Timing Of Measurement - Canon 1130 Service Manual

3. Timing of Measurement

To enable gradation correction, the machine uses the gradation sensor: once every 4 images
(A4 or smaller) or once every 3 images (B4 or larger) at the following timing:
1. Forms a patch in the area coming face-to-face against the link plate along the trailing edge of
the image for copying on side B
2. Forms a patch in the area coming face-to-face against the link plate along the leading edge of
the image for copying on side A
Developer
Side of transfer drum
Image on photosensitive drum
Gradation sensor (PS73)
Measurement by Bk sensor
(PS72)
Measurement by color toner
sensor
The patch image deposited to correct gradation and the patch image deposited
to control the color toner concentration are different types of patches, and they
REF.
cannot be deposited at the same time.
If the paper is A4 or smaller, the timing of depositing these two types of patches
would take place at the same time once for every 100 copies; however, the
deposit for the color toner density control mechanism will be given priority.
COPYRIGHT © 2002 CANON INC.
INTR
Figure6-412b Using Side B
CANON CLC1100/1130/1150/1160/1180 REV.0 FEB. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 IMAGE FORMATION SYSTEM
COPY
M
B
M+10
B / A
6-46c