HP Color 9850mfp Service Manual - Page 117
Up/down plate control, When the paper feed tray 1 is pulled out
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hp Color 9850mfp 8.2.2 Up/down plate control PAPER FEED TRAY /1 TO /3 The up/down plate in the paper feed tray is driven by the wire. When the paper feed tray 1 is set to the engine, the tray up drive motor 1 (M40) of the engine starts to rotate. As a result, the wire is wound around the drive pulley and the up/down plate goes up. When the tray upper limit sensor 1 (PS30) detects the upper limit of paper, M40 turns off. When the amount of paper gets reduced as a result of the passage of paper, a no paper detection is made by the PS30. At this time, M40 keeps on until the PS30 detects the upper limit of paper again. Accordingly, paper is lifted up to the fixed level at all times. When the paper feed tray 1 is pulled out, the coupling is released from the drive section and the up/down plate goes down by its own weight. II UNIT EXPLANATION 2-43
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