D-Max Control - Canon imageRUNNER ADVANCE C5045 Series Service Manual

2

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
HVT2
HVT1(UN16)
(UN17)
D-max control
2
ITB
Patch sensor
(Center)
(UN49)
Laser scanner
unit 1/2
Patch image date
DC controller(UN1)
F-2-98 F-2-98
Patch pattern is created
(Y)D-max correction table
Y10
Y3 D-max correction table is created(Y,M,C,Bk)
Target
Y2
Y1
Developing DC bias,
0
Vdc
Primary charging DC bias,
Laser Power output is determined
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Start
DC controller(UN1)
Patch sensor(Center)(UN49)
Patch scanning
DC controller(UN1)
DC controller(UN1)
F-2-99 F-2-99
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