Printer memory (HP Color LaserJet 5500 models) ...............................................................122
To print a configuration page ..........................................................................................122
Installing memory and font DIMMs (for HP Color LaserJet 5500 models) .....................122
Installing DDR memory DIMMs (for HP Color LaserJet 5550 models) ..........................125
Enabling memory (HP Color LaserJet 5500 models) .....................................................128
Enabling the language font DIMM (HP Color LaserJet 5550 models) ...........................128
Enabling the language font DIMM (HP Color LaserJet 5500 models) ...........................129
Checking DIMM installation (HP Color LaserJet 5500 models) .....................................129
Installing an HP Jetdirect print server card ....................................................................129
5 Theory of operation
Basic operation .....................................................................................................................135
Operation sequence .......................................................................................................135
Engine control system ...........................................................................................................137
DC controller circuit ........................................................................................................137
Motors and fans ..............................................................................................................139
Fuser power supply circuit ..............................................................................................141
Heater temperature control .............................................................................................142
Heater temperature control (HP Color LaserJet 5550 models) ......................................143
Failure detection (HP Color LaserJet 5550 models) ......................................................144
High-voltage power supply .............................................................................................144
Low-voltage power supply ..............................................................................................145
Formatter system ............................................................................................................146
PowerSave .....................................................................................................................146
Input/Output ....................................................................................................................147
Printer memory ...............................................................................................................148
Read-only memory .........................................................................................................148
Random-access memory ................................................................................................148
Firmware DIMM (HP Color LaserJet 5500 models) .......................................................148
Firmware compact flash (HP Color LaserJet 5550 models) ..........................................148
Nonvolatile memory ........................................................................................................148
PJL overview ..................................................................................................................149
PML .................................................................................................................................149
Control panel ..................................................................................................................149
Laser/scanner system ...........................................................................................................150
Scanner motor control ....................................................................................................151
Image formation system ........................................................................................................152
Image formation process ................................................................................................153
Print cartridges ................................................................................................................155
Toner level detection ......................................................................................................156
Electrostatic transfer/transport belt (ETB) unit ...............................................................160
Electrostatic latent image formation block ......................................................................161
Development block .........................................................................................................163
Transfer block .................................................................................................................164
Fusing block ....................................................................................................................165
Fuser motor speed control ..............................................................................................166
Cleaning block ................................................................................................................166
Calibration and cleaning .................................................................................................167
Color plane registration calibration .................................................................................171
Drum phase calibration ...................................................................................................172
Image stabilization control ..............................................................................................172
Pickup/feed system ...............................................................................................................175
Pickup/feed unit ..............................................................................................................178
Fuser/delivery unit ..........................................................................................................185
Duplex feed unit ..............................................................................................................186
vi ENWW
To Next Page
Loading...
