Installing memory and font DIMMs (for HP Color LaserJet 5500 models) .....................116
Installing DDR memory DIMMs (for HP Color LaserJet 5550 models) ..........................119
Enabling memory (HP Color LaserJet 5500 models) .....................................................122
Enabling the language font DIMM (HP Color LaserJet 5550 models) ...........................122
Enabling the language font DIMM (HP Color LaserJet 5500 models) ...........................123
Checking DIMM installation (HP Color LaserJet 5500 models) .....................................123
Installing an HP Jetdirect print server card ....................................................................123
5 Theory of operation
Basic operation .....................................................................................................................129
Operation sequence .......................................................................................................129
Engine control system ...........................................................................................................131
DC controller circuit ........................................................................................................131
Motors and fans ..............................................................................................................133
Fuser power supply circuit ..............................................................................................135
Heater temperature control .............................................................................................136
Heater temperature control (HP Color LaserJet 5550 models) ......................................137
Failure detection (HP Color LaserJet 5550 models) ......................................................138
High-voltage power supply .............................................................................................138
Low-voltage power supply ..............................................................................................139
Formatter system ............................................................................................................140
PowerSave .....................................................................................................................140
Input/Output ....................................................................................................................141
Printer memory ...............................................................................................................142
Read-only memory .........................................................................................................142
Random-access memory ................................................................................................142
Firmware DIMM (HP Color LaserJet 5500 models) .......................................................142
Firmware compact flash (HP Color LaserJet 5550 models) ..........................................142
Nonvolatile memory ........................................................................................................142
PJL overview ..................................................................................................................143
PML .................................................................................................................................143
Control panel ..................................................................................................................143
Laser/scanner system ...........................................................................................................144
Scanner motor control ....................................................................................................145
Image formation system ........................................................................................................146
Image formation process ................................................................................................147
Print cartridges ................................................................................................................149
Toner level detection ......................................................................................................150
Electrostatic transfer/transport belt (ETB) unit ...............................................................154
Electrostatic latent image formation block ......................................................................155
Development block .........................................................................................................157
Transfer block .................................................................................................................158
Fusing block ....................................................................................................................159
Fuser motor speed control ..............................................................................................160
Cleaning block ................................................................................................................160
Calibration and cleaning .................................................................................................161
Color plane registration calibration .................................................................................165
Drum phase calibration ...................................................................................................166
Image stabilization control ..............................................................................................166
Pickup/feed system ...............................................................................................................169
Pickup/feed unit ..............................................................................................................172
Fuser/delivery unit ..........................................................................................................179
Duplex feed unit ..............................................................................................................180
500-sheet paper feeder .........................................................................................................181
Pickup and feed operations ............................................................................................181
vi ENWW
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