4. Sequence of Operations for Scanner Movement (page separation)I, II, and III in Figure 3-303 are all controlled by the microprocessor on the DC controller PCB with reference to the originalleading edge detection signal 1 (falling edge of SCDP1).The microprocessor determines the distance over which the scanner moves forward in relation to the reproduction ratio,original size, or the size of the selected cassette.I, II: The distance over which the scanner moves forward is determined in relation to the reproduction ratio and the originalsize or the size of the selected cassette.III: If original size detection is executed, the microprocessor assumes the value obtained by dividing the detected originalsize as the center and, therefore, as the leading edge of the second page.Control will be with reference to the size of the selected cassette for copying in page separation without detecting the sizeof the original.If II shown in Figure 3-303 exceeds 220 mm, 220 mm (approximate) will be used as the leading edge of the second page.If the order of making copies (first page and second page) is reversed in special features mode (Chapter 1), the operationswill be the same except that the order of SCFW2/SCRV2 and SCFW1/SCRV1 is reversed.Figure 3-303Original leading edge 1sensor (PS3)Scanner motor (M3)Scanning lamp (LA1)Scanner home positionsensor (PS1)INTR AER SCFW1 SCRV1 SCFW2 SCRV2 LSTRCopy Start key ONLeading edgeof 1st pageLeading edgeof 1 pageLeading edge of2nd page Forward ReverseI II IIICOPYRIGHT © 1997 CANON INC. CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 3 EXPOSURE SYSTEM3-9
