Print-cartridge door..........................................................................................................163 Rear cover and fuser cover.............................................................................................164 Front cover.......................................................................................................................165 Installing the scanner cushions.......................................................................................167 Speaker assembly...........................................................................................................168 Power supply...................................................................................................................169 Formatter and line interface unit (LIU).............................................................................171 Scanner support frame ...................................................................................................175 Engine controller unit.......................................................................................................177 Laser/scanner assembly..................................................................................................181 Main motor.......................................................................................................................182 Fuser................................................................................................................................184 Paper-pickup assembly...................................................................................................186 6 Troubleshooting Basic troubleshooting ............................................................................................................188 Control-panel messages .......................................................................................................193 Alert and warning messages ..........................................................................................193 Critical error messages ...................................................................................................201 Event-log codes...............................................................................................................204 Solving image-quality problems ............................................................................................206 Checking the print cartridge ............................................................................................206 Solving print image-quality problems .............................................................................206 Solving scanning (copying) image-quality problems ............................................................216 Repetitive image defect ruler ................................................................................................222 Solving paper-feed problems ................................................................................................223 Jams occur in the printer.................................................................................................223 Solving print paper-feed problems .................................................................................225 Jams occur in the automatic document feeder (ADF).....................................................227 Solving scanner (copier) paper-feed problems ..............................................................229 Solving problems with digital subscriber line (DSL) connections..........................................231 Connecting additional devices.........................................................................................231 Functional checks .................................................................................................................235 Control-panel test............................................................................................................235 Half self-test functional check .........................................................................................235 Drum rotation functional check ......................................................................................237 High-voltage contacts check ..........................................................................................238 Updating the firmware code...................................................................................................240 Troubleshooting tools ............................................................................................................241 Printing a configuration report, demonstration page, or menu structure ........................241 Printing all fax reports at once (HP LaserJet 3015 and 3030 only) ...............................241 T.30 protocol trace (HP LaserJet 3015 and 3030 only) .................................................241 Service-mode functions .........................................................................................................262 Secondary service menu ................................................................................................262 Developer’s menu ...........................................................................................................263 Adjusting the country/region code parameters................................................................264 Soft reset.........................................................................................................................265 NVRAM init .....................................................................................................................265 System settings for localized products............................................................................266 Printer job language (PJL) software commands ............................................................268 Main wiring ............................................................................................................................269 Component locations, HP LaserJet 3015 all-in-one .............................................................272 Component locations, HP LaserJet 3020 and 3030 all-in-one..............................................276 Component locations, HP LaserJet 3015, 3020 and 3030 printer (product base)................277 vi ENWW