HP 8550 Service Manual - Page 729
N, O, MS1 ADF switch 279
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Page 729 highlights
MISC-P (printer unit) 95 MISC-R (reader unit) 95 misfeeds improper gap adjustment 159 MJ (text detection) signal chromatic identification 214 theory of operation 211 model numbers 35 modes adjust 83 AE 84, 204 anti-see-through 213 background omission 213 counter 111 display 65 double-sided original 252 feeder 114 full color 50 I/O 77 ID 50 ITD cleaning rotation 99, 100 low power 235 mono-color 50 photo 109 reduced page composition 255, 263 run/check 93 separation belt cleaning 115 service 60 standard 54 standard, returning to 139 test print 108 text 109 text/photo/map 89 user 49 modified top cover assembly, part numbers 119 motor driver, copy module diagrams 589 part numbers 589 motors automatic document feeder (ADF) 249, 286 automatic document feeder (ADF), removing 387, 452 belt 249 belt drive assembly 634, 635 belt, adjusting tension 391 belt, control 277 belt, removing 389 delivery 249, 267 delivery, removing 394 drive pulses, scanner motor 192 driver diagrams 589 driver part numbers 589 feed, troubleshooting 542 feeder 249 feeder, removing 387, 452 high-capacity input (HCI) 316 laser scanner, theory of operation 187 lifter 310 lifter, removing 452 paper feed, diagrams and part numbers 632 part numbers 693 pick-up 249, 256, 275 pick-up, high-capacity input (HCI) 307 pick-up, removing 385, 452, 453 scanner 191 scanner, removing 338 scanner, troubleshooting 525 sensors 81 mounting original-width-detection volume 383 ROM DIMMs 342 mounting hardware automatic document feeder (ADF) 606 high-capacity input (HCI) 653 part numbers 693 MOVE signal 192 moving the copier powering off 177 procedures for user 177 MS1 (ADF switch) 279 MS1 (open/closed switch) adjustments 151 MSDS (Material Safety Data Sheet) 43 multifeeder jams in 73 troubleshooting 544 N navigating service mode screens 63 networks, troubleshooting 457 noise copy module 25 noise filter diagrams 583 part numbers 583 non-HP components 457 non-image width, adjusting 122 numbers model 35 originals copied 284 phone 40 serial 35 numerical list, part numbers 672 nuts, part numbers 694 O odd/even bit synthesis 203 offset level, RGB 68 online support 40 opacity, guidelines for 29 EN Index 727