HP 4550 Service Manual - Page 378

replacement intervals 142 replacing 86 safety data sheet 37 shipping 54 status report, printing 290 transfer operations 107 Toner Cleaning Cloth, HP 78 toner density sensor (PS14) cleaning 85 operations 111 toner level sensor (PS12) 118, 119 tools, required 140 top cover release button 25 removing 144 switch assembly, removing 161 top drawer assembly, removing 163 top drawer cover, removing 149 top output bin capacity 17 locating 25 top-of-page signal 114 total page count 297 tracking color page count 296 fuser maintenance 296 page count 297 transfer maintenance 296 trailing edge, detecting 129 transfer kits life span 83 ordering 325 replacement intervals 142 replacing 89 status report, printing 290 transfer maintenance count 296 transfer operations 107 transfer plates, waste toner 109 transfer roller cleaning 78 locating 84 operations 114 removing 207 replacing 89 transparencies defects, troubleshooting 263 detection sensor (PS301) 125 HP-supported 30 ordering 326 print speed 17 printing 31 supported sizes 29 transport assembly, removing 204 Tray 1 assembly diagrams 351 capacity 29 feeding operations 124 locating 25 margins, setting 299 sensor (PS4) 124, 312 settings 274 special media handling 32 supported media 29 Tray 2 assembly diagrams 352 capacity 29 cassette feed solenoid (SL2) 123, 188 feeding operations 123 locating 25 376 Index margins, setting 299 paper size switches 123 replacing paper rollers 94 sensors 123 settings 274 supported media 29 Tray 3 assembly diagrams 353 capacity 30 connector diagrams 320 feeding operations 126 locating 25 margins, setting 299 ordering 326 paper size switches 126 replacing paper rollers 96 settings 274 supported media 30 wiring diagram 321 trays, input capacity 29 locating 25 margins, setting 299 settings 274 supported media 29 troubleshooting checklist 212 color 243 communications 268 configuration page, printing 287 control panel 271 diagnostics mode 300 event log, printing 292 flowchart 213 image defects 253 image formation system 243 paper path 237 power 216 quality 253 supplies status page, printing 290 transparencies 263 usage page, printing 291 trus head screws 141 turning off printer 139 U UEL (universal exit language) 269 unit life sensor, ITB (PS1) 114 universal exit language (UEL) 269 UNIX networks 72 unpacking 48, 49 unplugging power cord 139 upgrading firmware 98 upper drawer assembly 350 usage page, printing 291 user guides, ordering 43 V vacuuming 78 values, registration 297 variation, color 244 vector graphics 249 ventilation 20 versions drum drawers 335 printers 140 vertical banding, troubleshooting 255 vertical lines, troubleshooting 261 Vivid color map 246 C7085-90921