Fusing and delivery unit ................................................................................................... 191 Loop control .................................................................................................... 191 Pressure-roller pressurization control ............................................................. 192 Duplexing unit .................................................................................................................. 193 Duplexing reverse and feed control ................................................................
194 Jam detection ................................................................................................................................... 195 Optional input trays .......................................................................................................................... 197 Paper-feeder pickup and feed operation ......................................................................... 200 Scanner component ......................................................................................................................... 202 Product boards ................................................................................................................
203 Scanner system block diagram ........................................................................................ 204 Scanner image-data path ................................................................................................ 205 Scanner power topology .................................................................................................. 206 Scanner power states ...................................................................................................... 207 Sensor topology ...............................................................................................................
208 Boards I/Os ...................................................................................................................... 211 Scanner operation flow .................................................................................................... 213 ADF .................................................................................................................................................. 217 Input tray .......................................................................................................................... 217 ADF simplex-printing operation sequence .......................................................................
217 ADF duplex-printing operation sequence ........................................................................ 218 Multifeed operation .......................................................................................................... 219 End of a scan job operation ............................................................................................. 220 Paper pick and separation operation ............................................................................... 220 Deskew ............................................................................................................................
221 6 Removal and replacement Removal and replacement strategy .................................................................................................. 224 Introduction ...................................................................................................................... 224 Required tools .................................................................................................................. 225 Types of screws ............................................................................................................... 225 Service approach .............................................................................................................
226 Before performing service ................................................................................................ 226 After performing service ................................................................................................... 226 Parts removal order ......................................................................................................... 227 Save/Restore ................................................................................................................... 227 User-replaceable parts .....................................................................................................................
228 Fuser ................................................................................................................................ 229 Transfer roller .................................................................................................................. 232 Intermediate transfer belt (ITB) ........................................................................................ 234 Tray 1 pickup and separation rollers ................................................................................ 237 Tray 2, 3, 4, and 5 pickup rollers ....................................................................................
239 Formatter ......................................................................................................................... 241 viii ENWW