Auto Gradation Control; Salt-Dmax Control (Development Characteristics Correction) - Canon iR C3200 Series Service Manual

Chapter 9

9.4.9 Auto Gradation Control

Outline
The auto gradation control mechanism is used to correct image gradation by correcting the laser output so as to obtain
ideal gradation characteristics.
Full Correction:
Quick Correction:
User Mode
The machine uses 2 types of auto gradation correction mechanisms, combining the best mechanisms to suit
individual requirements.
Description
9-22
Image density
Actual gradation characteristics
1.45
Ideal
characteristics
0
Relationship between laser output
and image density
F-9-19
T-9-27
The machine knows the actual gradation characteristics based on the 64-
gradation density data collected from the scanner.
The machine knows the actual gradation characteristics based on the 9-
gradation density data.
T-9-28
Full correction
Start up
|
v
SALT-Dmax control
(determines developing DC,
charging DC, primary current
levels)
|
v
255
Quick correction
Start up
|
v
SALT-Dmax control
(determines developing DC,
charging DC, and primary
transfer levels)
|
|
0000-4494