HP 8550 Service Manual - Page 730
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operating environment copier 462 copy module 25 high-capacity input (HCI) 32 internal 69 option menu 98 options counter 112 feeder 115 test print 110 ordering consumables 41 documentation and software 40 FRUs 41 original delivery tray diagrams 30 operations 266 original detection signal (EMPS) 269 original exposure system, checking 480 original frame erase, defined 51 original guide sequence of operations 256 original sensor cleaning 170 original set indicator diagrams 30 functions 58, 269 original size sensors theory of operation 198 original tray identifying 377 originals auto matching 51 black 198 books 198 count mismatch 283 default detection sizes 273 delivering 266 density 462 detecting 269, 271 direction detection 271, 272 double-sided 252 improper placement 282 inspecting 121 jams 58 jams, preventing 146 last, detecting 274 number copied 284 overriding stopper plate 283 pick-up failures 283 poor quality 121 position shifting 225 positioning 145 quality, effects on copying 121 reduced page composition 255, 263 resetting 284 728 Index reversal operation 261 second pick-up 259 settings 121 size detection 115, 271 size sensors 80 size-detection, theory of 197, 199 skew adjustments 142 small size 268 specifications for 29 text 204 top pick-up mode 251, 256, 257 tray capacity 75 troubleshooting 462 types of 23 width-detection volume, mounting 383 wrong size 75, 283 original-size sensors theory of operation 199 original-width detecting volume, mounting 383 original-width-detecting variable resistor (VR1), adjusting 157 out-of-paper sensor (PS3) 307 output blocks 201 output masking 221 output trays double-sided original mode 252 output values RGB 67, 68 outputs deck controller PCB 306, 321 reader controller PCB circuitry 180 overcurrent protection accessory power supply PCB 238 automatic document feeder (ADF) 285 belt motor 278 copy module 235 high-capacity input (HCI) power supply 314 troubleshooting 520, 521 overheating prevention copy module fan 234 scanner motor 192 overseas customer support 46 P page separate function 51 page tiling 51 pages per minute 23 paper automatic selection 51, 197 default detection sizes 273 detecting originals 269, 271 direction detection 271, 272 high-capacity input (HCI) 307 lower guide assembly 638 out-of-paper sensor 307 positioning 463 EN