a. AE Mode (CMAE) on the Copier’s SideDuring AE rotation (AER), the scanner is moved forward for 120 mm with the scan-ning lamp on; the potential of the drum is then measured at four locations of the copy-board (Figure 4-107) when the scanner is moved in reverse, and the measurements aresent to the DC controller PCB.The DC controller PCB computes the average based on these surface potential mea-surements to determine the intensity of the scanner for copying.Figure 4-107b. AE Mode (RFAE) on the RDF SideThe RDF is equipped with an AE sensor in its original feeding path to measure thedensity of originals while they are being moved.The AE sensor is a reflecting type sensor in which two LEDs illuminate the originaland a photodiode measures the reflected light (Figure 4-108).AE sensor 1 (S7) is used for left pick-up, while AE sensor 2 (S33) is used for rightpick-up (Figure 4-108).Figure 4-108AE sensor (S7) AE sensor 2 (S33)4 3 2 130 30 30 30 mm120 mmCHAPTER 4 IMAGE FORMATION SYSTEM4-8 COPYRIGHT © 1997 CANON INC. CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
