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
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