HP 3015 Service Manual - Page 106
ADF pickup and feed system,
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As the document passes the contact image scanner, the scanner illuminates the document. The optical scanning system captures and amplifies the reflected light and converts it to a digital signal, and then sends the digital signal to the formatter for image-processing. Figure 4-9. HP LaserJet 3015 optical and feed systems 1 Optical scanning system 2 ADF pickup and feed system ADF pickup and feed system The ADF pickup and feed system uses a pickup roller, a feed roller, and a delivery roller to transport the document into, through, and out of the optical scanning system. The optical scanning system motor drives the rollers when the formatter signals the optical scanning system that a job to print or copy is present. There are two sensors along the ADF pickup and feed paper path. The document sensor (PS1201) detects the presence of a document in the ADF input tray. The document-top sensor (PS 1202) detects the document in the ADF paper path. The formatter processes the signals from the sensors and the product operates accordingly. 88 Chapter 4 Operational overview ENWW