Paper-path checklist...........................................................................................369 Paper-path test ..................................................................................................369 To perform a paper-path test.............................................................................370 Jams in tray 1 ....................................................................................................371 Jams in tray 2 ....................................................................................................372 Jams in tray 3 or tray 4.......................................................................................373 Jams in the paper path ......................................................................................374 Jams in the duplex path ....................................................................................374 Media transport problems ...................................................................................................................375 Multiple pages feed ............................................................................................................375 Media is wrinkled or folded.................................................................................................375 Media is skewed ................................................................................................................376 Image-formation troubleshooting ........................................................................................................377 Media-related print-quality problems .................................................................................377 Overhead transparency defects .........................................................................................378 Print-quality problems that are related to the environment................................................378 Print-quality problems that are related to jams...................................................................378 Image defects ....................................................................................................................379 Image quality .....................................................................................................379 Check the print cartridge....................................................................................380 EconoMode........................................................................................................380 Half self-test functional check ...........................................................................381 Drum-rotation functional check..........................................................................381 Image defect tables.............................................................................................................382 Repetitive-defects troubleshooting ....................................................................................400 Troubleshooting the stacker and the stapler/stacker..........................................................................402 Initial checks ......................................................................................................................402 Jam errors ..........................................................................................................................403 Stacker and stapler/stacker paper path.............................................................403 Stacker paper-path test......................................................................................404 Stapler/stacker paper-path test..........................................................................404 Paper-transport errors........................................................................................................406 Malfunction errors...............................................................................................................406 Component errors...............................................................................................................407 Printer-component locations................................................................................................................409 Main printer parts................................................................................................................409 Printer switches and sensors..............................................................................................413 Printer motors and fans......................................................................................................414 Printer PCAs.......................................................................................................................415 Accessory component locations..........................................................................................................416 500-sheet feeder main parts...............................................................................................416 500-sheet feeder switches, sensors, solenoids, and PCAs...............................................417 1,500-sheet feeder main parts............................................................................................418 1,500-sheet feeder switches, sensors, solenoids, and PCAs............................................420 Stapler/stacker stapler assembly........................................................................................421 Stacker and stapler/stacker switches and sensors............................................................422 Stacker and stapler/stacker motors and solenoids.............................................................423 Stacker and stapler/stacker PCAs......................................................................................424 Printer and accessory wiring diagrams...............................................................................................425 HP LaserJet 4200 wiring diagram .....................................................................................426 xi