Canon BJC6500 Service Manual - Page 92

Part 5: REFERENCE BJC-6500 1.2 Construction of the Paper Feed Unit The BJC-6500's paper feed unit is comprised of the paper pick-up unit, paper feed unit, and the paper eject unit. Its' construction is different from that of the BJC-6100, as explained below. a) Pick-up unit Pick-up Roller Paper Angled ASF Face Pick-up Guide Pick-up Separator Stacked Paper Plain Paper Feeding (paper selector lever-back) Envelope/Postcard Feeding (paper selector lever-forward) Figure 5-2 Paper Pick-up Unit The pick-up unit of this printer is comprised of the pick-up roller, pick-up guide, the angled ASF face, and two pick-up separators. The pick-up separators are connected to the paper selector lever, and depending on the position of the paper selector lever's setting, the pick-up separators can be raised or lowered. When paper is stacked in the ASF, in order to prevent misfeeding due to bending of the paper, the angled face of the ASF is used to hold the paper in the place. For print media such as plain paper, both corners of the media are held down by the pick-up separators, causing slight bending of the paper to separate the sheets, and the media is fed through to the paper feed rollers one sheet at a time. If the paper is a resilient type, such as envelopes and thick paper, it pushes the paper separator over, and due to the angled face of the ASF, is fed one sheet at a time. While this construction provides better feeding performance, if the paper selector lever is incorrectly positioned, misfeeding or multi-feeding can occur. For details, refer to Part 1: 2.2.2 Paper type/settings (Page1-4) 5-2