HP Color LaserJet Enterprise CP4020 Service Manual - Page 77
Paper feed,
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The MP-tray media-presence sensor (SR8) detects whether paper is present in the MP tray. Figure 1-37 Multipurpose tray pickup mechanism DC controller Pickup motor M13 SL2 MP tray pickup solenoid MP tray media presence sensor SR8 MP tray pickup roller MP tray separation pad Lifting plate Paper feed After the pickup operation, the paper feeds through the product and into the fuser. 1. The paper picked up from the cassette is fed to the registration unit as the pickup motor rotates. The paper picked up from the multipurpose tray is fed to the registration unit as the pickup motor rotates. The duplex model has the duplex feed clutch. The driving force of the pickup motor is transmitted to the duplex re-pickup roller by turning on the clutch. 2. The registration shutter corrects the skew-feed. 3. When the TOP sensor detects the leading edge of paper, the DC controller stops the paper so that the media sensor detects the type of paper. 4. The DC controller controls the rotational speed of the pickup motor to align the paper with the leading edge of the toner image on the ITB. 5. The ITB motor rotates the ITB. 6. The toner image on the ITB is transferred onto the paper, and the paper is fed to the fuser. ENWW Pickup, feed, and delivery system 45
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