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Installing memory and font DIMMs .........................................................................................79
Enabling memory ..............................................................................................................83
Enabling the language font DIMM (HP color LaserJet 3700 only) ...................................83
Checking DIMM installation (HP color LaserJet 3700 only) .............................................84
Installing an HP Jetdirect print server card in the HP color LaserJet 3700 series printer ......85
To install the HP Jetdirect print server card .....................................................................85
Installing an HP Jetdirect en3700 external print server ..........................................................88
4 Printer maintenance
Chapter contents .....................................................................................................................91
Cleaning the printer and accessories ......................................................................................92
Cleaning spilled toner .......................................................................................................92
Managing supplies ..................................................................................................................94
Supplies life ......................................................................................................................94
Approximate replacement intervals for supplies for the HP Color LaserJet 3500
series printer ..................................................................................................................94
Approximate replacement intervals for supplies for the HP Color LaserJet
3550/3700 series printer ................................................................................................94
Locating supplies and parts ....................................................................................................96
Replacing supply items ...........................................................................................................97
Replacing the transfer unit ................................................................................................99
Replacing the fuser and pickup roller .............................................................................103
5 Theory of operation
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
ENWW Conventions vii