Other links.
To check status and order supplies using HP Web Jetadmin
In HP Web Jetadmin, select the printer device. The device status page shows supplies
information. To order, use the HP LaserJet Toolbox. Or, see
Parts and diagrams.
Storing supplies
CAUTION
Follow these guidelines for storing print cartridges and the imaging drum:
● Do not remove the print cartridge or imaging drum from its package until you are ready
to use it.
To prevent damage, do not expose the print cartridge or imaging drum to light for more than
a few minutes.
● See
● Store the supply in a horizontal position.
● Store the supply in a dark, dry location away from heat and magnetic sources.
Table 1-5. Environmental specifications for operating- and storage-temperature
ranges.
Replacing and recycling supplies
To install a new HP print cartridge or imaging drum, follow the instructions included in the
box that contains the new supply, or see the HP Color LaserJet 2550 Series Getting Started
Guide.
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To recycle supplies, place the used supply in the box in which the new supply arrived. Use
the enclosed return label to send the used supply to HP for recycling. For complete
information, see the recycling guide that is included with each new HP supply item. See
HP Printing Supplies Returns and Recycling Program information for more information about
HP's recycling program.
HP policy for non-HP supplies
Hewlett-Packard Company cannot recommend the use of non-HP supplies, either new or
remanufactured. Because they are not HP products, HP cannot influence their design or
control their quality. Service or repairs that are required as a result of using a non-HP supply
will not be covered under the printer warranty.
When you insert a supply into the printer, the printer informs you if the supply is not a
genuine HP supply. If you insert a genuine HP supply that has reached the low state from
another HP printer, the printer identifies the supply as non-HP. Simply return the supply to
the original printer to reactivate HP features and functionality.
Resetting the printer for non-HP supplies
When you install a non-HP print cartridge or imaging drum, the light next to the print
cartridge or imaging drum you replaced blinks and the Attention light is on. In order to print
CAUTION
with this supply, you must press
HP supply. The status lights will not indicate when this type of supply is low or empty.
The printer will not stop printing when a non-HP supply is empty. Printer damage can occur if
the printer attempts to print with an empty print cartridge or imaging drum. See
the printing software.
(Cancel Job) the first time you install this non-
Uninstalling
HP fraud hotline
Call the HP fraud hotline if the supplies status lights indicate that the print cartridge or
imaging drum is not an HP product and you think that it is genuine. Hewlett-Packard will help
determine if the product is genuine and take steps to resolve the problem.
Your print cartridge or imaging drum might not be a genuine HP product if you notice the
following issues:
● You are experiencing a large number of problems with the print cartridge or imaging
drum.
● The print cartridge or imaging drum does not look like an HP product usually does (for
example, the pull tab or the box is different).
In the United States, call toll-free: 877-219-3183.
Outside the United States, you can call collect. Dial the operator and ask to place a collect
call to this telephone number: 770-263-4745. If you do not speak English, a representative at
the HP fraud hotline who speaks your language will assist you. Or, if someone who speaks
your language is not available, a language line interpreter will connect approximately one
minute after the beginning of the call. The language line interpreter is a service that
translates between you and the representative for the HP fraud hotline.
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Theory of operation
4
Chapter contents
Chapter contents .....................................................................................................................67
Introduction ..............................................................................................................................68
Engine control system .............................................................................................................70
Basic sequence of operation ............................................................................................70
Power-on sequence ..........................................................................................................72
Motors and fans ................................................................................................................7 3
Laser/scanner system .............................................................................................................74
Pickup and feed system ..........................................................................................................75
Paper trays .......................................................................................................................76
Jam detection ...................................................................................................................77
Photosensors and switches ..............................................................................................78
Solenoid and clutches ......................................................................................................80
Printed circuit assemblies .................................................................................................82
Image-formation system ..........................................................................................................84
Image-formation process ..................................................................................................85
Latent-image-formation stage ..........................................................................................85
Developing stage ..............................................................................................................86
Transfer stage ...................................................................................................................87
Fusing stage .....................................................................................................................89
Print cartridge ...................................................................................................................93
Imaging-drum E-label .......................................................................................................94
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Introduction
This chapter presents an overview of the relationships between major components in the
printer, and includes a detailed discussion of the image-formation system. The following
systems are discussed:
● engine control system
● laser/scanner system
● pickup and feed system
● image-formation system
3
1
2
4 5
6
7
8
Figure 4-1.
22
21
1415161718192021
Cross-section of the printer
Ref Description Part number Qty
9
10
11
12
13
1 Laser/scanner RG5-6880-000CN
2 Developing cylinder (contained in print cartridge)
3 Photosensitive drum (contained in imaging drum)
4 Primary charging roller (contained in imaging drum)
5 Imaging drum Q3964A
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Ref Description Part number Qty
6 Transfer belt (contained in imaging drum)
7 Density sensor RH7-7146-000CN
8 Primary transfer roller (contained in imaging drum)
9 Transfer-belt cleaning roller (contained in imaging drum)
10 Registration shutter (contained in imaging drum)
11 Pickup roller RG5-6592-000CN
12 Tray 1 RG5-7585-000CN
13 Separation pad RF5-4012-000CN
14 Registration roller RG5-6939-000CN
15 Secondary transfer roller RF5-4067-000CN
16 Auxiliary transfer-belt cleaning roller (contained in imaging drum)
17 Feed belt (8) RB3-0063-000CN
18 Carousel RG5-7592-000CN
19 Print cartridge (several; see Table 7-2.
Accessories for part
numbers)
20 Fusing film (contained in fuser)
21 Pressure roller (contained in fuser)
22 Fuser delivery roller (contained in fuser)
23 Top output bin delivery roller RG5-7595-000CN (lower)
and RG5-6897-000CN
(upper)
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Engine control system
The engine control system coordinates all printer functions. It drives the laser/scanner
system, the image formation system, and the pickup and feed system.
The engine control system contains the following components:
● Dc controller
● High-voltage power-supply PCB
● Low-voltage power unit:
● Fuser-control circuit
● Low-voltage power-supply PCB
Figure 4-2.
Engine control system (includes the basic configuration of the printer)
Basic sequence of operation
Operation sequences are controlled by the CPU in the dc controller in the engine control
system.
of a print operation.
Table 4-1. Basic sequence of operation
Period Duration Purpose Remarks
WAIT (wait)
STBY (standby)
Table 4-1. Basic sequence of operation describes engine operations for each period
From the time the power
switch is turned on until
transfer-belt cleaning is
complete.
From the end of the WAIT or
LSTR period until either a
print command is sent from
the formatter or the power is
turned off.
Clears potential from the
drum surface and cleans the
transfer belt.
Prepares the printer to
receive print commands.
See Figure 4-3. Power-on
sequence for a complete
description of the WAIT
(power-on) period. Also see
the
General timing charts for
detailed information about
timing.
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Table 4-1. Basic sequence of operation (continued)
Period Duration Purpose Remarks
INTR (initial rotation)
PRINT (print)
LSTR (last rotation)
From the time of the print
command until detection of
the HP1 (transfer-belt homeposition detection) signal for
the first color.
From the end of the INTR
period until detection of the
transfer-belt home-position
signal for the secondary
transfer.
From the end of the PRINT
period until the main motor
stops rotating.
Prepares the photosensitive
drum for printing.
Forms the image on the
photosensitive drum and
transfers the toner image to
the transfer belt.
Transfers the toner image
on the transfer belt to the
media and delivers the
printed media.
After LSTR, the printer
returns to STBY.
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Power-on sequence
The power-on sequence is represented by the flowchart in Figure 4-3. Power-on sequence.
Figure 4-3.
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Power-on sequence
Page 89
Motors and fans
Figure 4-4. Motors and fans
2
3
1
4
5
6
Table 4-2. Motors and fans
Reference Description
1 Engaging motor
2 Developing-rotary motor
3 Toner-cartridge motor
4 Fuser motor
5 Main motor
6 Cooling fan
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Laser/scanner system
The laser/scanner system receives video signals from the dc controller, and then it converts
the signals into latent images on the photosensitive drum. The dc controller controls the
laser/scanner.
Figure 4-5.
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Laser/scanner system
Page 91
Pickup and feed system
The pickup and feed system consists of several types of feed rollers and sensors. The dc
controller drives the paper and feed system by controlling two motors, two clutches, and the
solenoid.
Two photo-interrupters (PS1 and PS711) detect media as it passes. If media does not reach
or pass each sensor within the specified time period, the dc controller determines that a jam
has occurred and alerts the video controller circuit.
The following components are identified in
●
PS1 fusing-delivery paper sensor
●
PS711 registration paper sensor
●
PS718 tray 1 (multipurpose tray) paper sensor
●
PS720 fuser wrap-jam sensor
●
DCM701 main motor
● PM702 fuser motor
●
SL92 tray 1 pickup solenoid
Figure 4-6. Pickup and feed system:
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●
CL1 registration clutch
● CL2 roller-engaging clutch
Figure 4-6.
Pickup and feed system
Paper trays
The dc controller drives the operation sequence of the paper trays. It signals the driver PCB
in optional tray 2 (250-sheet paper tray) and in optional tray 3 (500-sheet paper tray). In
optional tray 2, the printer main motor drives the tray solenoids. In optional tray 3, each
driver PCB controls the motors and solenoids in its paper tray.
The following components are identified in
●
DCM701 gear-train motor (printer)
●
SL9 pickup solenoid (optional tray 2)
76 Chapter 4 Theory of operation ENWW
Figure 4-7. Optional tray 2 (250-sheet paper tray):
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● PS716 paper sensor (optional tray 2)
● PS717 paper-feed sensor
Note
Only optional tray 2 is shown; optional tray 3 is similar.
Figure 4-7.
Optional tray 2 (250-sheet paper tray)
Jam detection
The registration sensor (PS711) and the fuser sensor (PS1) detect media that is moving
through the printer. If a jam is detected, the dc controller immediately stops the printing
process and sends a message to the video controller circuit.
A jam can be detected under any of the following conditions:
● Pickup delay jam. The leading edge of the print media does not reach the registration
sensor (PS711) within 1.1 seconds (tray 1), 1.7 seconds (optional tray 2), or 2.8 seconds
(optional tray 3).
● Pickup stationary jam. The registration clutch is on, and the registration sensor (PS711)
does not detect the trailing edge of the media within 3.4 seconds after the start of a repickup operation.
● Fuser wrap-jam. The main CPU detects media inside the fuser front sensor (PS720)
when the power is turned on or after the top cover is closed.
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● Delivery delay jam. The registration clutch is on, and the fuser-delivery sensor (PS1)
does not detect the leading edge of the media within 2.3 seconds after the start of a repickup operation.
● Delivery stationary jam. The leading edge of media does not pass the fuser-delivery
sensor (PS1) within 2.4 seconds after it has passed the registration sensor (PS711).
● Door-open jam. The main CPU detects that the top cover is open during a print operation.
● Residual jam. The main CPU detects one or more of the following conditions:
● Power is turned on.
● The printer door is closed after a jam occurrence.
● The registration sensor (PS711) and fusing-delivery sensor (PS1) detect media.
● Paper pickup failure. The sensor (PS717) near the feed roller does not detect media
moving through the printer.
Photosensors and switches
Figure 4-8.
2
1
Photosensors and switches (1 of 2)
3
4
5
78 Chapter 4 Theory of operation ENWW
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6
Figure 4-9. Photosensors and switches (2 of 2)
Table 4-3. Photosensors and switches
Reference Description
1 Tray 1 sensor
7
2 Roller-engaging sensor
3 Developing-rotary-engaging sensor
4 Fuser-delivery sensor
5 Front fuser-detection sensor
6 Door-open detection switch
7 Power switch
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Solenoid and clutches
1
2
Figure 4-10.
Solenoid
Table 4-4. Solenoid
Reference Description
1 Developing-rotary-stopper solenoid
2 Tray 1 pickup solenoid
80 Chapter 4 Theory of operation ENWW
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1
2
Figure 4-11.
Clutches
Table 4-5. Clutches
Reference Description
1 Roller-engaging clutch
2 Registration clutch
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Printed circuit assemblies
2
Figure 4-12.
1
Printed circuit assemblies (1 of 2)
3
4
5
82 Chapter 4 Theory of operation ENWW
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7
8
Figure 4-13.
10
Printed circuit assemblies (2 of 2)
Table 4-6. Printed circuit assemblies
Reference Description
1 Developing-rotary/toner-level detection PCA
2 Transfer-belt home-position detection PCA
3 Waste-toner-detection PCA
4 Density-detection PCA
5 Registration-detection PCA
6 Dc controller
9
7 Sub high-voltage power-supply PCA
8 High-voltage power-supply PCA
9 Power supply
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Image-formation system
The image-formation system, which forms a toner image on media, consists of several
interdependent systems:
●
Electrostatic latent-image-formation system
●
Developing system
●
Transfer block
●
Fuser
● Transfer belt cleaning block
●
Imaging drum (with ITB)
● Photosensitive drum
Figure 4-14.
84 Chapter 4 Theory of operation ENWW
Image-formation system
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