Service manual

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