3 Managing and maintenance Managing supplies.................................................................................................................................30 Life expectancies of replacement supplies...........................................................................30 Checking and ordering supplies...........................................................................................30 To check status using the control panel..............................................................30 To check and order supplies using HP Toolbox..................................................30 Storing supplies....................................................................................................................31 Replacing and recycling supplies.........................................................................................31 Replacing the print cartridges..............................................................................31 HP policy on non-HP supplies..............................................................................................31 HP anti-counterfeit Web site.................................................................................................31 Cleaning the printer...............................................................................................................................32 To clean the printer at the printer..........................................................................................32 To clean the fuser using HP Toolbox...................................................................................33 Cleaning spilled toner...........................................................................................................33 Calibrating the printer............................................................................................................................34 To calibrate the printer at the printer....................................................................................34 To calibrate the printer from the HP Toolbox........................................................................34 4 Operational theory Engine control system...........................................................................................................................36 Basic sequence of operation................................................................................................36 Power-on sequence..............................................................................................................37 Motors and fans....................................................................................................................37 Main motor failure detection.................................................................................38 Fan motor failure detection..................................................................................38 Image formation system........................................................................................................................39 Image formation process......................................................................................................41 Latent image formation........................................................................................42 Laser/scanner system..........................................................................................43 Developing stage..................................................................................................................43 Print cartridge.......................................................................................................44 Transfer belt (ETB)...............................................................................................45 Transfer stage.......................................................................................................................46 Separation stage...................................................................................................................47 Fusing stage.........................................................................................................................47 Pickup and feed system........................................................................................................................49 Manual feed slot pickup mechanism....................................................................................51 Paper feed mechanism.........................................................................................................51 Skew correction by the registration shutter..........................................................................51 Jam detection........................................................................................................................52 Solenoid, motor, and fan locations.......................................................................................53 Printed circuit assembly locations.........................................................................................53 250-sheet tray solenoid and printed circuit locations...........................................................54 Service-only tools (service only)............................................................................................................56 General timing chart..............................................................................................................56 Printer calibration..................................................................................................................57 5 Removal and replacement Overview................................................................................................................................................60 iv ENWW