HP 8550 Service Manual - Page 735
S, run/check mode
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Page 735 highlights
reversal operation 261 reversal sensor (S8) 279 reverse distance, scanner motor 191 reversing guide removing 419 reversing plate removing 412 reversing roller diagrams 31 operations 261 reversing roller drive belt, removing 398 RF assembly diagrams 616 part numbers 617, 621, 625, 629 RGB adjustment 94 color correction, theory of 212 conversions 214 gradation test 473 offset levels 68 output values 67 position matching 210 ratios 84 shading target values 67, 68 right angles, correcting 124, 471 right margin adjusting 122 right paper delivery assembly diagrams 630 part numbers 631 right upper cover open sensor (PS1) 310 rings, heater 361 rings, part numbers 698 rods, part numbers 699 rollers cassette pick-up, replacing 543 cleaning 167 delivery, removing 414, 416 delivery/reversing, removing 407 diagrams 31 diameters 482 feed, removing 399, 441 feed, replacing 543 high-capacity input (HCI) 307 image intervals 482 life span 163 part numbers 699 pick-up, removing 396, 440 registration, removing 402 registration, troubleshooting 544 sensors 81 separation, diagrams 640 separation, part numbers 641 separation, removing 441 troubleshooting 482 EN ROM DIMM, mounting 342 DIMM, removing 340 updating 138 version 66, 139 version display 138 rotation, scanner motor 191 routing scanner drive cable 347 run/check mode menus 93 S S address 227, 228 S4 (upper cover sensor) 279 safety laser statement 36 save power key 50 saving power 53 saving settings 95, 97 scanner directions, scanning 222 faults 470 home position sensor 190, 504 read addresses 227 sensors 190, 504 theory of operation 190 scanner drive cable routing 347 scanner motor circuitry 191 driver PCB, removing 339 overheating prevention 192 removing 338 troubleshooting 525 scanner rail cleaning 525 lubricating 174 screen contrast dial 49 screens adjust mode 83 display mode 65 error 76 initial service mode 63 jams 76 levels 63 navigating 63 run/check mode 93 service mode, navigating 63 test print mode 109 screw/ring kits, part numbers automatic document feeder (ADF) 602 copy module 558 high-capacity input (HCI) 650 stand assembly 555 Index 733