CHAPTER 6 IMAGE FORMATION SYSTEM
6-38
COPYRIGHT © 2002 CANON INC. CANON CLC1100/1130/1150/1160/1180 REV.2 FEB. 2002 PRINTED IN JAPAN (IMPRIME AU JAPON)
When measuring the concentration of black toner during copying operation, it is necessary to
prerent adhesion of toner on the photosensitive drum to the transfer sheet. To prevent such a
problem, the CPU PCB controls the timing at which the laser is turned on so that the black toner
image will come face-to-face with the metal transfer sheet.
Figure 6-406
4. Detecting Dirt on the Window
The LED is turned on when the power switch is turned on or while control rotation (CNTR)
takes place during copying operation to measure PT-SIG-D without toner on the photosensitive
drum.
The level of PT-SIG-D is low if the sensor window is soiled. The ratio between the level of PT-
SIG-D and a predetermined value is stored in memory and used to correct the output of the sensor
while controlling the concentration of the toner inside the black developing assembly.
If the level of PT-SIG-D is ±30% or more of a predetermined level, the copier will indicate
‘E020’.
Figure 6-407
Transfer
drum
Photosensitive
drum
Laser exposure
Black toner
Gradation sensor*
*CLC1140/1160/1180 only
Developing cylinder
Transfer sheet fixing plate
Black toner concentration
sensor
Photosensitive drum
Dirt on sensor
Photodiode
LED
Содержание CLC 1130
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