Auto Gradation Adjustment (Pascal) Control; Toner Supply Area - Canon imageRUNNER ADVANCE C3325 Series Service Manual

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Technical Explanation > Image Formation System > Controls > Toner Supply Area
● Auto Gradation Adjustment (PASCAL) Control
Purpose: To stabilize gradation density characteristics of the image
This control is executed when "Auto Adjust Gradation > Full Adjust" is selected in the Settings/
Registration menu. 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.
Control timing:
When Settings/Registration > Adjustment/Maintenance > Adjust Image Quality > Auto Adjust
Gradation > Full Adjust is being executed
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 on the reader.
3) The reader scans the gradation density of the patch pattern from the test prints.
4) The Main Controller PCB creates an image gradation density correction table from
the gradation density data of patch pattern scanned by the reader.
Related Service Mode:
COPIER > OPTION > DSPLY-SW > HPFL-DSP : Set hvy,prntr 1200dpi dedicated mod
dspl
0: Hide
1: Display plain paper/heavy paper
2: Display standard/printer 1200 dpi dedicated mode
3: Display standard (plain paper)/standard (heavy paper)/printer 1200 dpi dedicated
mode
Printer
PASCAL control
2 Technical Explanation > Image Formation System > Controls > Toner Supply Area
Reader
Patch image data
F-2-62

■ Toner Supply Area

● Parts / Drive Configuration
Toner is supplied from the Toner Container to the Developing Unit. The toner level in the
Toner Container is detected at the same time.
PS26,27,28,29
UN39,40,41,42
M10
[2]
Parts name
[1] Toner Feed Screw A
[2] Toner Feed Screw B
UN39 to 42 Bottle New/Old Detection Sensor
(Y/M/C/Bk)
PS26 to 29 Toner Supply Sensor (Y/M/C/Bk) Presence/absence of the Toner Bottle is detected.
UN21 to 24 Toner Density Sensor (Y/M/C/Bk) Toner/carrier ratio in the Developing Unit is detected.
M04/M05 Bottle Motor (YM)/(CK)
M10 Developing Motor
Related Error Code:
E021-0001/0002 : Developing Motor error
E021-0120 : Developing Screw rotation detection error (Y)
E021-0220 : Developing Screw rotation detection error (M)
E021-0320 : Developing Screw rotation detection error (C)
E021-0420 : Developing Screw rotation detection error (Bk)
M04
M05
[1]
UN21,22,23,24
Role
Toner is supplied to the Developing Unit.
Toner is supplied to the Developing Unit.
The state of the Toner Bottle is detected.
Rotation of the Toner Bottle is detected.
Toner Bottle is rotated.
The screw inside the Developing Unit is driven.
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T-2-34
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