Canon CiRC2550, Service Manual, Page: 239 / 774

Chapter 7
7-16
F-7-18
[1] Video data
[2] Result of detection by the patch image read sensor
UN16: patch image read sensor (also serves as color displacement sensor A)
This function may cause print jobs to be interrupted.
In the case of a 100 sheet print job, the job will be interrupted at 80 pages and the control will be implemented. When the control is finished, the remaining 20
sheets will be printed out in a print job.
ATR-Related Error Code:
- E020-001x: outside correction range (upper limit) error 1
At time of installation or during replacement of a drum unit, the patch density data of the color in question as determined by ATR control is outside the range of
correction (upper limit).
- E020-002x: outside correction range (lower limit) error 1
At time of installation or during replacement of a drum unit, the patch density data of the color in question as determined by ATR control is outside the range of
correction (lower limit).
- E020-010x: outside correction range (upper limit) error 2
At time of printing, the patch density data of the color in question as determined by ATR control is outside the range of correction (upper limit).
- E020-020x: outside correction range (lower limit) error 2
At time of printing, the patch density data of the color in question as determined by ATR control is outside the range of correction (lower limit).
Detail Code (rightmost 4 characters, the 1st representing the color in question)
0: Y
1: M
2: C
3: Bk
7.3.5 D-max Control
0013-8489
Color iR C3380G / Color iR C2880G / Color iR C3380i / Color iR C3380 / Color iR C2880i / Color iR C2880 / iR C3480 / iR C3480i / iR C3080 / iR C3080i / iR
C2550
The machine uses D-max control to limit changes in the image density possibly occurring as the result of deterioration of the photosensitive drum or toner. The
image density is corrected on the printer side.
This control consists of 2 types: color D-max and black D-max.
Color D-max is density correction of colors (Y, M, C), while black D-max is density correction of Bk.
The details of these control mechanisms are as follows:
D-CON
[2]
[1]
M-CON
UN16
ITB
Y
M
C
BK