Engine power supply...........................................................................................................239 Paper-feed assembly..........................................................................................................245 Tray 2 detection switch.......................................................................................................247 Paper-size-detection switch (SW102)................................................................................248 Tray 2 paper-present sensor (PS101)................................................................................249 Laser/scanner.....................................................................................................................250 Output-bin-full sensor.........................................................................................................252 ADF and scanner components............................................................................................................254 ADF assembly.....................................................................................................................254 Scanner assembly..............................................................................................................256 Scanner glass.....................................................................................................................261 Optical unit..........................................................................................................................264 Scanner bulb.......................................................................................................................268 Inverter PCA.......................................................................................................................270 Scanner fan.........................................................................................................................271 Scanner home-position sensor...........................................................................................272 Scanner-controller PCA......................................................................................................274 ADF components.................................................................................................................................275 ADF output-bin extension...................................................................................................276 ADF white mylar-backing....................................................................................................278 ADF front cover...................................................................................................................280 ADF rear cover ...................................................................................................................281 ADF left-side cover.............................................................................................................282 ADF jam-access cover and latch........................................................................................284 ADF leading-edge and paper-present sensors..................................................................286 ADF hinges.........................................................................................................................287 500-sheet feeder components.............................................................................................................289 500-sheet-feeder pickup and feed rollers...........................................................................289 500-sheet-feeder rear cover...............................................................................................290 500-sheet-feeder right cover...............................................................................................291 500-sheet-feeder front cover..............................................................................................292 500-sheet-feeder upper-left cover......................................................................................294 500-sheet-feeder left-side cover.........................................................................................295 500-sheet-feeder number-plate assembly..........................................................................296 500-sheet-cassette front cover...........................................................................................297 500-sheet-feeder PCA........................................................................................................298 500-sheet-feeder lifter-drive assembly...............................................................................299 500-sheet-feeder paper-size switch...................................................................................300 500-sheet-feeder jam-access-cover-open switch...............................................................302 7 Troubleshooting Troubleshooting process.....................................................................................................................304 Initial troubleshooting checklist...........................................................................................304 Troubleshooting checklist..................................................................................304 Troubleshooting flowchart...................................................................................................306 Power-on checks................................................................................................................308 Power-on troubleshooting overview...................................................................308 Control-panel messages......................................................................................................................310 Using the MFP help system................................................................................................310 Resolving control-panel messages.....................................................................................310 x