HP LaserJet 2550 Service Manual

hp color LaserJet 2550 printer

service

hp color LaserJet 2550 series printer

Service Manual

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.

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 .................................................................................................................	22
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 ................................................................................................................	73
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
Rightand 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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1	Product information

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 .................................................................................................................	22
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® level 3 emulation.

●Trays. The printer comes with a multipurpose tray (tray 1) that holds up to 125 sheets of 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 Supported media weights and sizes for more information.

●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.)

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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 configurations

3

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	● 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.
Excellent print quality	● 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.
Ease of use	● Few supplies to order. Supplies are easy to
	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.
Expandability	● Optional tray 2. (Included with the 2550n
	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.

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Feature	HP color LaserJet 2550 series printer
Flexible paper handling	● 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.
Printer driver features	● 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

Interface connections

●Includes 35 built-in PS language fonts.

●The printer automatically determines and 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 To use
	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.

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Printer overview

Hardware components

Before using the printer, familiarize yourself with the parts of the printer.

7

1

6

5

2

4

3

1Top (face-down) output bin

2Power switch

3Optional tray 3

4Optional tray 2 (included with HP color LaserJet 2550n model)

5Tray 1

6Top cover

7Control panel

7

12 8

11

9

10

7Control panel

8Interface ports *

9Optional tray 2

10Optional tray 3

11Power connector

12Rear (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

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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 Related documentation and software.

The printer supports the following operating systems:

●Microsoft® Windows® 98, Windows 2000, Windows Millennium Edition (Me), and Windows XP

●Windows NT® 4.0 (driver only, other printer software is not available)

●Macintosh OS 9.1, 9.2, 9.3, and OS X v.10.1 and later

●UNIX®, Linux, and OS/2 (limited functionality)

The following tables list the software that is available for your operating system.

Table 1-1. HP color LaserJet 2550 series printer software

Feature	Windows	Windows	Macintosh	Macintosh	UNIX®,	OS/2
	98, Me	2000 and	OS 9.1,	OS X v.	Linux
		XP	9.2, and 9.3	10.1 and
				later
Windows
Installer
PCL 6
printer driver
PS printer
driver
HP Web		1
Jetadmin
software
HP				2

HP LaserJet Toolbox software

Macintosh

Installer

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Table 1-1. HP color LaserJet 2550 series printer software (continued)

Feature	Windows	Windows	Macintosh	Macintosh	UNIX®,	OS/2
	98, Me	2000 and	OS 9.1,	OS X v.	Linux
		XP	9.2, and 9.3	10.1 and
				later

Macintosh PostScript printer description (PPD) and printer dialog extensions (PDE)

IBM drivers

Model scripts

1

3

1Available on the HP Web site.

2HP LaserJet Toolbox software support for Macintosh OS X, v. 10.2 or later. 3Available on the HP Web site. Not specific to this printer.

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.

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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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Note

Note

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

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.

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 dropdown 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.

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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.

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