HP LaserJet 4345mfp Series Service Manual - ENWW

Accessory lights for the 3-bin mailbox and stapler/stacker.................................................................332Accessory lights .................................................................................................................332Formatter lights....................................................................................................................................333Copy-board LED.................................................................................................................333HP Jetdirect LEDs...............................................................................................................333Heartbeat LED....................................................................................................................334Fax LED..............................................................................................................................334Jams....................................................................................................................................................335Clearing jams from the top-cover and print-cartridge areas...............................................337Clearing jams from the optional envelope-feeder area......................................................339Clearing jams from the tray 1 area.....................................................................................341Clearing jams from the tray 2, 3, 4, or 5 areas...................................................................343Clearing jams from the optional duplexer...........................................................................345Clearing jams from the output areas..................................................................................347Clearing jams from the fuser...............................................................................................349To clear jams from the fuser..............................................................................349Clearing jams from the ADF...............................................................................................353Clearing staple jams...........................................................................................................354Solving repeated jams........................................................................................................356Causes of persistent jams..................................................................................................357Jams in the top-cover and print-cartridge area..................................................357Jams in the envelope-feeder area and the tray 1 area......................................358Jams in the tray 2 area and the optional 500-sheet feeder areas.....................358Jams in the duplexing area................................................................................359Jams in the output area......................................................................................359Jams in the fuser................................................................................................361Jams in the ADF.................................................................................................361Using the paper-path test...................................................................................................362Using the scanner tests......................................................................................................362Image-formation troubleshooting.........................................................................................................363Media-related print-quality problems..................................................................................363Overhead transparency defects..........................................................................................364Print-quality problems that are related to the environment................................................364Print-quality problems that are related to jams...................................................................364Image-defect examples......................................................................................................365Light print (partial page) ....................................................................................367Light print (entire page) .....................................................................................368Specks or dots ..................................................................................................369Dropouts ............................................................................................................370Lines ..................................................................................................................372Horizontal lines...................................................................................................373Gray background ...............................................................................................374Loose toner or toner smear ...............................................................................375Repeating defects and repeating images .........................................................376Misformed characters ........................................................................................377Page skew..........................................................................................................378Curl or wave ......................................................................................................379Wrinkles or creases ...........................................................................................380Vertical white lines ............................................................................................381Horizontal white lines.........................................................................................382xi