5 Removal and replacement Removal and replacement strategy......................................................................................................58 Required tools .....................................................................................................................58 Before performing service....................................................................................................58 Print cartridge .....................................................................................................................59 Parts removal order ............................................................................................................60 User-replaceable parts ........................................................................................................................61 Replacing the pickup roller .................................................................................................61 Replacing the separation pad .............................................................................................64 Replacing the main input tray (paper-pickup tray assembly) ..............................................66 Replacing the output-bin extension (delivery-tray assembly) .............................................67 Covers..................................................................................................................................................68 Right-side cover...................................................................................................................68 Left-side cover.....................................................................................................................70 Rear panel and top-cover assembly....................................................................................70 Front cover...........................................................................................................................75 Internal assemblies..............................................................................................................................77 Transfer-roller assembly......................................................................................................77 Engine-power assembly......................................................................................................80 Fuser (fixing) assembly........................................................................................................82 Paper-pickup assembly.......................................................................................................84 Engine control unit (ECU) assembly....................................................................................85 Laser/scanner assembly......................................................................................................89 6 Troubleshooting Basic troubleshooting...........................................................................................................................92 Basic troubleshooting..........................................................................................................92 Reset the factory default settings (cold reset)......................................................................................94 Control-panel pages.............................................................................................................................94 Control-panel lights..............................................................................................................................95 Control-panel light patterns..................................................................................................95 Jams.....................................................................................................................................................97 Clearing jams.......................................................................................................................97 Typical media jam locations................................................................................97 Removing a jammed page..................................................................................98 Print-quality troubleshooting...............................................................................................................100 Print-cartridge problems....................................................................................................100 Checking the print cartridge..............................................................................100 To redistribute toner in the print cartridge.........................................100 Solving print-quality problems............................................................................................100 Solving paper-feed problems.............................................................................................................111 Functional checks...............................................................................................................................113 Half self-test functional check............................................................................................113 To perform a half self-test check.......................................................................113 To perform other checks...................................................................................113 Drum-rotation functional check .........................................................................................114 High-voltage-contacts check..............................................................................................115 To check the print-cartridge contacts ..............................................................115 To check the printer high-voltage contacts ......................................................116 Troubleshooting tools.........................................................................................................................117 ENWW v