HP LaserJet M4345 - Multifunction Printer - 1 Device basics

Bottom cover ..................................................................................................................... 342
Stapler unit ........................................................................................................................ 343
Jogger unit ........................................................................................................................ 344
Stapler/stacker driver PCB ............................................................................................... 348
3-bin mailbox components ................................................................................................................. 350
Rear cover ........................................................................................................................ 350
Front cover ........................................................................................................................ 350
Delivery tray ...................................................................................................................... 350
Left cover .......................................................................................................................... 351
Upper cover ...................................................................................................................... 351
Right-door unit .................................................................................................................. 352
Bottom cover ..................................................................................................................... 354
MBM driver PCB ............................................................................................................... 355
6 Problem solving
Problem-solving checklist .................................................................................................................. 359
Factors that affect performance ........................................................................................ 359
Problem-solving flowchart ................................................................................................................. 360
Power-on checks ............................................................................................................................... 364
Power-on troubleshooting overview ................................................................................. 364
Formatter lights .................................................................................................................................. 366
HP Jetdirect Inside LEDs .................................................................................................. 366
Heartbeat LED .................................................................................................................. 366
Fax LED ............................................................................................................................ 367
Diagrams for troubleshooting ............................................................................................................ 368
DC controller connections ................................................................................................. 368
Scanner-controller PCA connections ................................................................................ 370
General timing chart ......................................................................................................... 371
General circuit diagrams ................................................................................................... 37
3
Solve general device problems ......................................................................................................... 379
Control-panel message types ............................................................................................................ 382
Control-panel messages .................................................................................................................... 383
Common causes of jams ................................................................................................................... 399
Clear jams .......................................................................................................................................... 400
Clear jams from the top-cover and print-cartridge areas .................................................. 401
Clear jams from the optional envelope-feeder area ......................................................... 403
Clear jams from the tray 1 area ........................................................................................ 405
Clear jams from the tray 2, 3, 4, or 5 areas ...................................................................... 406
Clear jams from the optional duplexer .............................................................................. 408
Clear jams from the output areas ..................................................................................... 409
Clear jams from the fuser ................................................................................................. 410
Clear jams from the document feeder .............................................................................. 413
Solve repeated jams ......................................................................................................... 414
Paper-path test ................................................................................................................. 415
Clear staple jams ............................................................................................................................... 416
Solve print-quality problems .............................................................................................................. 418
Print-quality problems associated with media .................................................................. 418
Print-quality problems associated with the environment .................................................. 418
Print-quality problems associated with jams ..................................................................... 418
Overhead transparency defects ........................................................................................ 418
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