Canon imageRUNNER C1325 Series, Руководство по обслуживанию

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Technical Explanation > Image Formation System > Controls > Image Stabilization Control
Technical Explanation > Image Formation System > Controls > Image Stabilization Control
● PASCAL control
Gradation density characteristics on the image are stabilized.
This control is executed when the following is selected in UI menu: Auto Adjust Gradation >
Full Adjust. Gradation density of the patch pattern on the test print is scanned by the Reader
to create an image density correction table.
The foregoing table corrects image gradation density characteristics which change according
to the environment change and deterioration of the Photosensitive Drum.
Main Controller
(UN81)
1st
～
2nd Sheet
(Gradation
PASCAL)
PASCAL
1st Sheet
(D-max
PASCAL)
Standard data
for D-half
Standard data
for D-half
DC Controller
(UN04)
PG
Target
Density
ITB
PG
Target
density value
Vdc
Paper
LUT
PG
Reader
- 9 Patch
- 3 Screen x 4 color
Registration
Patch Sensor
Unit (Front) (Rear)
PG
Target
density value
- 3 Patch
- 3 Screen x 4 color
UN31,32
Registration
Patch Sensor
Unit (Front) (Rear)
UN31,32
Registration
Patch Sensor
Unit (Front) (Rear)
UN31,32
Control timing
When executing calibration (during execution of “Auto Gradation Adjustment > Full
Adjustment” in UI menu)
Control description
1) When the specified conditions are satisfied, the Main Controller PCB prints 3 types of
memorized test prints (patch pattern).
2) Place the test prints in the Reader.
3) Reader scans the gradation density of the patch pattern on the test print.
4) The Main Controller PCB creates an image gradation density correction table from the
gradation density data of patch pattern scanned by the Reader.
F-2-81
NOTE:
The following 3 types of patch patterns are formed with this control:
• A pattern for copy (39 patches for each color)
• A pattern for text (39 patches for each color)
• A pattern for photo (39 patches for each color)
Related service mode:
To set whether to display the modes for plain paper 3, recycled paper 3, heavy paper
1/2/3 on the Auto Adjust Gradation screen at the time of full adjustment.
COPIER > OPTION > DSPLY-SW > HPFL-DSP
0: OFF
1: Display plain paper 1,2/recycled paper 1,2 and plain paper 3/recycled paper 3
2: Display plain paper 1,2/recycled paper 1,2, plain paper 3/recycled paper 3, and
heavy paper 1,2,3
Patch image data
Reader
Printer
PASCAL control
F-2-82