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5
Theory of operation
Chapter contents
This chapter contains the following sections.
Chapter contents ...................................................................................................................113
Basic operation .....................................................................................................................114
Operation sequence .......................................................................................................114
Power-on sequences ......................................................................................................116
Engine control system ...........................................................................................................119
DC controller PCB ..........................................................................................................119
Low-voltage power supply circuit ...................................................................................126
Low-voltage power supply circuit ...................................................................................131
Laser/scanner system ...........................................................................................................139
Laser control ...................................................................................................................140
Scanner motor control ....................................................................................................144
Image formation system ........................................................................................................146
Print process ...................................................................................................................147
Developing section .........................................................................................................156
Cartridge cleaning control ...............................................................................................163
Transfer section ..............................................................................................................164
ITB cleaning control ........................................................................................................167
Waste toner full detection ...............................................................................................167
Transfer (ITB) unit detection ...........................................................................................168
Transfer unit life detection ..............................................................................................169
ITB self-aligning mechanism ..........................................................................................170
Primary transfer roller engaging/disengaging control ....................................................171
Secondary transfer roller engaging/disengaging control ................................................172
Secondary transfer roller engaging/disengaging detection ............................................173
Color misregistration control ...........................................................................................174
Image stabilization control ..............................................................................................177
Pickup/feed system ...............................................................................................................182
Pickup/feed unit ..............................................................................................................184
Fuser/delivery unit ..........................................................................................................189
Duplexing feed unit (HP 3700 printer only) ....................................................................192
Jam detection .................................................................................................................195
Paper feeder ..........................................................................................................................197
Pickup/delivery sequence ...............................................................................................198
Paper jam detection ........................................................................................................199
ENWW Chapter contents 113