Canon 1130 Service Manual page 210

b. Gradation Sensors: Flow of Setting a Target and Related Detail Code (at time of auto
gradation correction)
(The notation "xx" in detail code indicates the color of developing assembly; xx=01:M,
xx=02:C,xx=03:Y)
Initial settings
1.Auto gradation
correction
2.Target value setting
2-1. Drum
rotation
2-2. Drum surface
detection
2-3. P-TRGT-Y/
M/C/K
reading
3.End
COPYRIGHT © 2002 CANON INC.
Flow of operation
Auto gradation correction is
executed in user mode.
(auto)
The photosensitive drum is
rotated.
The LED is turned on, and
the light reflected by the
surface of the photosensitive
drum is measured by the
sensor (PS); then, the
intensity of light is checked
by conversion into voltage.
On the surface of the
photosensitive drum, a
sample color toner image
(patch image) is created, and
the LED is turned on; then,
the sensor (PS) is used to
check the intensity of light
by voltage conversion,
ultimately setting P-TRGT.
(no need for adjustment)
Table6-412d
Photosensitive drum
Photo sensor (PS)
Figure6-412d
CANON CLC1100/1130/1150/1160/1180 REV.0 FEB. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 IMAGE FORMATION SYSTEM
Detail code
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Gradation sensor (PS73)
Items of detection
6-46e