Cassette paper-level and paper-presence detection ...................... 186 Multifeed prevention ....................................................................... 187 Multipurpose tray pickup ................................................................................. 188 Multipurpose tray last-paper detection ........................................... 189 Paper feed ....................................................................................................... 190 Skew-feed prevention ..................................................................... 191 Paper-type detection ......................................................................
192 Feed-speed control ......................................................................... 193 Fusing and delivery unit ................................................................................................... 195 Loop control .................................................................................................... 195 Pressure-roller pressurization control ............................................................. 196 Duplexing unit .................................................................................................................. 197 Duplexing reverse and feed control ................................................................
198 Jam detection ................................................................................................................................... 199 Optional input trays .......................................................................................................................... 201 Paper-feeder pickup and feed operation ......................................................................... 204 Scanner component ......................................................................................................................... 206 Product boards ................................................................................................................
207 Scanner system block diagram ........................................................................................ 208 Scanner image-data path ................................................................................................ 209 Scanner power topology .................................................................................................. 210 Scanner power states ...................................................................................................... 211 Sensor topology ...............................................................................................................
212 Boards I/Os ...................................................................................................................... 215 Scanner operation flow .................................................................................................... 217 ADF .................................................................................................................................................. 221 Input tray .......................................................................................................................... 221 ADF simplex-printing operation sequence .......................................................................
221 ADF duplex-printing operation sequence ........................................................................ 222 Multifeed operation .......................................................................................................... 223 End of a scan job operation ............................................................................................. 224 Paper pick and separation operation ............................................................................... 224 Deskew ............................................................................................................................
225 6 Removal and replacement Removal and replacement strategy .................................................................................................. 228 Introduction ...................................................................................................................... 228 Required tools .................................................................................................................. 229 Types of screws ............................................................................................................... 229 Service approach .............................................................................................................
230 Before performing service ................................................................................................ 230 After performing service ................................................................................................... 230 Parts removal order ......................................................................................................... 231 viii ENWW