HP color laserjet 2550 series Manuale Di Servizio
4
Theory of operation
Chapter contents
Chapter contents .....................................................................................................................67
Introduction ..............................................................................................................................68
Engine control system .............................................................................................................70
Introduction ..............................................................................................................................68
Engine control system .............................................................................................................70
Basic sequence of operation ............................................................................................70
Power-on sequence ..........................................................................................................72
Motors and fans ................................................................................................................73
Power-on sequence ..........................................................................................................72
Motors and fans ................................................................................................................73
Laser/scanner system .............................................................................................................74
Pickup and feed system ..........................................................................................................75
Pickup and feed system ..........................................................................................................75
Paper trays .......................................................................................................................76
Jam detection ...................................................................................................................77
Photosensors and switches ..............................................................................................78
Solenoid and clutches ......................................................................................................80
Printed circuit assemblies .................................................................................................82
Jam detection ...................................................................................................................77
Photosensors and switches ..............................................................................................78
Solenoid and clutches ......................................................................................................80
Printed circuit assemblies .................................................................................................82
Image-formation process ..................................................................................................85
Latent-image-formation stage ..........................................................................................85
Developing stage ..............................................................................................................86
Transfer stage ...................................................................................................................87
Fusing stage .....................................................................................................................89
Print cartridge ...................................................................................................................93
Imaging-drum E-label .......................................................................................................94
Latent-image-formation stage ..........................................................................................85
Developing stage ..............................................................................................................86
Transfer stage ...................................................................................................................87
Fusing stage .....................................................................................................................89
Print cartridge ...................................................................................................................93
Imaging-drum E-label .......................................................................................................94
ENWW
Chapter contents
67