Canon PC720 Service Manual - Page 76

MOPERATIONS AND TIMING IV. PICK-UP/FEEDING SYSTEM A. Outline The copier uses center reference feeding, in which copy paper is moved while centered along the pick-up/feeding path; the pick-up system consists of a single-cassette path or a multifeeder path. Copy paper from the cassette or the multifeeder is controlled by the registration roller so that it matches the leading edge of the image on the photosensitive drum; it is then moved to the transfer, separation, feeding, and fixing assemblies before it is discharged to the copy tray. The copier is equipped with three sensors to monitor the movement of copy paper. No. Name Remarks PS3 Delivery paper sensor Q751 Pre-registration roller paper sensor PS7 Singlefeeder paper sensor PC720/740 DC controller PCB 0 CC--opyti ( PS3 Fixing assembly Cassette Photosensitive drum Registration roller eliminator Q751 Figure 3-401a (PC720/740) PS7 Singlefeeder pick-up roller Cassette pick-up roller Holding plate 3 - 36 COPYRIGHT 1994 CANONINC. CANON PC7N740790/170 REV.OAUG.1994 PRINTEDIN JAPAN ompFumt AU JAPON)