HP 2100 Service Manual - Page 97

Paper Pick and Feed System When the Formatter sends a print command to the Engine Controller Assembly, the main motor (M1001) and scanner motor start rotating and the fusing heater temperature control starts. The paper feed system automatically picks print media from either Tray 1, Tray 2, or Tray 3 if installed and delivers it to the registration roller. Before the media reaches the registration roller, the separation pad separates any excess sheets of media and the registration shutter corrects the media's skew. After the top-of-page sensor (PS502) detects the leading edge of the page, the Engine Controller Assembly sends a signal (BD) to the Formatter. This signal functions as a synchronization between the Controller Assembly and the Formatter. This synchronization allows the leading edge of the image on the photosensitive drum to match the leading edge of the page. After the transferring stage of the image formation process, the paper is fed to the fusing assembly by the feed belts. The delivery sensor (PS503) detects the exiting paper, which is usually fed to the top or rear output bin. Figure 5-15 Paper Feed System C4170-90959 Paper Pick and Feed System 87