Canon 1130 Service Manual page 211

CHAPTER 6 IMAGE FORMATION SYSTEM
c. Flow of Controlling the Gradation Sensor During Copying Operation and Related
Detail Code
(The notation "xx" in detail code indicates the color of developing assembly; xx=01:M,
xx=02:C,xx=03:Y)
Initial settings
1.Copying start
2.RAM check
3.Drum surface
detection
4.Path image
formation
5.Intensity
measurement
5-1. Intensity
reading
5-2. Comparison,
computation
6-46f
COPYRIGHT © 2002 CANON INC.
Flow of operation
(The Start key is pressed.)
The P-SENS-Y/M/C/K
readings stored in RAM are
read.
(during initial rotation)
Measure
DISPLAY>DENS>P-SENS-
P and then, sets the
following:
DISPLAY>DENS>P-
GRND-Y/M/C/K.
On the surface of the
photosensitive drum, a
sample color toner image
(patch image) is formed in
the area coming face-to-face
against the link plate of the
transfer drum.
The light reflected by the
patch image is measured.
The LED is tuned on, and
the sensor (PS) is used to
check the light reflected by
the image, thus measuring
the light intensity by voltage
conversion.
The target value (P-TRGT-
Y/M/C/K) and the readings
taken in 5-1 are compared.
Table6-412e
Photosensitive drum
Photo sensor (PS)
Figure6-412e
CANON CLC1100/1130/1150/1160/1180 REV.0 FEB. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
Detail code Items of detection
xx67 The P-SENS-Y/M/C/K
reading is 256 or lower.
xx77 The P-SENS-Y/M/C/K
reading is 800 or higher.
00A3 The P-SENS-P reading is 100
or lower, or 1023.
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Gradation sensor (PS73)