COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-115
3. OPERATION AND TIMING
The current to the LED is controlled so that the direct intensity (level of REF-S-K) is constant, thereby
maintaining the intensity of the LED at a specific value.
Figure 3-544
When the developer has been replaced upon installation or a sensor has been replaced, set the initial
values for the reflected light and the direct light in service mode. (See chapter 7. Troubleshooting Image
Problems.) Then, the following takes place after a copying run:
Figure 3-545
Detection of
direct light
Photosensitive
drum
Detection of
reflected light
LED
SGNL-S-K
LEDON*
REF-S-K
CPU
Toner
supply signal
Toner density signal
DC controller PCB
Q1
Corrects for dirt on the window.
During copying operation, the density is measured
with reference to video signals.
Computed based on the difference between
the reflected light and the initial value.
Various measurement data units may be checked
in service mode.
After copying operation, post rotation starts.
The transfer belt lowers.
A density pattern is formed
on the photosensitive drum.
LED turns ON.
The direct light signal and
the reflected light signal are read.
The light reflected by the
surface of the drum is read .
The toner density is
measured.
Initial values are set for the reflected light
and the direct light.
Performed when replacing the developer or sensors.
To prevent disrupting toner images.
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