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The DC controller monitors the color misregistration sensors (PS12) during the foregoing
color misregistration control. There are two units of PS12 on the ITB, each having one light
emitter (LED) and one light receiver (PD).
The following is the sequence of this control.
1. The DC controller sends LED DRIVE signal (REGLED) and lets the LED emit light.
2. The light of the LED is reflected off the ITB and received by the PD on the sensor. The
light amounts received at the PD differ depending on whether or not the light is reflected
from the area the toner is on.
3. The light receiver converts the received light amount to voltage and sends it to the DC
controller in the form of the COLOR MISREGISTRATION DETECTION signal
(REGPDM).
4. The DC controller detects the positions of the detection patterns according to the time
the REGPDM signals vary.
Figure 5-54.
Color misregistration detection
The DC controller notifies the formatter of each error when the following errors are found
during color misregistration detection. The initial value is reset to the new color
misregistration adjustment value whenever an error occurs.
● Color misregistration sensor abnormality warning: No light is received at the light
receivers.
● Color misregistration measurement out of range warning: The measurement is found to
be out of specified range.
Image stabilization control
This controls the variation of the image density caused by an environmental change or
deterioration of the photosensitive drum, toner, etc.
ENWW Image formation system 177