COPYRIGHT © 1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
6-37
CHAPTER 6 IMAGE FORMATION SYSTEM
Each item of measurement data may be checked in service mode as follows:
Table6-405
Reference:
Unlike Y, M, or C toner, the copier’s black toner absorbs near infrared light. As such, the
amount of black toner inside the developer cannot be detected by shining near infrared light to
the developer.
The photosensitive drum, on the other hand, reflects near infrared light, and shining infrared
light to a black toner image on the photosensitive drum will enable detection of the
concentration of toner.
The density of a black toner image will decrease (lighter) as the amount of black toner inside
the developer decreases, and the degree of reflected light will increase.
Item
Description
Adjustment value
SGNL-K
Bk toner concentration signal (Bk-SGNL)
375±35
SGNL-D
614±21
REF-K
Bk reference signal (Bk-REF)
818±41
REF-D
818±41
Figure 6-405
BK-SGNL
BKLAON
BK-REF
LED
RAM
Photodiode for
generation of
reference signal
Photosensitive
drum
Re-
flecting
mirror
Photodiode for
measuring reflected light
DC driver PCB
SGNL initial value
REF initial value
Rate of
amplification
Содержание CLC 1120
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