Random-access memory ................................................................................ 107 DIMM slot ........................................................................................................ 107 Firmware ......................................................................................................... 107 Nonvolatile memory ........................................................................................ 108 HP Memory Enhancement technology ............................................................ 108 PJL overview ...................................................................................................................
108 PML ................................................................................................................................. 108 Control panel ................................................................................................................... 108 Scanner interface ............................................................................................................. 108 Engine-control system ...................................................................................................................... 109 DC controller PCA ...........................................................................................................
109 Motors and fans ............................................................................................................... 111 Motor and fan functions ................................................................................... 111 Ambient-temperature detection ....................................................................... 112 Engine power supply circuit ............................................................................................. 112 Fuser control ....................................................................................................................
113 Fuser over-temperature protection .................................................................. 114 High-voltage power supply .............................................................................................. 115 Low-voltage power supply .............................................................................................. 118 Overcurrent/overvoltage protection ................................................................................. 119 Toner detection ................................................................................................................
119 Cartridge detection .......................................................................................................... 119 Laser/scanner system ...................................................................................................................... 120 Laser/scanner control ...................................................................................................... 121 Image-formation system ................................................................................................................... 123 Print cartridge ..................................................................................................................
124 Cartridge memory ........................................................................................... 124 Image-formation process ................................................................................................. 125 Pickup, feed, and delivery system .................................................................................................... 127 Pickup-and-feed block ..................................................................................................... 130 Printing from tray 1 ..........................................................................................
131 Printing from tray 2 .......................................................................................... 132 Media-size detection ....................................................................... 133 Cassette pickup operation .............................................................. 133 Lifter-driver operation ..................................................................... 135 Multifeed prevention ....................................................................... 135 Distance-between-pages adjustment ............................................. 135 Media-skew prevention ...................................................................................
137 Feed-speed control ......................................................................................... 139 Fusing and reversing/delivery block ................................................................................ 140 Fusing ............................................................................................................. 140 Face-down delivery ......................................................................................... 141 Face-up delivery ..............................................................................................
142 Jam detection .................................................................................................................. 143 ENWW vii