HP 8550 Service Manual - Page 719

covers, part numbers 563 covers, removing 334 CPU 179 DC power, troubleshooting 520 diagrams 26 downloading, preparing for 137 electrical tray assembly 578 environment, operating 25, 462 exposure system 178, 188, 189 fan 234 features 23, 51 functions 51, 178 height, troubleshooting 471 horizontal registration, adjusting 124 image faults, troubleshooting 491 image processing system 200 internal components 564 inverter, part numbers 590 jams 58 life span, parts 163 locking 50 lubricants 174 main power supply 239 motor driver 589 noise filter 583 operating environment 25, 462 part numbers 558 parts, life span 163 power cord terminal assembly 569, 570, 571 power supplies, diagrams 580, 582 power supplies, part numbers 580, 582 power supplies, removing 373 power supplies, voltage 239 powering off 137 replacing parts 333 return to standard mode 139 scanner motor, removing 338 service mode 60 settings 54 specifications 23 standard mode, returning to 139 troubleshooting 460, 512 troubleshooting image faults 491 copy module controller PCB part numbers 587 removing 370 replacing 57, 129 copy speed 23 copyboard cover assembly diagrams 574 diagrams 26 part numbers 575 copyboard glass automatic document feeder (ADF) positioning 145 cleaning 164, 165 diagrams 26 original-size identification 197, 199 part numbers 689 troubleshooting 462 copying status indicator 49 copying, sequence of operations 185, 187 cord, power terminal assembly diagrams 570 terminal assembly part numbers 571 cores, ferrite part numbers 685 correcting background cancellation 213 density 229 enlargements 223 horizontal registration 124 image quality 99, 476 lines 99, 102 logarithms 216 quality, copy 121 retransfer 99, 102 shading, theory of 208 count mismatch originals 283 counter mode 111 counterfeit prevention features overview 231 troubleshooting 480 counters mode 111 soft 103 total 112 country codes 70 covers automatic document feeder (ADF) 30, 377 body (ADF) 377, 380 cleaning 164, 165 copy module, diagrams 562 copy module, identifying 333 copy module, part numbers 563 copy module, removing 334 diagrams 33 front (ADF) 377 front (HCI) 434, 435 high-capacity input (HCI), diagrams 654 high-capacity input (HCI), identifying 434 high-capacity input (HCI), part numbers 655 high-capacity input (HCI), removing 435 lower front (copy module) 333, 334 modified top, part numbers 119 part numbers 685 pulley, removing 442 rear (copy module) 333, 336 rear (HCI) 434, 436 upper (ADF) 377, 614 upper front (copy module) 333, 337 upper left (copy module) 333, 335 EN Index 717