Canon CLC 1120 Service Manual page 197

e. Flow of Control Using the Black Toner Concentration Sensor during Copying
Operation and Its Relate Detail Code
Flow at power-on
1. Starting (Copy Start key ON)
copying
operation
2. Checking the
connector
(disconnection)
3. Detecting dirt (during initial rotation)
on the
window
4. Forms a patch in the area
Forming a
coming face-to-face against
black patch
the linking plate of the
on the
transfer drum.
photosensitive
drum
5. Measuring The density of the patch is
concentration measured.
LED on; uses PS1 to check
5.1 Reading
REF-xx light; converts light into
voltage.
5.2 Making a Compares 'REF-xx' (initial
comparison setting) and 'REF-xx' read in
5.1.
and
computation
COPYRIGHT © 1999 CANON INC.
Flow of operation
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 IMAGE FORMATION SYSTEM
Detail code
xx00
The PS/PS2 connector is
disconnected.
xx80 The reading is 130 or higher.
xx81 The reading is 70 or lower.
xx91 The level of variation of one
sample is 102 or higher.
xxA1
The reading is 30% or more
lower than the initial setting
REF-xx.
xxB1 The reading is 30% or more
higher than the initial setting
REF-xx.
xx62 The initial setting is 777 or
lower.
xx72 The initial setting is 859 or
higher.
Item of detection
6-45