Switches .......................................................................................................... 145 Sensors ........................................................................................................... 146 Motors and fans .............................................................................................. 147 Fuser control .................................................................................................................... 149 Fuser temperature-control circuit .................................................................... 151 Fuser over-temperature protection ..................................................................
152 Fuser-failure detection .................................................................................... 153 Fuser identification .......................................................................................... 153 Fuser-life detection .......................................................................................... 154 Relay-failure detection ..................................................................................................... 154 Low-voltage power supply ...............................................................................................
154 Overcurrent/overvoltage protection ................................................................. 155 Safety .............................................................................................................. 155 Voltage detection ............................................................................................ 155 Sleep (powersave) mode ................................................................................ 155 High-voltage power supply ..............................................................................................
155 Laser/scanner system ...................................................................................................................... 158 Image-formation system ................................................................................................................... 160 Image-formation process ................................................................................................. 161 Step 1: Pre-exposure ...................................................................................... 162 Step 2: Primary charging ................................................................................. 162 Step 3:
Laser-beam exposure ......................................................................... 163 Step 4: Development ....................................................................................... 163 Step 5: Primary transfer .................................................................................. 164 Step 6: Secondary transfer ............................................................................. 164 Step 7: Separation .......................................................................................... 165 Step 8: Fusing ................................................................................................. 165 Step 9:
ITB cleaning ........................................................................................ 166 Step 10: Drum cleaning ................................................................................... 166 Print cartridge .................................................................................................................. 167 Imaging drum ................................................................................................................... 168 Developing roller engagement and disengagement ........................................ 170 Intermediate transfer belt (ITB) unit .................................................................................
171 Primary-transfer-roller engagement and disengagement ................................ 171 ITB unit detection ............................................................................................ 173 Secondary-transfer-roller unit .......................................................................................... 175 Calibration ........................................................................................................................ 175 Color-misregistration contol ............................................................................ 176 Image stabilization control ...............................................................................
177 Pickup, feed, and delivery system .................................................................................................... 178 Pickup-and-feed unit ........................................................................................................ 181 Cassette pickup ............................................................................................... 183 Cassette paper-size and cassette-presence detection ................... 183 Cassette lift operation ..................................................................... 185 ENWW vii