Canon imageRUNNER ADVANCE C5500 Series Service Manual page 111

■ Registration Patch Sensor Adjustment
The correction of the Registration Patch Sensor light intensity and sampling of the ITB background are performed.
Configuration of the Registration Patch Sensor
The light produced by the LED is reflected from the patch image and detected by the light-receiving element.
There are two types of waves that are P wave (regular reflection) and S wave (diffuse reflection), and the light intensity is detected
by the light-receiving element.
P-wave
S-wave
Light intensity adjustment
The light intensity of the Patch Sensor is changed sequentially and adjusted such that the P wave output is the specified value.
Sampling of the ITB background
To prevent uneven reflection in the inner circumference of the ITB, the background of the whole circumference of the ITB is
sampled by the Patch Sensor without forming patches.
The patch image that is read is compared with the sampling results of the ITB background to read the density.
Related Error Code
Patch Sensor Error:
E029-1000
E029-1001
Registration Shutter Solenoid error:
E029-6001
Related Alarm Codes
Patch Sensor error:
10-0006: Patch Sensor error 1
10-0007: Patch Sensor error 2
10-0022: Patch detection light intensity abnormal change alarm
■ D-max Control
This machine corrects changes in the D-max value due to duration and environment variation, and controls to give stable laser
output over a long period of time.
Control description: Forms a density patch on the ITB and controls the contrast potential during image formation by reading that.
Feedback is performed to the charging DC, development DC, and laser power setting values accompanying the changes in
contrast potential.
Related Service Mode
Adjustment of the density target values of each color by D-max control:
(Level 2) COPIER > Adjust > DENS > DMAX-Y
*1. Deepest density
Registration Patch Sensor
LED
Diffused
reflection
*1
Light intensity
Monitor
Reflection
Half Mirror
97
2. Technology