Canon imagePRESS 1135 Series Service Manual page 100

2
Technology > Image Formation System > Various Types of Control > Image Stabilization Control
● Full Potential Control / Full D-max Control
In this control, the gird bias, E-V characteristics, laser power and the developing bias are
decided to correct the image density change due to the environment change or extended use
of the photosensitive drum.
Timing
1) At the time of multiple initial rotation(fixing temperature of lower than 50 degree C)
2) At the time of last rotation after 2000 prints
3) At the time of execution of PASCAL control
Related Error Code
• Potential control error.
E061-0001/0002/0003/0004/0005/0006
Related Service Mode
• Execution of the potential control.
COPIER > FUNCTION > DPC > DPC
• Execution of the offset adjustment of the potential control circuit.
COPIER > FUNCTION > DPC > OFST
Description
1. Determination of Grid bias (Vg)
Apply three levels of Vg (500V, 750V, and 900V), measure the Vd potential for each level
using the potential sensor, and determine the Vg so that the Vd potential at the developing
position becomes 500V.
Drum Surface (V)
Potential
Vd3
Vd2
500V
Vd1
2 Technology > Image Formation System > Various Types of Control > Image Stabilization Control
500V 750V 900V (V)
Vg (Grid Bias)
Grid Bias
F-2-69
2. Calculate the E-V (Exposure - Potential) characteristics
Apply four levels of laser power (Lp) (50h, 90h, C0h, and F0h) in the condition where the
determined Vg is applied, measure the VI potential (VI 1 to 4) for each level, and calculate
the E-V (Exposure - Potential) characteristics.
Drum Surface
Potential (V)
500V
Vl1
Vl potential
Vl2
Vl3
Vl4
50h 90h C0h
3. Patch image formation
Form a patch image to which 5 levels (±25V, 1±50V based on the value considered as a
target during potential control) of Lp and Vdc are applied to the ITB in the condition where
the Vg obtained by potential control is applied.
Drum Surface
Potential (V)
[1] [2] [3]
500V
Vd potential
E-V
characteristics
F0h Laser power
F-2-70
[4] [5]
Vd potential
Vdc (temporary value)
Vl (temporary value)
Laser power
F-2-71
2-52
2-52