HP Memory Enhancement technology................................................................82
PJL overview.........................................................................................................................82
PML.......................................................................................................................................82
Control panel.........................................................................................................................82
Scanner interface..................................................................................................................83
Engine-control system...........................................................................................................................84
DC controller PCA.................................................................................................................84
Motors and fans....................................................................................................................86
Motor and fan functions........................................................................................86
Ambient-temperature detection............................................................................87
Engine power supply circuit..................................................................................................87
Fuser control.........................................................................................................................88
Fuser over-temperature protection......................................................................89
High-voltage power supply...................................................................................................91
Low-voltage power supply ...................................................................................................92
Overcurrent/overvoltage protection......................................................................................94
Toner detection.....................................................................................................................94
Cartridge detection................................................................................................................94
Laser/scanner system...........................................................................................................................95
Laser/scanner control...........................................................................................................96
Image-formation system........................................................................................................................98
Print cartridge........................................................................................................................99
Cartridge memory................................................................................................99
Image-formation process....................................................................................................100
Pickup, feed, and delivery system.......................................................................................................102
Pickup-and-feed block........................................................................................................105
Printing from tray 1.............................................................................................106
Printing from tray 2.............................................................................................107
Media-size detection.........................................................................108
Cassette media-size detection.........................................108
Media-length detection.....................................................108
Media-width detection.......................................................108
Cassette pickup operation.................................................................108
Lifter-driver operation........................................................................110
Multifeed prevention..........................................................................110
Distance-between-pages adjustment................................................111
Media-skew prevention......................................................................................112
Feed-speed control............................................................................................114
Fusing and reversing/delivery block...................................................................................115
Fusing.................................................................................................................115
Face-down delivery............................................................................................115
Face-up delivery.................................................................................................116
Jam detection......................................................................................................................118
Pickup delay jam from tray 1..............................................................................118
Pickup delay jam from tray 2..............................................................................118
Pickup stationary jam.........................................................................................118
Fuser-delivery delay jam....................................................................................119
Fuser wrapping jam............................................................................................119
Fuser-delivery stationary jam when feeding regular-size media.......................119
Fuser-delivery stationary jam when feeding custom-size media.......................119
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