User Guide

CHAPTER 6 IMAGE FORMATION SYSTEM
6-44
COPYRIGHT © 1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
d. Flow of Control Using the Black Toner Concentration Sensor at Power-On and
Its Related Detail Code
figure 6-411
Flow at power-on
1. Turning on the
power switch
2. Detecting dirt on
window
2.1Reading SGNK-D
2.2Making a
comparison and
computation
Flow of operation
(during initial rotation)
Black tone sensor LED
on; uses PS1 and PS2 to
check light; converts
light into voltage.
Compares 'SGNK-D' and
'REF-D' effective at time
of initial setting and
'SGNK-D' and 'REF-D'
read in 2.1 to compute
the window soiling
correction value for the
black toner sensor.
Detail code
0465
0475
Item of detection
The level of soiling of the
window is 130 or higher.
The level of soiling of the
widow is 70 or less.
Photosensitive drum
Photosensor (PS1) Photosensor (PS2)
Black toner
concentration sensor