The machine uses the video data arriving from the main controller to compute the amount of toner consumed, and makes up for it by supplying the drum unit

with the same amount.

- Result of Detection by the Patch Image Read Sensor (to every 80-sheet *1)

The machine measures the toner image formed on the ITB using the patch image read sensor, and supplies the drum unit so that the density will be identical to

the target density.

*1: The condition of execution is based on printing an original with an image ratio of 25%.

[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

iR C3380i / iR C3380 / iR C2880i / iR C2880 / iR C3580 / iR C3580i / iR C3080 / iR C3080i

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:

ITB

UN16

[2]

D-CON

[1]

M-CON

F-7-18

Chapter 7