Lexmark Optra C710 Service Manual - Page 35
Paper Feed Unit, pass sensor checks the paper feed from the cassette; if paper is
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5016-001 Paper Feed Unit Operation of the paper feed unit (tray 1) When the paper cassette (tray 1) is present in the printer, a flag molded in the right side of the tray contacts the release lever rotating the paper transfer roll, allowing it to contact the paper in the tray. When a print command is sent to the printer, the paper feed clutch, attached to the paper feed roller turns on, which turns the main motor transmitting to the clutch gear magnet and the paper feed gears, causing the paper feed roller and paper transfer roller to turn. Double feed prevention The double feed prevention pad contacts the sheet bypass paper feed roller at a specific pressure. Whenever multiple sheets of paper are fed, the bottom sheet is stopped by friction of the double feed prevention pad which aids in the prevention of double feeding. Only the top sheet of paper is fed by the paper feed roller. As paper is fed to the timing roller by the paper feed roll, the paper is detected by the paper pass sensor located just ahead of the timing roller. After the paper is detected, the paper feed clutch turns off and the paper feed roller and paper feed transfer roller stop rotating. At this point the paper touches the timing roller and remains. The paper pass sensor checks the paper feed from the cassette; if paper is not detected the printer stops and a paper jam error displays. Detecting the paper Paper in the casette is detected by the paper detect sensor. When the paper is detected the sensor turns off. If paper is not detected the sensor remains off. Detecting paper level The amount of paper remaining in tray 1 is detected by the paper detect sensor. When there is enough paper in tray 1 the sensor remains off. When the level is low, less than 50 sheets, the sensor turns on and Load Paper tray 1 displays. General Information 1-11