Canon imageRUNNER ADVANCE C5255 Series Service Manual page 103

2
Technology > Image Formation System > Controls > Image stabilization control
● D-max control
This control determines optimal developing DC bias, primary charging DC bias, laser power
output.
Execution timing
1) When replacing a drum unit or developing assembly.
2) At every post-rotation after the total reaches 1000 prints.
3) Power ON (High temperature and humidity)and corrects the each color developing DC
bias, primary charging DC bias, laser power output to realize the target density.
Detection details
1) DC controller creates the patch pattern in corresponding color on the ITB.
2) DC Controller measures the patch density with the Patch Sensor (center) (UN49)
Photosensitive
drum
Developing
cylinder
Primary
charging roller
HVT1(UN16)
D-max control
2 Technology > Image Formation System > Controls > Image stabilization control
ITB
Patch sensor
(Center)
(UN49)
HVT2 Laser scanner
(UN17) unit 1/2
Patch image date
DC controller(UN1)
(Y)D-max correction table
Y10
Y3
Target
Y2
Y1
0
Vdc
F-2-93
Start
DC controller(UN1)
Patch pattern is created
Patch sensor(Center)(UN49)
Patch scanning
DC controller(UN1)
D-max correction table is created(Y,M,C,Bk)
DC controller(UN1)
Developing DC bias,
Primary charging DC bias,
Laser Power output is determined
2-65
F-2-94
2-65