Main motor ....................................................................................................................... 190 Fuser ................................................................................................................................ 192 Paper-pickup assembly ................................................................................................... 194 6 Troubleshooting Troubleshooting process .................................................................................................................. 196 Troubleshooting checklist ................................................................................................
196 Control-panel messages .................................................................................................................. 199 Alert and warning messages .......................................................................................... 199 Alert and warning message tables .................................................................. 199 Critical error messages .................................................................................................... 205 Critical error message-tables ..........................................................................
205 Event-log codes ............................................................................................................... 209 Jams ................................................................................................................................................. 211 Causes of jams ................................................................................................................ 211 Tips to avoid jams ........................................................................................................... 211 Where to look for jams .....................................................................................................
212 Print cartridge area .......................................................................................................... 212 Input trays ........................................................................................................................ 214 Output bin ........................................................................................................................ 215 Solving print paper-feed problems ................................................................................... 216 Paper-feed solutions, printing .........................................................................
216 Jams occur in the automatic document feeder (ADF) ..................................................... 218 Solving ADF paper-feed problems .................................................................................. 221 Paper-feed solutions, scanning/copying ......................................................... 221 Print image-quality problems ............................................................................................................ 223 Checking the print cartridge ............................................................................................ 223 To redistribute the toner in the print cartridge .................................................
223 Solving print image-quality problems ............................................................................... 224 Print image-quality solutions ........................................................................... 224 Scan/copy image-quality problems ................................................................................................. 232 Scan/copy image-quality solutions .................................................................................. 232 ADF problems ..................................................................................................................................
239 Fax troubleshooting (HP LaserJet 3050/3055 all-in-one) ................................................................. 240 General fax troubleshooting ............................................................................................. 240 Fax receive troubleshooting ............................................................................................. 242 Fax send troubleshooting ................................................................................................ 244 DSL problems ..................................................................................................................
245 PABX line problems ........................................................................................ 245 Control-panel-display problems ........................................................................................................ 246 Functional checks ............................................................................................................................. 247 Control-panel test ............................................................................................................ 247 Half self-test functional check .........................................................................................
247 To perform a half self-test check ..................................................................... 248 To perform other checks ................................................................................. 248 Drum-rotation functional check ....................................................................................... 248 High-voltage contacts check ............................................................................................ 249 To check the print-cartridge contacts ............................................................ 249 To check the high-voltage connector pins ......................................................
250 Service-mode functions .................................................................................................................... 251 viii ENWW