B245/B276/B277/B268/B269 Service Manual 18-Jan-06
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Development Bias .....................................................................................................229
Toner Supply.............................................................................................................. 230
Toner Supply Mechanism .......................................................................................... 231
Toner Density Control ................................................................................................231
Toner Supply in Abnormal Sensor Conditions............................................................ 235
Toner Near End/End Detection and Recovery ........................................................... 236
Drum Cleaning and Toner Recycling............................................................................. 238
Drum Cleaning...........................................................................................................238
Toner Recycling ......................................................................................................... 239
Paper Feed ...................................................................................................................240
Overview....................................................................................................................240
Paper Feed Drive Mechanism ................................................................................... 241
Paper Feed and Separation Mechanism ................................................................... 241
Paper Lift Mechanism................................................................................................ 242
Paper End Detection .................................................................................................242
Paper Size Detection................................................................................................. 243
Side Fences............................................................................................................... 245
Paper Registration..................................................................................................... 245
Image Transfer and Paper Separation ..........................................................................247
Overview....................................................................................................................247
Image Transfer Current Timing .................................................................................. 248
Transfer Roller Cleaning............................................................................................ 249
Paper Separation Mechanism ...................................................................................250
Image Fusing and Paper Exit ........................................................................................ 251
Overview....................................................................................................................251
Fusing Unit Drive and Release Mechanism............................................................... 252
Fusing Entrance Guide Shift...................................................................................... 253
Pressure Roller.......................................................................................................... 254
Fusing Temperature Control ...................................................................................... 254
Overheat Protection................................................................................................... 256
Duplex Unit....................................................................................................................258
Overall .......................................................................................................................258
Drive Mechanism....................................................................................................... 259
Basic operation.......................................................................................................... 259
Feed In and Exit Mechanism ..................................................................................... 262
Energy Saver Modes of Basic Machines....................................................................... 263
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