Service ManualTable of ContentsProduct information17Chapter contents17Printer configurations18HP color LaserJet 2550L18HP color LaserJet 2550Ln18HP color LaserJet 2550n19Printer features20Printer overview23Hardware components23Model and serial numbers23Software components25Software and supported operating systems25Software tips26Software for Windows27Software for Macintosh28Uninstalling the printing software29Specifications31Media specifications33Supported media weights and sizes33General guidelines34Paper and print media35Printing and storage environment35Envelopes36Labels37Transparencies38Hewlett-Packard limited warranty statement39Limited warranty for the print cartridges and imaging drum40Print cartridge information41Refilled print cartridges41HP LaserJet printing supplies41HP Printing Supplies Returns and Recycling Program information41Regulatory statements43Safety statements44Laser safety statement44Canadian DOC statement44Korean EMI statement44Finnish laser statement45Installation and operation47Chapter contents47Operating environment48Interface ports49Control panel features50Understanding Supplies Status50Understanding Printer Status51Input trays53Printer output paths54Top output bin54Rear output door54Loading media55Loading tray 155Loading optional tray 256Loading optional tray 358HP LaserJet Toolbox60Supported operating systems60Supported browsers60Viewing the HP LaserJet Toolbox61Status tab61Troubleshooting tab61Alerts tab62Documentation tab62Device Settings window63Other links64Maintenance65Chapter contents65Life expectancies of supplies66User-replaceable parts68Replacing the tray 1 pickup roller and separation pad68Replacing the separation pad in optional tray 2 or in optional tray 373Cleaning the printer77Cleaning the printer77Calibrating the printer79To calibrate the printer at the printer79To calibrate the printer from the HP LaserJet Toolbox79Managing supplies80Supplies life80Checking and ordering supplies80Storing supplies81Replacing and recycling supplies81HP policy for non-HP supplies82HP fraud hotline82Theory of operation83Chapter contents83Introduction84Engine control system86Basic sequence of operation86Power-on sequence88Motors and fans89Laser/scanner system90Pickup and feed system91Paper trays92Jam detection93Photosensors and switches94Solenoid and clutches96Printed circuit assemblies98Image-formation system100Image-formation process101Latent-image-formation stage101Developing stage102Transfer stage103Fusing stage105Print cartridge109Imaging-drum E-label110Removal and replacement113Chapter contents113Introduction115Removal and replacement strategy115Electrostatic discharge115User-replaceable parts115Required tools115Before performing service117Pre-service procedures117Parts removal order118Removal and replacement119Imaging drum119Print cartridges119Fuser cover (and fuser)120Right- and left-side covers122Control panel123On-off switch125Interface cover126Formatter assemblies127Fuser motor132Dc controller133Optional tray 2 (250-sheet tray)134Carousel-engagement motor136Front lower cover137Back cover138Top cover139Top door141Air duct and fan143Laser/scanner assembly144Front cover146Density sensor and top-of-page sensor146E-label reader (for imaging-drum E-labels)148Tray 1 (multipurpose tray)149Tray 1 separation pad assembly151Gear assembly152Waste-toner sensor154Rotary-drive assembly155Top plate158Print-cartridge carousel161Aligning the carousel gears165Registration-roller assembly166Toner-catch tray167Transfer-roller plate168Transfer roller168Feed-drive shaft169ECU pan170Sub-high-voltage transformer PCA173High-voltage transformer PCA174Low-voltage PCA175Paper-top sensor176Fuser-wrap sensor177250-sheet feeder pickup roller178500-sheet feeder pickup roller179Troubleshooting183Chapter contents183Basic troubleshooting185Clearing jams187Where to look for jams187To clear jams from inside the printer187To clear jams from input areas188To clear jams from output areas190Control panel light messages192Supplies Status lights193Printer Status lights198Solving image-quality problems206Print-quality checklist206Solving image-quality problems (all print jobs)206Solving image-quality problems (color print jobs)216Resolving problems that generated messages220Messages for both Windows and Macintosh220Messages for Windows only220Resolving problems that did not generate messages222Troubleshooting checklist222Checking the network223Solving general printing problems223Solving PostScript (PS) errors228Solving common Macintosh problems229Manually rotating the print-cartridge carousel232Functional checks234Engine test234High-voltage power-supply check235Paper-path check235Service mode functions237Cold reset237NVRAM initializer237Error report238Super NVRAM initialization238Network card cold reset238Using PJL commands239Troubleshooting tools241Demo page241Configuration page241Supplies Status page242Repetitive image defects243General timing charts244Locations of connectors246Dc controller connections249Main wiring diagram250HP LaserJet Toolbox252To view the HP LaserJet Toolbox252Parts and diagrams253Chapter contents253Ordering parts and supplies254Parts254Related documentation and software254Supplies254Accessories255Assembly locations (1 of 2)257Assembly locations (2 of 2)258Covers260Internal assemblies262PCA assemblies284Alphabetical parts list286Numerical parts list294Index301Size: 10.4 MBPages: 312Language: EnglishOpen manual
