HP Color 9850mfp Service Manual - Page 290

II UNIT EXPLANATION PAPER FEED 1.2.2 Double sided original mode Q3228A A. Original feeding operation Refer to "A. Original feeding operation" of "1.2.1 Single sided original mode" as the original feeding operation is the same. B. Original surface scanning and conveyance operation Refer to "B. Original scanning and conveyance operation" of "1.2.1 Single sided original mode" as the surface scanning and conveyance operation are the same. C. Original reverse/conveyance operation The reverse system is driven by the reverse/paper exit motor (M303). The conveyance path is switched by the paper exit solenoid (SD301) and reverse solenoid (SD302). At this time, SD301 turns OFF and SD302 turns ON. Original from conveyance section is wounded around the reverse roller, guided by the reverse guide which is ON, and returned to the conveyance section getting under the conveyance roller. After the reverse sensor (PS305) turns ON, both the conveyance motor (M302) and M303 stop after the specified time. At the same time, M302 starts reversing, turns M303 ON, and returns the reversed original to the conveyance section to be scanned. M303 stops at the specified time after PS305 turns OFF. [5] [7] [2] [1] [5] [1] Paper exit guide (at OFF) [2] Reverse guide (at ON) [3] Reverse roller [4] Paper [6] [4] [3] [5] Conveyance direction [6] Reverse sensor (PS305) [7] Conveyance roller 2-10