Electrostatic discharge .....................................................................................................80 User-replaceable parts .....................................................................................................80 Required tools ...................................................................................................................80 Before performing service .......................................................................................................81 Pre-service procedures ....................................................................................................81 Parts removal order ..........................................................................................................81 Covers......................................................................................................................................82 Left-side cover...................................................................................................................82 Right-side cover.................................................................................................................84 Back cover.........................................................................................................................86 Duplexer tray.....................................................................................................................89 Top cover...........................................................................................................................90 Control panel............................................................................................................................93 Formatter..................................................................................................................................95 Laser/scanner...........................................................................................................................96 Memory-tag-reader assembly..................................................................................................97 Duplex-drive PCA.....................................................................................................................99 Fuser......................................................................................................................................101 Fan...................................................................................................................................101 Duplex-drive gears/face-down gears...............................................................................103 Duplex solenoid (SL3) (HP LaserJet 1320 Series printers only).....................................106 Fuser................................................................................................................................107 Interlock assembly.................................................................................................................117 ECU........................................................................................................................................119 Main motor.............................................................................................................................127 Pickup and feed assemblies..................................................................................................129 Transfer roller..................................................................................................................129 Registration assembly.....................................................................................................130 Main gear assembly/tray 2 pickup solenoid...........................................................................131 Print-cartridge door................................................................................................................135 Wireless communications card..............................................................................................137 7 Troubleshooting Chapter contents....................................................................................................................139 Basic troubleshooting.............................................................................................................141 Paper-handling problems ......................................................................................................144 Paper jam .......................................................................................................................144 Print is skewed (crooked) ...............................................................................................144 More than one sheet of media feeds through the printer at one time ............................144 Printer does not pull media from the media input tray ...................................................145 Printer curled the media .................................................................................................145 Printed media does not exit to the correct path ..............................................................145 Print job is extremely slow ..............................................................................................145 Paper-path troubleshooting....................................................................................................146 Solving print paper-feed problems..................................................................................146 Printed page is different than what appeared on screen ......................................................148 Garbled, incorrect, or incomplete text ............................................................................148 Missing graphics or text, or blank pages ........................................................................148 Page format is different than on another printer .............................................................149 Graphics quality ..............................................................................................................149 Status light patterns ..............................................................................................................150 Fatal error secondary messages...........................................................................................156 Accessory error secondary messages...................................................................................159 Troubleshooting postscript (PS) errors .................................................................................160 Image troubleshooting............................................................................................................161 ENWW v