Fuser motor failure detection ........................................................................... 150 ETB motor failure detection ............................................................................. 150 Upper exhaust fan failure detection ................................................................. 150 Cartridge fan failure detection .......................................................................... 150 Delivery fan failure detection ............................................................................ 150 Power supply fan failure detection ...................................................................
150 Duplexer fan failure detection .......................................................................... 151 Low-voltage power supply ................................................................................................ 151 Fuser control circuit .......................................................................................... 151 Low-voltage power supply circuit ..................................................................... 153 Protective functions ......................................................................... 154 Safety ..............................................................................................
155 Sleep mode ..................................................................................... 155 Power supply recognition ................................................................ 155 Heater temperature control ............................................................................................... 155 Initial rotation temperature control ................................................................... 156 Start-up temperature control ............................................................................ 156 Print temperature control .................................................................................
157 Between-sheets temperature control ............................................................... 157 Temperature protective function ....................................................................................... 157 Protective function by the CPU ........................................................................ 157 Protective function by the fuser heater safety circuit ....................................... 157 Protective function by the thermoswitch .......................................................... 158 Temperature failure detection ...........................................................................................
158 Start-up failure (warmup failure) ...................................................................... 158 Abnormal low temperature of main thermistor (no conduction) ....................... 158 Abnormal high temperature of main thermistor ............................................... 158 Abnormal low temperature of sub thermistor (no conduction) ......................... 159 Abnormal high temperature of sub thermistor ................................................. 159 Drive circuit abnormality ...................................................................................
159 High-voltage power supply ............................................................................................... 159 Generation of biases ........................................................................................ 160 Video interface control ...................................................................................................... 162 Laser/scanner system ....................................................................................................................... 163 Laser control .....................................................................................................................
164 Scanner control ................................................................................................................. 165 Image formation system .................................................................................................................... 167 Image formation process .................................................................................................. 169 Electrostatic latent image formation block ........................................................................ 171 Step 1: Pre-exposure ....................................................................................... 171 Step 2:
Primary charging ................................................................................. 172 Step 3: Laser beam exposure .......................................................................... 172 Development block ........................................................................................................... 172 Step 4: Development ........................................................................................ 172 Transfer block ................................................................................................................... 173 Step 5:
Attraction .............................................................................................. 173 Step 6: Transfer ............................................................................................... 173 Step 7: Separation ........................................................................................... 174 Fusing block ...................................................................................................................... 174 Step 8: Fusing .................................................................................................. 174 viii ENWW