Canon FY8-13EX-000, NP6218 service manual Exposure System

CHAPTER 3 EXPOSURE SYSTEM

5.Scanner Operations in Page Separation Mode (non-AE, page separation, A4, 2 copies)

Figure 3-304

I, II, and III shown in Figure 3-108 are controlled by the microprocessor on the DC controller PCB with reference to the scanner home position signal (falling edge of SCHP) of the first original.

The microprocessor determines the distance to be traveled by the scanner according to the size of the selected cassette.

I, II: The distance traveled by the scanner is determined by the reproduction ratio and cassette size.

III:The copier does not have a mechanism that detects the size of originals; for this reason, control for page separation is exerted with reference to the size of the cassette.

If the distance traveled by the scanner forward (II in Figure 3-304) exceeds 216 mm (approx.), the copier assumes a point corresponding to 216 mm to be the leading edge of the second page.

The size of originals is checked only if an ADF (accessory) is installed.

The microprocessor identifies the result of dividing the identified size by 2 as the center of the original and operates the scanner assuming that the center represents the leading edge of the second original.

3-8 COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)