HP Color 9850mfp Service Manual - Page 408
Paper feed assist fan control, Mis-centring adjustment control
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II UNIT EXPLANATION PAPER FEED 1.2.3 Paper feed assist fan control Q5690A Some of the side guides (at front and rear) are provided with a fan to assist the handling of paper while is being fed. The fan turns on/off at the same timing as the paper feed motor (M101). The auto-mode has been set when the engine was shipped from the factory, and this air assist turns on when the coated paper is selected. The 25 mode DIPSW allows the mode to be switched among "ON for coated paper only," "ON for all types of paper" and "OFF at all times." [5] [6] [4] [2] [1] [3] 1.2.4 Mis-centring adjustment control In combination with the paper feed sensor (PS107), the mis-centering sensor (PS120) detects the position of paper in conveyance. The image processing section uses this information for writing so that an original to be read comes at the same position as paper. The contact-type sensor of PS120 detects the paper edge position along the main scan, and the PS107 detects the leading edge of paper to be used for correction along the sub-scan. 2-4
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