Solenoids ........................................................................................................ 119 Clutches .......................................................................................................... 120 Switches .......................................................................................................... 120 Sensors ........................................................................................................... 121 Motors and fans ..............................................................................................
122 High-voltage power supply .............................................................................................. 123 Low-voltage power supply ............................................................................................... 125 Overcurrent/overvoltage protection ................................................................. 126 Safety .............................................................................................................. 126 Voltage detection ............................................................................................ 126 Sleep (powersave) mode ................................................................................
126 Low-voltage power supply failure .................................................................... 126 Fuser (fixing) control ........................................................................................................ 127 Fuser (fixing) temperature-control circuit ........................................................ 128 Fuser (fixing) over-temperature protection ...................................................... 128 Fuser (fixing)-failure detection ......................................................................... 129 Laser/scanner system ......................................................................................................................
131 Image-formation system ................................................................................................................... 133 Image-formation process ................................................................................................. 134 Step 1: Pre-exposure ...................................................................................... 135 Step 2: Primary charging ................................................................................. 135 Step 3: Laser-beam exposure ......................................................................... 136 Step 4:
Development ....................................................................................... 136 Step 5: Primary transfer .................................................................................. 136 Step 6: Secondary transfer ............................................................................. 137 Step 7: Separation .......................................................................................... 138 Step 8: Fusing ................................................................................................. 138 Step 9: ITB cleaning ........................................................................................ 139 Step 10:
Drum cleaning ................................................................................... 139 Print cartridge .................................................................................................................. 139 Developing-roller engagement and disengagement ........................................................ 141 Intermediate transfer belt (ITB) unit ................................................................................. 142 Primary-transfer-roller engagement and disengagement ................................ 143 ITB cleaning ....................................................................................................
144 Calibration ........................................................................................................................ 145 Color-misregistration control ........................................................................... 146 Image-stabilization control .............................................................................. 147 Pickup, feed, and delivery system .................................................................................................... 148 Pickup-and-feed unit ........................................................................................................
151 Cassette pickup ............................................................................................... 151 Cassette-presence detection .......................................................... 153 Cassette lift operation ..................................................................... 153 Cassette paper-presence detection ................................................ 154 Multifeed prevention ....................................................................... 155 vi ENWW