HP Color 9850mfp Service Manual - Page 337

II UNIT EXPLANATION Q5686A/Q5687A CONVEYANCE B. Staple mode (more than 25 sheets other than extraordinarily small or large ones) Paper exit opening HP sensor (PS712) Paper exit roller motor (M707) 400mm/s 253mm/s Backward rotation [1] [1] Completion of closing of the paper exit opening [2] [2] Reverse operation of the brake 1.2.6 Paper exit opening nip control Since its rotation is slower than that of the conveyance roller, the paper exit roller releases the nip function except while in paper exit. However, when paper reaches the paper exit opening, it drives the nip moving section to nip the paper. A. Paper exit opening nip operation When paper reaches the paper exit opening, the paper exit opening solenoid (SD704) [1] drives the nip moving section [2] and presses the nip roller [4] against the main tray paper exit roller [3] to nip the paper and discharge it to the main tray [5]. The main tray paper exit sensor (PS706) [6] detects the paper being discharged. [1] [1] [5] [4] [4] [6] [2] [2] [3] B. Timing when SD704 turns on (1) Straight/sort/group mode A specified period of time after the finisher entrance sensor (PS704) detects the trailing edge of paper, the paper exit opening solenoid (SD704) turns on. (2) Staple mode A specified period of time after the completion of stapling, the paper exit opening solenoid (SD704) turns on to nip the paper. 2-7