Color Registration Control (Color Shift Correction) System - Konica Minolta bizhub c650 Service Manual

8. Write section (PH section)
8.2.5

Color registration control (color shift correction) system

• In a tandem engine, each four different color has an independent image reproduction
process. Color shift may occur because of variations in part accuracy. The color registra-
tion control system automatically detects color shift and correct color shift in the main
and sub scanning directions.
• The color shift detection sequence proceeds as follows. A detection pattern each in the
main scanning direction is produced at the front and rear on the transfer belt. Each of
IDC registration sensor F and R at the front and rear reads the corresponding pattern.
The amount of color shift in the sub scanning direction is then calculated and stored in
memory. A detection pattern each in the sub scanning direction is next produced at the
front and rear on the transfer belt. Each of IDC registration sensor F and R at the front
and rear reads the corresponding pattern. The amount of color shift in the main scanning
direction is then calculated and stored in memory. Based on the data representing the
amounts of color shift, the machine calculates how much each of the different colors
should be corrected. The correction data is further stored in memory. Based on the data
stored in memory, the machine controls each dot during production of image outputs,
thereby correcting the color shift.
Detection pattern for sub
scanning direction
Transfer belt
36
Theory of Operation Ver. 8.0 Jun. 2008
Detection pattern for main
scanning direction
IDC registration sensor/R
(IDCS/R)
IDC registration sen-
sor/F (IDCS/F)
A00JT2C034DA
4038T2C007AA