Canon imageRUNNER ADVANCE C3500 III Series Service Manual page 106

Control tim- Conditions for execution
ing
At job comple- At last rotation performed ev-
tion ery 50 accumulated images
At last rotation performed ev-
ery 500 accumulated images
(high temperature and high
humidity environment)
At last rotation performed ev-
ery 1000 accumulated im-
ages
At parts re- When replacing the Drum
placement Unit
When replacing the Develop-
ing Unit (when INISET-
Y/M/C/K/4C is executed in
service mode)
When the Set- When Auto Gradation Adjust-
tings/Registra- ment > Full Adjust is execu-
tion menu is ted
executed
When Auto Gradation Adjust-
ment > Quick Adjust is exe-
cuted
When Correct Shading is
executed
When Auto Correct Color
Mismatch is executed
■ Laser Power Correction (D-max) Control
Purpose
Determines the optimal laser output.
Control description
1. The Main Controller PCB forms the patch pattern of the target color on the ITB.
2. The DC Controller measures the patch density using the Registration Patch Sensor Unit (Front/Rear) (UN46/47) and
corrects the laser output for each color to get the target density.
■ D-half Control
Purpose
Optimal image gradation is determined.
Control description
1. The Main Controller PCB outputs patch data in each color (Y, M, C, and Bk) to the DC Controller PCB.
2. The DC Controller PCB forms a patch pattern of each color (Y/M/C/Bk) on the ITB from this data.
3. The DC Controller measures the patch pattern using the Registration Patch Sensor Unit (Front/Rear) (UN46/47) and
the result is sent to the Main Controller PCB.
4. Based on the data above, the Main Controller PCB executes gradation correction to obtain the ideal halftone image.
■ ARCDAT Control (Automatic and Reciprocal Color Density Adjustment
Technology)
Purpose
While reducing downtime, the ideal gradation characteristics are realized.
Laser power D-half con-
correction trol
control
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Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
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84
Type of control
ARCDAT Color dis-
control placement
correction
control
Yes -
Yes -
Yes -
Yes Yes
Yes -
Yes -
Yes -
Yes -
- Yes
2. Technology
Patch Sen- PASCAL
sor adjust- control
ment
- -
Yes -
Yes -
Yes -
Yes -
Yes Yes
Yes -
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