Pascal Control - Canon imageRUNNER ADVANCE C5045 Series Service Manual

2

PASCAL control

This control stabilizes gradation density characteristics of the image
This control is executed when selecting ["Auto gradation correction" > "Full correction"] in
User Mode.
Density characteristics of the patch pattern made by test print is scanned by the reader to
create the image density correction table. Using this table corrects image gradation density
characteristics, which vary according to the environmental change or deterioration of
photosensitive drum.
Main Controller 2 DC Controller (UN1)
PASCAL
PG
1st Sheet
(D-maxPASCAL)
Vdc
PG
2nd～4th Sheet
(Gradation
PASCAL) LUT
PG
Standard data
PG
for D-half
Target
density value
Standard data
PG
for ARCDAT
Target
density value
Execution timing
When executing calibration (during execution of ["Auto gradation correction" > "Full
correction"] in User Mode)
Control description
1) When the specified conditions are satisfied, the main controller prints 4 types of memorized
test prints (patch pattern).
2) Set the test print on the reader.
3) The reader scans gradation density of patch pattern from the test prints.
4) Main controller 2 creates the image gradation density correction table from the gradation
density data scanned by the reader.
2
ITB
PS49
Target
Patch Sensor (Center)
Density
Reader
Reader
- 10 Patch
- 3 Screen x 4 color
PS49
Patch Sensor (Center)
- 3 Patch
- 3 Screen x 4 color
PS49
Patch Sensor (Center)
MEMO:
This control creates 4 types of patch patterns as follows:
•
Patch pattern for copy (64 patches for each color)
• Patch pattern for text (64 patches for each color)
•
Patch pattern for photo (64 patches for each color)
•
Patch pattern for D-max (64 patches for each color)
Printer
Paper
Paper
F-2-100 F-2-100
Reader
Patch image date
PASCAL control
F-2-101 F-2-101
2-62
2-62