Start-up temperature control .............................................................................148
Print temperature control ...................................................................................149
Between-sheets temperature control ................................................................149
Temperature protective function ........................................................................................149
Protective function by the CPU .........................................................................149
Protective function by the fuser heater safety circuit ........................................149
Protective function by the thermoswitch ...........................................................150
Temperature failure detection ............................................................................................150
Start-up failure (warmup failure) .......................................................................150
Abnormal low temperature of main thermistor (no conduction) ........................150
Abnormal high temperature of main thermistor ................................................150
Abnormal low temperature of sub thermistor (no conduction) ..........................151
Abnormal high temperature of sub thermistor ..................................................151
Drive circuit abnormality ....................................................................................151
High-voltage power supply ................................................................................................151
Generation of biases .........................................................................................152
Video interface control .......................................................................................................154
Laser/scanner system ........................................................................................................................155
Laser control ......................................................................................................................156
Scanner control ..................................................................................................................157
Image formation system .....................................................................................................................159
Image formation process ...................................................................................................161
Electrostatic latent image formation block .........................................................................163
Step 1: Pre-exposure ........................................................................................163
Step 2: Primary charging ...................................................................................164
Step 3: Laser beam exposure ...........................................................................164
Development block ............................................................................................................164
Step 4: Development .........................................................................................164
Transfer block ....................................................................................................................165
Step 5: Attraction ...............................................................................................165
Step 6: Transfer ................................................................................................165
Step 7: Separation ............................................................................................166
Fusing block .......................................................................................................................166
Step 8: Fusing ...................................................................................................166
Cleaning block ...................................................................................................................167
Step 9: Drum cleaning .......................................................................................167
Print cartridges ...................................................................................................................167
Memory tag .......................................................................................................169
Cartridge presence detection .............................................................................................169
Memory tag detection ........................................................................................169
Photosensitive drum detection ..........................................................................169
Developing cylinder disengaging control ..........................................................170
ETB (electrostatic transfer/transport belt) ..........................................................................170
Transfer roller (Y, C, M) engagement/disengagement detection ......................................172
Transfer roller engagement/disengagement control ..........................................................172
Calibration and cleaning ....................................................................................................173
ETB cleaning .....................................................................................................174
Color misregistration corrective control ............................................................175
Color misregistration detection ..........................................................................................176
Image stabilization control .................................................................................................177
viii ENWW
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