4. Movement of the Scanner in Page Separation ModeFigure 3-303In Figure 3-303, all periods I, II, and III are controlled by the microprocessor on theDC controller PCB with reference to the original leading edge signal 1 (falling edge ofSCDP1) for the 1st page.The microprocessor determines the distance over which the scanner moves forwardbased on the selected reproduction ratio and the size of the original or selected cassette.I, II: The distance over which the scanner moves forward is determined based on theselected reproduction ratio and the size of the original or the cassette size.III: If original size detection has been executed, the microprocessor halves themeasured size and uses the result as the center of the original, and the scannermoves assuming it to be the leading edge of the 2nd page.If page separation is selected without original size detection, the control is based onthe size of the selected cassette.If the forward distance of II in Figure 3-303 is about 220 mm or more, the point about220 mm is assumed as the leading edge of the 2nd page.If the 1st and the 2nd pages are reversed using extended mode (Chapter 1), nochange will occur except that the order of SCFW2/SCRV2 and SCFW1/SCRV1 isreversed.Original leading edge 1sensor (PS3)Scanner motor (M3)Scanner home positionsensor (PS1)Scanning lamp (LA1)INTR AER SCFW1 SCRV1 SCFW2 SCRV2 LSTRCopy Start keyONLeading edgeof 1st pageLeading edgeof 1st pageLeading edgeof 2nd page FD RSI II IIICOPYRIGHT © 1997 CANON INC. CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 3 EXPOSURE SYSTEM3-9
