Image Stabilization Control - Minolta magicolor 7300 Service Manual

FrameMaker Ver.6E (PC) magicolor 7300 MECHANICAL/ELECTRICAL
02.08.08
4.

IMAGE STABILIZATION CONTROL

• Consistent image output can be achieved by adjusting the developing bias charge and
the laser intensity. In addition, registration correction control is performed to prevent color
shift.
4-1. Image Stabilization Control
• Image Stabilization Control is divided into 2 types, full correction control and simple cor-
rection control. Below is an explanation of each type of control.
Control name
Leak detection
1
control
2 AIDC intensity control
Maximum density
3
control
Color shift correction
4
control
Laser intensity
5
control
6 Gamma curve control
Simple correction
7
control
Full correction control is complete control 1 through 6.
Purpose
Set the optimum developing bias charge for the space
between the PC Drum and the Developing Roller to prevent
uneven density and leak images.
Adjusts the intensity of the LED light to ensure a constant
output value provided by the AIDC Sensor for a surface of
the Image Transfer Belt, to which no toner sticks, thereby
controlling variations in characteristics caused by time and
contamination.
Adjusts the pulse width ratio of the developing bias to keep
constant the amount of toner sticking to the surface of the
PC Drum for a 100% solid image.
The Registration Sensor detects the amount of color shift in
the main scanning and sub-scanning directions, and adjusts
laser emission timing.
Adjusts the intensity of the laser light to ensure constant line
and gradation reproduction with changes in characteristics
of the PC Drum, developing, and drum charging due to
environmental changes and durability issues.
Makes a gradation correction by producing a pattern on the
Image Transfer Belt, measuring the image density of the
pattern with the AIDC Sensor, and sending the
measurement results to the controller.
1 Complete execution of Control 1 through 6 is time
consuming and consumes more toner. Therefore, simple
correction is executed to reduce the amount of time required
and toner consumed.
In addition, if correction can not be completed by simple
correction, then full correction is executed.
M-6