Canon NP6085 Service Manual page 116

3. OPERATIONS AND TIMING
The density of an original is detected by measuring the five points shown in Figure 3-310 on the RDF
side and is communicated to the copier's DC controller PCB. The DC controller PCB uses the input to
determine the intensity of the scanning lamp for copying. The points of measurement differ between right
pick-up and left pick-up.
12 14.6
L1 9
L1: 32 mm (approx.; 1st page)
45 mm (approx.; 2nd and subsequent pages; LTR)
41 mm (2nd and subsequent pages; A4)
30 mm (2nd and subsequent pages; B5)
32 mm (2nd and subsequent pages; others)
RDF feeding direction
(a) Left Pick-Up
3-58
COPYRIGHT © 1996 CANON INC.
22.2
Figure 3-310 Points of Measurement on Originals
RDF feeding direction
(b) Right Pick-Up
CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
L2 L2 L2 L2 15~20mm
L2: 2.4 mm (1st page)
4.8 mm(2nd and subsequent pages)