Information menu..................................................................................................................63 Paper-handling menu............................................................................................................64 Configure-device menu ........................................................................................................68 Printing submenu ................................................................................................68 Print-quality submenu .........................................................................................71 System Setup submenu ......................................................................................74 Stapler/stacker submenu ....................................................................................77 I/O submenu ........................................................................................................77 Resets submenu (HP LaserJet 4250/4350 only).................................................78 Diagnostics menu (HP LaserJet 4250/4350 only) ...............................................................80 4 Maintenance Chapter contents...................................................................................................................................81 Cleaning the printer and accessories ..................................................................................................82 Cleaning the fuser.................................................................................................................83 Running the cleaning page manually...................................................................................83 To run the cleaning page manually......................................................................83 Running the cleaning page automatically.............................................................................85 To run the cleaning page automatically...............................................................85 Cleaning spilled toner .........................................................................................................85 Performing preventive maintenance......................................................................................................86 Resetting the maintenance-kit counter (LJ 4200/4300)........................................................86 Resetting the maintenance-kit counter (LJ 4250/4350)........................................................87 Maintenance kit part numbers .............................................................................................87 Expected life of components ................................................................................................88 Maintaining the stapler unit....................................................................................................................89 To remove and replace the stapler unit................................................................................89 Loading staples.....................................................................................................................90 To load staples ....................................................................................................90 Downloading a remote firmware update................................................................................................91 Downloading the new firmware to the printer.......................................................................91 Remote firmware update through a local Windows port ......................................................92 Windows 95, Windows 98, or Windows Me ........................................................92 Windows NT 4.0, Windows 2000, Windows XP, or Windows Server 2003.........93 Remote firmware update through a Windows network.........................................................93 Remote firmware update for UNIX systems.........................................................................93 Remote firmware update using FTP on a direct network connection ..................................93 Windows operating systems ...............................................................................94 Mac operating systems.........................................................................................................95 Remote firmware update using FTP through a browser.......................................................................96 Remote firmware update using Fetch (Mac OS 8.6 and OS 9.x only) .................................................97 Remote firmware update using the HP LaserJet utility (Mac OS 8.6 and OS 9.x only)........................98 Remote firmware update using the LPR command .............................................................................99 Using HP Web JetAdmin to download the firmware to the printer......................................................100 Printer messages during firmware update..........................................................................................101 Troubleshooting a firmware update.....................................................................................................102 5 Theory of operation Chapter contents.................................................................................................................................103 Introduction .........................................................................................................................................104 v