High-voltage
power supply PCBs
Reader unit
D-max
D-half
Color displacement
correction control
Toner cartridge
Laser scanner unit
ITB unit
Color
displacement/density
sensor
Signal from color
displacement/density signal
Bias
Video signal
Auto-gradation
correction control
● Execution timing
The table below lists the execution timing and duration of each control.
No
.
Executiontiming Duration D-max D-half Color dis-
placement
correction
Remarks
1 Power-ON Approx.195sec-
onds
Yes Yes Yes Executed at initial rotation
2 Toner cartridge replacement Approx.195sec-
onds
Yes Yes Yes Executed at initial rotation
3 Environmentalchanges Approx.195sec-
onds
Yes Yes Yes Executed after job completionDe-
tected by the environment sensor
4 After the pre-defined counts
printed
Approx.195sec-
onds
Yes Yes Yes Executed after job completion
5 After the pre-defined time
elapsed
Approx.195sec-
onds
Yes Yes Yes Executed after job completion
6 Resumed from sleep (after 8
hours or more)
Approx.100sec-
onds
Yes Yes - Executed after job completion
upon resumed
7 Full correction Approx.100sec-
onds
Yes Yes - Executed by users
8 Quick correction Approx.100sec-
onds
Yes Yes -
9 Copy image correction Approx.100sec-
onds
Yes Yes -
● Image density correction control (D-max control)
This control is to stabilize the print image density.
The DC controller PCB triggers D-max control under the pre-defined conditions.
1. Measure the density detection patterns for each color on the ITB.
2. Technical Explanation
37
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