Rear cover ....................................................................................................................... 335 Front cover ....................................................................................................................... 335 Delivery tray ..................................................................................................................... 335 Left cover ......................................................................................................................... 336 Upper cover .....................................................................................................................
336 Right-door unit ................................................................................................................. 337 Bottom cover .................................................................................................................... 339 MBM driver PCB .............................................................................................................. 340 6 Problem solving Problem-solving checklist ................................................................................................................. 343 Factors that affect performance .......................................................................................
343 Problem-solving flowchart ................................................................................................................ 344 Power-on checks .............................................................................................................................. 349 Power-on troubleshooting overview ................................................................................. 349 Formatter lights ................................................................................................................................ 351 HP Jetdirect Inside LEDs .................................................................................................
351 Heartbeat LED ................................................................................................................. 351 Fax LED ........................................................................................................................... 352 Diagrams for troubleshooting ........................................................................................................... 353 DC controller connections ................................................................................................ 353 Scanner-controller PCA connections ...............................................................................
355 General timing chart ........................................................................................................ 356 General circuit diagrams .................................................................................................. 358 Solve general device problems ........................................................................................................ 364 Control-panel message types ........................................................................................................... 367 Control-panel messages ..................................................................................................................
368 Common causes of jams .................................................................................................................. 385 Clear jams ........................................................................................................................................ 386 Clear jams from the top-cover and print-cartridge areas ................................................. 387 Clear jams from the optional envelope-feeder area ......................................................... 389 Clear jams from the tray 1 area .......................................................................................
390 Clear jams from the tray 2, 3, 4, or 5 areas ..................................................................... 392 Clear jams from the optional duplexer ............................................................................. 393 Clear jams from the output areas .................................................................................... 394 Clear jams from the fuser ................................................................................................ 396 Clear jams from the document feeder .............................................................................
398 Solve repeated jams ........................................................................................................ 400 Paper-path test ................................................................................................................ 400 Clear staple jams .............................................................................................................................. 401 Solve print-quality problems ............................................................................................................. 403 Print-quality problems associated with media ..................................................................
403 Print-quality problems associated with the environment .................................................. 403 xii ENWW