HP 8550 Service Manual - Page 727
I/O mode 79 - laserjet density sensor
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lamp, scanning adjusting 127 checking condition of 195 controlling 193 cover, removing 357 density sensor 69 diagrams 27 errors 196 flickering 485 heater, removing 357 heater, troubleshooting 505 intensity control 194 intensity detection PCB, replacing 133 life span 69, 163 part numbers 692 pre-heating control 194 recalibration 127 removing 357 replacing 132, 361 shading, effects on 208 short circuits 196 signals 80 temperature control 195 testing 95 touching, avoiding 360 turning on and off 194 voltage 194 languages codes 70 downloading firmware 138 firmware image files 135 laser faults 471, 474 safety statement 36 theory of operation 187 laser controller PCB 109 laser scanner motor theory of operation 187 LaserJet 8550 119 LaserJet 8550 MFP unique parts 119 last original, detecting 274 last-page detector 30 latches, part numbers 692 LCD backlight signal 80 contrast adjustment 232 control panel 49 CPU control 232 lifespan 163 part numbers 692 removing 346 testing 94 EN leading edges detecting 271 folding, troubleshooting 545 margins, adjusting 85, 122 leaf spring 366 leakage breaker 519 LED101 269 LED102 269 LED3, cleaning 172 LEDs current leakage 318 part numbers 692 testing 94 troubleshooting with 535 user 33, 320 left edge stop position, adjusting 147 left margin, adjusting 122 lens cleaning 166 condensation 463 diagrams 27 mount cover, removing 365 level 1 screens adjust mode 83 display mode 65 I/O mode 77 level 2 menus adjust mode 83 display mode 65 I/O mode 79 option 99 run/check mode 94 level 3 menus adjust mode 84 display mode 66 I/O mode 79 option 99 run/check mode 94 levels, service mode screens 63 levers, part numbers 692 life span, parts 163 lifter drive diagrams 663 part numbers 663 lifter motor operations 310 removing 452 voltage 314 lifter wire removing 442 tightening 451 lifter, high-capacity input (HCI) 34, 310 light conversions 214 wavelength filtering 212 light images, troubleshooting 463, 477, 479 Index 725