Canon imageRUNNER C1335 Series Service Manual page 90

2
Technical Explanation > Image Formation System > Controls > Image Stabilization Control
The flow to calculate correction value for ARCDAT control
Reference data for
example)
ARCDAT of copy pattern
100
INT
40
20
10 40
100
Data output(D-CON)
2 Technical Explanation > Image Formation System > Controls > Image Stabilization Control
Start
Main Controller PCB (UN81)
Output of patch pattern data
DC Controller PCB (UN04)
Reference patch pattern for
ARCDAT is created (3Patch)
Registration Patch Sensor Unit
(Front,Rear)(UN31,UN32)
Patch scanning
DC Controller PCB (UN04)
Output of density data (INT)
Main Controller PCB (UN81)
Saved as reference
data for ARCDAT
F-2-86
● ARCDAT Control (Automatic and Reciprocal Color Density Adjustment
Technology)
While reducing downtime, the ideal gradation characteristics are realized.
Control timing
1) When replacing the Drum Unit
2) At paper interval on a specified print basis (80 sheets or more)
3) At last rotation on a specified print basis (30 sheets or more)
4) At last rotation of PASCAL control or D-half control
Control description
1) 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 patch pattern in each color (Y, M, C, and Bk) on the ITB.
(Total of 12 patterns: 3 patch patterns for each color)
3) The DC Controller PCB measures the patch pattern by the Patch Sensor Front (UN44) and
the Patch Sensor Rear (UN43) and the result is returned to the Main Controller PCB.
4) Main Controller PCB compares this measured data with the reference data for ARCDAT
control that has been backed up. The difference by comparison is reflected to the D-half
result as the offset value.
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