Atr Control - Canon Color iR C3480 Service Manual

[1] Drum/ITB motor drive signal
[2] Photosensitive drum
[3] Primary charging roller
[4] Primary charging AC bias drive signal
[5] Internal data
[6] Drum count
[7] Drum film thickness detection data
MEMO:
The drum film thickness-related data stored in EEPROM may be either drum count or drum film thickness detection data, the drum film thickness count being
internal data and used when determining bias levels.

7.3.4 ATR Control

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 executes ATR control to supply toner so that the ratio between toner and carrier inside the drum unit may remain ideal.
1. timing for start-up
- When new drum unit is installed
- every print (video count)
- every 80-sheet (patch image reading sensor)
2. Particulars of Control
The machine computes the amount of toner to supply for each color, and supplies it to the drum unit.
The machine uses the following 2 types of data to compute toner amounts:
- Video Count (for each print)
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]
M1
[2]
Y
[3]
M
C
HVT1
D-CON
EEPROM
[6]
[5]
Y
M
C
BK
F-7-17
BK
[4]
[7]
Y
M
C
BK
Chapter 7
0013-8486
7-15